{"id":10006,"date":"2025-04-18T17:48:28","date_gmt":"2025-04-18T09:48:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/10006.html"},"modified":"2025-04-18T17:48:28","modified_gmt":"2025-04-18T09:48:28","slug":"%e3%80%90%e7%bd%91%e7%bb%9c%e3%80%91udp%e5%92%8ctcp%e4%b9%8b%e9%97%b4%e7%9a%84%e5%b7%ae%e5%88%ab%e5%92%8c%e5%9b%9e%e6%98%be%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/10006.html","title":{"rendered":"\u3010\u7f51\u7edc\u3011UDP\u548cTCP\u4e4b\u95f4\u7684\u5dee\u522b\u548c\u56de\u663e\u670d\u52a1\u5668"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>UDP \u548c TCP \u4e4b\u95f4\u7684\u5dee\u522b<\/li>\n<li>\n<ul>\n<li>\u6709\u8fde\u63a5\/\u65e0\u8fde\u63a5<\/li>\n<li>\u53ef\u9760\u4f20\u8f93\/\u4e0d\u53ef\u9760\u4f20\u8f93<\/li>\n<li>\u9762\u5411\u5b57\u8282\u6d41\/\u9762\u5411\u6570\u636e\u62a5<\/li>\n<li>\u5168\u53cc\u5de5\/\u534a\u53cc\u5de5<\/li>\n<\/ul>\n<\/li>\n<li>UDP\/TCP API \u7684\u4f7f\u7528<\/li>\n<li>\n<ul>\n<li>UDP API<\/li>\n<li>\n<ul>\n<li>DatagramSocket<\/li>\n<li>\n<ul>\n<li>\u6784\u9020\u65b9\u6cd5<\/li>\n<li>\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>DatagramPacket<\/li>\n<li>\n<ul>\n<li>\u6784\u9020\u65b9\u6cd5<\/li>\n<li>\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>\u56de\u663e\u670d\u52a1\u5668&#xff08;Echo Server&#xff09;<\/li>\n<li>\n<ul>\n<li>1. \u63a5\u6536\u8bf7\u6c42<\/li>\n<li>2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94<\/li>\n<li>3. \u5c06\u54cd\u5e94\u5199\u56de\u5ba2\u6237\u7aef<\/li>\n<li>\u5b8c\u6574\u4ee3\u7801<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<p>\u5b66\u4e60\u591a\u7ebf\u7a0b&#xff0c;\u6253\u7834\u4e86\u4ee5\u5f80\u5bf9\u4e8e\u7a0b\u5e8f\u7684\u8ba4\u77e5 \u5b66\u4e60\u7f51\u7edc\u7f16\u7a0b&#xff0c;\u5c06\u4f1a\u518d\u6b21\u6253\u7834\u5bf9\u4e8e\u7a0b\u5e8f\u7684\u8ba4\u77e5<\/p>\n<hr \/>\n<p>\u5957\u63a5\u5b57&#xff1a;Socket \u5355\u8bcd \u64cd\u4f5c\u7cfb\u7edf\u7ed9\u5e94\u7528\u7a0b\u5e8f&#xff08;\u4f20\u8f93\u5c42\u7ed9\u5e94\u7528\u5c42&#xff09;\u63d0\u4f9b\u7684 API&#xff0c;\u8d77\u4e86\u4e2a\u540d\u5b57&#xff0c;\u5c31\u53eb Socket API<\/p>\n<p>Socket \u672c\u8eab\u662f\u201c\u63d2\u69fd\u201d\u7684\u610f\u601d<\/p>\n<ul>\n<li>\u7535\u8111\u7684\u4e3b\u677f&#xff0c;\u63d2\u7740\u5404\u79cd\u5176\u4ed6\u7684\u786c\u4ef6<\/li>\n<\/ul>\n<hr \/>\n<p>\u63a5\u4e0b\u6765\u5b66\u4e60\u7684\u5c31\u662f\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684 Socket API&#xff08;Java \u7248\u672c\u7684&#xff09;<\/p>\n<h2>UDP \u548c TCP \u4e4b\u95f4\u7684\u5dee\u522b<\/h2>\n<p>socket API \u63d0\u4f9b\u4e86\u4e24\u7ec4\u4e0d\u540c\u7684 API&#xff0c;UDP \u6709\u4e00\u5957&#xff0c;TCP \u4e5f\u6709\u4e00\u5957<\/p>\n<hr \/>\n<p>TCP \u6709\u8fde\u63a5&#xff0c;\u53ef\u9760\u4f20\u8f93&#xff0c;\u9762\u5411\u5b57\u8282\u6d41&#xff0c;\u5168\u53cc\u5de5 UDP \u65e0\u8fde\u63a5&#xff0c;\u4e0d\u53ef\u9760\u4f20\u8f93&#xff0c;\u9762\u5411\u6570\u636e\u62a5&#xff0c;\u5168\u53cc\u5de5<\/p>\n<h3>\u6709\u8fde\u63a5\/\u65e0\u8fde\u63a5<\/h3>\n<p>\u6b64\u5904\u8c08\u5230\u7684\u8fde\u63a5&#xff0c;\u662f\u201c\u62bd\u8c61\u201d\u7684\u8fde\u63a5<\/p>\n<ul>\n<li>\u901a\u4fe1\u53cc\u65b9&#xff0c;\u5982\u679c\u4fdd\u5b58\u4e86\u901a\u4fe1\u5bf9\u7aef\u7684\u4fe1\u606f&#xff0c;\u5c31\u76f8\u5f53\u4e0e\u662f\u201c\u6709\u8fde\u63a5\u201d&#xff1b;\u5982\u679c\u4e0d\u4fdd\u5b58\u5bf9\u7aef\u7684\u4fe1\u606f&#xff0c;\u5c31\u662f\u201c\u65e0\u8fde\u63a5\u201d<\/li>\n<li>\u8fde\u63a5&#xff1a;\u901a\u4fe1\u53cc\u65b9 A \u4fdd\u5b58\u4e86 B \u7684\u4fe1\u606f&#xff08;IP \u548c\u7aef\u53e3\u53f7&#xff09;&#xff0c;B \u4e5f\u4fdd\u5b58\u4e86 A \u7684\u4fe1\u606f<\/li>\n<li>\u5982\u679c\u901a\u4fe1\u53cc\u65b9&#xff0c;\u5404\u81ea\u628a\u5bf9\u65b9\u7684\u4fe1\u606f\u5220\u9664\u6389&#xff0c;\u6b64\u65f6\u5c31\u76f8\u5f53\u4e0e\u201c\u65ad\u5f00\u4e86\u8fde\u63a5\u201d<\/li>\n<\/ul>\n<p>\u4e3e\u4e2a\u6817\u5b50&#xff1a;<\/p>\n<ul>\n<li>\u5c06\u6765\u4f60\u548c\u4f60\u7684\u53e6\u4e00\u534a\u53bb\u9886\u8bc1&#xff0c;\u7ed3\u5a5a\u8bc1\u4e0a\u5c31\u4f1a\u5199\u4e0a\u4e24\u4e2a\u4eba\u7684\u540d\u5b57&#xff0c;\u8d34\u4e0a\u7167\u7247\u3002\u4e00\u5f0f\u4e24\u4efd&#xff0c;\u4f60\u4fdd\u5b58\u4e00\u4efd&#xff0c;\u4f60\u7684\u53e6\u4e00\u534a\u4fdd\u5b58\u4e00\u4efd<\/li>\n<li>\u4f60\u7684\u672c\u4e0a\u4fdd\u7559\u4e86 ta \u7684\u4fe1\u606f&#xff0c;\u4f60\u7ffb\u5f00\u672c\u5c31\u80fd\u770b\u5230\u53e6\u4e00\u4e2a\u4eba\u662f ta<\/li>\n<li>ta \u7684\u672c\u4e0a\u4fdd\u7559\u4e86\u4f60\u7684\u4fe1\u606f&#xff0c;ta \u7ffb\u5f00\u672c\u5c31\u80fd\u770b\u5230\u53e6\u4e00\u4e2a\u4eba\u662f\u4f60<\/li>\n<li>\u6b64\u65f6\u4f60\u4eec\u4fe9\u5c31\u76f8\u5f53\u4e8e\u5efa\u7acb\u4e86\u201c\u62bd\u8c61\u7684\/\u903b\u8f91\u4e0a\u7684\u8fde\u63a5\u201d<\/li>\n<\/ul>\n<h3>\u53ef\u9760\u4f20\u8f93\/\u4e0d\u53ef\u9760\u4f20\u8f93<\/h3>\n<p>\u6b64\u5904\u8c08\u5230\u7684\u201c\u53ef\u9760\u201d&#xff0c;\u4e0d\u662f\u6307 100% \u80fd\u5230\u8fbe\u5bf9\u65b9&#xff0c;\u800c\u662f \u201c\u5c3d\u53ef\u80fd\u201d\u5230\u8fbe\u5bf9\u65b9<\/p>\n<ul>\n<li>\u56e0\u4e3a\u7f51\u7edc\u73af\u5883\u975e\u5e38\u590d\u6742&#xff0c;\u5b58\u5728\u5f88\u591a\u7684\u4e0d\u786e\u5b9a\u56e0\u7d20&#xff08;\u4f60\u518d\u5389\u5bb3\u7684\u6280\u672f&#xff0c;\u4e5f\u62b5\u4e0d\u8fc7\u6316\u6398\u673a\u4e00\u94f2\u5b50&#xff09; \u76f8\u5bf9\u6765\u8bf4&#xff0c;\u4e0d\u53ef\u9760\u5c31\u662f\u5b8c\u5168\u4e0d\u8003\u8651\u6570\u636e\u662f\u5426\u80fd\u5230\u8fbe\u5bf9\u65b9<\/li>\n<\/ul>\n<p>TCP \u5185\u7f6e\u4e86\u4e00\u4e9b\u673a\u5236&#xff0c;\u80fd\u591f\u4fdd\u8bc1\u53ef\u9760\u4f20\u8f93<\/p>\n<li>\u611f\u77e5\u5230\u5bf9\u65b9\u662f\u4e0d\u662f\u6536\u5230\u4e86<\/li>\n<li>\u91cd\u4f20\u673a\u5236&#xff0c;\u5728\u5bf9\u65b9\u6ca1\u6536\u5230\u7684\u65f6\u5019\u8fdb\u884c\u91cd\u8bd5<\/li>\n<p>UDP \u5219\u6ca1\u6709\u8fd9\u79cd\u53ef\u9760\u6027\u673a\u5236&#xff0c;\u5b8c\u5168\u4e0d\u7ba1\u53d1\u51fa\u53bb\u7684\u6570\u636e\u662f\u5426\u987a\u5229\u5230\u8fbe\u5bf9\u65b9<\/p>\n<hr \/>\n<p>\u76f4\u89c2\u611f\u89c9&#xff0c;\u53ef\u9760\u6bd4\u4e0d\u53ef\u9760\u4f20\u8f93\u66f4\u597d&#xff1f;<\/p>\n<ul>\n<li>\u4f46\u53ef\u9760\u4f20\u8f93\u8981\u4ed8\u51fa\u4ee3\u4ef7&#xff0c;TCP \u534f\u8bae\u8bbe\u8ba1\u5c31\u8981\u6bd4 UDP \u590d\u6742\u5f88\u591a&#xff0c;\u4e5f\u4f1a\u635f\u5931\u4e00\u4e9b\u4f20\u8f93\u6570\u636e\u7684\u6548\u7387<\/li>\n<\/ul>\n<hr \/>\n<h3>\u9762\u5411\u5b57\u8282\u6d41\/\u9762\u5411\u6570\u636e\u62a5<\/h3>\n<p>TCP \u662f\u9762\u5411\u5b57\u8282\u6d41\u7684&#xff0c;TCP \u7684\u4f20\u8f93\u8fc7\u7a0b\u5c31\u548c\u6587\u4ef6\u6d41\/\u6c34\u6d41\u662f\u4e00\u6837\u7684\u7279\u70b9<\/p>\n<ul>\n<li>\u4ece\u6587\u4ef6\u8bfb\u5199 100 \u4e2a\u5b57\u8282\n<li>\u4e00\u6b21\u8bfb\u5199 100 \u5b57\u8282<\/li>\n<li>\u4e24\u6b21&#xff0c;\u4e00\u6b21\u8bfb\u5199 50 \u5b57\u8282<\/li>\n<li>\u5341\u6b21&#xff0c;\u4e00\u6b21\u8bfb\u5199 10 \u5b57\u8282<\/li>\n<li>\u2026<\/li>\n<\/li>\n<li>TCP \u8bfb\u5199&#xff0c;\u548c\u6587\u4ef6\u8bfb\u5199\u662f\u4e00\u6478\u4e00\u6837\u7684<\/li>\n<\/ul>\n<p>UDP \u662f\u9762\u5411\u6570\u636e\u62a5\u7684&#xff0c;\u4f20\u8f93\u6570\u636e\u7684\u57fa\u672c\u5355\u4f4d\u4e0d\u662f\u5b57\u8282&#xff0c;\u800c\u662f\u201cUDP \u6570\u636e\u62a5\u201d<\/p>\n<ul>\n<li>\u4e00\u6b21\u53d1\u9001\/\u63a5\u6536&#xff0c;\u5fc5\u987b\u662f\u5b8c\u6574\u7684 UDP \u6570\u636e\u62a5<\/li>\n<\/ul>\n<hr \/>\n<p>\u8fd9\u4e9b\u5dee\u522b&#xff0c;\u4f1a\u76f4\u63a5\u5f71\u54cd\u5230\u4ee3\u7801\u7684\u5199\u6cd5<\/p>\n<h3>\u5168\u53cc\u5de5\/\u534a\u53cc\u5de5<\/h3>\n<p>\u5168\u53cc\u5de5&#xff1a;\u4e00\u4e2a\u901a\u4fe1\u94fe\u8def&#xff0c;\u53ef\u4ee5\u53d1\u9001\u6570\u636e&#xff0c;\u4e5f\u53ef\u4ee5\u63a5\u6536\u6570\u636e&#xff08;\u53cc\u5411\u901a\u4fe1&#xff09; \u534a\u53cc\u5de5&#xff1a;\u4e00\u4e2a\u901a\u4fe1\u94fe\u8def&#xff0c;\u53ea\u80fd\u53d1\u9001\/\u53ea\u80fd\u63a5\u6536&#xff08;\u5355\u5411\u901a\u4fe1&#xff09;<\/p>\n<p>\u6709\u4e00\u6839\u7f51\u7ebf&#xff0c;\u600e\u4e48\u8fdb\u884c\u53cc\u5411\u901a\u4fe1\u5462&#xff1f;<\/p>\n<ul>\n<li>\u5168\u53cc\u5de5\u8fd9\u4e2a\u4e8b\u60c5&#xff0c;\u7269\u7406\u5c42\u9762\u4e0a&#xff0c;\u5e76\u975e\u662f\u53ea\u6709\u4e00\u6839\u7ebf\u5728\u8fde\u63a5<\/li>\n<li>\u4e00\u6839\u7f51\u7ebf\u91cc&#xff0c;\u6709 8 \u6839\u94dc\u7ebf&#xff0c;\u5206\u6210 4 4 \u4e00\u7ec4&#xff08;\u56db\u6839\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c&#xff0c;\u53e6\u5916\u56db\u6839\u662f\u9632\u6b62\u610f\u5916\u60c5\u51b5\u53d1\u751f\u7684\u94dc\u7ebf\u5907\u4efd&#xff09;<\/li>\n<li>\u4e3b\u8981\u7684\u56db\u6839\u7ebf\u4e2d&#xff0c;\u4e24\u6839\u7ebf\u7528\u6765\u8d1f\u8d23\u53d1\u9001&#xff0c;\u4e24\u6839\u7528\u6765\u63a5\u6536<\/li>\n<\/ul>\n<h2>UDP\/TCP API \u7684\u4f7f\u7528<\/h2>\n<h3>UDP API<\/h3>\n<p>API \u5c31\u662f\u4e00\u7ec4\u51fd\u6570\/\u4e00\u7ec4\u7c7b<\/p>\n<h4>DatagramSocket<\/h4>\n<p>\u7f51\u5361\u7684\u9065\u63a7\u5668<\/p>\n<hr \/>\n<p>\u4ee3\u8868\u4e00\u4e2a Socket \u5bf9\u8c61<\/p>\n<ul>\n<li>\u5c5e\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u6982\u5ff5&#xff0c;Socket \u5c31\u53ef\u4ee5\u8ba4\u4e3a\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d&#xff0c;\u5e7f\u4e49\u7684\u6587\u4ef6\u91cc\u9762\u7684\u4e00\u79cd\u6587\u4ef6\u7c7b\u578b\n<ul>\n<li>\u8fd9\u6837\u7684\u6587\u4ef6&#xff0c;\u5c31\u662f\u7f51\u5361\/\u63a7\u5236\u53f0\/\u952e\u76d8\/\u663e\u5361\u2026\u8fd9\u79cd\u786c\u4ef6\u8bbe\u5907\u62bd\u8c61\u7684\u8868\u793a\u5f62\u5f0f\n<ul>\n<li>\u6240\u4ee5 Socket \u4e5f\u5177\u6709\u4e00\u4e9b\u6587\u4ef6\u7684\u7279\u6027&#xff0c;\u64cd\u4f5c\u6587\u4ef6\u9700\u8981\u5148\u6253\u5f00\u3001\u518d\u8bfb\u5199\u3001\u518d\u5173\u95ed\u3002Socket \u4e5f\u662f\u8fd9\u6837<\/li>\n<li>\u5305\u62ec\u521b\u5efa\u4e00\u4e2a Socket \u5bf9\u8c61&#xff0c;\u4e5f\u4f1a\u5360\u7528\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u91cc\u9762\u7684\u8d44\u6e90<\/li>\n<\/ul>\n<\/li>\n<li>\u5728\u8fd9\u91cc Socket \u5bf9\u8c61&#xff0c;\u5c31\u662f\u7f51\u5361\u7684\u4ee3\u8a00\u4eba\n<ul>\n<li>\u56e0\u4e3a\u6211\u4eec\u901a\u8fc7\u4ee3\u7801\u76f4\u63a5\u64cd\u4f5c\u7f51\u5361\u662f\u4e0d\u597d\u64cd\u4f5c\u7684<\/li>\n<li>\u7f51\u5361\u6709\u5f88\u591a\u79cd\u578b\u53f7&#xff0c;\u4e4b\u95f4\u63d0\u4f9b\u7684 API \u90fd\u4f1a\u6709\u5dee\u522b<\/li>\n<li>\u4e8e\u662f\u64cd\u4f5c\u7cfb\u7edf\u5c31\u628a\u7f51\u5361\u6982\u5ff5\u5c01\u88c5\u6210 Socket&#xff0c;\u5e94\u7528\u7a0b\u5e8f\u5458\u5c31\u4e0d\u9700\u8981\u5173\u6ce8\u786c\u4ef6\u7684\u5dee\u5f02\u548c\u7ec6\u8282&#xff0c;\u76f4\u63a5\u7edf\u4e00\u64cd\u4f5c Socket \u5bf9\u8c61\u5c31\u80fd\u95f4\u63a5\u7684\u64cd\u4f5c\u7f51\u5361\u4e86<\/li>\n<li>Socket \u5c31\u50cf\u4e07\u80fd\u9065\u63a7\u5668\u4e00\u6837<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h5>\u6784\u9020\u65b9\u6cd5<\/h5>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td><\/td>\n<td>DatagramSocket ()<\/td>\n<td>\u521b\u5efa\u2f00\u4e2a UDP \u6570\u636e\u62a5\u5957\u63a5\u5b57\u7684 Socket&#xff0c;\u7ed1\u5b9a\u5230\u672c\u673a\u4efb\u610f\u2f00\u4e2a\u968f\u673a\u7aef\u2f1d&#xff08;\u2f00\u822c\u2f64\u4e8e\u5ba2\u2f3e\u7aef&#xff09;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>DatagramSocket (int port)<\/td>\n<td>\u521b\u5efa\u2f00\u4e2a UDP \u6570\u636e\u62a5\u5957\u63a5\u5b57\u7684 Socket&#xff0c;\u7ed1\u5b9a\u5230\u672c\u673a\u6307\u5b9a\u7684\u7aef\u2f1d&#xff08;\u9700\u8981\u6307\u5b9a\u7aef\u53e3\u53f7&#xff0c;\u2f00\u822c\u2f64\u4e8e\u670d\u52a1\u7aef&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>\u65b9\u6cd5<\/h5>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td><\/td>\n<td>void receive (DatagramPacket p)<\/td>\n<td>\u4ece\u6b64\u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u62a5&#xff08;\u5982\u679c\u6ca1\u6709\u63a5\u6536\u5230\u6570\u636e\u62a5&#xff0c;\u8be5\u2f45\u6cd5\u4f1a\u963b\u585e\u7b49\u5f85&#xff09;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>void send (DatagramPacket p)<\/td>\n<td>\u4ece\u6b64\u5957\u63a5\u5b57\u53d1\u9001\u6570\u636e\u62a5\u5305&#xff08;\u4e0d\u4f1a\u963b\u585e\u7b49\u5f85&#xff0c;\u76f4\u63a5\u53d1\u9001&#xff09;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>void close ()<\/td>\n<td>\u5173\u95ed\u6b64\u6570\u636e\u62a5\u5957\u63a5\u5b57<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>DatagramPacket<\/h4>\n<p>UDP \u4f20\u8f93\u6570\u636e\u7684\u57fa\u672c\u5355\u4f4d<\/p>\n<hr \/>\n<p>\u4ee3\u8868\u4e00\u4e2a UDP \u6570\u636e\u62a5<\/p>\n<h5>\u6784\u9020\u65b9\u6cd5<\/h5>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td><\/td>\n<td>DatagramPacket(byte[] buf, int length)<\/td>\n<td>\u6784\u9020\u2f00\u4e2a DatagramPacket \u4ee5\u2f64\u6765\u63a5\u6536\u6570\u636e\u62a5&#xff0c;\u63a5\u6536\u7684\u6570\u636e\u4fdd\u5b58\u5728\u5b57\u8282\u6570\u7ec4&#xff08;\u7b2c\u2f00\u4e2a\u53c2\u6570 buf&#xff09;\u4e2d&#xff0c;\u63a5\u6536\u6307\u5b9a \u2ed3\u5ea6&#xff08;\u7b2c\u2f06\u4e2a\u53c2\u6570 length&#xff09;<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>DatagramPacket(byte[] buf, int offset, int length, SocketAddress address)<\/td>\n<td>\u6784\u9020\u2f00\u4e2a DatagramPacket \u4ee5\u2f64\u6765\u53d1\u9001\u6570\u636e\u62a5&#xff0c;\u53d1\u9001\u7684\u6570\u636e\u4e3a\u5b57\u8282\u6570\u7ec4&#xff08;\u7b2c\u2f00\u4e2a\u53c2\u6570 buf&#xff09;\u4e2d&#xff0c;\u4ece 0 \u5230\u6307\u5b9a\u2ed3 \u5ea6&#xff08;\u7b2c\u2f06\u4e2a\u53c2\u6570 length&#xff09;\u3002address \u6307\u5b9a\u2f6c\u7684\u4e3b\u673a\u7684 IP \u548c\u7aef\u2f1d\u53f7<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>\u65b9\u6cd5<\/h5>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td><\/td>\n<td>InetAddress getAddress()<\/td>\n<td>\u4ece\u63a5\u6536\u7684\u6570\u636e\u62a5\u4e2d&#xff0c;\u83b7\u53d6\u53d1\u9001\u7aef\u4e3b\u673a IP \u5730\u5740&#xff1b;\u6216\u4ece\u53d1\u9001\u7684\u6570\u636e\u62a5\u4e2d&#xff0c;\u83b7\u53d6\u63a5\u6536\u7aef\u4e3b\u673a IP \u5730\u5740<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>int getPort()<\/td>\n<td>\u4ece\u63a5\u6536\u7684\u6570\u636e\u62a5\u4e2d&#xff0c;\u83b7\u53d6\u53d1\u9001\u7aef\u4e3b\u673a\u7684\u7aef\u2f1d\u53f7&#xff1b;\u6216\u4ece\u53d1\u9001\u7684\u6570\u636e\u62a5\u4e2d&#xff0c;\u83b7\u53d6\u63a5\u6536\u7aef\u4e3b\u673a\u7aef\u53e3\u53f7<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>byte[] getData()<\/td>\n<td>\u83b7\u53d6\u6570\u636e\u62a5\u4e2d\u7684\u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u56de\u663e\u670d\u52a1\u5668&#xff08;Echo Server&#xff09;<\/h4>\n<p>\u6700\u7b80\u5355\u7684\u5ba2\u6237\u7aef\u670d\u52a1\u5668\u7a0b\u5e8f&#xff0c;\u4e0d\u6d89\u53ca\u5230\u4e1a\u52a1\u6d41\u7a0b&#xff0c;\u53ea\u662f\u5bf9\u4e0e API \u7684\u7528\u6cd5\u505a\u6f14\u793a<\/p>\n<p>\u5ba2\u6237\u7aef\u53d1\u9001\u4ec0\u4e48\u6837\u7684\u8bf7\u6c42&#xff0c;\u670d\u52a1\u5668\u5c31\u8fd4\u56de\u4ec0\u4e48\u6837\u7684\u54cd\u5e94&#xff0c;\u6ca1\u6709\u4efb\u4f55\u4e1a\u52a1\u903b\u8f91&#xff0c;\u6ca1\u6709\u8fdb\u884c\u4efb\u4f55\u8ba1\u7b97\u6216\u8005\u5904\u7406<\/p>\n<ul>\n<li>\u7f51\u7edc\u7f16\u7a0b\u5fc5\u987b\u8981\u4f7f\u7528\u7f51\u5361&#xff0c;\u5c31\u9700\u8981\u7528\u5230 Socket \u5bf9\u8c61\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a DatagramSocket \u5bf9\u8c61&#xff0c;\u4e4b\u540e\u5728\u57fa\u4e8e\u8fd9\u4e2a\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SocketException<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpEchoServer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">DatagramSocket<\/span> socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UdpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">SocketException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/SocketException \u5f02\u5e38\u662f IOException \u7684\u5b50\u7c7b<\/span><br \/>\n        socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u670d\u52a1\u5668\u8fd9\u4e00\u7aef\u6765\u8bf4&#xff0c;\u9700\u8981\u5728 socket \u5bf9\u8c61\u521b\u5efa\u7684\u65f6\u5019&#xff0c;\u5c31\u6307\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7 port&#xff0c;\u4f5c\u4e3a\u6784\u9020\u65b9\u6cd5\u7684\u53c2\u6570<\/li>\n<li>\u540e\u7eed\u670d\u52a1\u5668\u5f00\u59cb\u8fd0\u884c\u4e4b\u540e&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5c31\u4f1a\u628a\u7aef\u53e3\u53f7\u548c\u8be5\u8fdb\u7a0b\u5173\u8054\u8d77\u6765<\/li>\n<li>\u7aef\u53e3\u53f7\u7684\u4f5c\u7528\u5c31\u662f\u6765\u533a\u5206\u8fdb\u7a0b\u7684&#xff0c;\u4e00\u53f0\u4e3b\u673a\u4e0a\u53ef\u80fd\u6709\u5f88\u591a\u4e2a\u8fdb\u7a0b\u5f88\u591a\u4e2a\u7a0b\u5e8f&#xff0c;\u90fd\u8981\u53bb\u64cd\u4f5c\u7f51\u7edc\u3002\u5f53\u6211\u4eec\u6536\u5230\u6570\u636e\u7684\u65f6\u5019&#xff0c;\u54ea\u4e2a\u8fdb\u7a0b\u6765\u5904\u7406&#xff0c;\u5c31\u9700\u8981\u901a\u8fc7\u7aef\u53e3\u53f7\u53bb\u533a\u5206\n<ul>\n<li>\u6240\u4ee5\u5c31\u9700\u8981\u5728\u7a0b\u5e8f\u4e00\u542f\u52a8\u7684\u65f6\u5019&#xff0c;\u5c31\u628a\u8fd9\u4e2a\u7a0b\u5e8f\u5173\u8054\u54ea\u4e2a\u7aef\u53e3\u6307\u660e\u6e05\u695a<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<ul>\n<li>\u5728\u8c03\u7528\u8fd9\u4e2a\u6784\u9020\u65b9\u6cd5\u7684\u8fc7\u7a0b\u4e2d&#xff0c;JVM \u5c31\u4f1a\u8c03\u7528\u7cfb\u7edf\u7684 Socket API&#xff0c;\u5b8c\u6210\u201c\u7aef\u53e3\u53f7-\u8fdb\u7a0b\u201d\u4e4b\u95f4\u7684\u5173\u8054\u52a8\u4f5c\n<ul>\n<li>\u8fd9\u6837\u7684\u64cd\u4f5c\u4e5f\u53eb\u201c\u7ed1\u5b9a\u7aef\u53e3\u53f7\u201d&#xff08;\u7cfb\u7edf\u539f\u751f API \u540d\u5b57\u5c31\u53eb bind&#xff09;<\/li>\n<li>\u7ed1\u5b9a\u597d\u4e86\u7aef\u53e3\u53f7\u4e4b\u540e&#xff0c;\u5c31\u660e\u786e\u4e86\u7aef\u53e3\u53f7\u548c\u8fdb\u7a0b\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<ul>\n<li>\u5bf9\u4e8e\u4e00\u4e2a\u7cfb\u7edf\u6765\u8bf4&#xff0c;\u540c\u4e00\u65f6\u523b&#xff0c;\u4e00\u4e2a\u7aef\u53e3\u53f7\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u7ed1\u5b9a&#xff1b;\u4f46\u662f\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u7aef\u53e3\u53f7&#xff08;\u901a\u8fc7\u521b\u5efa\u591a\u4e2a Socket \u5bf9\u8c61\u6765\u5b8c\u6210&#xff09;\n<ul>\n<li>\u56e0\u4e3a\u7aef\u53e3\u53f7\u662f\u7528\u6765\u533a\u5206\u8fdb\u7a0b&#xff0c;\u6536\u5230\u6570\u636e\u4e4b\u540e&#xff0c;\u660e\u786e\u8bf4\u8fd9\u4e2a\u6570\u636e\u8981\u7ed9\u8c01&#xff0c;\u5982\u679c\u4e00\u4e2a\u7aef\u53e3\u53f7\u5bf9\u5e94\u5230\u591a\u4e2a\u8fdb\u7a0b&#xff0c;\u90a3\u4e48\u5c31\u96be\u4ee5\u8d77\u5230\u533a\u5206\u7684\u6548\u679c<\/li>\n<li>\u5982\u679c\u6709\u591a\u4e2a\u8fdb\u7a0b&#xff0c;\u5c1d\u8bd5\u7ed1\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7&#xff0c;\u53ea\u6709\u4e00\u4e2a\u80fd\u7ed1\u5b9a\u6210\u529f&#xff0c;\u540e\u6765\u7684\u90fd\u4f1a\u7ed1\u5b9a\u5931\u8d25<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>1. \u63a5\u6536\u8bf7\u6c42<\/h5>\n<ul>\n<li>\u901a\u8fc7 start \u6765\u542f\u52a8\u670d\u52a1\u5668\u7684\u6838\u5fc3\u6d41\u7a0b<\/li>\n<li>\u5bf9\u4e8e\u670d\u52a1\u5668\u6765\u8bf4&#xff0c;\u4e3b\u8981\u7684\u5de5\u4f5c&#xff0c;\u5c31\u662f\u4e0d\u505c\u5730\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8bf7\u6c42&#xff0c;\u56e0\u4e3a\u5ba2\u6237\u7aef\u4ec0\u4e48\u65f6\u5019\u4f1a\u53d1\u6765\u8bf7\u6c42\u662f\u672a\u77e5\u7684&#xff0c;\u6240\u4ee5\u8981\u65f6\u523b\u5f85\u547d<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790<\/span><br \/>\n    socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5bf9 7*24 \u5c0f\u65f6\u5de5\u4f5c\u7684\u670d\u52a1\u5668\u6765\u8bf4&#xff0c;\u670d\u52a1\u5668\u91cc\u9762\u6709\u6b7b\u5faa\u73af\u662f\u5f88\u6b63\u5e38\u7684&#xff0c;\u4e0d\u662f\u8bf4\u6b7b\u5faa\u73af\u5c31\u662f\u4ee3\u7801 bug<\/li>\n<\/ul>\n<li>\u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790\n<ul>\n<li>receive \u662f\u4ece\u7f51\u5361\u4e0a\u8bfb\u53d6\u6570\u636e&#xff0c;\u4f46\u662f\u8c03\u7528 receive \u7684\u65f6\u5019&#xff0c;\u7f51\u5361\u4e0a\u4e0d\u4e00\u5b9a\u5c31\u6709\u6570\u636e<\/li>\n<li>\u5f53\u8c03\u7528 start \u65b9\u6cd5\u4e4b\u540e\u7a0b\u5e8f\u542f\u52a8&#xff0c;\u5c31\u7acb\u523b\u8c03\u7528\u4e86 receive&#xff0c;\u4e00\u8c03\u7528 receive&#xff0c;\u5c31\u4f1a\u7acb\u523b\u4ece\u7f51\u5361\u4e2d\u8bfb\u53d6\u6570\u636e&#xff0c;\u4f46\u8fd9\u4e2a\u65f6\u5019\u5ba2\u6237\u7aef\u53ef\u80fd\u8fd8\u6ca1\u6765&#xff0c;\u7f51\u5361\u4e2d\u8fd8\u6ca1\u6709\u6570\u636e<\/li>\n<li>\u5982\u679c\u7f51\u5361\u4e0a\u6536\u5230\u6570\u636e\u4e86&#xff0c;receive \u7acb\u523b\u8fd4\u56de&#xff0c;\u83b7\u53d6\u6536\u5230\u7684\u6570\u636e&#xff1b;\u5982\u679c\u6ca1\u6709\u6536\u5230\u6570\u636e&#xff0c;receive \u5c31\u4f1a\u963b\u585e\u7b49\u5f85&#xff0c;\u76f4\u5230\u771f\u6b63\u6536\u5230\u6570\u636e\u4e3a\u6b62<\/li>\n<li>\u6b64\u5904 receive \u4e5f\u662f\u901a\u8fc7\u201c\u8f93\u51fa\u578b\u53c2\u6570\u201d\u83b7\u53d6\u5230\u7f51\u5361\u4e0a\u6536\u5230\u7684\u6570\u636e\u7684<\/li>\n<\/ul>\n<\/li>\n<ul>\n<li>receive \u7684\u53c2\u6570\u662f DatagramPacket\n<ul>\n<li>\u6211\u4eec\u5c31\u9700\u8981\u6784\u9020\u4e00\u4e2a\u7a7a\u7684 DatagramPacket \u5bf9\u8c61&#xff0c;\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9 receive<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790  <\/span><br \/>\n        <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\n<p>DatagramPacket \u81ea\u8eab\u9700\u8981\u5b58\u50a8\u6570\u636e&#xff0c;\u4f46\u662f\u6570\u636e\u7684\u7a7a\u95f4\u5177\u4f53\u591a\u5927&#xff0c;\u9700\u8981\u5916\u90e8\u6765\u5b9a\u4e49&#xff0c;\u81ea\u8eab\u4e0d\u8d1f\u8d23<\/p>\n<\/li>\n<li>\n<p>\u9700\u8981\u6307\u5b9a requestPacket \u6240\u9700\u8981\u5b58\u50a8\u6570\u636e\/\u6301\u6709\u6570\u636e\u7684\u57fa\u6570<\/p>\n<ul>\n<li>\u6307\u5b9a\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4&#xff0c;\u548c\u5176\u957f\u5ea6<\/li>\n<li>\u5927\u5c0f\u6ca1\u4ec0\u4e48\u8bb2\u7a76&#xff0c;\u53ea\u8981\u80fd\u786e\u4fdd\u80fd\u591f\u5b58\u50a8\u4e0b\u4f60\u901a\u8baf\u7684\u4e00\u4e2a\u6570\u636e\u5305\u5373\u53ef<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6536\u5230\u7684\u8bf7\u6c42\u6570\u636e\u662f\u901a\u8fc7\u4e8c\u8fdb\u5236 byte[] \u7684\u5f62\u5f0f\u6765\u4f53\u73b0\u7684&#xff0c;\u800c\u6211\u4eec\u540e\u7eed\u8981\u5c06\u5176\u8fdb\u884c\u5904\u7406&#xff0c;\u6700\u597d\u5c06\u5b83\u8f6c\u6210\u5b57\u7b26\u4e32\u624d\u597d\u5904\u7406<\/p>\n<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790  <\/span><br \/>\n        <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>    <span class=\"token comment\">\/\/\u5c06\u6536\u5230\u7684\u4e8c\u8fdb\u5236 byte[] \u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32  <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6784\u9020 String \u53ef\u4ee5\u57fa\u4e8e\u5b57\u8282\u6570\u7ec4\u6784\u9020&#xff0c;\u4e5f\u53ef\u4ee5\u57fa\u4e8e\u5b57\u7b26\u6570\u7ec4\u8fdb\u884c\u6784\u9020\n<ul>\n<li>\u6b64\u5904 DatagramPacket \u91cc\u9762\u6301\u6709\u7684\u5c31\u662f\u5b57\u8282\u6570\u7ec4&#xff0c;\u6211\u4eec\u5c31\u53d6\u51fa\u91cc\u9762\u5305\u542b\u7684\u5b57\u8282\u6570<\/li>\n<li>\u6b64\u5904\u5c31\u6307\u5b9a\u4e86&#xff1a;\u662f\u54ea\u4e2a\u5b57\u8282\u6570\u7ec4\u3001\u4ece\u54ea\u5f00\u59cb\u6784\u9020\u3001\u6784\u9020\u591a\u957f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94<\/h5>\n<ul>\n<li>\u8bf7\u6c42&#xff08;request&#xff09;&#xff1a;\u5ba2\u6237\u7aef\u4e3b\u52a8\u7ed9\u670d\u52a1\u5668\u53d1\u8d77\u7684\u6570\u636e<\/li>\n<li>\u54cd\u5e94&#xff08;response&#xff09;&#xff1a;\u670d\u52a1\u5668\u7ed9\u5ba2\u6237\u7aef\u8fd4\u56de\u7684\u6570\u636e<\/li>\n<\/ul>\n<p>\u6b64\u5904\u662f\u4e00\u4e2a\u56de\u663e\u670d\u52a1\u5668&#xff0c;\u54cd\u5e94\u5c31\u662f\u8bf7\u6c42<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790  <\/span><br \/>\n        <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5c06\u6536\u5230\u7684\u4e8c\u8fdb\u5236 byte[] \u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32  <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>        <span class=\"token comment\">\/\/2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94  <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>  <\/p>\n<p><span class=\"token comment\">\/\/\u8bf7\u6c42\u662f\u4ec0\u4e48&#xff0c;\u54cd\u5e94\u5c31\u662f\u4ec0\u4e48  <\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. \u5c06\u54cd\u5e94\u5199\u56de\u5ba2\u6237\u7aef<\/h5>\n<p>\u6b64\u65f6\u9700\u8981\u4e3b\u52a8\u7684\u5c06\u6570\u636e\u901a\u8fc7\u7f51\u5361\u53d1\u9001\u56de\u5ba2\u6237\u7aef<\/p>\n<ul>\n<li>\u4e0e receive \u76f8\u4f3c&#xff0c; send \u7684\u53c2\u6570\u662f DatagramPacket\n<ul>\n<li>\u6211\u4eec\u5c31\u9700\u8981\u6784\u9020\u4e00\u4e2a DatagramPacket \u5bf9\u8c61&#xff0c;\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9 send<\/li>\n<li>\u4f46\u6b64\u65f6\u4e0d\u80fd\u4f7f\u7528\u7a7a\u7684\u6570\u7ec4\u6765\u6784\u9020 DatagramPacket \u5bf9\u8c61<\/li>\n<li>\u9700\u8981\u4f7f\u7528\u521a\u521a\u7684 response \u6570\u636e\u8fdb\u884c\u6784\u9020<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790  <\/span><br \/>\n        <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5c06\u6536\u5230\u7684\u4e8c\u8fdb\u5236 byte[] \u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32  <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>        <span class=\"token comment\">\/\/2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94  <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>        <span class=\"token comment\">\/\/3. \u628a\u54cd\u5e94\u5199\u56de\u5230\u5ba2\u6237\u7aef  <\/span><br \/>\n        <span class=\"token class-name\">DatagramPacket<\/span> responsePacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">,<\/span><br \/>\n                requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSocketAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>responsePacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>  <\/p>\n<p><span class=\"token comment\">\/\/\u8bf7\u6c42\u662f\u4ec0\u4e48&#xff0c;\u54cd\u5e94\u5c31\u662f\u4ec0\u4e48  <\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>String \u53ef\u4ee5\u57fa\u4e8e\u5b57\u8282\u6570\u7ec4\u6765\u6784\u9020&#xff0c;\u4e5f\u53ef\u4ee5\u968f\u65f6\u53d6\u51fa\u91cc\u9762\u7684\u5b57\u8282\u6570\u7ec4<\/li>\n<li>response.getBytes().length \u4e0d\u80fd\u5199\u6210 response.length\n<ul>\n<li>\u524d\u8005\u662f\u5728\u83b7\u53d6\u5b57\u8282\u6570\u7ec4&#xff0c;\u5f97\u5230\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6&#xff0c;\u5355\u4f4d\u662f\u201c\u5b57\u8282\u201d<\/li>\n<li>\u540e\u8005\u662f\u5728\u83b7\u53d6\u5b57\u7b26\u4e32\u4e2d\u5b57\u7b26\u7684\u4e2a\u6570&#xff0c;\u5355\u4f4d\u662f\u201c\u5b57\u7b26\u201d<\/li>\n<\/ul>\n<\/li>\n<li>UDP \u6709\u4e00\u4e2a\u7279\u70b9\u2014\u2014\u65e0\u8fde\u63a5\n<ul>\n<li>\u6240\u8c13\u7684\u8fde\u63a5&#xff0c;\u5c31\u662f\u901a\u4fe1\u53cc\u65b9\u4fdd\u5b58\u5bf9\u65b9\u7684\u4fe1\u606f&#xff08;IP&#043;\u7aef\u53e3\u53f7&#xff09;<\/li>\n<li>\u5c31\u662f\u8bf4 DatagramSocket \u8fd9\u4e2a\u5bf9\u8c61\u4e2d&#xff0c;\u4e0d\u6301\u6709\u5bf9\u65b9&#xff08;\u5ba2\u6237\u7aef&#xff09;\u548c IP \u7aef\u53e3\u7684&#xff0c;\u8fdb\u884c send \u7684\u65f6\u5019&#xff0c;\u5c31\u9700\u8981\u5728 send \u7684\u6570\u636e\u5305\u91cc&#xff0c;\u628a\u8981\u201c\u53d1\u7ed9\u8c01\u201d\u8fd9\u6837\u7684\u4fe1\u606f&#xff0c;\u5199\u8fdb\u53bb&#xff0c;\u624d\u80fd\u591f\u6b63\u786e\u7684\u628a\u6570\u636e\u8fdb\u884c\u8fd4\u56de<\/li>\n<li>\u6240\u4ee5\u8981\u5c06\u4fe1\u606f\u4e5f\u4f5c\u4e3a\u53c2\u6570&#xff0c;\u4f20\u5165 responsePacket \u4e2d\n<ul>\n<li>\u5ba2\u6237\u7aef\u521a\u624d\u7ed9\u670d\u52a1\u5668\u53d1\u4e86\u4e00\u4e2a\u8bf7\u6c42 requestPacket&#xff0c;\u8fd9\u4e2a\u5305\u8bb0\u5f55\u4e86\u8fd9\u4e2a\u6570\u636e\u662f\u4ece\u54ea\u6765&#xff0c;\u4ece\u54ea\u6765\u5c31\u8ba9\u5b83\u56de\u54ea\u53bb&#xff0c;\u6240\u4ee5\u76f4\u63a5\u83b7\u53d6\u8fd9\u4e2a requestPacket \u7684\u4fe1\u606f\u5c31\u53ef\u4ee5\u4e86<\/li>\n<li>\u5ba2\u6237\u7aef\u7684 IP \u548c\u7aef\u53e3\u5c31\u90fd\u5305\u542b\u5728 requestPacket.getSocketAddress() \u4e2d<\/li>\n<li>\u540e\u7eed\u5f80\u5916\u53d1\u9001\u6570\u636e\u5305\u7684\u65f6\u5019&#xff0c;\u5c31\u77e5\u9053\u8be5\u53d1\u53bb\u54ea\u4e86 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418094827-68021feb5ccd9.png\" alt=\"image.png|390\" \/>&gt;- \u76f8\u6bd4\u4e4b\u4e0b&#xff0c;TCP \u4ee3\u7801\u4e2d&#xff0c;\u56e0\u4e3a TCP \u662f\u6709\u8fde\u63a5\u7684&#xff0c;\u5219\u65e0\u9700\u5173\u5fc3\u5bf9\u7aef\u7684 IP \u548c\u7aef\u53e3&#xff0c;\u53ea\u7ba1\u53d1\u9001\u6570\u636e\u5373\u53ef<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u91cc\u90fd\u662f\u82f1\u6587\u5b57\u6bcd\/\u963f\u62c9\u4f2f\u6570\u5b57\/\u82f1\u6587\u6807\u70b9\u7b26\u53f7\u7684\u8bdd&#xff0c;\u90fd\u662f ASCII \u7f16\u7801\u7684&#xff0c;\u4e00\u4e2a\u5b57\u7b26\u4e5f\u5c31\u662f\u4e00\u4e2a\u5b57\u8282\u8fd9\u4e48\u957f<\/li>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u91cc\u6709\u4e2d\u6587&#xff0c;\u662f UTF8 \u7f16\u7801\u7684&#xff0c;\u4e00\u4e2a\u4e2d\u6587\u5c31\u662f 3 \u4e2a\u5b57\u8282<\/li>\n<li>UTF8 \u4e5f\u662f\u80fd\u517c\u5bb9 ASCII&#xff0c;\u5f53\u4f7f\u7528 UTF8 \u8868\u793a\u82f1\u6587\u7684\u65f6\u5019&#xff0c;\u548c ASCII \u8868\u793a\u82f1\u6587\u662f\u5b8c\u5168\u76f8\u540c\u7684<\/li>\n<\/ul>\n<h5>\u5b8c\u6574\u4ee3\u7801<\/h5>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SocketException<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpEchoServer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">DatagramSocket<\/span> socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UdpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">SocketException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>  <\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u901a\u8fc7\u4e00\u4e2a\u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u8bf7\u6c42  <\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790  <\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5c06\u6536\u5230\u7684\u4e8c\u8fdb\u5236 byte[] \u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32  <\/span><br \/>\n            <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>            <span class=\"token comment\">\/\/2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94  <\/span><br \/>\n            <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>            <span class=\"token comment\">\/\/3. \u628a\u54cd\u5e94\u5199\u56de\u5230\u5ba2\u6237\u7aef  <\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> responsePacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">,<\/span><br \/>\n                    requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSocketAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>responsePacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <\/p>\n<p>            <span class=\"token comment\">\/\/4. \u6253\u5370\u65e5\u5fd7  <\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s:%d req&#061;%s, res&#061;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>request<span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>  <\/p>\n<p>    <span class=\"token comment\">\/\/\u8bf7\u6c42\u662f\u4ec0\u4e48&#xff0c;\u54cd\u5e94\u5c31\u662f\u4ec0\u4e48  <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>  <\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token 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