{"id":64169,"date":"2026-01-22T21:57:38","date_gmt":"2026-01-22T13:57:38","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64169.html"},"modified":"2026-01-22T21:57:38","modified_gmt":"2026-01-22T13:57:38","slug":"%e3%80%90java-%e5%bc%80%e5%8f%91%e6%97%a5%e8%ae%b0%e3%80%91%e6%88%91%e4%bb%ac%e6%9d%a5%e8%af%b4%e4%b8%80%e4%b8%8b-tcp-%e7%9a%84%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%e5%9b%9b%e6%ac%a1%e6%8c%a5%e6%89%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64169.html","title":{"rendered":"\u3010Java \u5f00\u53d1\u65e5\u8bb0\u3011\u6211\u4eec\u6765\u8bf4\u4e00\u4e0b TCP \u7684\u4e09\u6b21\u63e1\u624b\u56db\u6b21\u6325\u624b\u8fc7\u7a0b"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"a3ac3d2f-toc\" style=\"margin-left:80px\">\u7b2c\u4e00\u90e8\u5206&#xff1a;\u6838\u5fc3\u6982\u5ff5\u4e0e\u80cc\u666f<\/p>\n<p id=\"2a3c9f1a-toc\" style=\"margin-left:80px\">\u7b2c\u4e8c\u90e8\u5206&#xff1a;\u4e09\u6b21\u63e1\u624b \u2014 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id=\"uaff69ab7\">\u56db\u6b21\u6325\u624b\u7684\u76ee\u7684\u662f&#xff1a;\u53cc\u65b9\u90fd\u786e\u8ba4\u6ca1\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\u4e86&#xff0c;\u7136\u540e\u5b89\u5168\u5730\u5173\u95ed\u8fde\u63a5\u3002\u7531\u4e8e TCP \u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684&#xff08;\u53ef\u4ee5\u540c\u65f6\u72ec\u7acb\u5730\u8fdb\u884c\u53cc\u5411\u6570\u636e\u4f20\u8f93&#xff09;&#xff0c;\u56e0\u6b64\u6bcf\u4e2a\u65b9\u5411\u90fd\u5fc5\u987b\u5355\u72ec\u5173\u95ed\u3002<\/p>\n<p id=\"ua7337306\">\u5047\u8bbe\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u5173\u95ed\u3002<\/p>\n<p id=\"u1f5d66ef\">\u7b2c\u4e00\u6b65&#xff1a;\u7b2c\u4e00\u6b21\u6325\u624b&#xff08;Client -&gt; Server&#xff09;<\/p>\n<ul>\n<li id=\"u9a6984fd\">\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528 close() \u65b9\u6cd5&#xff0c;\u53d1\u9001\u4e00\u4e2a TCP \u62a5\u6587\u6bb5\u3002<\/li>\n<li id=\"ud10549c2\">\u8bbe\u7f6e\u6807\u5fd7\u4f4d FIN &#061; 1\u3002<\/li>\n<li id=\"ud515b610\">\u643a\u5e26\u4e00\u4e2a\u5f53\u524d\u7684\u5e8f\u5217\u53f7 seq &#061; u\u3002<\/li>\n<li id=\"u1cc40349\">\u5ba2\u6237\u7aef\u72b6\u6001&#xff1a;\u4ece ESTABLISHED \u8fdb\u5165 FIN-WAIT-1&#xff08;\u7ec8\u6b62\u7b49\u5f851&#xff09;\u3002<\/li>\n<\/ul>\n<p id=\"ufeedea26\">\u7b2c\u4e8c\u6b65&#xff1a;\u7b2c\u4e8c\u6b21\u6325\u624b&#xff08;Server -&gt; Client&#xff09;<\/p>\n<ul>\n<li id=\"u1a5c949d\">\u670d\u52a1\u5668\u6536\u5230 FIN \u62a5\u6587\u540e&#xff0c;\u7acb\u5373\u56de\u590d\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u3002<\/li>\n<li id=\"u328e090a\">\u8bbe\u7f6e\u6807\u5fd7\u4f4d ACK &#061; 1\u3002<\/li>\n<li id=\"uaeecab18\">\u786e\u8ba4\u53f7\u8bbe\u7f6e\u4e3a u &#043; 1\u3002<\/li>\n<li id=\"ubeef2f5d\">\u6b64\u65f6&#xff0c;\u4ece\u5ba2\u6237\u7aef\u5230\u670d\u52a1\u5668\u65b9\u5411\u7684\u8fde\u63a5\u5c31\u5173\u95ed\u4e86\u3002\u5ba2\u6237\u7aef\u4e0d\u4f1a\u518d\u5411\u670d\u52a1\u5668\u53d1\u9001\u6570\u636e&#xff0c;\u4f46\u670d\u52a1\u5668\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u8981\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u8fde\u63a5\u5904\u4e8e\u534a\u5173\u95ed\u72b6\u6001\u3002<\/li>\n<li id=\"ub4381fc4\">\u670d\u52a1\u5668\u72b6\u6001&#xff1a;\u4ece ESTABLISHED \u8fdb\u5165 CLOSE-WAIT&#xff08;\u5173\u95ed\u7b49\u5f85&#xff09;\u3002<\/li>\n<li id=\"udf5669c5\">\u5ba2\u6237\u7aef\u72b6\u6001&#xff1a;\u6536\u5230\u8fd9\u4e2a ACK \u540e&#xff0c;\u4ece FIN-WAIT-1 \u8fdb\u5165 FIN-WAIT-2&#xff08;\u7ec8\u6b62\u7b49\u5f852&#xff09;\u3002<\/li>\n<\/ul>\n<p id=\"ufc980e7b\">\u7b2c\u4e09\u6b65&#xff1a;\u7b2c\u4e09\u6b21\u6325\u624b&#xff08;Server -&gt; Client&#xff09;<\/p>\n<ul>\n<li id=\"u45e89928\">\u5f53\u670d\u52a1\u5668\u5c06\u5269\u4f59\u6570\u636e\u5168\u90e8\u53d1\u9001\u5b8c\u6bd5\u540e&#xff0c;\u5b83\u7684\u5e94\u7528\u7a0b\u5e8f\u4e5f\u4f1a\u8c03\u7528 close() \u65b9\u6cd5&#xff0c;\u53d1\u9001\u4e00\u4e2a FIN \u62a5\u6587\u3002<\/li>\n<li id=\"uf6e3452c\">\u8bbe\u7f6e\u6807\u5fd7\u4f4d FIN &#061; 1&#xff08;\u901a\u5e38\u8fd8\u4f1a\u540c\u65f6\u8bbe\u7f6e ACK &#061; 1&#xff09;\u3002<\/li>\n<li id=\"udf15b366\">\u643a\u5e26\u4e00\u4e2a\u5e8f\u5217\u53f7 seq &#061; w\u3002<\/li>\n<li id=\"udf1d787c\">\u670d\u52a1\u5668\u72b6\u6001&#xff1a;\u4ece CLOSE-WAIT \u8fdb\u5165 LAST-ACK&#xff08;\u6700\u540e\u786e\u8ba4&#xff09;\u3002<\/li>\n<\/ul>\n<p id=\"u7522da53\">\u7b2c\u56db\u6b65&#xff1a;\u7b2c\u56db\u6b21\u6325\u624b&#xff08;Client -&gt; Server&#xff09;<\/p>\n<ul>\n<li id=\"ue214da8b\">\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684 FIN \u62a5\u6587\u540e&#xff0c;\u5fc5\u987b\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u3002<\/li>\n<li id=\"ubb6747bd\">\u8bbe\u7f6e\u6807\u5fd7\u4f4d ACK &#061; 1\u3002<\/li>\n<li id=\"u2a077c74\">\u786e\u8ba4\u53f7\u8bbe\u7f6e\u4e3a w &#043; 1\u3002<\/li>\n<li id=\"u80ea9f7f\">\u5ba2\u6237\u7aef\u72b6\u6001&#xff1a;\u4ece FIN-WAIT-2 \u8fdb\u5165 TIME-WAIT&#xff08;\u65f6\u95f4\u7b49\u5f85&#xff09;\u3002\u6b64\u65f6\u5ba2\u6237\u7aef\u8fde\u63a5\u5c1a\u672a\u5b8c\u5168\u5173\u95ed&#xff0c;\u9700\u8981\u7b49\u5f85 2MSL&#xff08;\u4e24\u500d\u7684\u6700\u5927\u62a5\u6587\u6bb5\u751f\u5b58\u65f6\u95f4&#xff09;\u65f6\u957f\u3002<\/li>\n<li id=\"u8247f29f\">\u670d\u52a1\u5668\u6536\u5230\u8fd9\u4e2a ACK \u540e&#xff0c;\u72b6\u6001\u4ece LAST-ACK \u8fdb\u5165 CLOSED&#xff0c;\u8fde\u63a5\u6b63\u5f0f\u5173\u95ed\u3002<\/li>\n<\/ul>\n<p id=\"uca4ec0e3\">\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u9700\u8981 TIME-WAIT \u72b6\u6001&#xff1f;\u7b49\u5f85 2MSL \u7684\u76ee\u7684\u662f\u4ec0\u4e48&#xff1f;<\/p>\n<li id=\"u696a002c\">\u53ef\u9760\u5730\u7ec8\u6b62\u8fde\u63a5&#xff1a;\u786e\u4fdd\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6700\u540e\u4e00\u4e2a ACK \u80fd\u5230\u8fbe\u670d\u52a1\u5668\u3002\u5982\u679c\u8fd9\u4e2a ACK \u4e22\u5931&#xff0c;\u670d\u52a1\u5668\u4f1a\u8d85\u65f6\u91cd\u4f20 FIN \u62a5\u6587\u3002\u5ba2\u6237\u7aef\u5728 TIME-WAIT \u72b6\u6001\u4e0b\u53ef\u4ee5\u6536\u5230\u8fd9\u4e2a\u91cd\u4f20\u7684 FIN&#xff0c;\u5e76\u91cd\u53d1 ACK\u3002<\/li>\n<li id=\"ue2070d9d\">\u8ba9\u65e7\u7684\u91cd\u590d\u62a5\u6587\u5728\u7f51\u7edc\u4e2d\u6d88\u901d&#xff1a;\u7b49\u5f85 2MSL \u65f6\u95f4&#xff0c;\u8db3\u4ee5\u8ba9\u672c\u6b21\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u6240\u6709\u62a5\u6587\u90fd\u5728\u7f51\u7edc\u4e2d\u6d88\u5931\u3002\u8fd9\u6837&#xff0c;\u5c31\u4e0d\u4f1a\u5f71\u54cd\u540e\u7eed\u4f7f\u7528\u76f8\u540c\u56db\u5143\u7ec4&#xff08;\u6e90IP\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u7684IP\u3001\u76ee\u7684\u7aef\u53e3&#xff09;\u7684\u65b0\u8fde\u63a5\u3002<\/li>\n<h4 id=\"f0b9c32c\">\u603b\u7ed3\u4e0e\u5bf9\u6bd4<\/h4>\n<table id=\"MzUsg\">\n<tbody>\n<tr>\n<td>\n<p id=\"ub07738ac\">\u9636\u6bb5<\/p>\n<\/td>\n<td>\n<p id=\"u348bc350\">\u76ee\u7684<\/p>\n<\/td>\n<td>\n<p id=\"u0885037b\">\u5173\u952e\u6807\u5fd7\u4f4d<\/p>\n<\/td>\n<td>\n<p id=\"u077a02a9\">\u72b6\u6001\u53d8\u5316<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p id=\"ufd8b8527\">\u4e09\u6b21\u63e1\u624b<\/p>\n<\/td>\n<td>\n<p id=\"u804c1c29\">\u5efa\u7acb\u8fde\u63a5&#xff0c;\u540c\u6b65\u521d\u59cb\u5e8f\u5217\u53f7<\/p>\n<\/td>\n<td>\n<p id=\"uaf58e2cf\">SYN, ACK<\/p>\n<\/td>\n<td>\n<p id=\"u23cf1a5b\">CLOSED -&gt; SYN-SENT -&gt; SYN-RCVD -&gt; ESTABLISHED<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p id=\"u53947494\">\u7b2c\u4e00\u6b21\u6325\u624b<\/p>\n<\/td>\n<td>\n<p id=\"u2d753c2d\">\u5ba2\u6237\u7aef\u53d1\u8d77\u5173\u95ed&#xff08;\u5173\u95ed\u5df1\u65b9\u53d1\u9001\u901a\u9053&#xff09;<\/p>\n<\/td>\n<td>\n<p id=\"u8fb1e440\">FIN<\/p>\n<\/td>\n<td>\n<p id=\"ufb4a83ad\">ESTABLISHED -&gt; FIN-WAIT-1<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p id=\"ub97c0c13\">\u7b2c\u4e8c\u6b21\u6325\u624b<\/p>\n<\/td>\n<td>\n<p id=\"udcf4f117\">\u670d\u52a1\u5668\u786e\u8ba4\u6536\u5230\u5173\u95ed\u8bf7\u6c42<\/p>\n<\/td>\n<td>\n<p id=\"u36818a97\">ACK<\/p>\n<\/td>\n<td>\n<p id=\"uf4968c74\">ESTABLISHED -&gt; CLOSE-WAIT \/ FIN-WAIT-1 -&gt; FIN-WAIT-2<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p id=\"u5f8aa9de\">\u7b2c\u4e09\u6b21\u6325\u624b<\/p>\n<\/td>\n<td>\n<p id=\"ua5d822ec\">\u670d\u52a1\u5668\u53d1\u8d77\u5173\u95ed&#xff08;\u5173\u95ed\u5df1\u65b9\u53d1\u9001\u901a\u9053&#xff09;<\/p>\n<\/td>\n<td>\n<p id=\"u5ab55b4c\">FIN, ACK<\/p>\n<\/td>\n<td>\n<p id=\"u65d24a62\">CLOSE-WAIT -&gt; LAST-ACK<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p id=\"uc8a7fc84\">\u7b2c\u56db\u6b21\u6325\u624b<\/p>\n<\/td>\n<td>\n<p id=\"u020922b3\">\u5ba2\u6237\u7aef\u786e\u8ba4\u6536\u5230\u5173\u95ed\u8bf7\u6c42<\/p>\n<\/td>\n<td>\n<p id=\"ued206d41\">ACK<\/p>\n<\/td>\n<td>\n<p id=\"ua0dfeaa3\">FIN-WAIT-2 -&gt; TIME-WAIT -&gt; CLOSED<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4 id=\"FDVTV\">\u9762\u8bd5\u56de\u7b54<\/h4>\n<p id=\"ud91637bb\">\u4e09\u6b21\u63e1\u624b&#xff08;\u5efa\u7acb\u8fde\u63a5&#xff09;<\/p>\n<p id=\"u4dde25bf\">\u76ee\u7684&#xff1a;\u4e3a\u4e86\u786e\u8ba4\u53cc\u65b9\u7684\u53d1\u9001\u548c\u63a5\u6536\u80fd\u529b\u90fd\u6b63\u5e38&#xff0c;\u5e76\u540c\u6b65\u521d\u59cb\u5e8f\u5217\u53f7&#xff08;ISN&#xff09;\u3002<\/p>\n<li id=\"u79da2f89\">\u7b2c\u4e00\u6b21\u63e1\u624b&#xff08;SYN&#xff09;&#xff1a;\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2a SYN\u7684\u5305&#xff0c;\u5e76\u968f\u673a\u751f\u6210\u4e00\u4e2a\u521d\u59cb\u5e8f\u5217\u53f7 X \u7ed9\u670d\u52a1\u5668\u3002\u610f\u601d\u662f&#xff1a;\u201c\u6211\u60f3\u5efa\u7acb\u8fde\u63a5&#xff0c;\u8fd9\u662f\u6211\u7684\u8d77\u59cb\u53f7\u3002\u201d<\/li>\n<li id=\"u56f24fc9\">\u7b2c\u4e8c\u6b21\u63e1\u624b&#xff08;SYN&#043;ACK&#xff09;&#xff1a;\u670d\u52a1\u5668\u6536\u5230\u540e&#xff0c;\u5982\u679c\u540c\u610f\u8fde\u63a5&#xff0c;\u4f1a\u56de\u590d\u4e00\u4e2a SYN \u548c ACK\u7684\u5305\u3002\u5b83\u4f1a\u786e\u8ba4\u5ba2\u6237\u7aef\u7684\u5e8f\u5217\u53f7&#xff0c;\u540c\u65f6\u81ea\u5df1\u4e5f\u968f\u673a\u751f\u6210\u4e00\u4e2a\u521d\u59cb\u5e8f\u5217\u53f7 Y\u3002\u610f\u601d\u662f&#xff1a;\u201c\u6211\u6536\u5230\u4f60\u7684\u8bf7\u6c42\u4e86&#xff0c;\u6211\u540c\u610f\u8fde\u63a5\u3002\u8fd9\u662f\u6211\u7684\u8d77\u59cb\u53f7\u3002\u201d<\/li>\n<li id=\"u9b3d7a92\">\u7b2c\u4e09\u6b21\u63e1\u624b&#xff08;ACK&#xff09;&#xff1a;\u5ba2\u6237\u7aef\u6536\u5230\u56de\u590d\u540e&#xff0c;\u518d\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a ACK \u7684\u5305&#xff0c;\u786e\u8ba4\u670d\u52a1\u5668\u7684\u5e8f\u5217\u53f7\u3002\u610f\u601d\u662f&#xff1a;\u201c\u6536\u5230\u4f60\u7684\u540c\u610f\u4e86&#xff0c;\u8fde\u63a5\u5efa\u7acb\u6210\u529f\u3002\u201d \u81f3\u6b64&#xff0c;\u8fde\u63a5\u5efa\u7acb&#xff0c;\u53ef\u4ee5\u5f00\u59cb\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<p id=\"u2003e83f\">\u56db\u6b21\u6325\u624b&#xff08;\u65ad\u5f00\u8fde\u63a5&#xff09;<\/p>\n<p id=\"u3d2dc7cc\">\u76ee\u7684&#xff1a;\u53cc\u65b9\u90fd\u786e\u8ba4\u6570\u636e\u5df2\u53d1\u9001\u5b8c\u6bd5&#xff0c;\u53ef\u4ee5\u5b89\u5168\u5173\u95ed\u8fde\u63a5\u3002\u4e4b\u6240\u4ee5\u662f\u56db\u6b21&#xff0c;\u56e0\u4e3aTCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684&#xff0c;\u6bcf\u4e00\u65b9\u5411\u90fd\u9700\u8981\u72ec\u7acb\u5173\u95ed\u3002<\/p>\n<li id=\"u5fa81bea\">\u7b2c\u4e00\u6b21\u6325\u624b&#xff08;FIN&#xff09;&#xff1a;\u5047\u8bbe\u5ba2\u6237\u7aef\u6570\u636e\u53d1\u5b8c\u4e86&#xff0c;\u5b83\u4f1a\u53d1\u9001\u4e00\u4e2a FIN 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