![\"menu-r.4af5f7ec.gif\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812232004-689bcc24b646c.gif\")
<\/p>\n \u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90，\u70b9\u51fb\u83b7\u53d6 <\/p>\n
\u7b80\u4ecb：\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5229\u7528Java NIO（\u975e\u963b\u585e\u8f93\u5165\/\u8f93\u51fa）\u5b9e\u73b0\u9ad8\u6027\u80fd\u7684Socket\u670d\u52a1\u5668\u3002NIO\u901a\u8fc7\u63d0\u4f9b\u901a\u9053（Channel）\u3001\u7f13\u51b2\u533a（Buffer）\u548c\u9009\u62e9\u5668（Selector）\u7b49\u6838\u5fc3\u6982\u5ff5，\u652f\u6301\u9ad8\u5e76\u53d1\u7f51\u7edc\u5e94\u7528\u3002\u6587\u7ae0\u6db5\u76d6\u4e86\u521b\u5efaServerSocketChannel\u3001\u8bbe\u7f6e\u975e\u963b\u585e\u6a21\u5f0f\u3001\u6ce8\u518c\u9009\u62e9\u5668\u4ee5\u53ca\u5faa\u73af\u76d1\u542c\u548c\u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u5173\u952e\u6b65\u9aa4，\u5e2e\u52a9\u8bfb\u8005\u7406\u89e3\u5e76\u638c\u63e1NIO\u5728\u670d\u52a1\u5668\u7aef\u7f16\u7a0b\u4e2d\u7684\u5e94\u7528\u3002 ![\"\u91c7\u7528NIO\u5b9e\u73b0\u4e00\u4e2aSocket\u670d\u52a1\u5668\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812232004-689bcc24c16d2.png\")
<\/p>\n
Java NIO（New IO，Non-Blocking IO）\u662fJava\u63d0\u4f9b\u7684\u4e00\u5957\u975e\u963b\u585eIO\u7684API，\u5b83\u652f\u6301\u9762\u5411\u7f13\u51b2\u533a\u7684\u3001\u57fa\u4e8e\u901a\u9053\u7684IO\u64cd\u4f5c\u3002\u4e0e\u4f20\u7edf\u7684Java IO\u76f8\u6bd4，NIO\u7684\u5f15\u5165\u4e3aJava IO\u5e26\u6765\u4e86\u66f4\u591a\u7684\u529f\u80fd\u548c\u7075\u6d3b\u6027，\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u65f6\u3002 <\/p>\n
\u4f20\u7edf\u7684Java IO\u57fa\u4e8e\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41\u8fdb\u884c\u64cd\u4f5c，\u8fd9\u4e9b\u90fd\u662f\u963b\u585e\u5f0f\u7684，\u610f\u5473\u7740\u6bcf\u6b21\u8c03\u7528\u90fd\u5fc5\u987b\u7b49\u5f85\u6570\u636e\u51c6\u5907\u597d\u6216\u8005\u5b8c\u6210\u64cd\u4f5c\u540e\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u3002\u800cJava NIO\u662f\u57fa\u4e8e\u7f13\u51b2\u533aBuffer\u548c\u901a\u9053Channel\u8fdb\u884c\u6570\u636e\u7684\u8bfb\u5199\u64cd\u4f5c，\u652f\u6301\u4e86\u975e\u963b\u585e\u6a21\u5f0f，\u5373\u5728\u6570\u636e\u672a\u51c6\u5907\u597d\u65f6，\u4e0d\u4f1a\u5f71\u54cd\u7ebf\u7a0b\u7684\u7ee7\u7eed\u6267\u884c，\u8fd9\u5bf9\u4e8e\u9ad8\u5e76\u53d1\u573a\u666f\u5c24\u5176\u91cd\u8981\u3002 <\/p>\n
Java NIO\u4e3b\u8981\u6709\u4e09\u4e2a\u6838\u5fc3\u7ec4\u4ef6：Channel（\u901a\u9053）\u3001Buffer（\u7f13\u51b2\u533a）\u548cSelector（\u9009\u62e9\u5668）\u3002\u901a\u9053\u662f\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u7684\u8f7d\u4f53，\u7c7b\u4f3c\u4e8eIO\u6d41\u4e2d\u7684\u6d41，\u4f46\u662f\u5b83\u80fd\u591f\u8fdb\u884c\u975e\u963b\u585e\u8bfb\u5199，\u5e76\u652f\u6301\u5f02\u6b65\u64cd\u4f5c\u3002\u7f13\u51b2\u533a\u662f\u6570\u636e\u7684\u4e34\u65f6\u5b58\u50a8，\u6240\u6709NIO\u7684\u6570\u636e\u64cd\u4f5c\u90fd\u662f\u57fa\u4e8e\u7f13\u51b2\u533a\u8fdb\u884c\u7684\u3002\u9009\u62e9\u5668\u662fJava NIO\u4e2d\u5b9e\u73b0\u591a\u8def\u590d\u7528\u7684\u57fa\u7840，\u5141\u8bb8\u5355\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u68c0\u67e5\u4e00\u4e2a\u6216\u591a\u4e2aChannel\u7684\u72b6\u6001，\u770b\u770b\u5b83\u4eec\u662f\u5426\u6709I\/O\u64cd\u4f5c\u51c6\u5907\u5c31\u7eea，\u4ece\u800c\u5b9e\u73b0\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u6570\u636e\u6d41\u3002 <\/p>\n
Java NIO\u7684\u5f15\u5165\u4e3a\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u63d0\u4f9b\u4e86\u53ef\u80fd，\u5c24\u5176\u9002\u7528\u4e8e\u7f51\u7edc\u7f16\u7a0b\u548c\u9700\u8981\u5904\u7406\u5927\u6570\u91cf\u7ea7I\/O\u64cd\u4f5c\u7684\u5e94\u7528\u573a\u666f\u3002\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u4f7f\u7528\u8fd9\u4e9b\u7ec4\u4ef6\u6765\u6784\u5efa\u9ad8\u6548\u3001\u7075\u6d3b\u7684\u7f51\u7edc\u5e94\u7528\u3002 <\/p>\n
\u901a\u9053（Channel）\u662fJava NIO\u4e2d\u4e00\u4e2a\u6838\u5fc3\u7684\u6982\u5ff5，\u5b83\u4e0e\u4f20\u7edf\u7684IO\u6d41（Stream）\u76f8\u6bd4\u6709\u663e\u8457\u7684\u533a\u522b\u3002\u5728Java IO\u4e2d，\u6d41\u662f\u5355\u5411\u7684，\u4f8b\u5982\u4f7f\u7528 FileInputStream \u53ea\u80fd\u8fdb\u884c\u6570\u636e\u7684\u8bfb\u53d6，\u800c\u4f7f\u7528 FileOutputStream \u5219\u53ea\u80fd\u8fdb\u884c\u6570\u636e\u7684\u5199\u5165\u3002\u8fd9\u79cd\u8bbe\u8ba1\u610f\u5473\u7740\u5728\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u65f6\u9700\u8981\u521b\u5efa\u4e24\u4e2a\u6d41，\u4e00\u4e2a\u7528\u4e8e\u8bfb\u53d6，\u53e6\u4e00\u4e2a\u7528\u4e8e\u5199\u5165，\u8fd9\u65e0\u7591\u589e\u52a0\u4e86\u7cfb\u7edf\u7684\u590d\u6742\u6027\u3002 <\/p>\n
\u901a\u9053\u5219\u4e0d\u540c，\u901a\u9053\u662f\u53cc\u5411\u7684，\u4e5f\u5c31\u662f\u8bf4，\u5b83\u65e2\u53ef\u4ee5\u7528\u4e8e\u8bfb\u53d6\u6570\u636e，\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5199\u5165\u6570\u636e\u3002\u8fd9\u79cd\u8bbe\u8ba1\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u91cf\u548c\u63d0\u9ad8\u6267\u884c\u6548\u7387\u3002\u4f8b\u5982，\u5f53\u9700\u8981\u540c\u65f6\u8bfb\u5199\u6587\u4ef6\u65f6，\u901a\u9053\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u7cfb\u7edf\u8d44\u6e90\u7684\u6d88\u8017\u548c\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u901f\u7387\u3002 <\/p>\n
\u6b64\u5916，\u901a\u9053\u662f\u4e0e\u64cd\u4f5c\u7cfb\u7edf\u5e95\u5c42\u7684I\/O\u673a\u5236\u7d27\u5bc6\u76f8\u5173\u7684，\u5b83\u53ef\u4ee5\u5229\u7528\u7cfb\u7edf\u7684\u5e95\u5c42\u673a\u5236\u8fdb\u884c\u9ad8\u6548\u7684\u6570\u636e\u4f20\u8f93，\u8fd9\u5bf9\u4e8e\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u6027\u80fd\u975e\u5e38\u6709\u5e2e\u52a9\u3002\u800c\u5728\u4f20\u7edf\u7684Java IO\u4e2d，\u6027\u80fd\u5f80\u5f80\u53d7\u9650\u4e8eJVM\u7684\u5b9e\u73b0\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u5dee\u5f02\u3002 <\/p>\n
Java NIO\u63d0\u4f9b\u4e86\u591a\u79cd\u7c7b\u578b\u7684\u901a\u9053，\u4f46\u5b83\u4eec\u5404\u81ea\u6709\u7740\u4e0d\u540c\u7684\u7279\u70b9\u548c\u4f7f\u7528\u573a\u666f\u3002\u4e86\u89e3\u8fd9\u4e9b\u7279\u70b9\u5bf9\u4e8e\u9ad8\u6548\u5730\u4f7f\u7528\u901a\u9053\u81f3\u5173\u91cd\u8981\u3002 <\/p>\n
FileChannel : \u8fd9\u662f\u4e00\u4e2a\u8fde\u63a5\u5230\u6587\u4ef6\u7684\u901a\u9053，\u53ef\u4ee5\u7528\u4e8e\u8bfb\u53d6\u3001\u5199\u5165\u548c\u6620\u5c04\u6587\u4ef6\u5230\u5185\u5b58\u4e2d\u3002 FileChannel \u64cd\u4f5c\u901a\u5e38\u4e0e\u78c1\u76d8I\/O\u76f8\u5173\u8054，\u9002\u7528\u4e8e\u5bf9\u6587\u4ef6\u7684\u9ad8\u6027\u80fd\u8bfb\u5199\u64cd\u4f5c\u3002 <\/p>\n<\/li>\n
SocketChannel : \u7528\u4e8e\u7f51\u7edc\u5957\u63a5\u5b57\u901a\u4fe1，\u53ef\u4ee5\u5efa\u7acbTCP\u8fde\u63a5，\u4e3b\u8981\u5e94\u7528\u4e8e\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u7684\u901a\u4fe1\u3002 SocketChannel \u652f\u6301\u963b\u585e\u548c\u975e\u963b\u585e\u4e24\u79cd\u6a21\u5f0f\u3002 <\/p>\n<\/li>\n
ServerSocketChannel : \u4e0e SocketChannel \u76f8\u4f3c，\u4f46\u5b83\u4e3b\u8981\u7528\u4e8e\u670d\u52a1\u5668\u7aef\u3002\u5b83\u76d1\u542c\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u5e76\u53ef\u4ee5\u63a5\u53d7\u65b0\u7684 SocketChannel \u8fde\u63a5\u3002 <\/p>\n<\/li>\n
DatagramChannel : \u8fd9\u4e2a\u901a\u9053\u5141\u8bb8\u6211\u4eec\u5728UDP\u534f\u8bae\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u6570\u636e\u7684\u53d1\u9001\u548c\u63a5\u6536\u3002\u5b83\u9002\u7528\u4e8e\u7f51\u7edc\u7f16\u7a0b\u4e2d\u9700\u8981\u9762\u5411\u65e0\u8fde\u63a5\u7684\u6570\u636e\u4f20\u8f93\u573a\u666f\u3002 <\/p>\n<\/li>\n<\/ul>\n
\u6bcf\u79cd\u901a\u9053\u7c7b\u578b\u90fd\u63d0\u4f9b\u4e86\u7279\u5b9a\u7684API\u6765\u652f\u6301\u5176\u529f\u80fd，\u540c\u65f6NIO\u7684\u901a\u9053\u4e5f\u652f\u6301\u975e\u963b\u585e\u6a21\u5f0f，\u8fd9\u4e3a\u9ad8\u6027\u80fd\u7f51\u7edc\u670d\u52a1\u63d0\u4f9b\u4e86\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002 <\/p>\n
\u8981\u4f7f\u7528\u901a\u9053，\u9996\u5148\u9700\u8981\u521b\u5efa\u76f8\u5e94\u7684\u5b9e\u4f8b\u3002\u4e0d\u540c\u7684\u901a\u9053\u7c7b\u578b\u6709\u4e0d\u540c\u7684\u5b9e\u4f8b\u5316\u65b9\u6cd5\u3002\u4e0b\u9762\u662f FileChannel \u548c SocketChannel \u5b9e\u4f8b\u5316\u8fc7\u7a0b\u7684\u793a\u4f8b\u4ee3\u7801： <\/p>\n
import java.nio.ByteBuffer;
\nimport java.nio.channels.FileChannel;
\nimport java.nio.channels.SocketChannel;
\nimport java.nio.file.Paths;
\nimport java.nio.file.StandardOpenOption;
\nimport java.net.InetSocketAddress;<\/p>\n
public class ChannelCreation {
\n public static void main(String[] args) {
\n try {
\n \/\/ FileChannel \u7684\u521b\u5efa
\n FileChannel fileChannel = FileChannel.open(
\n Paths.get("example.txt"), StandardOpenOption.READ, StandardOpenOption.WRITE);
\n \/\/ SocketChannel \u7684\u521b\u5efa\u548c\u8fde\u63a5
\n SocketChannel socketChannel = SocketChannel.open();
\n socketChannel.connect(new InetSocketAddress("localhost", 8080));
\n \/\/ \u5728\u6b64\u4e4b\u540e\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u7684\u8bfb\u5199\u64cd\u4f5c
\n \/\/ …
\n fileChannel.close(); \/\/ \u5173\u95ed\u901a\u9053
\n socketChannel.close(); \/\/ \u5173\u95ed\u901a\u9053
\n } catch (Exception e) {
\n e.printStackTrace();
\n }
\n }
\n}<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d，\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a FileChannel \u7528\u4e8e\u64cd\u4f5c\u6587\u4ef6，\u4ee5\u53ca\u4e00\u4e2a SocketChannel \u7528\u4e8e\u7f51\u7edc\u901a\u4fe1\u3002\u521b\u5efa FileChannel \u65f6，\u6211\u4eec\u6307\u5b9a\u4e86\u6587\u4ef6\u8def\u5f84\u548c\u64cd\u4f5c\u6a21\u5f0f（\u5982\u8bfb\u5199\u6743\u9650）\u3002\u5bf9\u4e8e SocketChannel ，\u6211\u4eec\u9996\u5148\u901a\u8fc7 open \u65b9\u6cd5\u5f97\u5230\u4e00\u4e2a\u672a\u8fde\u63a5\u7684\u5b9e\u4f8b，\u7136\u540e\u901a\u8fc7 connect \u65b9\u6cd5\u8fde\u63a5\u5230\u8fdc\u7a0b\u670d\u52a1\u5668\u3002 <\/p>\n
\u901a\u9053\u4e4b\u95f4\u7684\u6570\u636e\u4f20\u8f93\u4e3b\u8981\u4f7f\u7528 transferFrom \u548c transferTo \u65b9\u6cd5\u3002\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u652f\u6301\u96f6\u62f7\u8d1d（zero-copy）\u4f20\u8f93，\u4e5f\u5c31\u662f\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u901a\u9053\u4e4b\u95f4\u76f4\u63a5\u4f20\u8f93\u6570\u636e，\u800c\u4e0d\u5fc5\u7ecf\u8fc7\u5e94\u7528\u7a0b\u5e8f\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u8fd9\u51cf\u5c11\u4e86\u6570\u636e\u590d\u5236\u7684\u6b21\u6570，\u663e\u8457\u63d0\u9ad8\u4e86\u4f20\u8f93\u6548\u7387\u3002 <\/p>\n
\u4ee5\u4e0b\u662f\u4f7f\u7528 transferFrom \u548c transferTo \u65b9\u6cd5\u7684\u793a\u4f8b\u4ee3\u7801： <\/p>\n
import java.nio.ByteBuffer;
\nimport java.nio.channels.FileChannel;
\nimport java.nio.file.Paths;
\nimport java.nio.file.StandardOpenOption;
\nimport java.net.SocketChannel;<\/p>\n
public class ChannelDataTransfer {
\n public static void main(String[] args) {
\n try {
\n \/\/ \u521b\u5efaFileChannel\u548cSocketChannel\u5b9e\u4f8b
\n FileChannel fileChannel = FileChannel.open(
\n Paths.get("example.txt"), StandardOpenOption.READ, StandardOpenOption.WRITE);
\n SocketChannel socketChannel = SocketChannel.open();
\n socketChannel.connect(new InetSocketAddress("localhost", 8080));
\n \/\/ \u4e3aSocketChannel\u5206\u914d\u7f13\u51b2\u533a
\n ByteBuffer buffer = ByteBuffer.allocate(1024);
\n \/\/ \u4eceSocketChannel\u8bfb\u53d6\u6570\u636e\u5230FileChannel
\n long bytesRead = socketChannel.read(buffer);
\n buffer.flip();
\n long bytesWritten = fileChannel.transferFrom(buffer, 0, buffer.limit());
\n \/\/ \u6216\u8005\u4eceFileChannel\u4f20\u8f93\u6570\u636e\u5230SocketChannel
\n buffer.clear();
\n long bytesTransferred = fileChannel.transferTo(0, fileChannel.size(), socketChannel);
\n \/\/ \u5173\u95ed\u901a\u9053
\n fileChannel.close();
\n socketChannel.close();
\n } catch (Exception e) {
\n e.printStackTrace();
\n }
\n }
\n}<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d，\u6211\u4eec\u9996\u5148\u901a\u8fc7 SocketChannel \u8bfb\u53d6\u6570\u636e\u5230\u7f13\u51b2\u533a，\u7136\u540e\u5c06\u7f13\u51b2\u533a\u7684\u5185\u5bb9\u4f20\u8f93\u5230 FileChannel \u3002\u53cd\u4e4b，\u4e5f\u53ef\u4ee5\u76f4\u63a5\u4ece FileChannel \u4f20\u8f93\u6570\u636e\u5230 SocketChannel \u3002\u4f7f\u7528 transferFrom \u548c transferTo \u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u6548\u7387，\u7279\u522b\u662f\u5f53\u6570\u636e\u4f20\u8f93\u6d89\u53ca\u5927\u91cf\u6570\u636e\u65f6\u3002 <\/p>\n
\u6548\u7387\u5206\u6790 ： \u4f7f\u7528 transferFrom \u548c transferTo \u8fdb\u884c\u6570\u636e\u4f20\u8f93\u65f6，\u6570\u636e\u76f4\u63a5\u5728\u5185\u6838\u7f13\u51b2\u533a\u4e4b\u95f4\u4f20\u8f93，\u4e0d\u4f1a\u8fdb\u5165\u7528\u6237\u7a7a\u95f4，\u56e0\u6b64\u51cf\u5c11\u4e86\u7cfb\u7edf\u8c03\u7528\u548c\u5185\u5b58\u590d\u5236\u7684\u5f00\u9500\u3002\u8fd9\u79cd\u65b9\u5f0f\u7279\u522b\u9002\u5408\u4e8e\u5728\u4e24\u4e2a\u6587\u4ef6\u6216\u7f51\u7edc\u8bbe\u5907\u4e4b\u95f4\u4f20\u8f93\u5927\u91cf\u6570\u636e，\u80fd\u591f\u6781\u5927\u63d0\u5347\u6027\u80fd\u3002 <\/p>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f，\u867d\u7136 transferFrom \u548c transferTo \u63d0\u4f9b\u4e86\u9ad8\u6548\u7684\u4f20\u8f93\u65b9\u5f0f，\u4f46\u5b83\u4eec\u7684\u4f7f\u7528\u4f9d\u8d56\u4e8e\u5e95\u5c42\u7cfb\u7edf\u7684\u652f\u6301\u3002\u5e76\u975e\u6240\u6709\u64cd\u4f5c\u7cfb\u7edf\u90fd\u5b8c\u5168\u5b9e\u73b0\u4e86\u8fd9\u4e9b\u65b9\u6cd5\u7684\u96f6\u62f7\u8d1d\u529f\u80fd，\u6240\u4ee5\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u9700\u8981\u5bf9\u7279\u5b9a\u7684\u8fd0\u884c\u73af\u5883\u8fdb\u884c\u6d4b\u8bd5\u548c\u9a8c\u8bc1\u3002 <\/p>\n
\u7f13\u51b2\u533a（Buffer）\u662fJava NIO\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u6982\u5ff5，\u5b83\u7528\u4e8e\u5728\u5185\u5b58\u4e2d\u4e34\u65f6\u4fdd\u5b58\u6570\u636e\u3002Buffer\u53ef\u4ee5\u770b\u4f5c\u662f\u4e00\u4e2a\u5bb9\u5668，\u6216\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6570\u7ec4，\u7528\u4e8e\u8bfb\u5199\u6570\u636e\u7684\u4e34\u65f6\u5b58\u50a8\u3002\u4f7f\u7528Buffer，\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5904\u7406\u7684\u6548\u7387，\u7279\u522b\u662f\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6，\u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u7684\u6d88\u8017\u548c\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u5ea6\u3002 <\/p>\n
\u7f13\u51b2\u533a\u7531\u4e09\u4e2a\u5c5e\u6027\u7ec4\u6210：\u5bb9\u91cf（capacity）\u3001\u754c\u9650（limit）\u548c\u4f4d\u7f6e（position）\u3002\u5bb9\u91cf\u662f\u6307\u7f13\u51b2\u533a\u4e2d\u53ef\u4ee5\u5bb9\u7eb3\u6570\u636e\u7684\u603b\u5927\u5c0f，\u754c\u9650\u662f\u6307\u7f13\u51b2\u533a\u4e2d\u53ef\u4ee5\u8bfb\u53d6\u6216\u5199\u5165\u6570\u636e\u7684\u4f4d\u7f6e\u8fb9\u754c，\u4f4d\u7f6e\u662f\u6307\u4e0b\u4e00\u4e2a\u53ef\u4ee5\u8bfb\u53d6\u6216\u5199\u5165\u6570\u636e\u7684\u4f4d\u7f6e\u3002\u6b64\u5916，\u7f13\u51b2\u533a\u8fd8\u6709\u4e00\u4e2a\u6807\u8bb0（mark），\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u4f4d\u7f6e，\u4ee5\u4fbf\u4e8e\u540e\u7eed\u91cd\u7f6e\u4f7f\u7528\u3002 <\/p>\n
\u6bcf\u4e2a\u7f13\u51b2\u533a\u5728\u521b\u5efa\u540e\u90fd\u6709\u4e00\u4e2a\u521d\u59cb\u72b6\u6001，\u4f8b\u5982\u4f4d\u7f6e\u4e3a0\u3001\u754c\u9650\u4e3a\u5bb9\u91cf\u503c\u3001\u6ca1\u6709\u6807\u8bb0\u3002\u7f13\u51b2\u533a\u4e00\u65e6\u88ab\u8bfb\u53d6\u6216\u5199\u5165，\u8fd9\u4e9b\u503c\u4f1a\u6839\u636e\u64cd\u4f5c\u81ea\u52a8\u66f4\u65b0\u3002 <\/p>\n
import java.nio.ByteBuffer;<\/p>\n
public class BufferExample {
\n public static void main(String[] args) {
\n ByteBuffer buffer = ByteBuffer.allocate(1024); \/\/ \u521b\u5efa\u4e00\u4e2a\u5bb9\u91cf\u4e3a1024\u7684ByteBuffer
\n System.out.println("Capacity: " + buffer.capacity()); \/\/ \u8f93\u51fa\u5bb9\u91cf
\n System.out.println("Limit: " + buffer.limit()); \/\/ \u8f93\u51fa\u754c\u9650
\n System.out.println("Position: " + buffer.position()); \/\/ \u8f93\u51fa\u4f4d\u7f6e
\n \/\/ \u5199\u5165\u6570\u636e\u5230Buffer\u4e2d
\n buffer.put("Hello Buffer".getBytes());
\n System.out.println("Position after write: " + buffer.position()); \/\/ \u8f93\u51fa\u5199\u5165\u540e\u7684\u72b6\u6001
\n \/\/ \u5207\u6362Buffer\u4ece\u5199\u5165\u6a21\u5f0f\u5230\u8bfb\u53d6\u6a21\u5f0f
\n buffer.flip();
\n System.out.println("Position after flip: " + buffer.position()); \/\/ \u8f93\u51fa\u6a21\u5f0f\u5207\u6362\u540e\u7684\u72b6\u6001
\n }
\n}<\/p>\n
Java NIO\u63d0\u4f9b\u4e86\u591a\u79cd\u7c7b\u578b\u7684Buffer，\u5305\u62ecByteBuffer\u3001CharBuffer\u3001ShortBuffer\u3001IntBuffer\u3001LongBuffer\u3001FloatBuffer\u548cDoubleBuffer\u3002\u8fd9\u4e9bBuffer\u7c7b\u578b\u90fd\u662f\u62bd\u8c61\u7c7bBuffer\u7684\u5177\u4f53\u5b9e\u73b0，\u7528\u4e8e\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u8bfb\u5199\u64cd\u4f5c\u3002 <\/p>\n
\u9009\u62e9\u5408\u9002\u7684Buffer\u7c7b\u578b\u53d6\u51b3\u4e8e\u5e94\u7528\u7a0b\u5e8f\u7684\u6570\u636e\u5904\u7406\u9700\u6c42\u3002\u4f8b\u5982，\u5982\u679c\u662f\u5904\u7406\u6587\u672c\u6570\u636e，\u90a3\u4e48\u4f7f\u7528CharBuffer\u53ef\u80fd\u66f4\u52a0\u65b9\u4fbf；\u5982\u679c\u662f\u5904\u7406\u4e8c\u8fdb\u5236\u6570\u636e，\u5219\u9002\u5408\u4f7f\u7528ByteBuffer\u3002 <\/p>\n
\u5206\u6563\/\u805a\u96c6IO\u662fNIO\u4e2d\u7684\u4e00\u79cd\u7279\u6b8a\u8bfb\u5199\u65b9\u5f0f，\u53ef\u4ee5\u540c\u65f6\u4ece\u591a\u4e2a\u7f13\u51b2\u533a\u8bfb\u53d6\u6570\u636e\u6216\u5c06\u6570\u636e\u5199\u5165\u591a\u4e2a\u7f13\u51b2\u533a\u3002\u8fd9\u79cd\u65b9\u5f0f\u5bf9\u4e8e\u8bfb\u5199\u591a\u4e2a\u6570\u636e\u6e90\u6216\u76ee\u6807\u975e\u5e38\u6709\u7528\u3002 <\/p>\n
import java.nio.ByteBuffer;
\nimport java.io.RandomAccessFile;
\nimport java.nio.channels.FileChannel;<\/p>\n
public class ScatteringAndGatheringExample {
\n public static void main(String[] args) throws Exception {
\n RandomAccessFile raf = new RandomAccessFile("example.txt", "rw");
\n FileChannel fc = raf.getChannel();<\/p>\n
ByteBuffer[] buffers = new ByteBuffer[3];
\n buffers[0] = ByteBuffer.allocate(10);
\n buffers[1] = ByteBuffer.allocate(10);
\n buffers[2] = ByteBuffer.allocate(10);<\/p>\n
fc.read(buffers); \/\/ \u5c06\u6570\u636e\u8bfb\u5165\u5230\u591a\u4e2aBuffer\u4e2d
\n \/\/ \u8f93\u51faBuffer\u4e2d\u7684\u6570\u636e
\n for (ByteBuffer buffer : buffers) {
\n buffer.flip();
\n System.out.println("Data: " + new String(buffer.array(), 0, buffer.limit()));
\n buffer.clear();
\n }
\n \/\/ \u5173\u95edChannel\u548cRandomAccessFile
\n fc.close();
\n raf.close();
\n }
\n}<\/p>\n
\u7f13\u51b2\u533a\u7684\u6807\u8bb0\u548c\u91cd\u7f6e\u673a\u5236\u5141\u8bb8\u5728\u8bfb\u53d6\u6216\u5199\u5165\u8fc7\u7a0b\u4e2d\u4e34\u65f6\u4fdd\u5b58\u4e00\u4e2a\u4f4d\u7f6e\u70b9，\u4e4b\u540e\u53ef\u4ee5\u5c06\u4f4d\u7f6e\u91cd\u7f6e\u5230\u6807\u8bb0\u7684\u4f4d\u7f6e，\u8fd9\u6837\u53ef\u4ee5\u91cd\u590d\u8bfb\u53d6\u6216\u5904\u7406\u6570\u636e\u3002 <\/p>\n
import java.nio.ByteBuffer;
\nimport java.nio.charset.StandardCharsets;<\/p>\n
public class BufferMarkResetExample {
\n public static void main(String[] args) {
\n ByteBuffer buffer = ByteBuffer.allocate(1024);
\n String data = "This is a test string";
\n buffer.put(data.getBytes(StandardCharsets.UTF_8));
\n buffer.flip();
\n while (buffer.hasRemaining()) {
\n System.out.print((char) buffer.get()); \/\/ \u8bfb\u53d6\u6570\u636e\u5e76\u8f93\u51fa
\n }
\n System.out.println("\\\\nResetting buffer…");
\n buffer.mark(); \/\/ \u6807\u8bb0\u5f53\u524d\u4f4d\u7f6e
\n while (buffer.hasRemaining()) {
\n System.out.print((char) buffer.get()); \/\/ \u518d\u6b21\u8bfb\u53d6\u5e76\u8f93\u51fa\u6570\u636e
\n }
\n buffer.reset(); \/\/ \u91cd\u7f6e\u4f4d\u7f6e\u5230\u6807\u8bb0\u7684\u5730\u65b9
\n buffer.get(); \/\/ \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282，\u56e0\u4e3a\u4e0a\u4e00\u6b21\u5faa\u73af\u5df2\u7ecf\u8bfb\u53d6\u5230\u4e86\u672b\u5c3e
\n System.out.println("\\\\nAfter reading a byte: " + (char) buffer.get()); \/\/ \u8f93\u51fa\u91cd\u7f6e\u540e\u518d\u6b21\u8bfb\u53d6\u7684\u6570\u636e
\n }
\n}<\/p>\n
\u7f13\u51b2\u533a\u7684\u9ad8\u7ea7\u64cd\u4f5c\u80fd\u591f\u8ba9\u5f00\u53d1\u8005\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u6570\u636e\u7684\u8bfb\u5199\u8fc7\u7a0b，\u6709\u6548\u63d0\u9ad8\u6570\u636e\u5904\u7406\u7684\u6548\u7387\u548c\u7075\u6d3b\u6027\u3002\u901a\u8fc7\u5206\u6563\/\u805a\u96c6IO\u548c\u6807\u8bb0\/\u91cd\u7f6e\u673a\u5236，\u53ef\u4ee5\u5b9e\u73b0\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\u903b\u8f91，\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\u5c24\u5176\u6709\u6548\u3002 <\/p>\n
\u9009\u62e9\u5668\u662fJava NIO\u4e2d\u5b9e\u73b0\u975e\u963b\u585eI\/O\u7684\u6838\u5fc3\u7ec4\u4ef6\u4e4b\u4e00\u3002\u5728\u672c\u7ae0\u8282\u4e2d，\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\u9009\u62e9\u5668\u7684\u5de5\u4f5c\u673a\u5236，\u5e76\u901a\u8fc7\u5b9e\u4f8b\u6f14\u793a\u5176\u5728\u591a\u8def\u590d\u7528\u5b9e\u8df5\u4e2d\u7684\u5e94\u7528\u3002 <\/p>\n
\u9009\u62e9\u5668\u662fJava NIO\u4e2d\u7684\u4e00\u4e2a\u7ec4\u4ef6，\u5b83\u80fd\u591f\u68c0\u6d4b\u4e00\u4e2a\u6216\u591a\u4e2a\u901a\u9053\u4e0a\u53d1\u751f\u7684\u4e8b\u4ef6，\u5e76\u4e14\u80fd\u591f\u5904\u7406\u591a\u4e2a\u4e8b\u4ef6\u800c\u4e0d\u9700\u8981\u4e3a\u6bcf\u4e2a\u5355\u72ec\u7684\u4e8b\u4ef6\u521b\u5efa\u7ebf\u7a0b\u3002\u9009\u62e9\u5668\u4f7f\u5f97\u5f00\u53d1\u9ad8\u6027\u80fd\u7f51\u7edc\u670d\u52a1\u5668\u7a0b\u5e8f\u53d8\u5f97\u7b80\u5355\u9ad8\u6548\u3002 <\/p>\n
\u5728\u4e86\u89e3\u7ed1\u5b9a\u8fc7\u7a0b\u524d，\u5148\u6765\u6f84\u6e05\u4e00\u4e0b\u9009\u62e9\u5668\u548c\u901a\u9053\u7684\u5173\u7cfb\u3002\u5728NIO\u4e2d，\u4e00\u4e2a\u9009\u62e9\u5668\u53ef\u4ee5\u7ba1\u7406\u591a\u4e2a\u901a\u9053\u3002\u8fd9\u4e9b\u901a\u9053\u5fc5\u987b\u662f\u975e\u963b\u585e\u6a21\u5f0f，\u4ee5\u4fbf\u5b83\u4eec\u53ef\u4ee5\u4e0e\u9009\u62e9\u5668\u4e00\u8d77\u4f7f\u7528\u3002\u800c\u7ed1\u5b9a\u8fc7\u7a0b\u5219\u6d89\u53ca\u5230\u5c06\u901a\u9053\u6ce8\u518c\u5230\u9009\u62e9\u5668\u4e0a，\u4ece\u800c\u4f7f\u901a\u9053\u53ef\u4ee5\u63a5\u6536\u4e8b\u4ef6\u901a\u77e5\u3002 <\/p>\n
\u5177\u4f53\u6765\u8bb2，\u5f53\u901a\u9053\u88ab\u6ce8\u518c\u5230\u9009\u62e9\u5668\u4e0a\u65f6，\u9700\u8981\u6307\u5b9a\u54ea\u4e9b\u4e8b\u4ef6\u7c7b\u578b\u611f\u5174\u8da3，\u5982\u53ef\u8bfb\u3001\u53ef\u5199\u3001\u8fde\u63a5\u6216\u5f02\u5e38\u7b49\u3002\u63a5\u4e0b\u6765，\u53ef\u4ee5\u901a\u8fc7 Selector \u7684 select() \u65b9\u6cd5\u963b\u585e\u7b49\u5f85\u8fd9\u4e9b\u4e8b\u4ef6\u53d1\u751f\u3002\u4e00\u65e6\u76f8\u5173\u4e8b\u4ef6\u53d1\u751f，\u9009\u62e9\u5668\u5c31\u4f1a\u5c06\u5b83\u4eec\u6807\u8bb0\u51fa\u6765，\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u901a\u8fc7\u540e\u7eed\u8c03\u7528 selectedKeys() \u65b9\u6cd5\u6765\u83b7\u53d6\u8fd9\u4e9b\u4e8b\u4ef6\u5e76\u8fdb\u884c\u5904\u7406\u3002 <\/p>\n
\u6ce8\u518c\u901a\u9053\u5230\u9009\u62e9\u5668\u7684\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b： <\/p>\n
Selector selector = Selector.open();
\nServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
\nserverSocketChannel.bind(new InetSocketAddress(port));
\nserverSocketChannel.configureBlocking(false); \/\/ \u5fc5\u987b\u662f\u975e\u963b\u585e\u6a21\u5f0f
\nSelectionKey key = serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);<\/p>\n
while (true) {
\n int readyChannels = selector.select();
\n if (readyChannels == 0) continue;<\/p>\n
Iterator<SelectionKey> keyIterator = selector.selectedKeys().iterator();
\n while (keyIterator.hasNext()) {
\n SelectionKey key = keyIterator.next();
\n \/\/ \u68c0\u67e5\u4e8b\u4ef6\u7c7b\u578b\u5e76\u4f5c\u51fa\u76f8\u5e94\u5904\u7406
\n \/\/ …<\/p>\n
keyIterator.remove(); \/\/ \u5fc5\u987b\u4ece\u96c6\u5408\u4e2d\u79fb\u9664
\n }
\n}<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d，\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u9009\u62e9\u5668\u5b9e\u4f8b，\u7136\u540e\u83b7\u53d6\u4e86\u4e00\u4e2a\u901a\u9053\u5b9e\u4f8b\u5e76\u5c06\u5176\u914d\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\u3002\u4e4b\u540e，\u6211\u4eec\u901a\u8fc7\u8c03\u7528\u901a\u9053\u7684 register() \u65b9\u6cd5\u5c06\u5b83\u6ce8\u518c\u5230\u9009\u62e9\u5668\u4e0a，\u5e76\u6307\u5b9a\u4e86\u6211\u4eec\u5173\u5fc3\u7684\u4e8b\u4ef6\u7c7b\u578b，\u8fd9\u91cc\u662f SelectionKey.OP_ACCEPT ，\u8868\u793a\u6211\u4eec\u5bf9\u63a5\u53d7\u65b0\u7684\u8fde\u63a5\u611f\u5174\u8da3\u3002 <\/p>\n
\u9009\u62e9\u5668\u4f1a\u7b49\u5f85\u4e8b\u4ef6，\u76f4\u5230\u81f3\u5c11\u4e00\u4e2a\u901a\u9053\u51c6\u5907\u597d\u4e8b\u4ef6\u3002\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6， select() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6574\u6570，\u8868\u793a\u6709\u591a\u5c11\u901a\u9053\u5df2\u7ecf\u5c31\u7eea\u3002\u901a\u8fc7\u8c03\u7528 selectedKeys() \u65b9\u6cd5，\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u5305\u542b SelectionKey \u5bf9\u8c61\u7684\u96c6\u5408，\u6bcf\u4e2a\u5bf9\u8c61\u4ee3\u8868\u4e00\u4e2a\u5df2\u7ecf\u5c31\u7eea\u7684\u901a\u9053\u3002\u6700\u540e，\u6211\u4eec\u904d\u5386\u8fd9\u4e9b SelectionKey \u5bf9\u8c61，\u5e76\u6839\u636e\u4e8b\u4ef6\u7c7b\u578b\u8fdb\u884c\u5904\u7406\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f，\u5728\u5904\u7406\u5b8c\u4e8b\u4ef6\u540e，\u5fc5\u987b\u4ece\u96c6\u5408\u4e2d\u79fb\u9664\u76f8\u5e94\u7684 SelectionKey \u5bf9\u8c61，\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u91cd\u590d\u5904\u7406\u540c\u4e00\u4e8b\u4ef6\u3002 <\/p>\n
\u5728\u591a\u8def\u590d\u7528\u5b9e\u8df5\u4e2d，\u9009\u62e9\u5668\u901a\u8fc7\u4e00\u6b21\u7cfb\u7edf\u8c03\u7528\u5c31\u53ef\u4ee5\u76d1\u6d4b\u591a\u4e2a\u901a\u9053\u7684\u72b6\u6001\u53d8\u5316，\u5927\u5927\u63d0\u9ad8\u4e86\u5e94\u7528\u7a0b\u5e8f\u7684I\/O\u6548\u7387\u3002 <\/p>\n
\u4f7f\u7528\u9009\u62e9\u5668\u53ef\u4ee5\u8ba9\u6211\u4eec\u53ea\u7528\u4e00\u4e2a\u7ebf\u7a0b\u6765\u76d1\u63a7\u591a\u4e2a\u901a\u9053\u7684\u72b6\u6001\u3002\u8fd9\u5bf9\u4e8e\u7ba1\u7406\u5927\u91cf\u8fde\u63a5\u7684\u7f51\u7edc\u670d\u52a1\u5668\u6765\u8bf4，\u662f\u4e00\u4e2a\u5de8\u5927\u7684\u4f18\u52bf\u3002\u9009\u62e9\u5668\u5c06\u4e8b\u4ef6\u5904\u7406\u903b\u8f91\u4e0e\u6570\u636e\u5904\u7406\u903b\u8f91\u5206\u79bb，\u907f\u514d\u4e86\u5728\u6bcf\u4e2a\u901a\u9053\u4e0a\u5206\u914d\u5355\u72ec\u7684\u7ebf\u7a0b，\u4ece\u800c\u663e\u8457\u51cf\u5c11\u4e86\u7ebf\u7a0b\u521b\u5efa\u548c\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u5f00\u9500\u3002 <\/p>\n
\u5728\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u4e2d，\u9009\u62e9\u5668\u4e0d\u4ec5\u4ec5\u662f\u4e00\u4e2aI\/O\u4e8b\u4ef6\u7684\u68c0\u6d4b\u5668，\u5b83\u8fd8\u53ef\u4ee5\u4f5c\u4e3a\u670d\u52a1\u5668\u67b6\u6784\u7684\u6838\u5fc3\u7ec4\u4ef6，\u6784\u5efa\u51fa\u4e8b\u4ef6\u9a71\u52a8\u7684\u670d\u52a1\u5668\u6a21\u578b\u3002\u5728\u8fd9\u4e2a\u6a21\u578b\u4e2d，\u670d\u52a1\u5668\u5faa\u73af\u68c0\u6d4b\u4e8b\u4ef6，\u5f53\u4e8b\u4ef6\u53d1\u751f\u65f6，\u5b83\u5c31\u5206\u53d1\u5230\u5bf9\u5e94\u7684\u5904\u7406\u5668\u4e0a\u8fdb\u884c\u4e1a\u52a1\u903b\u8f91\u7684\u5904\u7406\u3002 <\/p>\n
\u8fd9\u6837\u7684\u6a21\u578b\u53ef\u4ee5\u5f88\u597d\u5730\u6269\u5c55\u5230\u5927\u91cf\u7684\u5e76\u53d1\u8fde\u63a5，\u56e0\u4e3a\u6240\u6709\u901a\u9053\u90fd\u662f\u901a\u8fc7\u5355\u4e2a\u9009\u62e9\u5668\u6765\u7ba1\u7406，\u4e0d\u4f1a\u968f\u7740\u5e76\u53d1\u6570\u7684\u589e\u52a0\u800c\u7ebf\u6027\u589e\u52a0\u8d44\u6e90\u6d88\u8017\u3002\u6b64\u5916，\u8fd9\u79cd\u65b9\u5f0f\u8fd8\u5141\u8bb8\u670d\u52a1\u5668\u5bf9\u4e8b\u4ef6\u8fdb\u884c\u4f18\u5148\u7ea7\u6392\u5e8f\u548c\u8fc7\u6ee4，\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\u3002 <\/p>\n
\u6700\u7ec8，\u9009\u62e9\u5668\u4f7f\u5f97\u670d\u52a1\u5668\u80fd\u591f\u66f4\u52a0\u52a8\u6001\u5730\u5904\u7406\u4e8b\u4ef6，\u66f4\u597d\u5730\u54cd\u5e94\u8d1f\u8f7d\u53d8\u5316，\u8fd9\u5728\u9ad8\u5e76\u53d1\u548cI\/O\u5bc6\u96c6\u578b\u7684\u5e94\u7528\u4e2d\u5c24\u5176\u91cd\u8981\u3002 <\/p>\n
Java NIO\u4e2d\u7684 ServerSocketChannel \u662f\u7528\u4e8e\u76d1\u542c\u65b0\u8fdb\u6765\u7684TCP\u8fde\u63a5\u7684\u901a\u9053，\u5c31\u50cf\u6807\u51c6IO\u4e2d\u7684 ServerSocket \u4e00\u6837\u3002\u4f46\u4e0d\u540c\u7684\u662f， ServerSocketChannel \u662f\u901a\u8fc7\u901a\u9053\u7684API\u8fdb\u884c\u64cd\u4f5c，\u4f7f\u7684\u6211\u4eec\u80fd\u591f\u6784\u5efa\u975e\u963b\u585e\u7684\u670d\u52a1\u5668\u3002 <\/p>\n
\u901a\u8fc7 ServerSocketChannel ，\u6211\u4eec\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u7ba1\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5，\u800c\u4e14\u8fd8\u80fd\u66f4\u9ad8\u6548\u5730\u5904\u7406\u5b83\u4eec\u7684\u6570\u636e\u8bfb\u5199\u64cd\u4f5c\u3002 <\/p>\n
import java.nio.channels.ServerSocketChannel;<\/p>\n
public class ServerSocketChannelExample {
\n public static void main(String[] args) {
\n try {
\n \/\/ \u6253\u5f00ServerSocketChannel
\n ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
\n \/\/ \u7ed1\u5b9a\u5230\u6307\u5b9a\u7aef\u53e3
\n serverSocketChannel.socket().bind(new java.net.InetSocketAddress(8080));
\n \/\/ \u914d\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f
\n serverSocketChannel.configureBlocking(false);
\n System.out.println("Server is listening on port 8080");
\n \/\/ … \u540e\u7eed\u670d\u52a1\u5668\u903b\u8f91\u4ee3\u7801
\n } catch (Exception e) {
\n e.printStackTrace();
\n }
\n }
\n}<\/p>\n
\u5728\u6b64\u4ee3\u7801\u793a\u4f8b\u4e2d，\u6211\u4eec\u9996\u5148\u6253\u5f00\u4e00\u4e2a ServerSocketChannel \u5b9e\u4f8b，\u5e76\u5c06\u5176\u7ed1\u5b9a\u52308080\u7aef\u53e3\u3002\u6211\u4eec\u8fd8\u5c06\u901a\u9053\u914d\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f，\u8fd9\u662f\u5b9e\u73b0\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u7684\u5173\u952e\u3002 <\/p>\n
\u5728\u7ed1\u5b9a\u672c\u5730\u7aef\u53e3\u65f6，\u9700\u8981\u8003\u8651\u7aef\u53e3\u662f\u5426\u5df2\u88ab\u5360\u7528，\u4ee5\u53ca\u64cd\u4f5c\u7cfb\u7edf\u662f\u5426\u5141\u8bb8\u7a0b\u5e8f\u7ed1\u5b9a\u5230\u8be5\u7aef\u53e3\u3002\u5728\u591a\u6570\u60c5\u51b5\u4e0b，\u7aef\u53e31024\u4ee5\u4e0b\u9700\u8981\u7ba1\u7406\u5458\u6743\u9650\u624d\u80fd\u7ed1\u5b9a\u3002 <\/p>\n
import java.nio.channels.ServerSocketChannel;
\nimport java.nio.channels.SocketChannel;<\/p>\n
\/\/ … ServerSocketChannelExample \u7c7b\u4ee3\u7801<\/p>\n
while (true) {
\n \/\/ \u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5
\n SocketChannel clientChannel = serverSocketChannel.accept();
\n if (clientChannel != null) {
\n System.out.println("Accepted connection from " + clientChannel.getRemoteAddress());
\n \/\/ \u8bbe\u7f6e\u5ba2\u6237\u7aef\u901a\u9053\u4e3a\u975e\u963b\u585e\u6a21\u5f0f
\n clientChannel.configureBlocking(false);
\n \/\/ \u5904\u7406\u5ba2\u6237\u7aef\u8fde\u63a5
\n \/\/ handleClientConnection(clientChannel);
\n }
\n}<\/p>\n
\u5728\u975e\u963b\u585e\u6a21\u5f0f\u4e0b，\u5982\u679c\u5728\u6ca1\u6709\u4efb\u4f55\u8fde\u63a5\u65f6\u8c03\u7528 accept() \u65b9\u6cd5，\u8be5\u65b9\u6cd5\u5c06\u7acb\u5373\u8fd4\u56de null \u3002\u4e3a\u4e86\u4f7f\u670d\u52a1\u5668\u80fd\u6301\u7eed\u76d1\u542c\u8fde\u63a5\u8bf7\u6c42， accept() \u901a\u5e38\u653e\u5728\u4e00\u4e2a\u65e0\u9650\u5faa\u73af\u4e2d\u8c03\u7528\u3002 <\/p>\n
\u5728\u975e\u963b\u585e\u6a21\u5f0f\u4e0b， read() \u548c write() \u65b9\u6cd5\u5728\u5c1a\u672a\u5b8c\u6210\u64cd\u4f5c\u65f6\u4f1a\u7acb\u5373\u8fd4\u56de\u3002\u8fd9\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6027\u80fd\u7684\u7f51\u7edc\u5e94\u7528\u81f3\u5173\u91cd\u8981，\u56e0\u4e3a\u5b83\u5141\u8bb8\u670d\u52a1\u5668\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u3002 <\/p>\n
\u5728\u524d\u9762\u7684\u4ee3\u7801\u4e2d，\u6211\u4eec\u5df2\u7ecf\u901a\u8fc7\u8c03\u7528 configureBlocking(false) \u5c06 ServerSocketChannel \u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u6a21\u5f0f\u3002 <\/p>\n
import java.util.Iterator;
\nimport java.nio.channels.Selector;
\nimport java.nio.channels.spi.SelectorProvider;
\nimport java.net.InetSocketAddress;<\/p>\n
\/\/ … ServerSocketChannelExample \u7c7b\u4ee3\u7801<\/p>\n
Selector selector = Selector.open();
\nserverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);<\/p>\n
while (true) {
\n \/\/ \u7b49\u5f85\u81f3\u5c11\u4e00\u4e2a\u901a\u9053\u51c6\u5907\u5c31\u7eea
\n if (selector.select(1000) > 0) {
\n Iterator<SelectionKey> keyIterator = selector.selectedKeys().iterator();
\n while (keyIterator.hasNext()) {
\n SelectionKey key = keyIterator.next();
\n if (key.isAcceptable()) {
\n SocketChannel clientChannel = serverSocketChannel.accept();
\n clientChannel.configureBlocking(false);
\n \/\/ Register clientChannel with selector …
\n } else if (key.isReadable()) {
\n \/\/ Handle read …
\n } else if (key.isWritable()) {
\n \/\/ Handle write …
\n }
\n keyIterator.remove();
\n }
\n }
\n}<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d，\u6211\u4eec\u4f7f\u7528 Selector \u6765\u7ba1\u7406\u591a\u4e2a Channel \u3002 Selector \u5141\u8bb8\u5355\u4e2a\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5，\u8fd9\u662f\u6784\u5efa\u4e8b\u4ef6\u9a71\u52a8\u670d\u52a1\u5668\u7684\u5173\u952e\u7ec4\u4ef6\u3002 <\/p>\n
\u901a\u8fc7 Selector ，\u670d\u52a1\u5668\u80fd\u591f\u9ad8\u6548\u5730\u7ba1\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5，\u800c\u4e0d\u9700\u8981\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u5206\u914d\u4e00\u4e2a\u72ec\u7acb\u7684\u7ebf\u7a0b\u3002 <\/p>\n
\u6bcf\u4e2a\u8fde\u63a5\u7684\u751f\u547d\u5468\u671f\u4e8b\u4ef6，\u5982\u8fde\u63a5\u5efa\u7acb\u3001\u8bfb\u53d6\u3001\u5199\u5165\u7b49，\u90fd\u4f1a\u5728\u9009\u62e9\u5668\u4e2d\u6ce8\u518c\u4e00\u4e2a\u611f\u5174\u8da3\u7684\u4e8b\u4ef6\u3002\u670d\u52a1\u5668\u901a\u8fc7\u76d1\u542c\u8fd9\u4e9b\u4e8b\u4ef6\u6765\u5904\u7406\u5b83\u4eec\u3002 <\/p>\n
\u4e3a\u4e86\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u6548\u7387，\u53ef\u4ee5\u91c7\u7528\u5982\u4e0b\u7b56\u7565： <\/p>\n
\u901a\u8fc7\u5206\u914d\u5408\u9002\u7684 ByteBuffer \u5927\u5c0f\u4ee5\u53ca\u5faa\u73af\u5229\u7528\u7f13\u51b2\u533a，\u53ef\u4ee5\u6709\u6548\u7ba1\u7406\u5185\u5b58\u8d44\u6e90\u5e76\u63d0\u9ad8\u6570\u636e\u5904\u7406\u7684\u6548\u7387\u3002 <\/p>\n
\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7ecf\u5e38\u9047\u5230\u7684\u5f02\u5e38\u5305\u62ec IOException \u548c ClosedChannelException \u7b49\u3002\u5e94\u5f53\u59a5\u5584\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38，\u4ee5\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u5e76\u63d0\u4f9b\u826f\u597d\u7684\u7528\u6237\u4f53\u9a8c\u3002 <\/p>\n
\u5728Java NIO\u4e2d，\u4f7f\u7528 try-finally \u7ed3\u6784\u6765\u786e\u4fdd\u5373\u4f7f\u53d1\u751f\u5f02\u5e38，\u8d44\u6e90（\u5982\u901a\u9053\u548c\u9009\u62e9\u5668）\u4e5f\u80fd\u88ab\u6b63\u786e\u5173\u95ed\u548c\u91ca\u653e\u3002\u6b64\u5916，\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4f18\u5316\u7f13\u51b2\u533a\u7ba1\u7406\u6765\u51cf\u5c11\u8d44\u6e90\u7684\u4f7f\u7528\u548c\u63d0\u9ad8\u6027\u80fd\u3002 <\/p>\n
\u4ee5\u4e0a\u5185\u5bb9\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528Java NIO\u6765\u521b\u5efa\u4e00\u4e2a\u57fa\u4e8eSocket\u7684\u670d\u52a1\u5668，\u5305\u62ec\u901a\u9053\u7684\u521b\u5efa\u3001\u7aef\u53e3\u7ed1\u5b9a\u3001\u975e\u963b\u585e\u6a21\u5f0f\u7684\u5e94\u7528\u3001\u4e8b\u4ef6\u5faa\u73af\u5904\u7406\u3001\u8fde\u63a5\u7ba1\u7406\u4ee5\u53ca\u6570\u636e\u8bfb\u5199\u7b49\u6838\u5fc3\u6982\u5ff5\u3002\u5b9e\u8df5\u8fd9\u4e9b\u6280\u672f\u53ef\u4ee5\u5e2e\u52a9\u6784\u5efa\u9ad8\u6548\u7387\u3001\u53ef\u6269\u5c55\u7684\u7f51\u7edc\u5e94\u7528\u3002 <\/p>\n
\u672c\u6587\u8fd8\u6709\u914d\u5957\u7684\u7cbe\u54c1\u8d44\u6e90，\u70b9\u51fb\u83b7\u53d6 <\/p>\n
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