java.net.SocketException: Connection reset

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背景

在我用socket进行TCP通信的时候，当我关闭client端时在服务端出现了Connection reset的异常。

一、问题

下面是异常信息：

Exception in thread "Thread-12" java.lang.RuntimeException: java.net.SocketException: Connection resetat com.smile.javabasic.nio.thread.ServerThreadExp.lambda$main$0(ServerThreadExp.java:26)at java.base/java.lang.Thread.run(Thread.java:842)
Caused by: java.net.SocketException: Connection resetat java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:328)at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:355)at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:808)at java.base/java.net.Socket$SocketInputStream.read(Socket.java:966)at java.base/java.io.InputStream.read(InputStream.java:218)at com.smile.javabasic.nio.thread.ServerThreadExp.lambda$main$0(ServerThreadExp.java:20)... 1 more

二、问题分分析

通过分析发现，原来是服务器还没有接收完我发送的数据，客户端就被关闭了，我们都知道，进行TCP通信时，连接建立好以后，才会进行数据传输，当数据传输完以后，服务端还会向客户端返回ACK信息（三次握手），这也可能会导致。下面是我的测试代码。

（1）服务端代码

public class ServerThreadExp {public static void main(String[] args) throws Exception {ServerSocket serverSocket = new ServerSocket(8088);while (true){System.out.println("等待接收");Socket socket = serverSocket.accept();new Thread(() -> {try {Thread.sleep(5000);System.out.println("线程："+Thread.currentThread().getName());InputStream in = socket.getInputStream();byte[] bytes = new byte[1024];in.read(bytes);System.out.println("数据："+new String(bytes));in.close();socket.close();} catch (IOException | InterruptedException e) {throw new RuntimeException(e);}}).start();}}
}

（2）客户端代码

public class ClientThreadExp {public static void main(String[] args) throws Exception {for (int i = 0; i < 10; i++) {Socket socket = new Socket("127.0.0.1", 8088);OutputStream out = socket.getOutputStream();out.write("hello world".getBytes());Thread.sleep(1000);out.close();socket.close();}}
}