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 reset
	at 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 reset
	at 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();
        }
    }
}