java - 为什么会出现 SocketException？

Question

我有客户端类和服务器类，但是当我运行两个主要方法时，什么都不会发生，当我停止运行时，会发生此异常。为什么？？请帮助我，我该如何解决它？？？

我的客户端类:

public class Client {

static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    try {
        Socket c = new Socket("localhost", 5001);
        BufferedReader read = new BufferedReader(new InputStreamReader(c.getInputStream()));
        BufferedWriter write = new BufferedWriter(new OutputStreamWriter(c.getOutputStream()));
        String string = reader.readLine();
        write.write(string, 0, string.length());
        write.newLine();
        write.flush();
        System.out.println(read.readLine());



    } catch (Exception e) {
        System.err.println(e);
    }
}}

我的服务器类:

public class Server{

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    ServerSocket s = null;
    try {
        s = new ServerSocket(5001);
        System.out.println("listening...");
        Socket so = s.accept();
        BufferedReader read = new BufferedReader(new InputStreamReader(so.getInputStream()));
        BufferedWriter write = new BufferedWriter(new OutputStreamWriter(so.getOutputStream()));
        while (true) {
            String string = read.readLine();
            System.out.println(string);
            String answer = "I got" + string + "from you!";
            write.write(answer, 0, answer.length());
            write.newLine();
            write.flush();
        }
    } catch (IOException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    }

}}

服务器 cpnsole 中的堆栈跟踪:

run:


listening...
system connected
Hello

Dec 19, 2009 12:58:15 PM server.Main main
SEVERE: null
java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(SocketInputStream.java:168)
        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
        at java.io.InputStreamReader.read(InputStreamReader.java:167)
        at java.io.BufferedReader.fill(BufferedReader.java:136)
        at java.io.BufferedReader.readLine(BufferedReader.java:299)
        at java.io.BufferedReader.readLine(BufferedReader.java:362)
        at server.Main.main(Main.java:37)
BUILD SUCCESSFUL (total time: 9 seconds)

在客户端控制台中:

run:
Hello
I gotHellofrom you!
BUILD SUCCESSFUL (total time: 4 seconds)

Answer 1

您的客户端连接到服务器，发送一些数据，读取响应并终止。没关系。

但是您的服务器等待客户端，读取其数据，写入响应然后再次尝试从客户端读取一些数据。但客户端已经关闭了连接。因此服务器会得到您所描述的异常。

要解决此问题(在服务器端)，您必须在 while 循环中执行 Socket so = s.accept();。并且不要忘记在循环结束时关闭套接字。