java 我执行一个非常简单的socket程序都出错！java.net.ConnectException: Connection refused:

Question

java  网络编程

 

我执行一个非常简单的socket程序都出错！要崩溃了！我关闭了防火墙也不行，试了Ping 127.0.0.1是可以的，而且我查了这个端口也没有被占用，怎么解决？

java.net.ConnectException: Connection refused: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

at java.net.Socket.connect(Socket.java:579)

at java.net.Socket.connect(Socket.java:528)

at java.net.Socket.<init>(Socket.java:425)

at java.net.Socket.<init>(Socket.java:208)

at com.hxw.socket.SimpleSocketClient.main(SimpleSocketClient.java:22)

java.lang.NullPointerException

at com.hxw.socket.SimpleSocketClient.main(SimpleSocketClient.java:37)

 

源码在此：

package com.hxw.socket;

import java.io.*;
import java.net.*;

/**
 * 简单的Socket客户端 功能为：发送字符串“Hello”到服务器端，并打印出服务器端的反馈
 */
public class SimpleSocketClient {
    public static void main(String[] args) {
        Socket socket = null;
        InputStream is = null;
        OutputStream os = null;
        // 服务器端IP地址
        String serverIP = "127.0.0.1";
        // 服务器端端口号
        int port = 10002;
        // 发送内容
        String data = "Hello";
        try {
            // 建立连接
            socket = new Socket(serverIP, port);
            // 发送数据
            os = socket.getOutputStream();
            os.write(data.getBytes());
            // 接收数据
            is = socket.getInputStream();
            byte[] b = new byte[1024];
            int n = is.read(b);
            // 输出反馈数据
            System.out.println("服务器反馈：" + new String(b, 0, n));
        } catch (Exception e) {
            e.printStackTrace(); // 打印异常信息
        } finally {
            try {
                // 关闭流和连接
                is.close();
                os.close();
                socket.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
    }
}

Answer 1

把server端代码也贴出来