Question

为什么创建本地Socket连接，创建不了，老是报错？

代码：
package javapackage.chapter;

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

public class SocketAppClient {

/**
* @param args
*/
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
Socket socket=new Socket("127.0.0.1",1234);
DataOutputStream dos=new DataOutputStream(socket.getOutputStream());
dos.writeUTF("XW");
DataInputStream dis=new DataInputStream(socket.getInputStream());
System.out.println(dis.readUTF());
socket.close();
dos.close();
dis.close();
}

}
异常显示：
Exception in thread "main" 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 javapackage.chapter.SocketAppClient.main(SocketAppClient.java:13)

Answer 1

异常提示写的很明白：本机上TCP 1234端口拒绝连接请求

原因：你在本机（127.0.0.1）的1234端口启动TCP服务器了吗？