java socket 编程遇到的问题

Question

最近初步学习java socket 编程的时候遇到一个问题就是，当客户端向服务端发送数据时，会出现不能输入也不能，程序卡住的现象，尤其是中文，最多输入两行，控制台就不能再输入数据（客户端输入是用system.in来从键盘获取数据）。英文字符还好一些，但也会出现此种状况，百思不得其解！代码如下：[code="java"][/code]
server：
package dragon.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class MyServer {

/**
 * @param args
 * @throws IOException 
 */

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    ServerSocket ss = null;
    PrintWriter out = null;
    BufferedReader in = null;


    try {
        ss = new ServerSocket(1111);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        System.err.println("could not listen port:1111");
        System.exit(1);
        e.printStackTrace();
    }
    Socket inComing = null;
    while(true){
        inComing = ss.accept();
        out = new PrintWriter(inComing.getOutputStream(),true);
        in = new BufferedReader(new InputStreamReader(inComing.getInputStream(),"GBK"));
        out.println("hello!....");
        out.println("enter BYE to exit");
        out.flush();

        while(true){
            String str = in.readLine();
            if(str==null){
                break;
            }
            else{
                out.println("Echo:"+str);
                System.out.println(str);
                out.flush();
                if(str.trim().equalsIgnoreCase("BYE")){
                    break;
                }
            }
        }

        out.close();
        inComing.close();
        ss.close();
    }

}

}
client：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {
public static void main(String[] args) throws IOException {
Socket s = null;
PrintWriter out = null;
BufferedReader in = null;

    try {
        s = new Socket("localhost", 1111);
        out = new PrintWriter(s.getOutputStream(),true);
        in = new BufferedReader(new InputStreamReader(s.getInputStream()));
    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    System.out.println(in.readLine());
    System.out.println(in.readLine());
    BufferedReader stdln = new BufferedReader(new InputStreamReader(System.in));
    String userInput;
    while((userInput=stdln.readLine())!=null){
        out.println(userInput);
        System.out.println(in.readLine());
    }
    out.close();
    in.close();
    s.close();
}

}

Answer 1

我想是因为，在客户端，你的输入对象是控制台，这个时候控制台就相当于一个记事本了，你想在什么地方输入，就在什么输入，当然是可以输入的地方。例如下一行和已经输入过的地方，因为这戏地方，都有了占位符，一旦你敲入回车键，那么就readLine了，接着就到服务器端了。