Java 客户端-服务器应用程序抛出“java.net.SocketException：

Question

我试图创建一个客户端-服务器应用程序，其中客户端生成一个随机数并向服务器发送 n 个字符串。连接关闭发送字符串“BYE”。之后服务器必须计算接收到的字符串的总长度并打印出来。

问题是，当我的客户端尝试连接到服务器时，此客户端抛出“java.net.SocketException：连接重置”异常并崩溃。

这是我的客户代码：

import java.net.*;

import java.io.*;

import java.util.Random;

import java.util.logging.Level;

import java.util.logging.Logger;

public class ClientStringa {

    public static void main(String[] args) {

        try{

            Socket socket = new Socket("localhost", 5555);

            PrintWriter out = new PrintWriter(socket.getOutputStream());

            Random r = new Random();

            int N = r.nextInt(100);

            for(int i=1;i<=N;i++){

                out.println("String" +i);    

            }

            out.flush();

        }

        catch (IOException ex) {

            Logger.getLogger(ClientStringa.class.getName()).log(Level.SEVERE, null, ex);    

        }

    }

}

我的服务器代码：

import java.io.*;

import java.net.*;

import java.util.logging.Level;

import java.util.logging.Logger;

public class ServerStringa {

    public static void main(String[] args) {

        try {

            ServerSocket socket = new ServerSocket(5555);

            while(true){

                System.out.println("Waiting for client connections...");

                Socket client = socket.accept();    //connessione dei client

                ThreadStringa thread = new ThreadStringa(client);

                thread.start();             

            }

        } catch (IOException ex) {

            Logger.getLogger(ServerStringa.class.getName()).log(Level.SEVERE, null, ex);

        }   

    }  

}

Answer 1

在socket编程中，应该使用DataOutputStream而不是客户端程序中的PrintWriter来与Server通信。还要记住从客户端执行 close() 。我只修改了你的客户端程序，你可以检查一下。import java.net.*;import java.io.*;import java.util.Random;import java.util.logging.Level;import java.util.logging.Logger;public class ClientStringa {&nbsp; &nbsp; public static void main(String[] args) {&nbsp; &nbsp; &nbsp; &nbsp; try{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Socket socket = new Socket("localhost", 5555);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DataOutputStream out=new DataOutputStream(socket.getOutputStream());//&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PrintWriter out = new PrintWriter(socket.getOutputStream());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Random r = new Random();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int N = r.nextInt(100);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for(int i=1;i<=N;i++){//&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.println("String" +i);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.writeUTF("String" +i);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.flush();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; out.close();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; catch (IOException ex) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Logger.getLogger(ClientStringa.class.getName()).log(Level.SEVERE, null, ex);&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}