java利用Socket在控制台互发信息没有正常显示

【网络编程】java利用Socket在控制台互发信息。但是在客户端控制台输入信息后，服务器端控制台无消息显示。
原因：PrintWriter printWriter = new PrintWriter(outputStream, true); 必须在加上true，意味着想要将数据打印到outputStream中，并使用自动刷新。
加上后代码如下，结果如图：

客户端：

public class Client3 {
    public static void main(String[] args) throws IOException {
        // 创建socket对象，指定数据接收方的ip地址和端口号
        Socket client = new Socket("localhost", 10001);
        //----------------从控制台输入服务器端输出----------
        // 从控制台输入数据
        InputStreamReader inputStreamReader = new InputStreamReader(System.in);
        // 存入缓冲区
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        // 获取输出流对象，向服务端发送数据
        OutputStream outputStream = client.getOutputStream();
        PrintWriter printWriter = new PrintWriter(outputStream, true);
        //------------接收服务器端数据--------------------
        InputStream inputStream = client.getInputStream();
        InputStreamReader inputStreamReader2 = new InputStreamReader(inputStream);
        BufferedReader bufferedReader2 = new BufferedReader(inputStreamReader2);

        while (true) {
            System.out.println("我说：");
            String str = bufferedReader.readLine(); // 获取数据
            printWriter.println(str);

            String receive = bufferedReader2.readLine(); // 获取数据
            System.out.println("服务器说：" + receive);
        }
    }
}

服务器端：

package server;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * 多线程解决
 */
public class Server3 {
    public static void main(String[] args) throws IOException {

        try {
            // 服务端需要使用serversocket来开放本地的端口
            ServerSocket serverSocket = new ServerSocket(10001);
            Socket socket = serverSocket.accept();
            //------------接收客户端数据---------------
            // 通过server获取输入流对象
            InputStream inputStream = null;
            inputStream = socket.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader br = new BufferedReader(inputStreamReader);
            //------------向客户端输出数据---------------
            OutputStream outputStream = null;
            outputStream = socket.getOutputStream();
            PrintWriter printWriter = new PrintWriter(outputStream, true);
            InputStreamReader isr2 = new InputStreamReader(System.in);
            BufferedReader br2 = new BufferedReader(isr2);
            while (true) {
                String str = null; //读出缓存区数据
                str = br.readLine();
                System.out.println("客户端说：" + str);

                System.out.println("我说：");
                String str2 = null;
                str2 = br2.readLine();
                printWriter.println(str2);
            }
        } catch (Exception e){

        }
    }
}

也可以利用多线程实现上述代码。只需要改变Server3.java，再增加一个ServerThread.java即可。

Server3.java

public class Server3 {
    public static void main(String[] args) throws IOException {
        // 服务端需要使用serversocket来开放本地的端口
        ServerSocket serverSocket = new ServerSocket(10001);
        Socket socket = serverSocket.accept();
        ServerThread serverThread = new ServerThread(socket);
        new Thread(serverThread).start();
    }
}

ServerThread.java

public class ServerThread implements Runnable{
    private Socket socket;

public ServerThread(Socket socket) {
    this.socket = socket;
}

@Override
public void run() {
    try {
        //------------接收客户端数据---------------
        // 通过server获取输入流对象
        InputStream inputStream = null;
        inputStream = socket.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(inputStreamReader);
        //------------向客户端输出数据---------------
        OutputStream outputStream = null;
        outputStream = socket.getOutputStream();
        PrintWriter printWriter = new PrintWriter(outputStream, true);
        InputStreamReader isr2 = new InputStreamReader(System.in);
        BufferedReader br2 = new BufferedReader(isr2);
        while (true) {
            String str = null; //读出缓存区数据
            str = br.readLine();
            System.out.println("客户端说：" + str);

            System.out.println("我说：");
            String str2 = null;
            str2 = br2.readLine();
            printWriter.println(str2);
        }
    } catch (Exception e){

    }
}
}