Javaソケット通信

package com.ustc;


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

public class Server {
    private static Socket soc = null;
    static BufferedReader bufferedReader= null;
    static PrintStream printStream = null;

    public static BufferedReader getBufferedReader() throws IOException{
        if(bufferedReader == null){
            Socket soc = getsock();
            bufferedReader = new BufferedReader(new InputStreamReader(soc.getInputStream()));
        }
        return bufferedReader;
    }

    public static PrintStream getPrintStream() throws IOException{
        if(printStream == null){
            Socket soc = getsock();
            printStream  = new PrintStream(soc.getOutputStream());
        }
        return printStream;
    }


    public static void main(String[] args) {
        try {
            soc = getsock();
        }
        catch (IOException e){
            e.printStackTrace();
        }
        accept();
        send("server");


    }
    public static Socket getsock() throws IOException{
        if(soc==null) {
            ServerSocket serverSocket = new ServerSocket(12345);
            return soc = serverSocket.accept();
        }
        else{
            return soc;
        }
    }
    public static void accept(){
        new Thread() {
            @Override
            public void run() {
                try{
                    System.out.println("   "+getBufferedReader().readLine());
                }
                catch(IOException e) {
                    System.out.println("      ");
                }
            }

        }.start();

    }
    public static void send(String str){
        new Thread() {
            @Override
            public void run() {
                try{
                    getPrintStream().println(str);
                    System.out.println("  "+str);
                }
                catch(IOException e) {
                    System.out.println("      ");
                }
            }

        }.start();
    }

}

Client  

package com.ustc;

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

public class client {
    static Socket soc = null;
    static BufferedReader bufferedReader = null;
    static PrintStream printStream;
    public static Socket getSoc() throws IOException{
        if(soc ==null) {
            soc = new Socket("127.0.0.1", 12345);
        }

        return soc;
    }

    public static BufferedReader getBufferedReader() throws IOException{
        if(bufferedReader == null){
            bufferedReader = new BufferedReader(new InputStreamReader(getSoc().getInputStream()));
            return bufferedReader;
        }
        return bufferedReader;
    }

    public static PrintStream getPrintStream() throws IOException{
        if(printStream == null){
            printStream = new PrintStream(getSoc().getOutputStream());
        }
        return printStream;
    }

    public static void main(String[] args) {
        try{
            soc = getSoc();
        }
        catch (IOException e){
            e.printStackTrace();
        }
        accept();
        send("client");

    }
    public static void accept(){
        new Thread(){
            @Override
            public void run() {
                try {
                    System.out.println("  "+getBufferedReader().readLine());
                }
                catch (IOException e){
                    e.printStackTrace();
                }

            }
        }.start();
    }
    public static void send(String str){
        new Thread(){
            @Override
            public void run() {
                try {
                    getPrintStream().println(str);
                    System.out.println("  "+str);
                }
                catch (IOException e){
                    e.printStackTrace();
                }
            }
        }.start();
    }


}