java socket编程实例代码讲解_java

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1、所谓socket通常也称作"套接字",用于描述IP地址和端口,是一个通信链的句柄。应用程序通常通过"套接字"向网络发出请求或者应答网络请求。

操作java socket时用到的最多的三个方法为:

accept():主要用于服务器端产生“阻塞”,等待客户端的链接请求,并且返回一个客户端的Socket实例;

getInputStream():方法主要用来获得网络连接输入,同时返回一个InputStream对象实例;

getOutputStream():方法和上面的getInputStream相反。

2、一般要建立Java的Socket连接,应首先明确服务器端和客户端,服务器端使用ServerSocket监听指定的端口,使用accept等待客户端请求,链接链接,开始会话、完成会话后,关闭链接。(注意,一般socket的关闭都应该是服务器端来进行的,后面说);客户端使用Socket对网络中的某个服务器的某个端口发出链接请求,连接成功,开始会话,会话完成,Socket关闭。

2、示例代码:

服务器端:


package com.icer.server;

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

/**
 * Server
 *
 * @author Icer
 *
 */
public class Server {

    private ServerSocket ss;
    private Socket s;
    private BufferedReader br;
    private PrintWriter pw;

    public Server() {
        try {
                ss = new ServerSocket(10000);
                System.out.println("Server is starting...");
                s = ss.accept();
                br = new BufferedReader(new InputStreamReader(s.getInputStream()));
                pw = new PrintWriter(s.getOutputStream(),true);
                String line = br.readLine();
                System.out.println(line);
                pw.println("your word is:" + line);
                //pw.println("helloworld");
                br.close();
                pw.close();

        } catch (IOException ie) {
            ie.printStackTrace();
        }

    }

    public static void main(String[] args) throws Exception {
        new Server();
    }
}

客户端:


package com.icer.client;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

/**
 * Client
 * @author Icer
 *
 */
public class Client {

    private Socket s;
    private BufferedReader br;
    //private BufferedReader line;
    private PrintWriter pw;
    private String line = "";
    public Client() {
        try{
            s = new Socket("127.0.0.1",10000);
            pw = new PrintWriter(s.getOutputStream(),true);
            br = new BufferedReader(new InputStreamReader(s.getInputStream()));
            pw.println("hello");
            line = br.readLine();
            System.out.println(line);

            br.close();
            pw.close();
        }catch(IOException ie){
            ie.printStackTrace();
        }
    }
    public static void main(String[] args) throws Exception {
        new Client();
    }
}

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