Socket编程基本概念----imooc（2）

Socket编程2

使用多线程实现客户端的通信

服务端（中间的代码提取到了多线程类中（第三段代码））

package imooc.socket;

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

/**
* Created by zhangzexiang on 2016/9/17.
*
* 编程实现基于TCP的Socket通信，实现用户登录
*
* 服务器端
*/
public class Server {

public static void main(String[] args){
try {
//1 创建一个服务器段的Socket,即ServerSocket，指定绑定的端口，并监听此端口
ServerSocket serverSocket = new ServerSocket(8888);

Socket socket = null;
//record client number
int count = 0;
System.out.println("***server is beginning,wait client ***");

while (true) {
//2 调用accept()方法开始监听，等待客户端的连接
socket = serverSocket.accept();
//create a new thread
ServerThread serverThread = new ServerThread(socket);
//start thread
serverThread.start(); //多线程类（第三段代码）

count++; //统计客户端的数量
System.out.println("client number: "+count);

InetAddress address = socket.getInetAddress();
System.out.println("current client ip : "+address.getHostAddress());

}

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

}

客户端(基本没变)

package imooc.socket;

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

/**
* Created by zhangzexiang on 2016/9/17.
*
*
* 编程实现基于TCP的Socket通信，实现用户登录
*
* 客户端
*/
public class Client {

public static void main(String[] args) {

try {
//1 创建客户端Socket，指定服务器地址和端口
Socket socket = new Socket("localhost",8888);
//2 换取输出流，向服务器端发送信息
OutputStream os = socket.getOutputStream();//字节输出流
PrintWriter pw = new PrintWriter(os); //将输出流包装为打印流
pw.write("username:admin;password:123");
pw.flush();
socket.shutdownOutput();//colse outputStream

//3 获取输入流，并读取服务器端的相应消息
InputStream is =socket.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String info = null;
while((info=br.readLine())!=null){//循环读取服务端的信息
System.out.println("我是客户端，服务器说："+info);
}

//4 colse resource
br.close();
is.close();
pw.close();
os.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

多线程（服务端用到）

package imooc.socket;

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

/**
* Created by zhangzexiang on 2016/9/19.
*
* 服务器线程处理类
*/
public class ServerThread extends Thread{
//和本线程相关的Socket
Socket socket = null;

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

//线程执行的操作，相应客户端的请求
public void run(){

InputStream is = null;//字节输入流
InputStreamReader isr = null;//将字节流转换为字符流
BufferedReader br = null;//为输入流添加缓冲
OutputStream os = null;
PrintWriter pw = null;   //包装为打印流

try {
//3 获取输入流，并读取客户端信息
is = socket.getInputStream();
isr = new InputStreamReader(is);
br = new BufferedReader(isr);
String info = null;
while((info=br.readLine())!=null){//循环读取客户端的信息
System.out.println("我是服务器，客户端说："+info);
}
socket.shutdownInput();//关闭输入流

//4 获取输出流，响应客户端的请求
os = socket.getOutputStream();
pw = new PrintWriter(os);
pw.write("welcome!");
pw.flush();//调用flush()方法将缓冲输出
} catch (IOException e) {
e.printStackTrace();
} finally {

try {
//5 关闭资源
if(pw!=null)
pw.close();
if(os!=null)
os.close();
if(br!=null)
br.close();
if(isr!=null)
isr.close();
if(is!=null)
is.close();
if(socket!=null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

运行结果（是用一个用户来模拟多个用户，所以IP一样，但是IP为啥是127.0.0.1呢？？？）

***server is beginning,wait client ***
client number: 1
current client ip : 127.0.0.1
我是服务器，客户端说：username:admin;password:123
client number: 2
current client ip : 127.0.0.1
我是服务器，客户端说：username:admin;password:123