网络编程TCP(五)

补充：网络编程tcp(二)

package com;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;



import java.net.UnknownHostException;

import org.junit.Test;

public class TestTcp1 {
	//客户端
	@Test
	public void client(){
		Socket socket=null;
		OutputStream os=null;
		try {
			socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);
			os = socket.getOutputStream();
			os.write("我是1号客户，请多关照".getBytes());//向外输出数据
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(os!=null){
				try {
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(socket!=null){
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
	//服务端
	@Test
	public void server(){
		ServerSocket server=null;
		Socket socket=null;
		InputStream is=null;
		try {
			server=new ServerSocket(9000);
			socket=server.accept();//accept拿到客户端socket对象
			is=socket.getInputStream();//向程序里写入数据
			byte[] b=new byte[20];
			int len;
			while((len=is.read(b))!=-1){
				String str=new String(b,0,len);
				System.out.println(str);
			}
			System.out.println("小伙子：收到来自"+socket.getLocalAddress());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally{
			if(is!=null){
				try {
					is.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(socket!=null){
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(server!=null){
				try {
					server.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}

上例是只能客户端发送，服务器接收。下面的例子是服务器和客户端交互。有问有答。

package com;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;



import java.net.UnknownHostException;

import org.junit.Test;


/**
 * 案例：客户端给服务器发送消息，服务器打印信息。同时发出“已收到信息”给客户
 * @author Administrator
 *
 */


public class TestTcp2 {
	//客户端
	@Test
	public void client(){
		Socket socket=null;
		OutputStream os=null;
		InputStream is=null;
		try {
			socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);
			os = socket.getOutputStream();
			os.write("wo shi kehu 2".getBytes());//向外输出数据，供服务器读取
			
			socket.shutdownOutput();//显示告知，服务端“发送完了！！”，
			
			
			is=socket.getInputStream();
			byte[] b=new byte[50];
			int len;
			while((len=is.read(b))!=-1){
				String str=new String(b,0,len);
				System.out.println(str);
			}
			
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(is!=null){
				try {
					is.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(os!=null){
				try {
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(socket!=null){
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
	//服务端
	@Test
	public void server(){
		ServerSocket server=null;
		Socket socket=null;
		InputStream is=null;
		OutputStream os=null;
		try {
			server=new ServerSocket(9000);
			socket=server.accept();//accept拿到客户端socket对象
			is=socket.getInputStream();//拿到客户端的socket的数据向程序里写入数据
			byte[] b=new byte[20];
			int len;
			while((len=is.read(b))!=-1){
				String str=new String(b,0,len);
				System.out.println("fuwqi:收到了："+socket.getLocalAddress()+str);
			}
			
			//然后服务器说了，我收到信息我也给你回馈
			os=socket.getOutputStream();
			os.write("shou dao ni de xinxile ,yihouhuihaohao guanzhao ni de ".getBytes());
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally{
			if(os!=null){
				try {
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(is!=null){
				try {
					is.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(socket!=null){
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(server!=null){
				try {
					server.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}