java socket编程之实现客户端和服务器通讯一问一答

小咪咪 2022-02-21 13:53 275阅读 0赞

### ***环境*** ###

1、一台电脑

2、开启两个myeclipse进行通信

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### * 通讯思路* ###

1、客户端使用socket，绑定**服务器的IP地址和端口号**就可以连接服务器

![20190411082422544.png][]

2、客户端可以通过socket的输入流输出流方法对服务器进行读取和写入

3、服务器使用ServerSocket,开始监听，server.accept();   这个方法是阻塞的，只有有客户端连接上，才会往下执行

4、server.accept()返回的新的一个嵌套字socket,通过这个socket对客户端进行读取和写入

![20190411082348484.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70][]

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myeclispe的端口号设置成8080 和8090，开启两个myeclispe,两个myeclispe进行通信

*为什么修改tomcat的端口号，就可以了？*

*myeclipse做web项目的时候需要tomcat容器，tomcat依附在Myeclispe上，这个端口可以访问myeclispe的项目，也等同于myeclipse的"端口号"*

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 2][]

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###  服务端代码 ###

package cn.com.server;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.util.Scanner;
    public class SSocket {
    	public static void main(String[] args) {
    		ServerSocket server;
    			try {
    				server = new ServerSocket(8090);
    				Socket socket=server.accept();	
    				while(true){
    					System.out.println("----------");
    					  InputStream in;
    						try {
    							in = socket.getInputStream();
    							  byte [] b=new byte[1024];
    							   int len=0;
    							   StringBuffer sb=new StringBuffer();
    							   String s=null;
    							   if((len=in.read(b))!=-1){
    								    s=new String(b);
    								   sb.append(s);
    							   }
    							   OutputStream out=socket.getOutputStream();
    							   System.out.println("客户端信息:"+sb);
    							   Scanner sc=new Scanner(System.in);
    							   String str=sc.next();
    							   System.out.println("我："+str);
    							   out.write(str.getBytes());
    							   out.flush();
    						} catch (IOException e) {
    							// TODO Auto-generated catch block
    							e.printStackTrace();
    						}
    						 
    						   
    				}
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    	}
    }

### **客户端代码** ###

package cn.com.server;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.Socket;
    import java.net.UnknownHostException;
    import java.util.Scanner;
    public class ServerSocket {
    //服务器端
    	/*author:命运的信徒
    	 * date:2019/4/10
    	 * arm:做一个微型的qq
    	 */
    	//客户端发送信息
    	
    	public static void main(String[] args) {
    		OutputStream out=null;
    		Socket socket=null;
    		try {
    			//给192.168.0.106的服务器发送消息，通信的端口是8090
    			//绑定到本地端口
    			//SocketAddress so=new InetSocketAddress(8090);
    			socket=new Socket("127.0.0.1",8090);
    			//socket.bind(so);
    			//开始连接这个嵌套字
    			//socket.connect(so);
    			//发送消息
    			
    			while(true){
    				System.out.println("==========");
    				out=socket.getOutputStream();
    				//输入文字，希望从控制台输入的
    				Scanner san=new Scanner(System.in);
    				String str=san.next();
    				System.out.println("我:"+str);
    				out.write(str.getBytes());
    				out.flush();
    				//接收信息
    				InputStream in=socket.getInputStream();
    				//不仅仅是起到勺子舀输入流里面数据的作用，也是存储数据
    				byte [] b=new byte[1024];
    				StringBuffer sb=new StringBuffer();
    				int len=0;
    				 String s=null;
    				if((len=in.read(b))!=-1){
    					 s=new String(b);
    					 System.out.println(s);
    					sb.append(s);
    				}
    				System.out.println("来自服务器的数据:"+sb);
    			}	
    		} catch (UnknownHostException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally{
    			try {
    				out.close();
    				socket.close();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    		
    	}
    	
    	
    }

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###  效果如下 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 3][]

[20190411082422544.png]: /images/20220221/878b359285494a1ab1e1369c5dfefb32.png
[20190411082348484.png]: /images/20220221/14d1f348d55a46ddba2026231ac56e31.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70]: /images/20220221/5cb800a94f6a4282b4a0e93b95171134.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 1]: /images/20220221/d33be16b6cc5462ab34e6574b67b61d4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 2]: /images/20220221/7383bf2f305e452d8ba147b9c383b977.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NTkxNjM3_size_16_color_FFFFFF_t_70 3]: /images/20220221/e7c5f6d8838a4905874dd36bbef1077a.png