URL网络编程，最大的特征就是一对一的响应！
1：客户端“写”，服务器端用于“读”
1 package coreBookSocket2; 2 3 import java.io.InputStreamReader; 4 import java.io.Reader; 5 import java.net.ServerSocket; 6 import java.net.Socket; 7 8 /* 9 * 这边为服务器端的读取 10 */ 11 12 /* 13 * 1：首先建立一个ServerSocket监听在端口8888上面，服务器端只需要定义和客户端相同的端口号即可 14 * 2：服务器端尝试接受来自客户端的请求 15 * 3：和客户端连接好了之后，就可以读取来自客户端的输入信息 16 * 4：定义一个StringBuilder对象用来保存来自客户端的信息 17 * 5：关闭Reader，client,server等占用资源的对象 18 */ 19 public class clientWtiteserverOpen { 20 21 public static void main(String[] args) throws Exception{ 22 ServerSocket server=new ServerSocket(8888); 23 Socket client =server.accept(); 24 Reader reader=new InputStreamReader(client.getInputStream()); //客户端获取自己的输入流 25 char[] ch=new char[64]; 26 int len; 27 StringBuilder sb=new StringBuilder(); 28 while( ( len=reader.read(ch) )!=-1) 29 { 30 sb.append(ch, 0, len); 31 } 32 System.out.println("From Client:"+sb); 33 reader.close(); 34 client.close(); 35 server.close(); 36 } 37 }
1 package coreBookSocket2; 2 3 import java.io.IOException; 4 import java.io.OutputStreamWriter; 5 import java.io.Writer; 6 import java.net.Socket; 7 import java.net.UnknownHostException; 8 /* 9 * 这边为客户端的写出 10 */ 11 12 /* 13 * 1：首先建立一个客户端的监听端口和IP地址，用相同的端口号与服务器端建立连接 14 * 2：从客户端向服务器端写出数据 15 */ 16 public class clientWriteserverOpen2 { 17 public static void main(String[] args) throws UnknownHostException, IOException { 18 19 Socket client=new Socket("127.0.0.1", 8888); 20 Writer writer=new OutputStreamWriter(client.getOutputStream()); 21 writer.write("Hello server"); 22 writer.flush(); 23 writer.close(); 24 client.close(); 25 26 } 27 28 }
2：客户端先写后读，服务器端先读后写
服务器端：
1 package ClientAndServerWriteBoth; 2 3 import java.io.IOException; 4 import java.io.InputStreamReader; 5 import java.io.OutputStreamWriter; 6 import java.io.Reader; 7 import java.io.Writer; 8 import java.net.ServerSocket; 9 import java.net.Socket; 10 11 /* 12 * 服务器端的编写 13 * 服务器端是先读后写，那么客户端必定是先写后读 14 */ 15 16 public class server { 17 public static void main(String[] args) throws IOException { 18 19 ServerSocket server=new ServerSocket(6666); 20 Socket client=server.accept(); 21 22 Reader reader=new InputStreamReader(client.getInputStream()); 23 char[] ch=new char[20]; 24 int len; 25 StringBuilder sb=new StringBuilder(); 26 String temp; 27 int index; 28 29 while(( len=reader.read(ch)) !=-1) 30 { 31 temp=new String(ch, 0, len); 32 if( (index = temp.indexOf("eof")) != -1)//遇到eof时就结束接收, 这个地方没有怎么看明白？为什么到eof就结束？ 33 { 34 sb.append(temp.substring(0, index)); 35 break; 36 } 37 sb.append(temp); 38 } 39 System.out.println("---From Client: "+sb); 40 41 Writer writer=new OutputStreamWriter(client.getOutputStream()); 42 writer.write("Hello Client I'm server! "); 43 writer.flush(); 44 writer.close(); 45 reader.close(); 46 client.close(); 47 server.close(); 48 } 49 }
客户端：
1 package ClientAndServerWriteBoth; 2 3 import java.io.IOException; 4 import java.io.InputStreamReader; 5 import java.io.OutputStreamWriter; 6 import java.io.Reader; 7 import java.io.Writer; 8 import java.net.Socket; 9 import java.net.UnknownHostException; 10 11 /* 12 * 客户端的编写，客户端先写后读 13 * 1:客户端设定特定的端口号与服务器端连接 14 */ 15 16 public class client { 17 public static void main(String[] args) throws UnknownHostException, IOException { 18 19 Socket client=new Socket("127.0.0.1", 6666); 20 Writer writer=new OutputStreamWriter(client.getOutputStream()); 21 writer.write("Hello server， I'm your father,client! 哈哈哈哈哈"); 22 writer.flush(); 23 //写完了开始读 24 25 Reader reader=new InputStreamReader(client.getInputStream()); 26 char[] ch=new char[20]; 27 int len; 28 StringBuffer sb=new StringBuffer(); 29 String temp; 30 int index; 31 32 while( (len=reader.read(ch))!=-1) 33 { 34 temp=new String(ch, 0, len); 35 if(( index=temp.indexOf("eof"))!=-1) 36 { 37 sb.append(temp.substring(0, index)); 38 break; 39 } 40 sb.append(new String(ch, 0, len)); 41 } 42 System.out.println("---From Server: "+sb); 43 writer.close(); 44 reader.close(); 45 client.close(); 46 } 47 }
3：一个服务器端，对应多个客户端的连接
一个服务器端和多个客户端连接最好的方式就是用线程，因为服务器端接受客户端的连接的accept（）方法是阻塞式的。
服务器端：
1 package oneServerForLotsClient; 2 3 import java.io.IOException; 4 import java.io.InputStreamReader; 5 import java.io.OutputStreamWriter; 6 import java.io.Reader; 7 import java.io.Writer; 8 import java.net.ServerSocket; 9 import java.net.Socket; 10 /* 11 * 这边主要是服务器的demo的编写 12 * 1：仍然是准备工作，让服务器端和客户端之间建立相同的端口号，实现连接。 13 * 2:----因为客户端那边是多个对象连接服务器端，因此需要一个死循环让服务器一直接受连接客户端的连接请求！！！ 14 * 建立一个新的线程去处理客户端的请求 15 *3:服务器端首先是“读取” 客户端发送过来的信息 16 */ 17 18 public class Server 19 { 20 public static void main(String[] args) throws IOException 21 { 22 23 ServerSocket server=new ServerSocket(6868); 24 while(true) 25 { 26 Socket client=server.accept(); 27 new Thread(new Task(client) ).start(); 28 } 29 } 30 }
1 package oneServerForLotsClient; 2 3 import java.io.BufferedReader; 4 import java.io.IOException; 5 import java.io.InputStreamReader; 6 import java.io.OutputStreamWriter; 7 import java.io.Writer; 8 import java.net.Socket; 9 /* 10 * 这个类主要是用来处理新的线程，实现Runnable接口 11 * 1：首先定一个构造方法，主要是为了初始化client对象 12 * 2：同时重写run（）方法，这个方法主要开启新的方法用于 “ 读” 数据，和 “写” 数据的处理 13 */ 14 15 public class Task implements Runnable { 16 17 private Socket client; 18 19 public Task(Socket client) 20 { 21 this.client=client; 22 } 23 24 @Override 25 public void run() { 26 try { 27 handlerSocket(); 28 } catch (IOException e) { 29 e.printStackTrace(); 30 } 31 } 32 33 private void handlerSocket() throws IOException { 34 BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream())); 35 StringBuilder sb = new StringBuilder(); 36 String temp; 37 int index; 38 while ((temp=br.readLine()) != null) { 39 System.out.println(temp); 40 if ((index = temp.indexOf("eof")) != -1) {//遇到eof时就结束接收 41 sb.append(temp.substring(0, index)); 42 break; 43 } 44 sb.append(temp); 45 } 46 System.out.println("from client: " + sb); 47 //读完后写一句 48 Writer writer = new OutputStreamWriter(client.getOutputStream()); 49 writer.write("Hello Client."); 50 writer.write("eof "); 51 writer.flush(); 52 writer.close(); 53 br.close(); 54 client.close(); 55 56 } 57 58 }
客户端
1 package oneServerForLotsClient; 2 3 import java.io.BufferedReader; 4 import java.io.IOException; 5 import java.io.InputStreamReader; 6 import java.io.OutputStreamWriter; 7 import java.io.Writer; 8 import java.net.Socket; 9 import java.net.UnknownHostException; 10 11 public class Client { 12 public static void main(String[] args) throws UnknownHostException, IOException { 13 14 Socket client=new Socket("127.0.0.1", 6868); 15 16 Writer writer=new OutputStreamWriter(client.getOutputStream()); 17 writer.write("Hello,Server. My name is client! "); 18 writer.write("eof "); 19 writer.flush(); 20 21 22 //写完了就开始读 23 24 BufferedReader reader=new BufferedReader(new InputStreamReader(client.getInputStream())); 25 StringBuffer buffer=new StringBuffer(); 26 String temp; 27 int index; 28 while ((temp=reader.readLine()) != null) { 29 if ((index = temp.indexOf("eof")) != -1) { 30 buffer.append(temp.substring(0, index)); 31 break; 32 } 33 buffer.append(temp); 34 } 35 System.out.println("from server: " + buffer); 36 writer.close(); 37 reader.close(); 38 client.close(); 39 40 } 41 42 }