Java网络编程一
1.InetAddress的应用
import java.util.List; import java.math.BigDecimal; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.LinkedList; import java.util.Scanner; import java.util.Set; import java.util.Stack; import javax.naming.spi.DirStateFactory.Result; import org.omg.PortableInterceptor.DISCARDING; import java.util.Map; import java.util.Queue; /** * InetAddress类 * @author 16114 * */ public class Main{ public static void main(String[] args) { try { InetAddress address = InetAddress.getLocalHost(); System.out.println("计算机名：" + address.getHostName()); System.out.println("IP地址：" + address.getHostAddress()); byte[] bytes = address.getAddress(); System.out.println("字节数组形式的IP：" + Arrays.toString(bytes)); System.out.println(address); } catch (UnknownHostException e) { e.printStackTrace(); } try { InetAddress address2 = InetAddress.getByName("Roni"); System.out.println(address2.getHostName()); System.out.println(address2.getHostAddress()); } catch (UnknownHostException e) { e.printStackTrace(); } } }
2.URL
import java.util.List; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.math.BigDecimal; import java.net.InetAddress; import java.net.MalformedURLException; import java.net.URL; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.LinkedList; import java.util.Scanner; import java.util.Set; import java.util.Stack; import javax.naming.spi.DirStateFactory.Result; import org.omg.PortableInterceptor.DISCARDING; import java.util.Map; import java.util.Queue; /** * URL类 * @author 16114 * */ public class Main{ public static void main(String[] args) { try { URL url = new URL("http://www.baidu.com"); try { InputStream is = url.openStream(); InputStreamReader isr = new InputStreamReader(is,"utf-8"); BufferedReader br = new BufferedReader(isr); String data = br.readLine(); while(data!=null) { System.out.println(data); data=br.readLine(); } br.close(); isr.close(); is.close(); } catch (IOException e) { e.printStackTrace(); } } catch (MalformedURLException e) { e.printStackTrace(); } } }
3.客户端向服务器端的通信
Server
package com.zrl.thread; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.ServerSocket; import java.net.Socket; import java.util.Scanner; /** * 基于TCP协议的Socket协议 * 服务端 * @author 16114 * */ public class Server { public static void main(String[] args) { //1.创建一个服务器端Socket，即ServerSocket，指定绑定的端口 try { ServerSocket serverSocket = new ServerSocket(8888); //2.调用accept（）方法开始监听，等待客户端的连接 System.out.println("***服务器即将启动，等待客户端的链接***"); Socket socket = serverSocket.accept(); //3.获取输入流，并读取客户端信息 InputStream is = socket.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String info = null; while((info=br.readLine())!=null) { System.out.println("我是服务器，客户端说：" + info); } socket.shutdownInput(); //4.关闭相关资源 br.close(); isr.close(); is.close(); socket.close(); serverSocket.close(); } catch (IOException e) { e.printStackTrace(); } } }
Client
package com.zrl.thread; import java.io.IOException; import java.io.OutputStream; import java.io.PrintWriter; import java.net.Socket; import java.net.UnknownHostException; public class Client { public static void main(String[] args) { //1.创建客户端Socket，指定服务器端地址和端口 Socket socket; try { socket = new Socket("localhost", 8888); //2.获取输出流，向服务器发送消息 OutputStream os = socket.getOutputStream(); PrintWriter pw = new PrintWriter(os);//将输出流包装为打印流 pw.write("用户名：admin;密码:123"); pw.flush(); socket.shutdownInput(); //3.关闭资源 pw.close(); os.close(); socket.close(); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
一个服务端，多个客户端
Server.java
package com.zrl.thread; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.InetAddress; import java.net.ServerSocket; import java.net.Socket; import java.util.Scanner; /** * 基于TCP协议的Socket协议 * 服务端 * @author 16114 * */ public class Server { public static void main(String[] args) { //1.创建一个服务器端Socket，即ServerSocket，指定绑定的端口 try { ServerSocket serverSocket = new ServerSocket(8888); //2.调用accept（）方法开始监听，等待客户端的连接 System.out.println("***服务器即将启动，等待客户端的链接***"); Socket socket = null; //记录客户端的数量 int cnt = 0; //循环监听等待客户端的连接 while(true) { //调用accept（）方法开始监听，等待客户端的连接 socket = serverSocket.accept(); //创建一个新线程 ServerThread serverThread = new ServerThread(socket); //启动线程 serverThread.start(); cnt++; System.out.println("客户端的数量：" + cnt); InetAddress address = socket.getInetAddress(); System.out.println("当前客户端的IP：" + address.getHostAddress()); } } catch (IOException e) { e.printStackTrace(); } } }
Client.java
package com.zrl.thread; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.Socket; import java.net.UnknownHostException; public class Client { public static void main(String[] args) { //1.创建客户端Socket，指定服务器端地址和端口 Socket socket; try { socket = new Socket("localhost", 8888); //2.获取输出流，向服务器发送消息 OutputStream os = socket.getOutputStream(); PrintWriter pw = new PrintWriter(os);//将输出流包装为打印流 pw.write("用户名：admin; 密码:456"); pw.flush(); socket.shutdownOutput(); //3.获取输入流并且读取服务器端的响应信息 InputStream is = socket.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String info = null; while((info=br.readLine())!=null) { System.out.println("我是客户端，服务端说：" + info); } //4.关闭资源 br.close(); is.close(); pw.close(); os.close(); socket.close(); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
ServerThread.java
package com.zrl.thread; /** * 服务器端线程处理类 * @author 16114 * */ import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.Socket; 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，响应客户端的请求 @Override public void run() { //获取输入流，并读取客户端信息 InputStream is=null; InputStreamReader isr=null; BufferedReader br=null; OutputStream os =null; PrintWriter pw = null; try { is = socket.getInputStream(); isr = new InputStreamReader(is); br = new BufferedReader(isr); String info = null; while((info=br.readLine())!=null) { System.out.println("我是服务器，客户端说：" + info); } socket.shutdownInput(); //获取输出流，响应客户端的请求 os = socket.getOutputStream(); pw = new PrintWriter(os); //包装为打印流 pw.write("欢迎您！"); pw.flush(); //调用flush将缓冲输出 } catch (IOException e) { e.printStackTrace(); }finally {//关闭相关资源 try { 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(); } } } }
