java 网络传输

1.URL类

InetAddress类

import java.net.InetAddress;import java.net.UnknownHostException;import java.util.Arrays;public class InetAddressTest {public static void main(String[] args) {try {//创建本机实例InetAddress address=InetAddress.getLocalHost();System.out.println("主机名:"+address.getHostName());  //主机名:WIN-H7CQ7OQ1VQHSystem.out.println("IP:"+address.getHostAddress());  //IP:121.248.9.62byte[] ip=address.getAddress();System.out.println("IP数组:"+Arrays.toString(ip));//IP数组:[121, -8, 9, 62]System.out.println(address);   //WIN-H7CQ7OQ1VQH/121.248.9.62//根据机器名创建实例InetAddress address2=InetAddress.getByName("WIN-H7CQ7OQ1VQH");System.out.println(address2);//根据IP创建实例InetAddress address3=InetAddress.getByAddress(ip);System.out.println(address3);} catch (UnknownHostException e) {e.printStackTrace();}}}

URL

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.MalformedURLException;import java.net.URL;public class URLTest {//URL类使用public void URLUse(){try {URL imooc=new URL("http://www.imooc.com");//根据现有URL新建URL,?后面表示参数，#后面表示锚点URL url=new URL(imooc,"/index.html?username=tom#test");System.out.println("协议名："+url.getProtocol());  //协议名：httpSystem.out.println("资源名："+url.getHost());   //资源名：www.imooc.com//如果未指定端口号，则使用默认端口号，此时getport()方法返回值为-1System.out.println("端口名："+url.getPort()); System.out.println("文件路径："+url.getPath());  //文件路径：/index.htmlSystem.out.println("文件名："+url.getFile());  //文件名：/index.html?username=tomSystem.out.println("相对路径："+url.getRef());  //相对路径：testSystem.out.println("查询字符串："+url.getQuery());  //查询字符串：username=tom} catch (MalformedURLException e) {e.printStackTrace();}}//使用URL读取网业内容public void URLRead(){try {URL url=new URL("http://www.baidu.com");//通过URL的openStream方法获取URL对象所表示的资源的字节输入流InputStream is= url.openStream();//将字节输入流转换为字符输入流InputStreamReader isr=new InputStreamReader(is,"utf-8");//为字符输入流添加缓冲BufferedReader br=new BufferedReader(isr);//读取数据String data=br.readLine();while(data!=null){System.out.println(data);data=br.readLine();};br.close();isr.close();is.close();} catch (MalformedURLException e) {e.printStackTrace();}catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) { URLTest test=new  URLTest(); test.URLRead();}}

2.Socket

1)ServerThread  自定义线程处理类

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 {Socket socket=null;public ServerThread(Socket socket){this.socket=socket;}public void run(){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 data;while((data=br.readLine())!=null){System.out.println(data);}socket.shutdownInput();os=socket.getOutputStream();pw=new PrintWriter(os);pw.write("我是服务器"+socket.getInetAddress());pw.flush();socket.shutdownOutput();}catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {if(br!=null)br.close();if(isr!=null)isr.close();if(is!=null)is.close();if(pw!=null)pw.close();if(os!=null)os.close();}catch (IOException e) {e.printStackTrace();}}}}

2）server

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.ServerSocket;import java.net.Socket;public class server {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubServerSocket server=null;Socket socket=null;try {server=new ServerSocket(8889);while(true){socket=server.accept();     //循环监听ServerThread thread=new ServerThread(socket);  //线程thread.start();   //启动线程}} catch (IOException e) {e.printStackTrace();}finally{try {socket.close();server.close();} catch (IOException e) {e.printStackTrace();}}}}

3)client

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 {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubtry {Socket socket=new Socket("localhost",8889);//写OutputStream os=socket.getOutputStream();PrintWriter pw=new PrintWriter(os);pw.write("我是客户端"+socket.getInetAddress());pw.flush();socket.shutdownOutput();//读InputStream is=socket.getInputStream();  InputStreamReader isr=new InputStreamReader(is);BufferedReader br=new BufferedReader(isr);String data;while((data=br.readLine())!=null){System.out.println(data);}socket.shutdownInput();pw.close();os.close();br.close();isr.close();is.close();socket.close();} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}