JAVASE----19----网络编程2

上传图片

package net2;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;import java.net.UnknownHostException;/* 客户端： 1，服务端点 2，读取客户端已有的图片数据 3，通过socket输出流将数据发给服务端 4，读取服务端反馈信息 5，关闭 */public class PicClient {public static void main(String[] args) throws Exception {Socket s=new Socket("192.168.1.102", 10029);BufferedInputStream bufr=new BufferedInputStream(new FileInputStream("C:\\1.jpg"));OutputStream out=s.getOutputStream();byte[]buf=new byte[1024];int len=0;while((len=bufr.read(buf))!=-1){out.write(buf,0,len);}//告诉服务端数据已写完s.shutdownOutput();       InputStream in=s.getInputStream();       byte[] bufIn=new byte[1024];    int num=in.read(bufIn);    System.out.println(new String(bufIn,0,num));    bufr.close();    s.close();}}

package net2;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;/* * 服务端 */public class PicServer {public static void main(String[] args) throws Exception {       ServerSocket ss=new ServerSocket(10029);       Socket s=ss.accept();       String ip = s.getInetAddress().getHostAddress();System.out.println("ip" + ip + "connect...");       InputStream in= s.getInputStream();       FileOutputStream  fos=new FileOutputStream("server.jpg");       byte[]buf=new byte[1024];int len=0;while((len=in.read(buf))!=-1){fos.write(buf,0,len);}OutputStream  out=s.getOutputStream() ;out.write("上传成功".getBytes());fos.close();        s.close();        ss.close();}}

这个服务端有局限性，当A客户端连接上后，被服务端收到，服务端执行具体流程，这时B客户端连接只有等待。
因为服务端还没有处理完A客户端的请求，还有循环回来执行下次accept方法，所以暂时获取不到B客户端对象。
  那么为了让多个客户端并发访问服务端，那么服务端最好将每个客户端封装进单独的线程中，这样就可以同时处理多个客户端请求

如何定义线程呢？ 只要明确了每一个客户端要在服务端执行的代码即可，将该代码存入run方法中

package net2;import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;/* 客户端： 1，服务端点 2，读取客户端已有的图片数据 3，通过socket输出流将数据发给服务端 4，读取服务端反馈信息 5，关闭 */public class PicClient {public static void main(String[] args) throws Exception {//if(args.length!=1)//{//System.out.println("请选择一个jpg格式的图片");//return;//}//File file=new File(args[0]);//if(!(file.exists()&&file.isFile()))//{//System.out.println("该文件有问题");//return;//}//if(file.getName().endsWith(".jpg"))//{//System.out.println("图片格式错误，请重新选择");//return;//}////if(file.length()>1024*1024*5)//{//System.out.println("文件过大，没安好心");//}Socket s=new Socket("192.168.1.102", 10029);BufferedInputStream bufr=new BufferedInputStream(new FileInputStream("c:\\1.jpg"));OutputStream out=s.getOutputStream();byte[]buf=new byte[1024];int len=0;while((len=bufr.read(buf))!=-1){out.write(buf,0,len);}//告诉服务端数据已写完s.shutdownOutput();       InputStream in=s.getInputStream();       byte[] bufIn=new byte[1024];    int num=in.read(bufIn);    System.out.println(new String(bufIn,0,num));    bufr.close();    s.close();}}

package net2;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;/* * 服务端 *  */public class PicServer {public static void main(String[] args) throws Exception {       ServerSocket ss=new ServerSocket(10029);          while(true)    {     Socket s=ss.accept();     new Thread(new PicThread(s)).start();    }}}

package net2;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;public class PicThread implements Runnable {private  Socket s;PicThread(Socket s){this.s=s;}@Overridepublic void run() {int count=1;String ip = s.getInetAddress().getHostAddress();try{System.out.println("ip" + ip + "connect...");       InputStream in= s.getInputStream();              File file=new File(ip+"("+count+")"+".jpg");       while(file.exists())       {        file=new File(ip+"("+(count++)+")"+".jpg");       }       FileOutputStream  fos=new FileOutputStream(file);       byte[]buf=new byte[1024];int len=0;while((len=in.read(buf))!=-1){fos.write(buf,0,len);}OutputStream  out=s.getOutputStream() ;out.write("上传成功".getBytes());fos.close();        s.close();       }catch(Exception e){throw new RuntimeException(ip+"上传失败");}}}

练习：
客户端通过键盘录入用户名，服务端对这个用户名进行校验，如果该用户名存在，在服务端显示XXX已登录，并在客户端显示XXX欢迎光临，
如果该用户不存在，在服务端显示XXX，尝试登录，并在客户端显示XXX用户名不存在，最多就登录3次

package net2;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;public class LoginClient {public static void main(String[] args) throws Exception {Socket s=new Socket("192.168.1.102", 10030);BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));  PrintWriter out=new PrintWriter(s.getOutputStream(),true);  BufferedReader  bufIn=new BufferedReader(new  InputStreamReader(s.getInputStream()));  for(int x=0;x<3;x++)  { String line=bufr.readLine(); if(line==null) { break; } out.println(line); String info=bufIn.readLine(); System.out.println("info:"+info); if(info.contains("欢迎")) { break; }  }  bufr.close();          s.close();}}

package net2;import java.net.ServerSocket;import java.net.Socket;public class LoginServer {public static void main(String[] args) throws Exception {ServerSocket ss = new ServerSocket(10030); while(true)    {     Socket s=ss.accept();     new Thread(new UserThread(s)).start();    }}}

package net2;import java.io.BufferedReader;import java.io.FileReader;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;public class UserThread implements Runnable {private  Socket s;UserThread(Socket s){this.s=s;}@Overridepublic void run() {String ip=s.getInetAddress().getHostAddress();System.out.println(ip+"...connected");try {for(int x=0;x<3;x++){BufferedReader bufIn = new BufferedReader(new InputStreamReader(s.getInputStream()));String name=bufIn.readLine();if(name==null)break;BufferedReader bufr = new BufferedReader(new FileReader("c:\\user.txt"));PrintWriter out=new PrintWriter(s.getOutputStream(),true);String line=null;boolean flag=false;while((line=bufr.readLine())!=null){if(line.equals(name));{flag=true;break;}}if(flag){System.out.println(name+",已登录");out.println(name+",欢迎光临");break;}else{System.out.println(name+",尝试登录");out.println(name+",用户名不存在");}}s.close();} catch (Exception e) {           throw new RuntimeException(ip+"校验失败");}}}

这个标记判断有点问题，目前还未解决。

package net2;import java.io.IOException;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;/* * 演示客户端和服务端  1，客户端：浏览器             服务端：自定义  2，客户端：浏览器             服务端：TomCat服务器 */public class ServerDemo {public static void main(String[] args) throws Exception {       ServerSocket ss=new ServerSocket(18000);       Socket s=ss.accept();            PrintWriter out=new PrintWriter(s.getOutputStream(),true);       out.println(s.getInetAddress().getHostAddress()+"<font color='red' size='7'>访问</font>");       s.close();       //ss.close();}}

获取浏览器的请求信息：





根据上面的请求消息头，可以自定义一个浏览器。

package net3;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;public class MyIE {/** * @param args * @throws IOException  * @throws UnknownHostException  */public static void main(String[] args) throws UnknownHostException, IOException {Socket s=new Socket("192.168.1.102",8080);PrintWriter out=new PrintWriter(s.getOutputStream(),true);out.println("GET /MyWeb/demo.html  HTTP/1.1");out.println("Accept: */*");out.println("Accept-Language: zh-cn");out.println("Host: 192.168.1.102:8080");out.println("Connection: Keep-Alive");out.println("");out.println("");BufferedReader bufr=new BufferedReader(new InputStreamReader(s.getInputStream()));String line=null;while((line=bufr.readLine())!=null){System.out.println(line);}s.close();}}

打印的为消息尾和网页

加上GUI

package net3;import java.awt.Button;import java.awt.Dialog;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.Label;import java.awt.TextArea;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.File;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;public class MyIEByGUI {private Frame f;private Button btn;private TextField tf;private TextArea ta;private Dialog d;private Label lab;private Button okButton;public MyIEByGUI() {init();}private void init() {f = new Frame("my frame");f.setBounds(300, 100, 600, 500);f.setLayout(new FlowLayout());btn = new Button("转到");tf = new TextField(60); // 参数为列数ta = new TextArea(15, 50); // 行，列// true--必须要等待对话框的操作才能操作其他窗口d = new Dialog(f, "提示信息：", true);d.setBounds(400, 200, 240, 150);d.setLayout(new FlowLayout());lab = new Label();okButton = new Button("确定");d.add(lab);d.add(okButton);f.add(tf);f.add(btn);f.add(ta);myEvent();f.setVisible(true);}private void myEvent() {f.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent arg0) {System.exit(0);}});// 对话框右上角的X事件d.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {d.setVisible(false);}});btn.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {try {showDir();} catch (UnknownHostException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}});//点击确定按钮或者按空格都会关闭对话框okButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {d.setVisible(false);}});//文本框的键盘监听事件tf.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {int code = e.getKeyCode();if (code == KeyEvent.VK_ENTER) {try {showDir();} catch (UnknownHostException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}});}private void showDir() throws UnknownHostException, IOException {ta.setText("");String url=tf.getText(); //http://192.168.1.102:8080/MyWeb/demo.htmlint index1=url.indexOf("//")+2;int index2=url.indexOf("/",index1);//String str=url.substring(url.indexOf("//")+2);String str=url.substring(index1,index2);String []arr=str.split(":");String host=arr[0];int port=Integer.parseInt(arr[1]);String path=url.substring(index2);Socket s=new Socket(host,port);PrintWriter out=new PrintWriter(s.getOutputStream(),true);out.println("GET "+path+"  HTTP/1.1");out.println("Accept: */*");out.println("Accept-Language: zh-cn");out.println("Host: 192.168.1.102:8080");out.println("Connection: Keep-Alive");out.println("");out.println("");BufferedReader bufr=new BufferedReader(new InputStreamReader(s.getInputStream()));String line=null;while((line=bufr.readLine())!=null){ta.append(line+"\r\n");}s.close(); }public static void main(String[] args) {new MyIEByGUI();}}

URL

package net3;import java.io.ObjectInputStream.GetField;import java.net.MalformedURLException;import java.net.URL;//封装了传输层的socket对象public class URLDemo {public static void main(String[] args) throws MalformedURLException {     URL url=new URL("http://192.168.1.102/MyWeb/demo.html?name=haha&age=20");     //获取协议     System.out.println("getProtocol():"+url.getProtocol());      //获取主机     System.out.println("getHost():"+url.getHost());     //获取端口     System.out.println("getPort():"+url.getPort());     //获取路径     System.out.println("getPath():"+url.getPath());     //获取文件名     System.out.println("getFile():"+url.getFile());     //获取查询部     System.out.println("getQuery():"+url.getQuery());     //     int port=url.getPort();//     if(port==-1)//     {//     port=80;//     }}}

URLConnection

package net3;import java.io.IOException;import java.io.InputStream;import java.net.MalformedURLException;import java.net.URL;public class URLConnection {/** * @param args * @throws IOException  */public static void main(String[] args) throws IOException {  URL url=new URL("http://192.168.1.104:8080/MyWeb/demo.html");  java.net.URLConnection  conn=url.openConnection();  InputStream in=conn.getInputStream();  byte[]buf=new byte[1024];  int len=in.read(buf);  System.out.println(new String(buf,0,len));}}

成功打开网页并去除了消息头，这是个拆包过程，看图：




所以，对IE再次修改,这是吧传输层封装后的结果，只是不能进行解析：

package net3;import java.awt.Button;import java.awt.Dialog;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.Label;import java.awt.TextArea;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.URL;import java.net.UnknownHostException;public class MyIEByGUI {private Frame f;private Button btn;private TextField tf;private TextArea ta;private Dialog d;private Label lab;private Button okButton;public MyIEByGUI() {init();}private void init() {f = new Frame("my frame");f.setBounds(300, 100, 600, 500);f.setLayout(new FlowLayout());btn = new Button("转到");tf = new TextField(60); // 参数为列数ta = new TextArea(15, 50); // 行，列// true--必须要等待对话框的操作才能操作其他窗口d = new Dialog(f, "提示信息：", true);d.setBounds(400, 200, 240, 150);d.setLayout(new FlowLayout());lab = new Label();okButton = new Button("确定");d.add(lab);d.add(okButton);f.add(tf);f.add(btn);f.add(ta);myEvent();f.setVisible(true);}private void myEvent() {f.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent arg0) {System.exit(0);}});// 对话框右上角的X事件d.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {d.setVisible(false);}});btn.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {try {showDir();} catch (UnknownHostException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}});//点击确定按钮或者按空格都会关闭对话框okButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {d.setVisible(false);}});//文本框的键盘监听事件tf.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {int code = e.getKeyCode();if (code == KeyEvent.VK_ENTER) {try {showDir();} catch (UnknownHostException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}});}private void showDir() throws UnknownHostException, IOException {ta.setText("");//String url=tf.getText(); //http://192.168.1.102:8080/MyWeb/demo.html////int index1=url.indexOf("//")+2;//int index2=url.indexOf("/",index1);////String str=url.substring(url.indexOf("//")+2);//String str=url.substring(index1,index2);//String []arr=str.split(":");//String host=arr[0];//int port=Integer.parseInt(arr[1]);//String path=url.substring(index2);////Socket s=new Socket(host,port);//PrintWriter out=new PrintWriter(s.getOutputStream(),true);//out.println("GET "+path+"  HTTP/1.1");//out.println("Accept: */*");//out.println("Accept-Language: zh-cn");//out.println("Host: 192.168.1.102:8080");//out.println("Connection: Keep-Alive");//out.println("");//out.println("");//BufferedReader bufr=new BufferedReader(new InputStreamReader(s.getInputStream()));//String line=null;//while((line=bufr.readLine())!=null)//{//ta.append(line+"\r\n");//}//s.close();  URL url=new URL("http://192.168.1.101:8080/MyWeb/demo.html");  java.net.URLConnection  conn=url.openConnection();  InputStream in=conn.getInputStream();  byte[]buf=new byte[1024];  int len=in.read(buf);  ta.setText((new String(buf,0,len)));}public static void main(String[] args) {new MyIEByGUI();}}

最后，看一下域名解析




比如需要验证更新的软件，在其要访问的软件网址改成127.0.0.1 变成本机，不让其更新。