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JSP实现HTTP隧道

添加时间:2013-12-6
    相关阅读: JSP

共有两个java类和一个servlet(在同一个java包JavaSerializable中):

java:StudentList  StudentListTunnetApp(客户端)

servlet:StudentListTunnetServlet(服务器端)


StudentList(java类)定义一个类,StudentListTunnetApp(java类)运行在客户端,实例化一个StudentList对象并将其写到与StudentListTunnetServlet连接的HTTP中,然后发送请求到服务器端StudentListTunnetServlet(servlet)读取先前写入连接的StudentList对象


1.StudentList.java:


/**
 *
 * @author lucifer
 */


package JavaSerializable;

import java.util.*;
import java.io.*;

public class StudentList implements Serializable{
   Vector list = new Vector(6);

public StudentList(){}

public void addStudent(String name){
      if(name != null)
        list.addElement(name);
   }

public void listStudent(){
      for(int i = 0;i < list.size();i++){
        System.out.PRintln("Student" + i + ":" + (String)list.elementAt( i ));
      }
   }
}


2.StudentListTunnetApp.java:


/**
 *
 * @author lucifer
 */


package JavaSerializable;

import java.io.*;
import java.net.*;


public class StudentListTunnetApp {

public StudentListTunnetApp(){}

public void buildStudentList(StudentList list){
      list.addStudent("Bob Robinson");
      list.addStudent("Steve Robinson");
      list.addStudent("Rob Stevinson");
      list.addStudent("Tod Thomson");
      list.addStudent("Jack Jones");
      list.addStudent("Micheal Jackson");
   }

public void writeStudentList(URLConnection connection,StudentList list){
      try{

      //ignore caching
        connection.setUseCaches(false);           
          connection.setRequestProperty("CONTENT_TYPE","application/octet-stream");

        //使得发送和接收能使用用一个连接
          connection.setDoInput(true);             
          connection.setDoOutput(true);

      ObjectOutputStream os = new ObjectOutputStream(connection.getOutputStream());
        System.err.println("Writing an object.");
        os.writeObject( list );
        os.flush();
        os.close();
      }
      catch(IOException e){
        System.err.println(e.getMessage());
      }
   }

public StudentList readStudentList(URLConnection connection){
      StudentList list = null;
      try{
        ObjectInputStream is = new ObjectInputStream(connection.getInputStream());
        System.err.println("Waiting for response.");
        list = (StudentList)is.readObject();
        is.close();
      }
      catch(IOException e){
        System.err.println(e.getMessage());
      }
      catch(ClassNotFoundException e){
        System.err.println(e.getMessage());
      }
      return list;
   }

public void invoke(){
      try{
        URL url = new URL("");
        StudentList list = new StudentList();
        buildStudentList(list);
        list.listStudent();
        System.err.println("Opening an connection.");
        URLConnection connection = url.openConnection();

      writeStudentList(connection,list);

      StudentList inlist = readStudentList(connection);
        if(inlist != null){
           inlist.listStudent();
        }
        else{
           System.err.println("readObject failed.");
        }
        System.out.println("press enter to quit.");
        System.in.read();
      }
      catch(MalformedURLException e){
        System.err.println(e.getMessage());
      }
      catch(Exception e){
        System.err.println(e.getMessage());
      }
   }

public static void main(String[] args){
      StudentListTunnetApp studentlist = new StudentListTunnetApp();
      studentlist.invoke();
   }
}


3.StudentListTunnetServlet.java(servlet):


/**
 *
 * @author lucifer
 */


package JavaSerializable;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class StudentListTunnetServlet extends HttpServlet {
 
   protected void processRequest(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     response.setContentType("text/html;charset=UTF-8");
     PrintWriter out = response.getWriter();
     try {
       /* TODO output your page here
       out.println("<html>");
       out.println("<head>");
       out.println("<title>Servlet StudentListTunnetServlet</title>"); 
       out.println("</head>");
       out.println("<body>");
       out.println("<h1>Servlet StudentListTunnetServlet at " + request.getContextPath () + "</h1>");
       out.println("</body>");
       out.println("</html>");
       */
     } finally {
       out.close();
     }
   }

   @Override

   //用的是这个方法
   public void service (HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
     try{
        ObjectInputStream ois = new ObjectInputStream(request.getInputStream());
        StudentList list = (StudentList)ois.readObject();
        response.setContentType("application/octet-stream");

      ObjectOutputStream oos = new ObjectOutputStream(response.getOutputStream());
        oos.writeObject(list);
        oos.flush();
        oos.close();
     }
     catch(ClassNotFoundException e){
        System.err.println(e.getMessage());
     }
   }

   @Override
   public void init(ServletConfig config)throws ServletException{
     super.init(config);
   }

   @Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     processRequest(request, response);
   }

   @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
     processRequest(request, response);
   }

   @Override
   public String getServletInfo() {
     return "Short description";
   }

}

 

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