REST的架构设计与实现

/*
 * 函数名:getTransport
 * 功能: 根据不同的浏览器对象创建 XMLHttpRequest对象并返回，如果浏览器不支持该对象，则返回undefined.
 */
 function getHttpRequest() 
 {
   var xmlhttp;
   try
   {
    xmlhttp=new ActiveXObject('Msxml2.XMLHTTP');
   }
   catch(e)
   {
        try
          {
                xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
          }
          catch(e1)
          {
              xmlhttp=new XMLHttpRequest();
          }
       
   }
    return xmlhttp;
 }
 
function httpGet(url,method,data)
{
 var httpget=null;
 var xmlhttp=getHttpRequest();
 xmlhttp.open(method,url +"?"+data,false);
 xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
 xmlhttp.setRequestHeader("Content-Length",data.length);
 xmlhttp.send (null);
 if (xmlhttp.readyState==4) 
 {  
     
     if(xmlhttp.Status ==200)
     {httpget=xmlhttp.responseText;
     
     }
     else
     {
         httpget="error";
     }
     xmlhttp =null;
 }

 return httpget;
}
 
function httpPut(url, method, data){
    var httpget=null;
     var xmlhttp=getHttpRequest();
     xmlhttp.open(method,url,false);
     xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     xmlhttp.setRequestHeader("Content-Length", data.length);
     xmlhttp.send(data);
     if (xmlhttp.readyState==4) 
     {  
         if(xmlhttp.Status >=400 && xmlhttp.Status <=599)
         httpget="Error Occurred : "& xmlhttp.Status & "-" & xmlhttp.statusText;
         else
         httpget=xmlhttp.responseText;         
         xmlhttp =null;
     }
     return httpget;    
}
 

function  httpPost(url, method, data){
    var httpget=null;
     var xmlhttp=getHttpRequest();
     xmlhttp.open(method, url,false);
     xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     xmlhttp.setRequestHeader("Content-Length",data.length);
     xmlhttp.send(data);                                                                                       
     if (xmlhttp.readyState==4) 
     {  
         if(xmlhttp.Status ==200)
         {
             httpget=xmlhttp.responseText;
         }
         else
         {
             httpget="error";
         }
         xmlhttp=null;
     }
     
     return httpget;
}


function httpDelete(url, method, data){
    var httpget=null;
     var xmlhttp=getHttpRequest();
     xmlhttp.open(method, url + "?" + data,false);
     xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     xmlhttp.setRequestHeader("Content-Length", data.length);
     xmlhttp.send(null);
     if (xmlhttp.readyState==4) 
     {  
         if(xmlhttp.Status >=400 && xmlhttp.Status <=599)
         httpget="Error Occurred : "& xmlhttp.Status & "-" & xmlhttp.statusText;
         else
         httpget=xmlhttp.responseText;         
         xmlhttp =null;
     }
     return httpget;    
}

<%@ page language="java" cOntentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
id="WebApp_ID" 
version="3.0">
<servlet>
        <servlet-name>HandleRestServletservlet-name>
        <servlet-class>com.my.RestServletservlet-class>
servlet>
<servlet-mapping>
<servlet-name>HandleRestServletservlet-name>
<url-pattern>/handlerestquesturl-pattern>
    servlet-mapping>
web-app>

package com.my;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class RestServlet extends HttpServlet 
{
 public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException
 { 
   //指定 去除客户端页面的缓存
    //指定 去除客户端页面的缓存
       ClearCache(response);
   request.setCharacterEncoding("utf-8");
   String operation=new String((request.getParameter("do")).getBytes("iso-8859-1"));
   response.setContentType("text/html");
   response.setCharacterEncoding("utf-8");
   PrintWriter out=response.getWriter();
   out.println(operation+"
");
   System.out.println(operation);
   out.flush(); 
   out.close();
  }
 
 public void doPut(HttpServletRequest request,HttpServletResponse response)
 throws ServletException, IOException
 {     
    //指定 去除客户端页面的缓存
       ClearCache(response);
     
     BufferedReader sis = request.getReader(); 
     String operation1=new String(sis.readLine().getBytes("iso-8859-1"),"utf-8");
     System.out.println(operation1);   //sb为POST过来的数据
     response.setContentType("text/html");
     response.setCharacterEncoding("utf-8");
     PrintWriter out=response.getWriter();
     out.println(operation1+"
");
     out.flush(); 
     out.close();
 }
 
 public void doPost(HttpServletRequest request,HttpServletResponse response)
 throws ServletException, IOException
 {
     
     //指定 去除客户端页面的缓存
       ClearCache(response);
       
       String operation=new String(request.getParameter("do").getBytes("iso-8859-1"),"utf-8");
       response.setContentType("text/html");
       response.setCharacterEncoding("utf-8");
       PrintWriter out=response.getWriter();
       out.println(operation+"
");
       System.out.println(operation);
       out.flush(); 
       out.close();
 }
 
 public void doDelete(HttpServletRequest request,HttpServletResponse response)
 throws ServletException, IOException
 {
  doGet(request,response);
 }
 
 public void ClearCache(HttpServletResponse response)
 {
    //指定 去除客户端页面的缓存
    response.setHeader("pragma", "no-cache");
    response.setHeader("cache-control", "no-cache");
    response.setHeader("expires", "0"); 
 }
}