ajax+json

来源：互联网发布：网络剧十宗罪疑点编辑：程序博客网时间：2024/05/24 03:19

<%@ page language="java" pageEncoding="utf-8"%>

function createXMLHttpRequest()
{
if(window.XMLHttpRequest)
{
  xmlrequest = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
  try
  {
   xmlrequest = new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch(e)
  {
  }
}
}

//发送请求
function myClick()
{
createXMLHttpRequest();
var param = createParam();
var uri = "servlet/Operation";
//escape()
xmlrequest.open("POST", uri, true);
xmlrequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlrequest.onreadystatechange = praseResult;
alert("begin");
xmlrequest.send(param);
}

//回调函数
function praseResult()
{
if(xmlrequest.readyState == 4)
{
  if(xmlrequest.status == 200)
  {
   var data = xmlrequest.responseText;//eval();
   document.getElementById("result").innerHTML = data;
  }
}

}
//自定义对象
function Info(funid, neid, serviceid)
{
this.funid = funid;
this.neid = neid;
this.serviceid = serviceid;
}

function createParam()
{
var funid = document.getElementById("funid").value;
var neid = document.getElementById("neid").value;
var serviceid = document.getElementById("serviceid").value;

//
var info = new Info(funid, neid, serviceid);
//alert(info.toJSONString());
return JSON.stringify(info);

//构建JSON格式的参数
//var param = {funid:"kk123", neid:"107196197", serviceid:"dbproxy"};
//alert(param);
//return param;
}

//-->
</script>

package com.huawei.usau;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONException;
import org.json.JSONObject;

public class Operation extends HttpServlet {

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  JSONObject jsonObject = null;
  String responseText = null;
  String json = readJSONString(request);

  try
  {
   jsonObject = new JSONObject(json);
   //jsonObject = JSONObject.fromObject(json);
   responseText = "账号 " + jsonObject.getString("funid") + " 名称 " + jsonObject.getString("neid") + " 余额 " + jsonObject.getString("serviceid");

  }
  catch (JSONException e)
  {
   e.printStackTrace();
  }
  response.setCharacterEncoding("UTF-8");
  response.setContentType("text/xml");

  PrintWriter out = response.getWriter();
  out.print(responseText);
  out.flush();
  out.close();

  /*//////////////////////////////////////////////////////
  String param = (String) request.getParameter("param");
  JSONObject jSONObject = new JSONObject();

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  out.print("    This is ");
  out.print(this.getClass());
  out.println(param);
  out.println(", using the POST method");
  //out.println(param);
  out.flush();
  out.close();
  */
}

/**
* 获取客户端传递过来的JSON数据
* @param request
* @return
*/
private String readJSONString(HttpServletRequest request)
{
StringBuffer json = new StringBuffer();
String line = null;

  try
  {
   BufferedReader reader = request.getReader();
   while((line = reader.readLine()) != null)
   {
    json.append(line);
   }
  }
  catch(Exception e)
  {
   System.out.println(e.toString());
  }

return json.toString();
}

}