Ajax 从servlet中读取xml数据

来源：互联网发布：光海王的男人知乎编辑：程序博客网时间：2024/05/20 03:43

文件： XMLservlet.java

package servlet;

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 javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class XMLServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

   String CONTENT_TYPE = "text/xml; charset=gb2312";
   response.setContentType(CONTENT_TYPE);
   PrintWriter out = response.getWriter();
   StringBuffer sb = new StringBuffer("<address>");
   sb.append("<type_name>AAhl</type_name>");
   sb.append("<type_name>BB</type_name>");
   sb.append("<type_name>CC</type_name>");
   sb.append("<type_name>DD</type_name>");
   sb.append("</address>");
   out.write(sb.toString());
   out.close();


}

}

///////////////////////////

读取XMLservlet.java发送的 xml文件的 myAjax.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<html>
<head>
<script language="javascript">
var xmlHttp;
  function createXMLHttp(){
   if(window.XMLHttpRequest){
    xmlHttp = new XMLHttpRequest();
   }else{
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
   }
  }
  //到这里都是为了获取得到XMLHttpRequest对象

  function getInfo(){
   createXMLHttp();
   xmlHttp.open("POST", "servlet/XMLServlet");   //建立到服务器的数据请求，这里请求一个名为“allarea.xml”文件
   xmlHttp.onreadystatechange = getCityCallback ;   //一个回调函数
   xmlHttp.send(null);  //想服务器发送的数据
  }

  function getCityCallback(){

   if(xmlHttp.readyState == 4 ){
    if(xmlHttp.status == 200){ //这里的俩个if语句是为了判断请求是否已经完成

    var allareaHLp = xmlHttp.responseText;
    alert(allareaHLp);
     var type = xmlHttp.responseXML.getElementsByTagName("type_name");
     alert("---------");
    var str=new Array();
        for(var i=0;i<type.length;i++){
      str[i]=type[i].firstChild.data;
      alert(str[i]);
         document.all['td'].innerHTML+=str[i]+"<BR>";
      }
    }
   }
  }

</script>
</head>

<body onload = "getInfo()">

<table width="80%" border="0" cellspacing="0" cellpadding="0">
   <tr>
    <td id="td">
    </td>
   </tr>
</table>

</body>
</html>

关键是在servlet中生成 xml文件数据