ajax中如何读取前台传到后台的xml

最新推荐文章于 2021-02-24 15:50:33 发布

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最新推荐文章于 2021-02-24 15:50:33 发布

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分类专栏： Javascript代码

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本文介绍了一个前端页面如何将用户输入的数据转换为XML格式，并通过XMLHttpRequest发送到后台Servlet进行解析和处理。Servlet使用DocumentBuilderFactory解析XML，获取用户信息并返回相应的响应。

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//创建xmlrequest对象

function newxmlreq(){
	var xmlreq=false;
	
	if(window.XMLHttpRequest){
		xmlreq=new XMLHttpRequest();
	}else if(window.ActrveXObject){
		try {
			xmlreq=new ActrveXObject("Msxml.XMLHTTP");
		}catch(e1){
			try{
			xmlreq=new ActrveXObject("Microsoft.XMLHTTP")
			}catch (e2){
				xmlreq=false;
			}
		}	
	}
	      return xmlreq;
}

//前台代码把xml转换成字符串传到后台

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>往后台发送xml</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <form> 
      收件人：<input type="text" id="name" name="name"/><br/>
      地址：<input type="text" id="ad"/><br/>
      邮编：<input type="text" id="yb"><br/>
      <input type="button"  value ="提交"  onclick="xmltoh()"/><br/>
      <span id="sd"></span>
    </form>
    <script type="text/javascript" src="js/newXmlReq.js"></script>
    <script type="text/javascript">
    
        function toxml(){
          var name=document.getElementById("name").value;
          var ad=document.getElementById("ad").value;
          var yb=document.getElementById("yb").value;
           var xml=null;
          if(name!=""&&ad!=""&&yb!=""){
          var xml="<file>"+"<name>"+name+"</name>"+"<ad>"+ad+"</ad>"+"<yb>"+yb+"</yb>"+"</file>";
              }else{
                alert("输入值不能为空");
                }
          return xml;
        }
        
       function xmltoh(){
       
         var xml=toxml();
         var xmlreq=newxmlreq();
         xmlreq.onreadystatechange=function (){
            if(xmlreq.readyState==4){
               if (xmlreq.status==200){
                    var text=xmlreq.responseText;
                    var sd=document.getElementById("sd");
                    sd.innerHTML=text;
                    
               }
            }
          }
          
          xmlreq.open("post","XmlTOHServlet",true);
          xmlreq.setRequestHeader("Content-Type","text/xml");
          xmlreq.send(xml);
       }
    </script>
  </body>
</html>

//主要通过流来读取出数据通过dom工厂创建dom对象来解析xml字符串

package com.ajax.servlet;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
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.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.xml.sax.SAXException;

public class XmlTOHServlet extends HttpServlet {

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");

        StringBuffer bxml = new StringBuffer();

        String line = null;
       //从获得请求中的数据流
        try {
              BufferedReader reader = request.getReader();
              while((line = reader.readLine()) != null) {
                   bxml.append(line);
              }
         }
         catch(Exception e) {
              System.out.println(e.toString());
         }
         
         String xml =bxml.toString();
         
         Document xmlDoc = null;
         try {
        	 
               xmlDoc = DocumentBuilderFactory.newInstance()
               .newDocumentBuilder()
               .parse(new ByteArrayInputStream(xml.getBytes()));
              
         }
         catch(ParserConfigurationException e) {
              System.out.println(e.getStackTrace());
         }
         catch(SAXException e) {
              System.out.println( e);
         }


		String uname = xmlDoc.getElementsByTagName("name").item(0).getFirstChild().getNodeValue();
		String city = xmlDoc.getElementsByTagName("ad").item(0).getFirstChild().getNodeValue();
		String street =  xmlDoc.getElementsByTagName("yb").item(0).getFirstChild().getNodeValue();
	
 		String responseText = "您发送给"+uname+"地址是"+city+"邮编是"+street+"邮件，还需要一天到达目的地！";
 		
		response.setContentType("text/xml; charset=UTF-8");
		response.setHeader("Cache-Control", "no-cache");
		PrintWriter out = response.getWriter();
		out.println(responseText);
		
		out.close();
	}

}