请求参数作为xml发送

2022-07-15 80酷酷网 80kuku.com

　　xml|请求业务逻辑：下拉框选择喜欢的宠物类型，可多选，选择参数构造成xml参数发送。服务器发回响应结果。

页面：postingXML.html

<% page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
发送XML请求
</title>
<script type="text/javascript">
//xmlHttpRequest对象
var xmlHttp;

        //创建xmlHttpRequest对象
        function createXMLHttpRequest(){
        if (window.ActiveXObject){
          xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                else if(window.XMLHttpRequest){
                xmlHttp = new XMLHttpRequest();
                }
        }

        //创建xml字串
        function createXML(){
          var xml = "<pets>"
          var options = document.getElementById("petTypes").childNodes;
          var option = null;
          for (var i = 0; i < options.length; i++){
          option = options[i];
                if (option.selected){
                xml = xml + "<type>" + option.value + "<\/type>";
                }
          }

          xml = xml + "<\/pets>";
          return xml;
        }

        //发送宠物类型请求
        function sendPetTypes(){
        createXMLHttpRequest();

                var xml = createXML();
  //处理方法
                var url = "postingxmlexample?timeStamp=" + new Date().getTime();

                xmlHttp.open("POST",url,true);
                xmlHttp.onreadystatechange = handleStateChange;
                //设置请求头格式
                xmlHttp.setRequestHeader("Conteyt-Type","application/x-www-form-urlencoded;");
                xmlHttp.send(xml);
        }

        //回调方法
        function handleStateChange(){
        if (xmlHttp.readyState == 4){
          if (xmlHttp.status == 200){
                          //解析返回结果
           parseResults();
                        }
                }
        }

        //解析返回结果
        function parseResults(){
          var responseDiv = document.getElementById("serverResponse");
          if (responseDiv.hasChildNodes()){
          responseDiv.removeChild(responseDiv.childNodes[0]);
          }
          //返回文本构造一个文本节点
          var responseText = document.createTextNode(xmlHttp.responseText);
          responseDiv.appendChild(responseText);
        }
</script>
</head>
<body bgcolor="#ffffff">
<h1>
请选择家中宠物的类型：
</h1>
<form action="#">
<select id="petTypes" size="6" multiple="multiple">
    <option value="cats">猫</option>
    <option value="dogs">狗</option>
    <option value="fish">鱼</option>
    <option value="birds">鸟</option>
    <option value="hamsters">鼠</option>
    <option value="rabbits">兔</option>
</select>

<br /><br />
<input type="button" value="提交" />
</form>

<h2>服务器端响应：
</h2>
<div id="serverResponse">
</div>
</body>
</html>

服务器端

PostingXMLExample.java

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

import org.w3c.dom.*;

public class PostingXMLExample
extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";

//Initialize global variables
public void init() throws ServletException {
}

//处理Post请求
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    //得到请求的xml字串
    String xml = readXMLFromRequestBody(request);
    Document xmlDoc = null;
    try {
      xmlDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new ByteArrayInputStream(xml.getBytes()));
    }
    catch (Exception ex) {
      System.out.println("解析XML异常...");
    }

    //得到类型节点列表
    NodeList selectedPetTypes = xmlDoc.getElementsByTagName("type");
    String type = null;
    String responseText = "选择的宠物是:";
    for (int i = 0; i < selectedPetTypes.getLength(); i++){
      type = selectedPetTypes.item(i).getFirstChild().getNodeValue();
      responseText = responseText + " " + type;
    }

    response.setContentType(CONTENT_TYPE);
    response.getWriter().print(responseText);
}

/**
   * readXMLFromRequestBody
   *
   * param request HttpServletRequest
   * return String
   */
private String readXMLFromRequestBody(HttpServletRequest request) {
    StringBuffer xml = new StringBuffer();
    String line = null;
    try {
      BufferedReader reader = request.getReader();
      while((line = reader.readLine()) != null){
        xml.append(line);
      }
    }
    catch (Exception ex) {
      System.out.println("读取xml错误:" + ex.getMessage());
    }
    return xml.toString();
}

//Clean up resources
public void destroy() {
}
}