Android - 如何在XML中处理Webservice？

Question

我有一个示例XML文件,如下所示:

 <?xml version="1.0"?>
  <h:html xmlns="http://www.w3.org/2002/xforms" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:h="http://www.w3.org/1999/xhtml" xmlns:jr="http://openrosa.org/javarosa" xmlns:orx="http://openrosa.org/xforms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <h:head>
<h:title>tutorial</h:title>
<model>
  <instance>
    <tutorial id="tutorial">
      <name/>
      <age/>
      <gender/>
      <photo/>
      <date/>
      <location/>
      <thanks/>
      <start/>
      <end/>
      <today/>
      <deviceid/>
      <subscriberid/>
      <simserial/>
      <phonenumber/>
      <meta>
        <instanceID/>
      </meta>
    </tutorial>
  </instance>
  <bind nodeset="/tutorial/name" required="true()" type="string"/>
  <bind constraint=". &gt; 0 and . &lt; 120" jr:constraintMsg="That's not a valid age!" nodeset="/tutorial/age" required="true()" type="int"/>
  <bind nodeset="/tutorial/gender" type="select1"/>
  <bind nodeset="/tutorial/photo" type="binary"/>
  <bind nodeset="/tutorial/date" type="date"/>
  <bind nodeset="/tutorial/location" type="geopoint"/>
  <bind nodeset="/tutorial/thanks" readonly="true()" type="string"/>
  <bind jr:preload="timestamp" jr:preloadParams="start" nodeset="/tutorial/start" type="dateTime"/>
  <bind jr:preload="timestamp" jr:preloadParams="end" nodeset="/tutorial/end" type="dateTime"/>
  <bind jr:preload="date" jr:preloadParams="today" nodeset="/tutorial/today" type="date"/>
  <bind jr:preload="property" jr:preloadParams="deviceid" nodeset="/tutorial/deviceid" type="string"/>
  <bind jr:preload="property" jr:preloadParams="subscriberid" nodeset="/tutorial/subscriberid" type="string"/>
  <bind jr:preload="property" jr:preloadParams="deviceid" nodeset="/tutorial/simserial" type="string"/>
  <bind jr:preload="property" jr:preloadParams="phonenumber" nodeset="/tutorial/phonenumber" type="string"/>
  <bind calculate="concat('uuid:', uuid())" nodeset="/tutorial/meta/instanceID" readonly="true()" type="string"/>
</model>
</h:head>
<h:body>
<input ref="/tutorial/name">
  <label>What's your name?</label>
</input>
<input ref="/tutorial/age">
  <label>How old are you?</label>
</input>
<select1 ref="/tutorial/gender">
  <label>Gender</label>
  <item>
    <label>Male</label>
    <value>male</value>
  </item>
  <item>
    <label>Female</label>
    <value>female</value>
  </item>
</select1>
<upload mediatype="image/*" ref="/tutorial/photo">
  <label>Please Take a picture</label>
</upload>
<input ref="/tutorial/date">
  <label>Date</label>
</input>
<input ref="/tutorial/location">
  <label>Where are you?</label>
  <hint>You need to be outside for your GPS to work.</hint>
</input>
<input ref="/tutorial/thanks">
  <label>Thanks for your time <output value="/tutorial/name"/>!</label>
</input>
</h:body>
</h:html>

现在我想填写<input ref="/tutorial/name">作为Web服务响应的数据？我有一个正确提供响应的Web服务.请帮我....

Answer 1

要替换<input ref="/tutorial/name">标签.你必须遵循这三个步骤.

1)<input ref="/tutorial/name">在XML文件中查找TAG.

2)更新,删除,替换您想要的任何功能.

3)将内容写入XML文件

第1步:查找节点:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder db = factory.newDocumentBuilder();
Document dom = db.parse(FILE);
Element root = dom.getDocumentElement();

//get node-list,
NodeList inputNodeList = root.getElementsByTagName("input");

//iterate over all input node to find the desired one.
for(int i=0;i<inputNodeList.length();i++){
  Node inputNode = inputNodeList.item(i); //get a single node.
  String refStr = inputNode.getAttributes().getNamedItem("ref").getNodeValue();
  if(refStr.compareTo("/tutorial/name")==0){

     // Bingo, You have find the NODE. Now you can do any operations like delete, edit whatever you want.
   }
}

第2步:更换操作.

您可以使用删除节点.

inputNode.getParentNode().removeChild(inputNode);

如果要替换节点,请查看replaceChild()方法.

基本的想法是,

• 从响应字符串创建节点.请参阅此链接以从字符串创建xml节点.
• 使用inputNode.getParentNode()查找inputNode的父级.
• 使用replaceChild()方法将旧节点替换为新节点.

有关replaceChild()方法的示例,您可以参考此链接.这是一个使用DOM解析器修改XML文件的好教程 - TUTORIAL.

第3步:将内容写入XML文件.

TransformerFactory transformerFactory = TransformerFactory.newInstance();  
Transformer transformer = transformerFactory.newTransformer();   
DOMSource source = new DOMSource(doc);   
StreamResult result = new StreamResult(selectedFile); 
transformer.transform(source, result); 

希望,这会给你一些关于实现你想要的任务的暗示.