andoird通過反射將xml數據映射到java類裏

主界面很簡單  封裝的幫助類傳入需要反射的類名 以及xml中的其它參數 得到一個實例化的對象

接下來看看xmlutils

最後主要的邏輯 寫在XMLParaserUtil裏的：

package com.example.tempand;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.lang.reflect.Field;
import java.util.HashMap;

public  class XMLParserUtil<T> extends DefaultHandler{
   private StringBuilder text = new StringBuilder();  
   // 定義變量保存解析結果  
     public HashMap<String,T> usermap = null;
   // 定義XML的標籤及標籤屬性名稱  
     public  String SAX_ROOT = "config";

     public  String SAX_LOTTERY = "item";
   private final Field[] fields;
   private Class<T> data;
   private String index;
    XMLParserUtil(String index, Class<T> t, String nodename, String rootnode){
      fields =t.getDeclaredFields();//通過反射獲取類裏面的變量
      this.data=t;
      this.index=index;
      this.SAX_ROOT=rootnode;
      this.SAX_LOTTERY=nodename;

   }
   public HashMap<String,T> getUsermap(){
      return  usermap;
   }
   @Override
   public void startDocument() throws SAXException {
      // TODO Auto-generated method stub  super.startDocument();
   }
   @Override
   public void endDocument() throws SAXException {
      // TODO Auto-generated method stub  super.endDocument();
   }
   @Override
   public void startElement(String uri, String localName, String qName,
         Attributes attributes) throws SAXException {
      // TODO Auto-generated method stub  super.startElement(uri, localName, qName, attributes);
       if (localName.equalsIgnoreCase(SAX_ROOT)) {// 根元素  
             if (null == usermap) {
                usermap = new HashMap<String, T>();
             } else {  
                usermap.clear();  
             }  
         }
         else if (localName.equalsIgnoreCase(SAX_LOTTERY)) {
          try {
             T obj = data.newInstance();
             for (int i = 0; i < fields.length; i++) {
                fields[i].getName();
                String value = attributes.getValue(fields[i].getName());
                fields[i].setAccessible(true);
                if (null!=value&&!"".equals(value))
                fields[i].set(obj,value); //給變量付值
             }
             usermap.put(attributes.getValue(index),obj);
          } catch (InstantiationException e) {
             e.printStackTrace();
          } catch (IllegalAccessException e) {
             e.printStackTrace();
          }

       }
         else {  
             // Nothing to do ...  
         }  
   }
   @Override
   public void characters(char[] ch, int start, int length)
         throws SAXException {
      // TODO Auto-generated method stub  super.characters(ch, start, length);
       text.setLength(0);  
         text.append(String.valueOf(ch, start, length)); 
   }
   @Override
   public void endElement(String uri, String localName, String qName)
         throws SAXException {
      // TODO Auto-generated method stub  super.endElement(uri, localName, qName);
      if (localName.equalsIgnoreCase(SAX_ROOT)) {// 根元素  
            //nothing
         }
//
}

}