andoird通过反射将xml数据映射到java类里

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();
// 定义变量保存解析结果
public HashMap<String,T> usermap = null;
// 定义XML的标签及标签属性名称
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();//通过反射获取类里面的变量
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); //给变量付值
}
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
}
//
}

}