android 反射解析xml文件成为java对象

ReflectResolveXML.java

Java代码

packagecom.player.handle;
importjava.lang.reflect.Field;
importjava.text.ParseException;
importjava.text.SimpleDateFormat;
importjava.util.Collection;
importjava.util.Date;
importjava.util.Stack;
importorg.xml.sax.Attributes;
importorg.xml.sax.SAXException;
importorg.xml.sax.helpers.DefaultHandler;
publicclassReflectResolveXMLextendsDefaultHandler{
publicstaticfinalStringT_COLLECTION="collection";
publicstaticfinalStringT_OBJECT="object";
publicstaticfinalStringT_LANG="lang";
privatestaticfinalStringT_DATE="date";
privatestaticfinalStringD_PATTERN="yyyy-MM-ddHH:mm:ss";
Stack<Object>stack=newStack<Object>();
privateObjectroot=null;
publicObjectgetRoot(){
returnroot;
}
@Override
publicvoidendElement(Stringuri,StringlocalName,StringqName)
throwsSAXException{
//System.out.println("endElement:"+uri+"localName:"+localName+"qName:"+qName);
if(qName.equals(T_OBJECT)||qName.equals(T_COLLECTION)){
//如果集合类或者object类属性注入完成则需要弹出堆栈
stack.pop();
}
}
@Override
publicvoidstartElement(Stringuri,StringlocalName,StringqName,
Attributesattributes)throwsSAXException{
//TODOAuto-generatedmethodstu
StringBufferstb=newStringBuffer();
for(inti=0;i<attributes.getLength();i++){
stb.append(attributes.getValue(i)+"---");
}
System.out.println("startElement:"+uri+"localName:"+localName+"qName:"+qName+"Attr:"+stb.toString());
//如果根元素为null则新建一个因为第一个读取的必定是根元素
Stringtype=attributes.getValue("type");
if(root==null){
root=instanceObjectByType(type);
stack.push(root);
return;
}
Stringvalue=attributes.getValue("value");
Stringname=attributes.getValue("name");
ObjectpObj=stack.peek();
//根元素不为空则根据qname判断
if(qName.equals(T_COLLECTION)||qName.equals(T_OBJECT)){
//如果是list则new一个list或者object则new出来
Objectobj=instanceObjectByType(type);
stack.push(obj);
injectToParent(pObj,obj,name);
}elseif(qName.equals(T_LANG)){
//如果是lang则需要转化value值
ObjectvalueObj=typeConvert(type,value);
injectToParent(pObj,valueObj,name);
}elseif(qName.equals(T_DATE)){
//如果是date
Stringpattern=attributes.getValue("pattern");
if(pattern==null){
pattern=D_PATTERN;
}
ObjectvalueObj=typeConvertDate(value,pattern);
injectToParent(pObj,valueObj,name);
}
}
//转化date类型
privateDatetypeConvertDate(Stringvalue,Stringpattern){
SimpleDateFormatsdf=newSimpleDateFormat(pattern);
Datedate;
try{
date=sdf.parse(value);
returndate;
}catch(ParseExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnnull;
}
//向上一级元素中注入属性或者向集合类中add子元素
privatevoidinjectToParent(ObjectpObj,ObjectfieldValue,StringfieldName){
if(pObjinstanceofCollection){
//如果上一级是集合类则需要添加进去
((Collection)pObj).add(fieldValue);
return;
}
//如果上一级是object则需要反射字段赋值
Field[]fields=pObj.getClass().getDeclaredFields();
for(Fieldfield:fields){
if(field.getName().equals(fieldName)){
try{
field.setAccessible(true);
field.set(pObj,fieldValue);
}catch(IllegalArgumentExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IllegalAccessExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
break;
}
}
}
//反射实例化对象
privateObjectinstanceObjectByType(StringqName){
try{
ClasslocalClass=Class.forName(qName);
Objectobj=localClass.getConstructor().newInstance();
returnobj;
}catch(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
thrownewRuntimeException(e);
}
}
//此方法用于将一个字符串转换为相应的数据类型
publicObjecttypeConvert(StringclassName,Stringvalue){
if(className.equals("java.lang.String")){
returnvalue;
}elseif(className.equals("java.lang.Integer")){
returnInteger.valueOf(value);
}elseif(className.equals("java.lang.Long")){
returnLong.valueOf(value);
}elseif(className.equals("java.lang.Boolean")){
returnBoolean.valueOf(value);
}elseif(className.equals("java.lang.Float")){
returnFloat.valueOf(value);
}elseif(className.equals("java.lang.Double")){
returnDouble.valueOf(value);
}else
returnnull;
}
}

reflect.xml文件

Xml代码

<?xmlversion="1.0"encoding="UTF-8"?>
<collectontype="java.util.ArrayList">
<objecttype="com.player.module.Resource">
<langtype="java.lang.String"name="id"value="0001"></lang>
<objecttype="com.player.module.Mp3"name="mp3">
<langtype="java.lang.String"name="mp3Name"value="天地初开的时候.mp3"></lang>
<langtype="java.lang.Integer"name="mp3Size"value="12333"></lang>
</object>
<objecttype="com.player.module.Lrc"name="lrc">
<langtype="java.lang.String"name="lrcName"value="天地初开的时候.lrc"></lang>
<langtype="java.lang.Integer"name="lrcSize"value="4312"></lang>
</object>
<datetype="java.util.Date"name="date"value="2001-12-1212:12:12"></date>
</object>
<objecttype="com.player.module.Resource">
<langtype="java.lang.String"name="id"value="0002"></lang>
<objecttype="com.player.module.Mp3"name="mp3">
<langtype="java.lang.String"name="mp3Name"value="那一曲盛放的玫瑰.mp3"></lang>
<langtype="java.lang.Integer"name="mp3Size"value="12333"></lang>
</object>
<objecttype="com.player.module.Lrc"name="lrc">
<langtype="java.lang.String"name="lrcName"value="那一曲盛放的玫瑰.lrc"></lang>
<langtype="java.lang.Integer"name="lrcSize"value="4312"></lang>
</object>
<datetype="java.util.Date"name="date"value="2001-12-1312:12:12"></date>
</object>
</collecton>

HandleTest.java

Java代码

packagecom.player.handle;
importjava.io.File;
importjava.io.IOException;
importjava.util.List;
importjavax.xml.parsers.ParserConfigurationException;
importjavax.xml.parsers.SAXParser;
importjavax.xml.parsers.SAXParserFactory;
importorg.junit.Test;
importorg.xml.sax.SAXException;
importcom.player.module.Resource;
publicclassHandleTest{
@Test
publicvoidtestresolveXmlTest()throwsParserConfigurationException,SAXException,IOException{
//HttpDownloaderdownloader=newHttpDownloader();
//Stringxml=downloader.download(Mp3ListActiviy.URL);
Filefile=newjava.io.File("D:\\Soft\\Program\\Apache-Tomcat-6.0.20\\webapps\\android_mp3\\reflect.xml");
SAXParsersaxParser=SAXParserFactory.newInstance().newSAXParser();
ReflectResolveXMLreflectResolveXML=newReflectResolveXML();
saxParser.parse(file,reflectResolveXML);
List<Resource>resources=(List<Resource>)reflectResolveXML.getRoot();
System.out.println("---------------------");
for(Resourceresource:resources){
System.out.println(resource.toString());
}
//mp3xmlHandle.getMp3List();
}
}

三个javabean

Java代码

publicclassLrc{
privateStringlrcName;
privateIntegerlrcSize;
}
publicclassMp3{
privateStringmp3Name;
privateintmp3Size;
}
publicclassResource{
privateStringid;
privateMp3mp3;
privateLrclrc;
privateDatedate;
}

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