自己写的一个Java Bean转换为HashMap及ArrayList容器的功能类，支持Hibernate

XStream转换Object生成类结构垃圾数据太多了，影响网络，仿照之前的JSON工具类的写法，自己又写了个转换到仅HashMap和ArrayList容器的类来做一下处理。

思路主要就是把Bean的成员转换到HashMap，而Colecction和数组类型转换到ArrayList。这下除了原始类型外，就只包含HashMap和ArrayList两个JAVA类了。

这样做转换处理后，再用XStream做一下转换成的数据。。。哇，这下世界清洁多了:)

packagecom.aherp.framework.util;

importjava.lang.reflect.Array;
importjava.lang.reflect.Method;
importjava.util.ArrayList;
importjava.util.Collection;
importjava.util.HashMap;
importjava.util.Iterator;
importjava.util.Map;

importorg.json.JSONException;

/***//**
*转换工具类，支持反射的方式将对象转换为Map，将数组和Collection转换为List供XStrem使用
*@authorJimWu
*
*/
publicclassObjMapListUtil...{

privatestaticObjMapListUtilinstance=null;

staticpublicObjecttoHashMap(Objectobj)throwsJSONException...{
returntoHashMap(obj,false);
}

staticpublicObjecttoHashMap(Objectobj,booleanuseClassConvert)throwsJSONException...{
if(instance==null)
instance=newObjMapListUtil();
returninstance.getMapListObject(obj,useClassConvert);
}

/***//**
*代理类是否输出的检查，返回true则允许继续转换
*@parambean
*@return
*/
protectedbooleancanProxyOutput(Objectbean)...{
returntrue;
}

/***//**
*代理类时做的检查.返回应该检查的对象.
*@parambean
*@return
*/
protectedObjectproxyConvert(Objectbean)...{
returnbean;
}

publicObjectgetMapListObject(Objectbean,booleanuseClassConvert)...{

if(bean==null)
returnnull;
bean=proxyConvert(bean);
Classclazz=bean.getClass();
if(beaninstanceofNumber||beaninstanceofBoolean||beaninstanceofString)...{
returnbean;
}
if(clazz.isArray())...{

ArrayList<Object>arrayList=newArrayList<Object>();

intarrayLength=Array.getLength(bean);
for(inti=0;i<arrayLength;i++)...{
ObjectrowObj=Array.get(bean,i);
if(canProxyOutput(rowObj))
arrayList.add(getMapListObject(rowObj,useClassConvert));
}
returnarrayList;
}
if(beaninstanceofCollection)...{

ArrayList<Object>arrayList=newArrayList<Object>();

Iteratoriterator=((Collection)bean).iterator();
while(iterator.hasNext())...{
ObjectrowObj=iterator.next();
if(canProxyOutput(rowObj))
arrayList.add(getMapListObject(rowObj,useClassConvert));
}
returnarrayList;
}
if(beaninstanceofMap)...{
HashMap<String,Object>beanMap=newHashMap<String,Object>();

Mapmap=(Map)bean;
Iteratoriterator=map.keySet().iterator();
while(iterator.hasNext())...{
Objectkey=iterator.next();
ObjectrowObj=map.get(key);
if(canProxyOutput(rowObj))
beanMap.put(key.toString(),getMapListObject(rowObj,useClassConvert));
}
returnbeanMap;
}

HashMap<String,Object>beanMap=newHashMap<String,Object>();
Classklass=bean.getClass();
Method[]methods=klass.getMethods();
for(inti=0;i<methods.length;i++)...{
try...{
Methodmethod=methods[i];
Stringname=method.getName();
Stringkey="";
if(name.startsWith("get"))...{
key=name.substring(3);
}elseif(name.startsWith("is"))...{
key=name.substring(2);
}
if(key.length()>0&&
Character.isUpperCase(key.charAt(0))&&
method.getParameterTypes().length==0)...{
if(key.length()==1)...{
key=key.toLowerCase();
}elseif(!Character.isUpperCase(key.charAt(1)))...{
key=key.substring(0,1).toLowerCase()+
key.substring(1);
}
ObjectelementObj=method.invoke(bean);
if(elementObjinstanceofClass)...{
if(useClassConvert)
beanMap.put(key,elementObj.toString());
}
else...{
if(canProxyOutput(elementObj))
beanMap.put(key,getMapListObject(elementObj,useClassConvert));
}
}
}catch(Exceptione)...{
/**//*forgetaboutit*/
}
}
returnbeanMap;
}


}

支持Hibernate的类则继承一下，覆盖proxyConvert和canProxyOutput方法

packagecom.aherp.framework.util;

importorg.hibernate.collection.PersistentSet;
importorg.hibernate.proxy.HibernateProxy;
importorg.hibernate.proxy.LazyInitializer;
importorg.json.JSONException;

/***//**
*扩展为支持Hibernate的工具方法.
*@authorJimWu
*
*/
publicclassHiObjMapListUtilextendsObjMapListUtil...{

privatestaticHiObjMapListUtilinstance=null;

staticpublicObjecttoHashMap(Objectobj)throwsJSONException...{
returntoHashMap(obj,false);
}

staticpublicObjecttoHashMap(Objectobj,booleanuseClassConvert)throwsJSONException...{
if(instance==null)
instance=newHiObjMapListUtil();
returninstance.getMapListObject(obj,useClassConvert);
}

@Override
protectedObjectproxyConvert(Objectbean)...{
if(beaninstanceofHibernateProxy)...{
LazyInitializerlazyInitializer=((HibernateProxy)bean).getHibernateLazyInitializer();
if(lazyInitializer.isUninitialized())...{
returnlazyInitializer.getIdentifier();
}else
returnlazyInitializer.getImplementation();
}
if(beaninstanceofPersistentSet)...{
returnnewString[]...{};//忽略hibernateone-to-many
}
returnbean;
}

@Override
protectedbooleancanProxyOutput(Objectbean)...{
return!(bean!=null&&beaninstanceofPersistentSet);
}
}

P.S.发现Hibernate Session的get方法拿到的对象仅填充了一个OID而已，需要Hibernate.initialize才能继续拿到整个实体的数据。这样XStream转换才正确，否则就是一个仅OID的List而已了