java操作mongodb时,对象bean和DBObject相互转换的方法(推荐)
如下所示：
packagecom.iqbon.spider.util;
importjava.lang.reflect.Field;
importjava.lang.reflect.InvocationTargetException;
importjava.util.Date;
importorg.apache.commons.beanutils.BeanUtils;
importcom.mongodb.BasicDBObject;
importcom.mongodb.DBObject;
publicclassBeanUtil{
/**
*把实体bean对象转换成DBObject
*@parambean
*@return
*@throwsIllegalArgumentException
*@throwsIllegalAccessException
*/
publicstatic<T>DBObjectbean2DBObject(Tbean)throwsIllegalArgumentException,
IllegalAccessException{
if(bean==null){
returnnull;
}
DBObjectdbObject=newBasicDBObject();
//获取对象对应类中的所有属性域
Field[]fields=bean.getClass().getDeclaredFields();
for(Fieldfield:fields){
//获取属性名
StringvarName=field.getName();
//修改访问控制权限
booleanaccessFlag=field.isAccessible();
if(!accessFlag){
field.setAccessible(true);
}
Objectparam=field.get(bean);
if(param==null){
continue;
}elseif(paraminstanceofInteger){//判断变量的类型
intvalue=((Integer)param).intValue();
dbObject.put(varName,value);
}elseif(paraminstanceofString){
Stringvalue=(String)param;
dbObject.put(varName,value);
}elseif(paraminstanceofDouble){
doublevalue=((Double)param).doubleValue();
dbObject.put(varName,value);
}elseif(paraminstanceofFloat){
floatvalue=((Float)param).floatValue();
dbObject.put(varName,value);
}elseif(paraminstanceofLong){
longvalue=((Long)param).longValue();
dbObject.put(varName,value);
}elseif(paraminstanceofBoolean){
booleanvalue=((Boolean)param).booleanValue();
dbObject.put(varName,value);
}elseif(paraminstanceofDate){
Datevalue=(Date)param;
dbObject.put(varName,value);
}
//恢复访问控制权限
field.setAccessible(accessFlag);
}
returndbObject;
}
/**
*把DBObject转换成bean对象
*@paramdbObject
*@parambean
*@return
*@throwsIllegalAccessException
*@throwsInvocationTargetException
*@throwsNoSuchMethodException
*/
publicstatic<T>TdbObject2Bean(DBObjectdbObject,Tbean)throwsIllegalAccessException,
InvocationTargetException,NoSuchMethodException{
if(bean==null){
returnnull;
}
Field[]fields=bean.getClass().getDeclaredFields();
for(Fieldfield:fields){
StringvarName=field.getName();
Objectobject=dbObject.get(varName);
if(object!=null){
BeanUtils.setProperty(bean,varName,object);
}
}
returnbean;
}
}
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