JavaBean对象转DBOBject对象

最新推荐文章于 2021-02-16 09:37:39 发布

littie1987

最新推荐文章于 2021-02-16 09:37:39 发布

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分类专栏：数据库文章标签： java 数据库

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本文介绍了一个简单的工具类，用于将JavaBean对象转换为适合MongoDB存储的DBObject对象，特别适用于不包含子对象和集合对象的情况。

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package com.paile.utils.beans;

import java.beans.PropertyDescriptor;
import java.sql.Timestamp;
import java.util.List;
import java.util.Set;

import org.apache.commons.beanutils.PropertyUtilsBean;

import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;

/***
 * 由JavaBean 到mongoDB的DBObject对象的转换(不包含子对象和集合对象)
 * @author libo
 */
public class SimpleJavaBean2DBObject {

	/***
	 * 将普通Java对象属性复制到DBObject里面(不包含子对象和集合对象)
	 * @param ogi  普通Java对象
	 *@return 返回DBObject对象
	 */
	public static DBObject copyProperties(Object orig,DBObject dbObj)throws Exception{
		if(orig==null){
			throw new IllegalArgumentException("No object bean specified,or is null");
		}
		PropertyUtilsBean pro = new PropertyUtilsBean();
		PropertyDescriptor[] origDescriptors = pro.getPropertyDescriptors(orig.getClass());
		  for (int i = 0; i < origDescriptors.length; i++) {
			  PropertyDescriptor pdesc =  origDescriptors[i];
              String name = pdesc.getName();
              if ("class".equals(name)) {
                  continue; // No point in trying to set an object's class
              };
              if (pro.isReadable(orig, name)){
                 Class<?> t = pdesc.getPropertyType();
                 boolean isPrimitive = MyBeanUtils.isPrimitiveType(t);
                 if(isPrimitive){
                	 //基础类型(8大类型+String)
                	 Object value = pro.getSimpleProperty(orig, name);
                	 dbObj.put(name, value);
                 }else if(t == Timestamp.class){
                	 Object value = pro.getSimpleProperty(orig, name);
                	 dbObj.put(name, value);
                 }else{
                	 Object value = pro.getSimpleProperty(orig, name);
                	 if(t.isAssignableFrom(List.class)
                			 ||t.isAssignableFrom(Set.class)){
                		 if(value!=null){
                			 List list = (List)value;
                			 if(list.isEmpty())
                				 continue;
                			BasicDBList dbList = new BasicDBList();
                			 for(int j = 0;j<list.size();j++){
                				 Object object = list.get(j);
                				 DBObject db = new BasicDBObject();
                				 if(object!=null)
                					 copyProperties(object, db);
                				 dbList.add(db);
                			 }
                			 dbObj.put(name, dbList);
                		 }
                	 }else{
                		 DBObject db = new BasicDBObject();
                		 if(value!=null)
                			 copyProperties(value, db );
                    	 dbObj.put(name, db);
                	 }
                 }
              }
		  }
		  return null;
	}
}