java操作mongodb时,对象bean和DBObject相互转换的方法(推荐)

如下所示：

package com.iqbon.spider.util; 
 
import java.lang.reflect.field; 
import java.lang.reflect.invocationtargetexception; 
import java.util.date; 
 
import org.apache.commons.beanutils.beanutils; 
 
import com.mongodb.basicdbobject; 
import com.mongodb.dbobject; 
 
public class beanutil { 
 
 /** 
  * 把实体bean对象转换成dbobject 
  * @param bean 
  * @return 
  * @throws illegalargumentexception 
  * @throws illegalaccessexception 
  */ 
 public static <t> dbobject bean2dbobject(t bean) throws illegalargumentexception, 
   illegalaccessexception { 
  if (bean == null) { 
   return null; 
  } 
  dbobject dbobject = new basicdbobject(); 
  // 获取对象对应类中的所有属性域 
  field[] fields = bean.getclass().getdeclaredfields(); 
  for (field field : fields) { 
   // 获取属性名 
   string varname = field.getname(); 
   // 修改访问控制权限 
   boolean accessflag = field.isaccessible(); 
   if (!accessflag) { 
    field.setaccessible(true); 
   } 
   object param = field.get(bean); 
   if (param == null) { 
    continue; 
   } else if (param instanceof integer) {//判断变量的类型 
    int value = ((integer) param).intvalue(); 
    dbobject.put(varname, value); 
   } else if (param instanceof string) { 
    string value = (string) param; 
    dbobject.put(varname, value); 
   } else if (param instanceof double) { 
    double value = ((double) param).doublevalue(); 
    dbobject.put(varname, value); 
   } else if (param instanceof float) { 
    float value = ((float) param).floatvalue(); 
    dbobject.put(varname, value); 
   } else if (param instanceof long) { 
    long value = ((long) param).longvalue(); 
    dbobject.put(varname, value); 
   } else if (param instanceof boolean) { 
    boolean value = ((boolean) param).booleanvalue(); 
    dbobject.put(varname, value); 
   } else if (param instanceof date) { 
    date value = (date) param; 
    dbobject.put(varname, value); 
   } 
   // 恢复访问控制权限 
   field.setaccessible(accessflag); 
  } 
  return dbobject; 
 } 
 
 /** 
  * 把dbobject转换成bean对象 
  * @param dbobject 
  * @param bean 
  * @return 
  * @throws illegalaccessexception 
  * @throws invocationtargetexception 
  * @throws nosuchmethodexception 
  */ 
 public static <t> t dbobject2bean(dbobject dbobject, t bean) throws illegalaccessexception, 
   invocationtargetexception, nosuchmethodexception { 
  if (bean == null) { 
   return null; 
  } 
  field[] fields = bean.getclass().getdeclaredfields(); 
  for (field field : fields) { 
   string varname = field.getname(); 
   object object = dbobject.get(varname); 
   if (object != null) { 
    beanutils.setproperty(bean, varname, object); 
   } 
  } 
  return bean; 
 } 
}

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