MongoDB:實體物件(javabean)轉DBObject

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代碼僅供練習(反射,泛型):

package utils;import java.lang.reflect.Field;import com.mongodb.BasicDBObject;import com.mongodb.DBObject;import pojo.User;public class BeanFromDBObject {    /**     * @Description:bean-->DBObject     * @param  bean     * @return DBObject 傳回型別     */    public static <T> DBObject getDBObject(T bean) {        if (bean == null) {            return null;        }        DBObject obj = new BasicDBObject();        Field[] field = bean.getClass().getDeclaredFields();        for (Field f : field) {            String name = f.getName();            if (!f.isAccessible()) {                f.setAccessible(true);            }            try {                Object oj = f.get(bean);                if (oj == null) {                    obj.put(name, "");                } else if (oj instanceof Integer) {                    int value = ((Integer) oj).intValue();                    obj.put(name, value);                } else if (oj instanceof Double) {                    Double value = ((Double) oj).doubleValue();                    obj.put(name, value);                } else if (oj instanceof Float) {                    Float value = ((Float) oj).floatValue();                    obj.put(name, value);                } else if (oj instanceof Boolean) {                    Boolean value = ((Boolean) oj).booleanValue();                    obj.put(name, value);                } else if (oj instanceof Long) {                    Long value = ((Long) oj).longValue();                    obj.put(name, value);                } else {                    obj.put(name, oj);                }            } catch (Exception e) {                e.printStackTrace();            }        }        return obj;    }}

 

MongoDB:實體物件(javabean)轉DBObject