此類使用感覺比較繁瑣, 每個字段加注解才可以使用, 不如mongoTemplate使用方便, 但如果使用mongo客戶端的話, 還是比手動拼接快一點, 所以貼在這兒

package com.iwhere.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; /*** DBObject 和 javaBean之間轉換* @author 231*/ public class ConvertDBObject {/*** 把實體bean對象轉換成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();// 獲取對象對應類中的所有屬性域Field[] fields = bean.getClass().getDeclaredFields();// 獲取所有注解for (Field field : fields) {org.springframework.data.mongodb.core.mapping.Field anno = field.getAnnotation(org.springframework.data.mongodb.core.mapping.Field.class);// 獲取屬性名String varName = field.getName();if ("serialVersionUID".equals(varName) || "_id".equals(varName)) {continue;}// 獲取注解的值varName = anno.value();// 修改訪問控制權限boolean accessFlag = field.isAccessible();if (!accessFlag) {field.setAccessible(true);}Object param = field.get(bean);if (param == null) {continue;} else if (param instanceof Integer) {// 判斷變量的類型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);}// 恢復訪問控制權限 field.setAccessible(accessFlag);}return dbObject;}/*** 把DBObject轉換成bean對象* * @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();org.springframework.data.mongodb.core.mapping.Field anno = field.getAnnotation(org.springframework.data.mongodb.core.mapping.Field.class);if ("serialVersionUID".equals(varName) || "_id".equals(varName)) {continue;}String fieldName = anno.value();Object object = dbObject.get(fieldName);if (object != null) {BeanUtils.setProperty(bean, varName, object);}}return bean;} }

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轉載于:https://www.cnblogs.com/wenbronk/p/6482720.html

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