实体类转换-映射EntityConverter

package com.landz.system.common.util;import java.lang.annotation.Annotation;import java.lang.reflect.Field;import java.lang.reflect.Modifier;import java.util.ArrayList;import java.util.List;import org.springframework.data.mongodb.core.query.Update;public class EntityConverter {/** * 实体类转换 (若covertEntity是一个已被赋值的实体转换时会替换相同属性名)  *  * 根据实体内属性名进行映射 *  * 属性名相同 默认属性名相同 则认为属性类型也相同 且不为空  则映射 *  *  *  * @param entity   被转换实体 * @param covertEntity  转换后的实体 * @return * @throws IllegalArgumentException * @throws IllegalAccessException */public <S extends T, T> S converEntity(S entity,S covertEntity) throws IllegalArgumentException, IllegalAccessException{Field[] entityfields = entity.getClass().getDeclaredFields();Field[] covertfields = covertEntity.getClass().getDeclaredFields();boolean breakFlag=false;for(Field covertfield : covertfields){covertfield.setAccessible(true);for(Field entityfield : entityfields){entityfield.setAccessible(true);if(entityfield.getName().equals(covertfield.getName())){//属性名相同if(entityfield.get(entity)!=null){//如果不为空 则放入covertfield.set(covertEntity, entityfield.get(entity));breakFlag=true;}}if(breakFlag){breakFlag=false;break;}}}return covertEntity;}/** * 实体类转换  *  * 根据实体内属性名进行映射 *  * 属性名相同 默认属性名相同 则认为属性类型也相同 且不为空  则映射 * @param <T> * @param <S> *  *  *  * @param entity   被转换实体 * @param covertEntity  转换后的实体类型 * @return * @throws IllegalArgumentException * @throws IllegalAccessException * @throws InstantiationException  */public  <T, S> T entityConver(S entity,Class<T> covertEntityClass) throws IllegalArgumentException, IllegalAccessException, InstantiationException{T covertEntity=covertEntityClass.newInstance();Field[] entityfields = entity.getClass().getDeclaredFields();Field[] covertfields = covertEntityClass.getDeclaredFields();boolean breakFlag=false;for(Field covertfield : covertfields){covertfield.setAccessible(true);for(Field entityfield : entityfields){entityfield.setAccessible(true);if(entityfield.getName().equals(covertfield.getName())){//属性名相同if(entityfield.get(entity)!=null){//如果不为空 则放入if((entityfield.getModifiers()&Modifier.FINAL)==Modifier.FINAL){//如果属性是final类型，不赋值break;}covertfield.set(covertEntity, entityfield.get(entity));breakFlag=true;}}if(breakFlag){breakFlag=false;break;}}}return covertEntity;}/** * 转换list * @param entities   要转换的list * @param covertEntityClass  需要转换的 class * @return * @throws IllegalArgumentException * @throws IllegalAccessException * @throws InstantiationException  */public  <T, S> List<T>  listConver( List<S> entities, Class<T> covertEntityClass) throws IllegalArgumentException, IllegalAccessException, InstantiationException{List<T>  covertEntitys=new ArrayList<T>();for (S entity : entities) {covertEntitys.add(entityConver(entity,covertEntityClass));}return covertEntitys;}/** * @MethodName : getUpdate * @Description : 获取类中所有属性及属性值 获取update 对象 * @param entity *            操作对象 * @param entityClass *            操作类，用于获取类中的方法 * @return * @throws IllegalAccessException  * @throws IllegalArgumentException  */public  Update getUpdate(Object entity, Class<?> entityClass) throws IllegalArgumentException, IllegalAccessException {Update update = new Update();// 获取类中的所有定义字段Field[] fields = entityClass.getDeclaredFields();// 循环遍历字段，获取字段对应的属性值for (Field field : fields) {// 如果不为空，设置可见性，然后返回field.setAccessible(true);if(!"serialVersionUID".equals(field.getName())){if (field.get(entity) != null) {if (isNeedPass(field)) {// 无带有Transient标示或者主键update.set(field.getName(), field.get(entity));}}}}return update;}/** * 判断是否有 类似 Transient 这种需要跳过的注解 * @param field * @return */private  Boolean isNeedPass(Field field){Boolean flag=true;Annotation[] annotations= field.getAnnotations();if(annotations.length>0){for(Annotation annotation:annotations){if("interface org.springframework.data.annotation.Transient".equals(annotation.getClass())){flag=false;break;}}}return flag;}}