技术标签: spring java 属性映射框架 深度剖析java 技术 dozer intellij-idea
项目开发过程中,经常需要编写model之间的转换,最常见的有:
等操作,故为了简化代码的开发工作,需要简化对象属性之间复制的步骤,目前有两种解决方案,一种是定义converter 使用手写或插件生成,对各个属性进行set方法的设置。
IDEA提供GenerateAllSetter插件,可帮助我们快速生成上述代码。
另一中方案是使用自动映射框架进行属性的自动设置,基本有两种方向,一种是基于反射进行的,另一中是进行预编译生成相关代码,当然了 后一种在项目运行中效率是最高的。但是我们下面讲解的具体落地 使用的是基于反射实现的框架 dozer。
<dependency>
<groupId>net.sf.dozer</groupId>
<artifactId>dozer</artifactId>
<version>5.5.1</version>
</dependency>
定义接口
public interface SmartMapper {
/**
* 创建指定类型的对象
*
* @param source
* @param destinationClass
* @param <T>
* @return
* @throws SmartMapperException
*/
<T> T map(Object source, Class<T> destinationClass) throws SmartMapperException;
/**
* 进行属性的赋值
*
* @param source object to convert from
* @param destination object to convert to
* @throws SmartMapperException mapping failure
*/
void map(Object source, Object destination) throws SmartMapperException;
/**
* 映射集合
* @param source
* @param destinationClass
* @param <T>
* @return
* @throws SmartMapperException
*/
<T> List<T> mapList(List<Object> source,Class<T> destinationClass) throws SmartMapperException;
/**
* 映射集合
* @param source
* @param destination
* @throws SmartMapperException
*/
void map(List<Object> source, List<Object> destination) throws SmartMapperException;
}
public class SmartDozerMapper implements SmartMapper {
private DozerBeanMapper dozerBeanMapper = new DozerBeanMapper();
private DozerBuilder.ConfigurationBuilder config;
/*自定义属性 映射配置 和自定义类型转化器*/
public void addBeanMapping(SmartBeanMapping beanMapping) {
try {
dozerBeanMapper.addMapping(new SmartBeanMappingBuilder() {
@Override
protected void configure() {
TypeMappingBuilder typeMappingBuilder = mapping(beanMapping.getSrcType(), beanMapping.getDestType());
List<SmartFieldMapping> fieldMappingList = beanMapping.getFieldMappings();
for (SmartFieldMapping fieldMapping : fieldMappingList) {
if (fieldMapping.getTypeConverter() == null) {
typeMappingBuilder.fields(fieldMapping.getSrcFieldName(), fieldMapping.getDestFieldName());
} else {
SmartFieldCustomConverter.addFieldTypeConverter(beanMapping.getSrcType(), beanMapping.getDestType(), fieldMapping.getSrcFieldName(), fieldMapping.getDestFieldName(), fieldMapping.getTypeConverter());
String parameter = beanMapping.getSrcType().getName() + "," + beanMapping.getDestType().getName() + "|" + fieldMapping.getSrcFieldName() + "," + fieldMapping.getDestFieldName();
typeMappingBuilder.fields(fieldMapping.getSrcFieldName(), fieldMapping.getDestFieldName(), customConverter(SmartFieldCustomConverter.class, parameter));
}
}
}
});
} catch (Exception e) {
throw new SmartMapperException(e.getMessage(), e);
}
}
/*
全局类型转换器
*/
public void addCustomConterver(SmartTypeConverter converter) {
Pair<Class, Class> typeConverterKey = ResolveTypeUtils.resolveTypeConverterKey(converter.getClass());
SmartCustomConverter.addSmartTypeConverter(converter);
if(config == null) {
dozerBeanMapper.addMapping(new SmartBeanMappingBuilder() {
@Override
protected void configure() {
config = this.getDozerBuilder().configuration();
}
});
config.customConverter(SmartCustomConverter.class).classA(typeConverterKey.getKey()).classB(typeConverterKey.getValue());
}
}
一下功能还是交给dozerBeanMapper去提供
@Override
public <T> T map(Object source, Class<T> destinationClass) throws SmartMapperException {
try {
return dozerBeanMapper.map(source, destinationClass);
}catch (MappingException e) {
throw new SmartMapperException(e.getMessage(),e);
}
}
@Override
public void map(Object source, Object destination) throws SmartMapperException {
try {
dozerBeanMapper.map(source,destination);
}catch (MappingException e) {
throw new SmartMapperException(e.getMessage(),e);
}
}
@Override
public <T> List<T> mapList(List<Object> source, Class<T> destinationClass) throws SmartMapperException {
if(source == null) {
return null;
}
try {
List<T> ret = new ArrayList<>();
for (Object element : source) {
T des = map(element, destinationClass);
ret.add(des);
}
return ret;
}catch (MappingException e) {
throw new SmartMapperException(e.getMessage(),e);
}
}
@Override
public void map(List<Object> source, List<Object> destination) throws SmartMapperException {
if(source == null) {
return;
}
try {
for (int i = 0; i < source.size(); i++) {
map(source.get(i), destination.get(i));
}
}catch (MappingException e) {
throw new SmartMapperException(e.getMessage(),e);
}
}
}
public abstract class SmartBeanMappingBuilder extends BeanMappingBuilder {
//对外暴露config
protected DozerBuilder getDozerBuilder() throws SmartMapperException {
try {
Field dozerBuilder =
this.getClass().getSuperclass().getSuperclass().getDeclaredField("dozerBuilder");
dozerBuilder.setAccessible(true);
return (DozerBuilder) dozerBuilder.get(this);
}catch (Exception e) {
throw new SmartMapperException(e.getMessage(),e);
}
}
}
public class SmartCustomConverter implements CustomConverter{
private static Map<Pair<Class,Class>, SmartTypeConverter> smartTypeConverterHashMap = new HashMap<>();
private static Class<?>[] superClassArray = new Class<?>[]{
Enumerable.class};
@Override
public Object convert(Object existingDestinationFieldValue, Object sourceFieldValue, Class<?> destinationClass, Class<?> sourceClass) {
SmartTypeConverter smartTypeConverter = getTypeConverter(destinationClass,sourceClass);
if(smartTypeConverter != null) {
return smartTypeConverter.convert(existingDestinationFieldValue,sourceFieldValue,destinationClass,sourceClass);
}
return existingDestinationFieldValue;
}
public static void addSmartTypeConverter(SmartTypeConverter smartTypeConverter) {
//解析出smartCustom 的源类和目标类
smartTypeConverterHashMap.put(ResolveTypeUtils.resolveTypeConverterKey(smartTypeConverter.getClass()),smartTypeConverter);
}
private SmartTypeConverter getTypeConverter(Class<?> destinationClass, Class<?> sourceClass) {
// 针对Enumerable类型特殊处理下
Class<?> destClass = convertClass(destinationClass);
Class<?> srcClass = convertClass(sourceClass);
SmartTypeConverter typeConverter = smartTypeConverterHashMap.get(new Pair<>(srcClass, destClass));
return typeConverter;
}
private Class<?> convertClass(Class<?> orgiClass) {
Class<?> targetClass = orgiClass;
for (Class<?> each : superClassArray) {
if (each.isAssignableFrom(targetClass)) {
targetClass = each;
break;
}
}
return targetClass;
}
}
public class SmartFieldCustomConverter implements ConfigurableCustomConverter {
private static Map<Pair<Class, Class>, Map<Pair<String, String>, SmartTypeConverter>> fieldTypeConverterMap = new ConcurrentHashMap<>();
private Class baseSrcType;
private Class baseDestType;
private String srcFieldName;
private String destFieldName;
private SmartTypeConverter typeConverter;
public SmartFieldCustomConverter() {
}
public static void addFieldTypeConverter(Class srcType, Class destType, String srcFieldName, String destFieldName, SmartTypeConverter typeConverter) {
Pair<Class, Class> srcDestClassKey = new Pair<>(srcType, destType);
Map<Pair<String, String>, SmartTypeConverter> fieldMap = fieldTypeConverterMap.get(srcDestClassKey);
if (fieldMap == null) {
fieldMap = new ConcurrentHashMap<>();
fieldTypeConverterMap.put(srcDestClassKey, fieldMap);
}
fieldMap.put(new Pair<>(srcFieldName, destFieldName), typeConverter);
}
@Override
public Object convert(Object existingDestinationFieldValue, Object sourceFieldValue, Class<?> destinationClass, Class<?> sourceClass) {
if (typeConverter == null) {
initTypeConverter();
}
if (typeConverter != null) {
return typeConverter.convert(existingDestinationFieldValue, sourceFieldValue, destinationClass, sourceClass);
}
return existingDestinationFieldValue;
}
private void initTypeConverter() {
Map<Pair<String, String>, SmartTypeConverter> fieldMap = fieldTypeConverterMap.get(new Pair<>(baseSrcType, baseDestType));
if (fieldMap != null) {
typeConverter = fieldMap.get(new Pair<>(srcFieldName, destFieldName));
}
}
@Override
public void setParameter(String parameter) {
// srcClassName,destClassName|srcFieldName,destFieldName
try {
String[] classFieldArray = parameter.split("\\|");
String[] classArray = classFieldArray[0].split(",");
String[] fieldArray = classFieldArray[1].split(",");
baseSrcType = Class.forName(classArray[0]);
baseDestType = Class.forName(classArray[1]);
srcFieldName = fieldArray[0];
destFieldName = fieldArray[1];
initTypeConverter();
} catch (Exception e) {
throw new SmartMapperException(e.getMessage(), e);
}
}
}
public interface SmartTypeConverter<S, D> {
/**
* 转换源对象为目标对象
*
* @param existingDest 目标对象所属类中已经存在的值
* @param src 源对象
* @param destClass 目标类
* @param srcClass 源类
* @return 目标对象
*/
D convert(D existingDest, S src, Class<D> destClass, Class<S> srcClass);
}
public class SmartBeanMapping<S, D> {
private Class<S> srcType;
private Class<D> destType;
private List<SmartFieldMapping> fieldMappingList = new ArrayList<>();
private SmartBeanMapping(Class<S> srcType, Class<D> destType) {
this.srcType = srcType;
this.destType = destType;
}
public static <S, D> SmartBeanMapping<S, D> create(Class<S> srcType, Class<D> destType) {
return new SmartBeanMapping(srcType, destType);
}
public SmartBeanMapping fields(String srcFieldName, String destFieldName) {
fields(srcFieldName, destFieldName, null);
return this;
}
public SmartBeanMapping fields(String srcFieldName, SmartTypeConverter typeConverter) {
fields(srcFieldName, null, typeConverter);
return this;
}
public SmartBeanMapping fields(String srcFieldName, String destFieldName, SmartTypeConverter typeConverter) {
SmartFieldMapping fieldMapping = SmartFieldMapping.create(srcFieldName, destFieldName, typeConverter);
fieldMappingList.add(fieldMapping);
return this;
}
public List<SmartFieldMapping> getFieldMappings() {
return fieldMappingList;
}
public List<SmartFieldMapping> getFieldMappings(String srcFieldName) {
List<SmartFieldMapping> srcFieldMappingList = new ArrayList<>();
for (SmartFieldMapping each : fieldMappingList) {
if (each.getSrcFieldName().equals(srcFieldName)) {
srcFieldMappingList.add(each);
}
}
return srcFieldMappingList;
}
public SmartFieldMapping getFieldMapping(String srcFieldName) {
List<SmartFieldMapping> fieldMappingList = getFieldMappings(srcFieldName);
if (fieldMappingList != null && fieldMappingList.size() > 0) {
return fieldMappingList.get(0);
}
return null;
}
public Class<S> getSrcType() {
return srcType;
}
public Class<D> getDestType() {
return destType;
}
}
public class SmartFieldMapping {
private String srcFieldName;
private String destFieldName;
private Class srcFieldType;
private Class destFieldType;
private SmartTypeConverter typeConverter;
private SmartFieldMapping(String srcFieldName, String destFieldName) {
this(srcFieldName, destFieldName, null);
}
private SmartFieldMapping(String srcFieldName, SmartTypeConverter typeConverter) {
this(srcFieldName, null, typeConverter);
}
private SmartFieldMapping(String srcFieldName, String destFieldName, SmartTypeConverter typeConverter) {
this.srcFieldName = srcFieldName;
if (destFieldName == null) {
this.destFieldName = srcFieldName;
} else {
this.destFieldName = destFieldName;
}
if (typeConverter != null) {
this.typeConverter = typeConverter;
Pair<Class, Class> srcDestKey = ResolveTypeUtils.resolveTypeConverterKey(typeConverter.getClass());
this.srcFieldType = srcDestKey.getKey();
this.destFieldType = srcDestKey.getValue();
}
}
public static SmartFieldMapping create(String srcFieldName, String destFieldName) {
return new SmartFieldMapping(srcFieldName, destFieldName);
}
public static SmartFieldMapping create(String srcFieldName, SmartTypeConverter typeConverter) {
return new SmartFieldMapping(srcFieldName, typeConverter);
}
public static SmartFieldMapping create(String srcFieldName, String destFieldName, SmartTypeConverter typeConverter) {
return new SmartFieldMapping(srcFieldName, destFieldName, typeConverter);
}
public String getSrcFieldName() {
return srcFieldName;
}
public String getDestFieldName() {
return destFieldName;
}
public Class getSrcFieldType() {
return srcFieldType;
}
public Class getDestFieldType() {
return destFieldType;
}
public SmartTypeConverter getTypeConverter() {
return typeConverter;
}
}
#### 工具类
public class ResolveTypeUtils {
public static Pair<Class, Class> resolveTypeConverterKey(Class<?> typeConvereterType) {
try {
Type typeConverterInterface = getInterface(typeConvereterType);
Type[] srcDestTypeArray = ((ParameterizedType) typeConverterInterface).getActualTypeArguments();
return new Pair<>(getClass(srcDestTypeArray[0]), getClass(srcDestTypeArray[1]));
} catch (Exception e) {
throw new IllegalStateException("typeConvereterType is invalid:" + e.getMessage(), e);
}
}
private static Class getClass(Type type) {
if (type instanceof Class) {
return (Class) type;
}
return (Class) ((ParameterizedType) type).getRawType();
}
private static Type getInterface(Class<?> typeConvereterType) {
if (typeConvereterType == null || Object.class.equals(typeConvereterType)) {
// 到头了
return null;
}
Type typeConverterInterface = getTypeConverterInterface(typeConvereterType);
if (typeConverterInterface == null) {
return getInterface(typeConvereterType.getSuperclass());
}
return typeConverterInterface;
}
private static Type getTypeConverterInterface(Class<?> typeConvereterType) {
Type[] interfaces = typeConvereterType.getGenericInterfaces();
if (interfaces == null) {
return null;
}
for (Type each : interfaces) {
if (each != null && each instanceof ParameterizedType && SmartTypeConverter.class.equals(((ParameterizedType) each).getRawType())) {
return each;
}
}
return null;
}
}
public class EnumTDConverter implements SmartTypeConverter<Enumerable, DictionaryItemDto> {
@Override
public DictionaryItemDto convert(DictionaryItemDto existingDest, Enumerable src, Class<DictionaryItemDto> destClass, Class<Enumerable> srcClass) {
if(src != null) {
DictionaryItemDto dto = new DictionaryItemDto();
dto.setCode(src.getCode());
dto.setCodeString(src.getCodeString());
return dto;
}
return null;
}
}
@Configuration
public class SmartMapperConfig {
@Bean
public SmartMapper createSmartMapper() {
SmartDozerMapper smartDozerMapper = new SmartDozerMapper();
//全局类型转化器
smartDozerMapper.addCustomConterver(new EnumTDConverter());
//自定义类型添加属性字段映射
smartDozerMapper.addBeanMapping(create());
return smartDozerMapper;
}
private SmartBeanMapping create() {
return SmartBeanMapping.create(User.class, UserResponse.class).fields("userType","dictionaryItemDto");
}
}
@SpringBootTest(classes = MybatislearnApplication.class)
@RunWith(SpringRunner.class)
@Slf4j
public class MybatislearnApplicationTests {
@Autowired
private SmartMapper smartMapper;
@Test
public void test() {
User user = new User();
user.setUserType(UserType.NORMAL_USER);
UserResponse map = smartMapper.map(user, UserResponse.class);
System.out.println(map);
}
}
文章浏览阅读3.2k次。本文研究全球与中国市场分布式光纤传感器的发展现状及未来发展趋势,分别从生产和消费的角度分析分布式光纤传感器的主要生产地区、主要消费地区以及主要的生产商。重点分析全球与中国市场的主要厂商产品特点、产品规格、不同规格产品的价格、产量、产值及全球和中国市场主要生产商的市场份额。主要生产商包括:FISO TechnologiesBrugg KabelSensor HighwayOmnisensAFL GlobalQinetiQ GroupLockheed MartinOSENSA Innovati_预计2026年中国分布式传感器市场规模有多大
文章浏览阅读1.1k次,点赞2次,收藏12次。常用组合逻辑电路结构——为IC设计的延时估计铺垫学习目的:估计模块间的delay,确保写的代码的timing 综合能给到多少HZ,以满足需求!_基4布斯算法代码
文章浏览阅读3.3k次,点赞3次,收藏5次。OpenAI Manager助手(基于SpringBoot和Vue)_chatgpt网页版
文章浏览阅读2.2k次。USACO自1992年举办,到目前为止已经举办了27届,目的是为了帮助美国信息学国家队选拔IOI的队员,目前逐渐发展为全球热门的线上赛事,成为美国大学申请条件下,含金量相当高的官方竞赛。USACO的比赛成绩可以助力计算机专业留学,越来越多的学生进入了康奈尔,麻省理工,普林斯顿,哈佛和耶鲁等大学,这些同学的共同点是他们都参加了美国计算机科学竞赛(USACO),并且取得过非常好的成绩。适合参赛人群USACO适合国内在读学生有意向申请美国大学的或者想锻炼自己编程能力的同学,高三学生也可以参加12月的第_usaco可以多次提交吗
文章浏览阅读394次。1.1 存储程序1.2 创建存储过程1.3 创建自定义函数1.3.1 示例1.4 自定义函数和存储过程的区别1.5 变量的使用1.6 定义条件和处理程序1.6.1 定义条件1.6.1.1 示例1.6.2 定义处理程序1.6.2.1 示例1.7 光标的使用1.7.1 声明光标1.7.2 打开光标1.7.3 使用光标1.7.4 关闭光标1.8 流程控制的使用1.8.1 IF语句1.8.2 CASE语句1.8.3 LOOP语句1.8.4 LEAVE语句1.8.5 ITERATE语句1.8.6 REPEAT语句。_mysql自定义函数和存储过程
文章浏览阅读188次。半导体二极管——集成电路最小组成单元。_本征半导体电流为0
文章浏览阅读2.8k次,点赞3次,收藏18次。游戏水面特效实现方式太多。咱们这边介绍的是一最简单的UV动画(无顶点位移),整个mesh由4个顶点构成。实现了水面效果(左图),不动代码稍微修改下参数和贴图可以实现岩浆效果(右图)。有要思路是1,uv按时间去做正弦波移动2,在1的基础上加个凹凸图混合uv3,在1、2的基础上加个水流方向4,加上对雾效的支持,如没必要请自行删除雾效代码(把包含fog的几行代码删除)S..._unity 岩浆shader
文章浏览阅读5k次。广义线性模型是线性模型的扩展,它通过连接函数建立响应变量的数学期望值与线性组合的预测变量之间的关系。广义线性模型拟合的形式为:其中g(μY)是条件均值的函数(称为连接函数)。另外,你可放松Y为正态分布的假设,改为Y 服从指数分布族中的一种分布即可。设定好连接函数和概率分布后,便可以通过最大似然估计的多次迭代推导出各参数值。在大部分情况下,线性模型就可以通过一系列连续型或类别型预测变量来预测正态分布的响应变量的工作。但是,有时候我们要进行非正态因变量的分析,例如:(1)类别型.._广义线性回归模型
文章浏览阅读69次。环境保护、 保护地球、 校园环保、垃圾分类、绿色家园、等网站的设计与制作。 总结了一些学生网页制作的经验:一般的网页需要融入以下知识点:div+css布局、浮动、定位、高级css、表格、表单及验证、js轮播图、音频 视频 Flash的应用、ul li、下拉导航栏、鼠标划过效果等知识点,网页的风格主题也很全面:如爱好、风景、校园、美食、动漫、游戏、咖啡、音乐、家乡、电影、名人、商城以及个人主页等主题,学生、新手可参考下方页面的布局和设计和HTML源码(有用点赞△) 一套A+的网_垃圾分类网页设计目标怎么写
文章浏览阅读614次,点赞7次,收藏11次。之前找到一个修改 exe 中 DLL地址 的方法, 不太好使,虽然能正确启动, 但无法改变 exe 的工作目录,这就影响了.Net 中很多获取 exe 执行目录来拼接的地址 ( 相对路径 ),比如 wwwroot 和 代码中相对目录还有一些复制到目录的普通文件 等等,它们的地址都会指向原来 exe 的目录, 而不是自定义的 “lib” 目录,根本原因就是没有修改 exe 的工作目录这次来搞一个启动程序,把 .net 的所有东西都放在一个文件夹,在文件夹同级的目录制作一个 exe._.net dll 全局目录
文章浏览阅读1.5k次。本文为转载,原博客地址:http://blog.csdn.net/hujingshuang/article/details/46910259简介 BRIEF是2010年的一篇名为《BRIEF:Binary Robust Independent Elementary Features》的文章中提出,BRIEF是对已检测到的特征点进行描述,它是一种二进制编码的描述子,摈弃了利用区域灰度..._breif description calculation 特征点
文章浏览阅读4.1k次,点赞21次,收藏79次。本文是《基于SpringBoot的房屋租赁管理系统》的配套原创说明文档,可以给应届毕业生提供格式撰写参考,也可以给开发类似系统的朋友们提供功能业务设计思路。_基于spring boot的房屋租赁系统论文