Java Bean 映射工具 Dozer (转)
分析多层架构的JEE系统，经常存在JavaBean直接的拷贝。比如在DAO层，我们通过POJO取得业务层需要的数据，将这些数据传递给Service层的VO。POJO与VO就存在典型的值拷贝。还有就是Webservice，客户端调用Webservice，也存在将大量返回值映射到相应的JavaBean里。呵呵 我们项目就是这个需求。
典型的解决方案就是手动拷贝，弊端很明显，代码中充斥大量Set Get方法，真正的业务没埋藏与值的拷贝之中。另一种方案就是使用BeanUtil，但BeanUtil不够很好的灵活性，又时候还不得不手动拷贝。
对于这种重复没有实际意义的拷贝难道没有终结解决方案吗？！ Dozer 一把JavaBean利器。（http://dozer.sourceforge.net/）
什么是Dozer？
看看官方的定义：
Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to
another. Typically, these Java Beans will be of different complex types.
Dozer supports simple property mapping, complextype mapping, bi - directional mapping, implicit explicit mapping, as well as recursive
mapping.This includes mapping collection attributes that also need mapping at the element level.
another. Typically, these Java Beans will be of different complex types.
Dozer supports simple property mapping, complextype mapping, bi - directional mapping, implicit explicit mapping, as well as recursive
mapping.This includes mapping collection attributes that also need mapping at the element level.
注意：Dozer支持简单类型 复杂类型的双向递归映射。
如何使用呢？ 类似BeanUtil 很简单，如果两个javaBean之间，属性名相同，类型为基本类型，那么下面代码就OK了，基本没有学习曲线。
Mapper mapper
=
new
DozerBeanMapper();
DestinationObject destObject = mapper.map(sourceObject, DestinationObject. class );
or
DestinationObject destObject = new DestinationObject();
mapper.map(sourceObject, destObject);
DestinationObject destObject = mapper.map(sourceObject, DestinationObject. class );
or
DestinationObject destObject = new DestinationObject();
mapper.map(sourceObject, destObject);
在后续的的内容中，我会介绍如何配置复杂的Map，如何自定义Map，如何获得Map的统计数据等。JavaBean之间拷贝利器-Dozer(2) 映射数据类型不一致，级联映射与自定义映射