1. 简介
dozer是一种JavaBean的映射工具,类似于apache的BeanUtils。但是dozer更强大,它可以灵活的处理复杂类型之间的映射。不但可以进行简单的属性映射、复杂的类型映射、双向映射、递归映射等,并且可以通过XML配置文件进行灵活的配置。
2. 准备
现在开始就小试一下。首先,需要下载jar包,
dozer.jar
还需要slf4j.jar,commons-lang.jar,commons-beanutil.jar, commons-loggin.jar
3. code
3.1 创建两个实体bean
//源实体类
public class Book {
private String name;
private String author;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public Book() {
}
}
//目标实体类
public class BookVo {
private String namevo;
private String authorvo;
public String getNamevo() {
return namevo;
}
public void setNamevo(String namevo) {
this.namevo = namevo;
}
public String getAuthorvo() {
return authorvo;
}
public void setAuthorvo(String authorvo) {
this.authorvo = authorvo;
}
public BookVo() {
}
}
3.2 配置 bookMapper.xml
该文件用来对DozerBeanMapper进行设置。
<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns="http://dozer.sourceforge.net"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://dozer.sourceforge.net
http://dozer.sourceforge.net/schema/beanmapping.xsd">
<mapping>
<class-a>test.Book</class-a>
<class-b>test.BookVo</class-b>
<field>
<a>name</a>
<b>namevo</b>
</field>
<field>
<a>author</a>
<b>authorvo</b>
</field>
</mapping>
</mappings>
3.2 验证
package test;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dozer.DozerBeanMapper;
/**
* 说明:
*
* @author fredia
* @version Aug 17, 2017
*/
public class DozerTest {
/**
* @param args
*/
public static void main(String[] args) {
testByXml();
}
public static void testByXml() {
Book book = new Book();
book.setAuthor("lsr");
book.setName("dozer demo");
DozerBeanMapper mapper = new DozerBeanMapper();
List<String> mappers = new ArrayList<String>();
mappers.add("bookMapper.xml");
mapper.setMappingFiles(mappers);
BookVo vo = new BookVo();
mapper.map(book, vo);
System.out.println("book's name:" + book.getName());
System.out.println("bookVo's name:" + vo.getNamevo());
}
}
4. 总结
工具的使用都是基于对重复工作的消灭,所以对于实体类之间属性的复制,采用这样的方式是会方便很多,避免大量的get与set重复工作。
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