Dozer 是一个对象转换工具。
Dozer可以在JavaBean到JavaBean之间进行递归数据复制,并且这些JavaBean可以是不同的复杂的类型,
所有的mapping,Dozer将会很直接的将名称相同的fields进行复制,如果field名不同,或者有特别的对应要求,则可以在xml中进行定义
dozer是深层复制的,即使原实体中有其他对象的引用,只要目标数据中有对应的引用对象或者配置文件中指定了对应的mapper,目标数据也会获取这个引用对象
java工具类是:
public class DozerBeanCopy {
private static DozerBeanMapper dozer = new DozerBeanMapper();
public static void copy(Object source, Object destinationObject) {
dozer.map(source, destinationObject);
}
public static void main(String[] args) {
//map ->实体 对于map中和实体中属性名一样的字段会自动进行转化,不一样的字段转换不成功
Student student=new Student();
HashMap<Object, Object> map=new HashMap<Object,Object>();
map.put("id", "id");
map.put("name", "name");
map.put("age1", 11);
copy(map, student);
System.out.println(student.getName());
System.out.println(student.getAge());
//实体->dto dto->实体的相互转化,其中目标数据不一样的字段不会自动转化
Student student2=new Student("id", "name", 11);
StudentDTO sDto=new StudentDTO();
copy(student2, sDto);
System.out.println(sDto.getName());
//方式二:该方式用于数据类型不一致,或者名称不相同或者有级联关系等情况下的映射,该方式可以添加多个配置文件
Student student3=new Student("id", "name", 11);
StudentVO svo=new StudentVO();
List myMappingFiles = new ArrayList();
myMappingFiles.add("dozerBeanMapping.xml");
DozerBeanMapper mapper = new DozerBeanMapper();
mapper.setMappingFiles(myMappingFiles);
mapper.map(student3, svo);
System.out.println(svo.getNameVo());
}
}
配置文件如下:
<?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 date-format="yyyy-MM-dd">
<class-a>com.test.DozerBeanCopy.Student</class-a>
<class-b>com.test.DozerBeanCopy.StudentVO</class-b>
<field>
<a>name</a>
<b>nameVo</b>
</field>
<field>
<a>age</a>
<b>ageVo</b>
</field>
</mapping>
</mappings>
web:
1.在spring整合dozer的时候可以在spring的配置文件中加入以下代码:<bean id="mapper" class="org.dozer.spring.DozerBeanMapperFactoryBean">
<property name="mappingFiles">
<list> <value>classpath*:dozer-config/dozerBeanMapping.xml</value>
</list>
</property>
</bean>
2.在basecontroller或者baseService下面注入这个bean
private Mappermapper ;
public Mapper getMapper(){
return mapper;
}
public void setMapper(Mapper mapper){
this.mapper = mapper;
}
3.我们把dozker交给spring去管理后就可以使用以下方式直接复制对象
getMapper().map(sourceObject,DestinationObject.class)
使用过程中的错误:
1.xml解析错误---好吧,我新建的文件,第一行写成这样了
<?xmlversion="1.0"encoding="UTF-8"?>
so,你看出来了没?应该这样
<?xmlversion="1.0" encoding="UTF-8"?>
Caused by: org.xml.sax.SAXException: Parsing Fatal Error
Line: 1
URI: null
Message: White space is required before the encoding pseudo attribute in the XML declaration.
at org.dozer.loader.xml.XMLParserFactory$DozerDefaultHandler.fatalError(XMLParserFactory.java:113)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
3.缺少commons-lang3.jar依赖
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils
at org.dozer.util.ResourceLoader.getResource(ResourceLoader.java:59)
at org.dozer.util.DefaultClassLoader.loadResource(DefaultClassLoader.java:49)
at org.dozer.config.GlobalSettings.loadGlobalSettings(GlobalSettings.java:116)
4.缺少 commons-beans.jar
Caused by: java.lang.ClassNotFoundException: org.apache.commons.beanutils.ConversionException
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
总之,需要引入的jar包有: