基于原型模式和享元模式的数据拷贝

基于原型模式完成分层pojo之间拷贝。

Apache的BeanUtils，反射、

Apache的PropertyUtils，反射，

Spring的BeanUtils，反射

cglib的BeanCopier，动态代理性能好

public class BeanCopierUtils{
public static HashMap<String,BeanCopier> cacheMap=new HashMap<String,BeanCopier>();

public void copyproperties(Object source,Object target){
String cache= source.getclass().tostring()+target.getClass().tostring();
if(!cacheMap.contentKey(cache)){
synchronized(BeancopierUtils.class){
if(!cacheMap.containskey(cache)){
beancopier= Beancopier.create(source.getclass,target.getclass,false);
cacheMap.put(cache,beancopier);
}else{
beanCopier= cahceMap.get(cache);
}
}

}else{
beanCopier=cacheMap.get(cache);
}

beancopier.copy(source,target,null);
}
}

　　

public class StudentVo {
        private String id;
        private String name;
public <T> T clone(Class<T> tClass){
    T target= null;
    try {
        target = tClass.newInstance();
        BeanCopierUtils.copyproperties(this,target);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return  target;
}
    }

        <!-- cglib的BeanCopier需要的依赖 -->
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm-commons</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm-util</artifactId>
            <version>3.3.1</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>2.2.2</version>
        </dependency>