day27(反射之内省机制实现BeanUtils)

Posted 2020-10-11 fjk

 

　　　　使用内省方式来实现beanUtils往对象里面存值

public class BeanInfoUtil2 {
	public static void setPropertyByIntrospector(Object userInfo,  
            Map<String,Object> map) throws Exception {  
			//map  key=name  value=value
        BeanInfo beanInfo = Introspector.getBeanInfo(userInfo.getClass());  
        PropertyDescriptor[] proDescrtptors = beanInfo.getPropertyDescriptors();  
        if (proDescrtptors != null && proDescrtptors.length > 0) {  
            for (PropertyDescriptor propDesc : proDescrtptors) {  
            	Method method = propDesc.getWriteMethod();
            	if (null==method) {
					continue;
				}
                for (String keys : map.keySet()) {
					if (method.getName().equals("set"+keys)) {
						method.invoke(userInfo, map.get(keys));
					}
				}
            }  
        }  
    }  
}

　　　　测试类

                Student s=new Student();
		Map<String,Object> map=new HashMap<String,Object>();
		map.put("Name", "张三");
		map.put("Age", 15);
		BeanInfoUtil2.setPropertyByIntrospector(s, map);
		System.out.println(s.getName());
		System.out.println(s.getAge());