day27(反射之内省机制实现BeanUtils)

 

　　　　使用内省方式来实现beanUtils往对象里面存值

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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

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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());