内省 (操作javabean的属性)

 1 package introspector;
 2 
 3 public class person {   //javabean
 4     private String name;//字段
 5     private int age;//字段
 6     private String password;//字段
 7     
 8     public String getName()
 9     {
10         return name;
11         
12     }
13     public int getAge()
14     {
15         return age;
16         
17     }
18     public String getPassword()
19     {
20         return password;
21         
22     }
23     public void setName(String name)
24     {
25         this.name=name;
26     }
27     public void setAge(int age)
28     {
29         this.age=age;
30     }
31     public void setPassword(String password)
32     {
33         this.password=password;
34     }
35 
36 }
 1 package introspector;
 2 
 3 import java.beans.BeanInfo;
 4 import java.beans.IntrospectionException;
 5 import java.beans.Introspector;
 6 import java.beans.PropertyDescriptor;
 7 import java.lang.reflect.Method;
 8 
 9 import org.junit.Test;
10 
11 //使用内省api操作bean的属性
12 public class demo {
13     //得到bean的所有属性
14     @Test
15     public void test1() throws Exception
16     {
17         BeanInfo info=Introspector.getBeanInfo(person.class,Object.class);//得到bean自己的属性
18         PropertyDescriptor[] pds=info.getPropertyDescriptors();
19         for(PropertyDescriptor pd:pds)
20         {
21             System.out.println (pd.getName());
22         }
23     }
24     //操作bean的所有属性
25         @Test
26         public void test2() throws Exception
27         {
28             person p=new person();
29             PropertyDescriptor pd=new PropertyDescriptor("age",person.class);
30             //得到属性的写方法,为属性赋值
31             Method method=pd.getWriteMethod();
32             method.invoke(p, 45);
33             //获取属性的值1
34             System.out.println(p.getAge());
35             //获取属性的值2(和一功能一样)
36             method=pd.getReadMethod();
37             System.out.println(method.invoke(p, null));
38             
39             
40         }
41         //高级点内容,获取当前操作的属性的类型
42                 @Test
43                 public void test3() throws Exception
44                 {
45                     person p=new person();
46                     PropertyDescriptor pd=new PropertyDescriptor("age",person.class);
47                     System.out.println(pd.getPropertyType());
48                     
49                 }
50 
51 }
原文地址:https://www.cnblogs.com/jjlovemm/p/4250861.html