内省操作javabean的属性

 1 import java.beans.BeanInfo;
 2 import java.beans.IntrospectionException;
 3 import java.beans.Introspector;
 4 import java.beans.PropertyDescriptor;
 5 import java.lang.reflect.Method;
 6
 7 import org.junit.Test;
 8
 9 //使用内省api操作bean的属性
10 public class Demo {
11
12     /**
13      *
14      * @throws Exception
15      *
16      */
17     //得到bean的所有属性
18     @Test
19     public void test1() throws Exception{
20         BeanInfo info = Introspector.getBeanInfo(Person.class,Object.class);
21
22         PropertyDescriptor[] pds = info.getPropertyDescriptors();
23
24         for(PropertyDescriptor pd : pds){
25             System.out.println(pd.getName());
26         }
27     }
28
29     //操纵bean的指定属性:age
30     @Test
31     public void test2() throws Exception{
32
33         Person p = new Person();
34
35         PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);
36
37         //得到属性的写方法，为属性复制
38         Method method = pd.getWriteMethod();//public void setAge(){}
39
40         method.invoke(p, 32);
41
42         //获取属性的值
43         method = pd.getReadMethod();//public void getAge(){}
44         System.out.println(method.invoke(p, null));
45
46
47     }
48
49     //高级点的内容，获取当前操作属性的类型
50     @Test
51     public void test3() throws Exception{
52
53         Person p = new Person();
54
55         PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);
56
57         System.out.println(pd.getPropertyType());
58     }
59
60
61 }

 1 public class Person {// javabean
 2
 3     private String name;
 4     private String password;
 5     private int age;
 6
 7     public String getName() {
 8         return name;
 9     }
10
11     public void setName(String name) {
12         this.name = name;
13     }
14
15     public String getPassword() {
16         return password;
17     }
18
19     public void setPassword(String password) {
20         this.password = password;
21     }
22
23     public int getAge() {
24         return age;
25     }
26
27     public void setAge(int age) {
28         this.age = age;
29     }
30
31     public String getAb(){
32         return null;
33     }
34
35
36 }

内省操作javabean的属性