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 }
