【内省】introspector操作JavaBean

package com.xiaozhi.introspector;

//该类共有5个属性
public class Person {
private String name;
private String password;
private int age;
public void setAb(int a){

}
public String getName() {
return name;
}
public String getPassword() {
return password;
}
public int getAge() {
return age;
}
public void setName(String name) {
this.name = name;
}
public void setPassword(String password) {
this.password = password;
}
public void setAge(int age) {
this.age = age;
}

}

package com.xiaozhi.introspector;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

public class Test {

public static void main(String[] args) throws Exception {
//得到所有的属性
//		// 这样得到的属性包括Object的属性：Class
//		BeanInfo beanInfo1 = Introspector.getBeanInfo(Person.class);
//		// 去除Object的属性
//		BeanInfo beanInfo2 = Introspector.getBeanInfo(Person.class,Object.class);
//		PropertyDescriptor[] descriptors = beanInfo1.getPropertyDescriptors();
//		for(PropertyDescriptor descriptor:descriptors)
//		{
//			System.out.println(descriptor.getName());
//		}

//操作制定属性：age
Person person=new Person();
PropertyDescriptor descriptor=new PropertyDescriptor("age",Person.class);
//获取属性的类型
System.out.println(descriptor.getPropertyType());
//得到属性的写方法，为属性赋值
Method method= descriptor.getWriteMethod();
method.invoke(person, 22);//为age赋值22

//得到属性的读方法
method=descriptor.getReadMethod();
System.out.println(method.invoke(person, null));//读取age的值22

}

}