用内省来操作Bean会给程序带来很大的便利,特别是在很大的实体对象的时候,在其属性很多的时候要为其赋值的时候,

package com.bean;

public class User {

private String uid;

private String userName;

private String userPass;

private String age;

private String sex;

public User(){}

public String getUid() {

return uid;

}

public void setUid(String uid) {

this.uid = uid;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getUserPass() {

return userPass;

}

public void setUserPass(String userPass) {

this.userPass = userPass;

}

public String getAge() {

return age;

}

public void setAge(String age) {

this.age = age;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public User(String uid, String userName, String userPass, String age,

String sex) {

super();

this.uid = uid;

this.userName = userName;

this.userPass = userPass;

this.age = age;

this.sex = sex;

}

@Override

public String toString() {

return "User [uid=" + uid + ", userName=" + userName + ", userPass="

+ userPass + ", age=" + age + ", sex=" + sex + "]";

}

}

package com.bean;

import java.beans.BeanInfo;

import java.beans.IntrospectionException;

import java.beans.Introspector;

import java.beans.PropertyDescriptor;

import java.lang.reflect.InvocationTargetException;

public class beanUtils {

/**

* java内省

* @param args

* @throws IntrospectionException

* @throws InvocationTargetException

* @throws IllegalArgumentException

* @throws IllegalAccessException

*/

public static void main(String[] args) throws IntrospectionException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

BeanInfo beanInfo = Introspector.getBeanInfo(User.class, Object.class);

PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();

User user = new User();

for(PropertyDescriptor pd : pds){

System.out.println(pd.getName());

}

PropertyDescriptor pd = new PropertyDescriptor("age", User.class);

pd.getWriteMethod().invoke(user, "22");

System.out.println(pd.getReadMethod().invoke(user));

}

}

age

sex

uid

userName

userPass

22