反照获取对象的属性值

反射获取对象的属性值

Java代码

1 > bean对象

package com.whbs.bean;

?

public class UserBean {

??? private Integer id;

??? private int age;

??? private String name;

??? private String address;

???

??? public UserBean(){

?????? System.out.println("实例化");

??? }

???

??? public Integer getId() {

?????? return id;

??? }

??? public void setId(Integer id) {

?????? this.id = id;

??? }

??? public int getAge() {

?????? return age;

??? }

??? public void setAge(int age) {

?????? this.age = age;

??? }

??? public String getName() {

?????? return name;

??? }

??? public void setName(String name) {

?????? this.name = name;

??? }

??? public String getAddress() {

?????? return address;

??? }

??? public void setAddress(String address) {

?????? this.address = address;

??? }

???

???

???

}

?

2 > 反射测试

?

package com.whbs.test;

?

import java.lang.reflect.Field;

import java.lang.reflect.Method;

?

import com.whbs.bean.UserBean;

?

public class Test1 {

?

??? public static void main(String[] args) throws Exception {

?

??????

?????? /*

?????? ?* 实列化类 方法1

?????? ?*/

?????? //String classPath = "com.whbs.bean.UserBean";

?????? //Class cla = Test1.class.getClassLoader().loadClass(classPath);

?????? //Object ob = cla.newInstance();

??????

?????? /*

?????? ?* 实列化类 方法2

?????? ?*/

?????? UserBean bean = new UserBean();

?????? bean.setId(100);

?????? bean.setAddress("武汉");

??????

?????? //得到类对象

?????? Class userCla = (Class) bean.getClass();

??????

?????? /*

?????? ?* 得到类中的所有属性集合

?????? ?*/

?????? Field[] fs = userCla.getDeclaredFields();

?????? for(int i = 0 ; i < fs.length; i++){

?????????? Field f = fs[i];

?????????? f.setAccessible(true); //设置些属性是可以访问的

?????????? Object val = f.get(bean);//得到此属性的值???

??????

?????????? System.out.println("name:"+f.getName()+"/t value = "+val);

??????????

?????????? String type = f.getType().toString();//得到此属性的类型

?????????? if (type.endsWith("String")) {

????????????? System.out.println(f.getType()+"/t是String");

????????????? f.set(bean,"12") ;?? ???? //给属性设值

?????????? }else if(type.endsWith("int") || type.endsWith("Integer")){

????????????? System.out.println(f.getType()+"/t是int");

????????????? f.set(bean,12) ;? ???? //给属性设值

?????????? }else{

????????????? System.out.println(f.getType()+"/t");

?????????? }

??????????

?????? }

??????

??????

?????? /*

?????? ?* 得到类中的方法

?????? ?*/

?????? Method[] methods = userCla.getMethods();

?????? for(int i = 0; i < methods.length; i++){

?????????? Method method = methods[i];

?????????? if(method.getName().startsWith("get")){

????????????? System.out.print("methodName:"+method.getName()+"/t");

????????????? System.out.println("value:"+method.invoke(bean));//得到get 方法的值

?????????? }

?????? }

??? }

?

}