模拟BeanUtils.populate(Object bean, Map properties)的简单实现

通过调用静态方法populate可以用map给bean赋值,简单创建个模型,模拟一下实现. 用的都是最简单的模型.

创建3个类

UserBean: 模拟Object bean

MyPopulate: 模拟populate实现方法

Test:主程序

1.UserBean

package com.itcast.test;

public class UserBean {
    private String name;                //姓名
    private String age;                   //年龄
    private String gender;              //性别           
    private String addr;                  //地址
    
    @Override
    public String toString() {
        return "UserBean [name=" + name + ", age=" + age + ", gender=" + gender + ", addr=" + addr + "]";
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getAddr() {
        return addr;
    }
    public void setAddr(String addr) {
        this.addr = addr;
    }
}

2.MyPopulate

package com.itcast.test;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

public class MyPopulate {
	UserBean bean = new UserBean();
	Map<String, String> map = new HashMap<String, String>();
	
	void myPopulate(UserBean bean, Map<String, String> map) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{

		Class beanClass = bean.getClass();
		//通过反射获取bean里面的方法
		Method md[] = beanClass.getMethods();
		//遍历bean里面所有的方法
		for (Method method : md) {
			String name = method.getName();
			//遍历map里面的所有键值对
			for(Map.Entry<String, String> entry: map.entrySet()){
				//判断map键与方法名相关的,如果有,将map中的值传入方法,相当于给bean里的属性赋值
				if(("set"+entry.getKey()).equalsIgnoreCase(name)){
					System.out.println("***"+name+"***");
					Method md02 = beanClass.getMethod(name, String.class); 
                    //执行setXXX方法
					md02.invoke(bean, entry.getValue());
				}
				//System.out.println(entry.getKey() + "    " + entry.getValue());
			}
			//System.out.println(name);
		}
	}
}

3.Test

package com.itcast.test;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

public class Test {

	public static void main(String[] args) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		MyPopulate mpop = new MyPopulate();
		UserBean bean = new UserBean();
		Map<String, String> map = new HashMap<String, String>();
		map.put("name", "zhangsan");
		map.put("age", "18");
		map.put("gender", "male");
		map.put("addr", "beijing");
		mpop.myPopulate(bean, map);
		System.out.println(bean.toString());
	}
}

输出结果:

***setAge***
***setGender***
***setAddr***
***setName***
UserBean [name=zhangsan, age=18, gender=male, addr=beijing]

通过反射获取bean对象里的所有方法,将方法名与map键名进行比对,有相关的就通过反射调用此方法名的方法,实现setXXX给bean对象属性赋值.

标签：Map,String,populate,map,Object,UserBean,bean,public,name
来源： https://blog.csdn.net/zaomengzhe666777/article/details/120453651