java反射之-Javabean与Map的互转

1.BeanUntils工具类的准备

/**
 * @ClassName: BeanUtils
 * @Description:
 * @Author: songwp
 * @Date: 9:02 2022/5/19
 **/
public class BeanUtils {

    /**
     * 将javaBean转换成Map
     * @param bean
     * @return
     * @throws Exception
     */
    public static Map<String,Object> beanToMap(Object bean) throws Exception {
        Map<String,Object> map = new HashMap<>();
        BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass(), Object.class);
        PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor pd : pds) {
            String name = pd.getName();
            Object value = pd.getReadMethod().invoke(bean);
            map.put(name,value);
        }
        return map;
    }

    /**
     * 将Map转成javaBean
     * @param map
     * @param beanType
     * @param <T>
     * @return
     * @throws Exception
     */
    public static <T> T mapToBean(Map<String,Object> map,Class<T> beanType) throws Exception {
        // 创建javaBean对象
        Object obj = beanType.newInstance();
        BeanInfo beanInfo = Introspector.getBeanInfo(beanType, Object.class);
        PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor pd : pds) {
            // 从Map中获取属性同名的key值
            Object value = map.get(pd.getName());
            // 调用setter方法设置属性值
            pd.getWriteMethod().invoke(obj,value);
        }
        return (T)obj;
    }
}

2.方法测试调用

注意：User 和 Person实体需要自己创建（person的属性和map中的key要有对应）

/**
 * @ClassName: Test9
 * @Description:
 * @Author: songwp
 * @Date: 9:23 2022/5/19
 **/
public class Test9 {

    public static void main(String[] args) throws Exception {
        //1.map转JavaBean
        Map<String,Object> map = new HashMap<>();
        map.put("name","李四");
        map.put("age","28");
        map.put("address","陕西西安");
        Object user1 = BeanUtils.mapToBean(map, Person.class);
        System.out.println(user1);

        System.out.println("================================================================");

        //2. javabean转map
        User user = new User();
        user.setId("10001");
        user.setStatus(0);
        user.setPhone("18740458584");
        user.setNickname("张三");
        Map<String, Object> map1 = BeanUtils.beanToMap(user);
        System.out.println(map1);
    }
}

3.结果如下：

-----------------------------------------------------------------------------
Person(name=李四, age=28, address=陕西西安)
================================================================
{birthday=null, password=null, gender=null, phone=18740458584, nickname=张三, remark=null, id=10001, age=null, status=0, username=null}
-----------------------------------------------------------------------------