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}-----------------------------------------------------------------------------