map和bean相互转换

map和bean的相互转换需要使用jar包maven地址：

<dependency>
    <groupId>commons-beanutils</groupId>
    <artifactId>commons-beanutils</artifactId>
</dependency>

map和bean相互转换的工具类方法：

public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {    
        if (map == null)  
            return null;  
        Object obj = beanClass.newInstance();  
        BeanUtils.populate(obj, map);  
        return obj;  
    }    
    public static Map<?, ?> objectToMap(Object obj) {  
        if(obj == null)  
            return null;   
        return new BeanMap(obj);  
    }

测试方法：

public static void main(String[] args) {
        Map<String, Object> map = new HashMap<>();
        map.put("age", 12);
        map.put("name", "张三");
        try {
            User user = (User) mapToObject(map, User.class);
            System.err.println(user.toString());
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        User user1 = new User();
        user1.setAge(22);
        user1.setName("李四");
        @SuppressWarnings("unchecked")
        Map<String , Object> map2 = (Map<String, Object>) objectToMap(user1);
        System.err.println("map2:"+map2.get("age")+map2.get("name"));
    }

测试中需要一个bean：User.java

public class User {
    private String name;
    private Integer age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "User [name=" + name + ", age=" + age + "]";
    }

}