Java gets the attribute name and attribute value of the entity class

What is Field

Field is a class located under the java.lang.reflect package. In Java reflection, the Field class describes the attribute information of the class, and its functions include:

• Get the type of the member variable of the current object
• reset member variable

Field common methods

getType()： 获取属性声明时类型对象（返回class对象）

getGenericType() ： 返回属性声的Type类型

getName() ： 获取属性声明时名字

getAnnotations() ： 获得这个属性上所有的注释

getModifiers() ： 获取属性的修饰

isEnumConstant() ： 判断这个属性是否是枚举类

isSynthetic() ： 判断这个属性是否是 复合类

get(Object obj) ： 取得obj对象这个Field上的值

set(Object obj, Object value) ： 向obj对象的这个Field设置新值value

Field gets the attribute name and attribute value of the entity class

1. Get the entity class and return an array. The data of the array is the field in the entity class
2. Add setAccessible() because the field is modified with private
3. Output attribute names and attribute values

EntityUserVO

/**
 * @Author charles.yao
 * @Description
 * @Date 2022/12/26 22:45
 */
public class UserVO {
    private String name;
    private String lastName;
    private Integer age;

    public UserVO(String name, String lastName, Integer age) {
        this.name = name;
        this.lastName = lastName;
        this.age = age;
    }

    public UserVO() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

test class

/**
 * @Author charles.yao
 * @Description
 * @Date 2022/12/26 22:46
 */
public class Test {
    public static void main(String[] args) {
        UserVO userVO  =new UserVO();
        userVO.setAge(11);
        userVO.setLastName("老张");
        userVO.setName("小名");
        //获取useroVo所有字段
        Field[] fields = userVO.getClass().getDeclaredFields();
        try {
            for (Field field : fields) {
                field.setAccessible(true);
                System.out.println("字段名称"+field.getName()+"=字段值"+field.get(userVO));
            }
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

operation result

字段名称name====字段值小名
字段名称lastName====字段值老张
字段名称age====字段值11