反射-私有变量/私有方法-Java

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Created with IDEA
 * author:foreign
 * Date:2019/9/30
 * Time:10:40
 */
public class ReflectionFk {
    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        PersonFk personFk = new PersonFk();
        personFk.setName("foreign");

        Class clazz = PersonFk.class;
        //1 获取全部private变量
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field field : declaredFields) {
            field.setAccessible(true);
            System.out.println("获取private字段：" + field);
        }
        //1.1 获取指定的private变量
        Field name = clazz.getDeclaredField("name");
        name.setAccessible(true);
        String str = (String) name.get(personFk);
        System.out.println("name字段值：" + str);

        //2 获取全部private方法
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method method : declaredMethods) {
            method.setAccessible(true);
            System.out.println("获取private方法: " + method);
        }
        //2.1 获取指定private方法
        PersonFk personFk1 = new PersonFk("123");
        Method getDepartmentId = clazz.getDeclaredMethod("getDepartmentId", null);
        getDepartmentId.setAccessible(true);
        String returnStr = (String) getDepartmentId.invoke(personFk1, null);
        System.out.println("获取指定的private方法：" + returnStr);
    }
}

实体类

/**
 * Created with IDEA
 * author:foreign
 * Date:2019/9/30
 * Time:10:39
 */
public class PersonFk {
    private String name;
    private Integer age;
    private Boolean gender;
    public String desc;
    private String departmentId;

    public PersonFk(String name, Integer age, Boolean gender, String desc, String departmentId) {
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.desc = desc;
        this.departmentId = departmentId;
    }

    public PersonFk(String departmentId) {
        this.departmentId = departmentId;
    }

    public PersonFk() {
    }

    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;
    }

    public Boolean getGender() {
        return gender;
    }

    public void setGender(Boolean gender) {
        this.gender = gender;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    private String getDepartmentId() {
        return departmentId;
    }

    public void setDepartmentId(String departmentId) {
        this.departmentId = departmentId;
    }
}