操作审计记录

实现记录操作日志的功能，用自定义元注解能灵活控制不需要比较哪些字段、字段名称如何显示等思路，代码如下:

1.定义自定义元注释

/**
 * @author huangzhihua
 * @date 2020/11/9
 */
@Documented
@Target({ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface Description {

    public String name() default "";

    public boolean ignore() default false;

}

2.在java对应实体类中添加注释

import com.example.demo.log.Description;
import lombok.Builder;
import lombok.Data;

/**
 * @author huangzhihua
 * @date 2020/11/7
 */
@Data
@Builder
public class UserVO {

    @Description(name = "id", ignore = true)
    public long id;

    @Description(name = "姓名")
    private String name;

    @Description(name = "年龄")
    private Integer age;

    @Description(name = "描述")
    private String desc;
}

3.基于反射实现的对象比较

/**
 * @author huangzhihua
 * @date 2020/11/7
 */
public class CompareUtils<T> {

    /**
     * 对象比较器
     *
     * @param oldBean
     * @param newBean
     * @return
     */
    public String contrastObj(Object oldBean, Object newBean) {
        String str = "";
        //if (oldBean instanceof SysConfServer && newBean instanceof SysConfServer) {
        T pojo1 = (T) oldBean;
        T pojo2 = (T) newBean;
        try {
            Class clazz = pojo1.getClass();
            Field[] fields = pojo1.getClass().getDeclaredFields();
            int i = 1;
            for (Field field : fields) {
                //获取字段注释信息
                Description description = (Description) field.getAnnotation(Description.class);
                // 注解中忽略的字段
                if (description == null || description.ignore()) {
                    continue;
                }
                if ("serialVersionUID".equals(field.getName())) {
                    continue;
                }
                PropertyDescriptor pd = new PropertyDescriptor(field.getName(), clazz);
                Method getMethod = pd.getReadMethod();
                Object o1 = getMethod.invoke(pojo1);
                Object o2 = getMethod.invoke(pojo2);
                if (o1 == null || o2 == null) {
                    continue;
                }
                if (!o1.toString().equals(o2.toString())) {
                    if (i != 1) {
                        str += ";\n";
                    }
                    str += i + "、字段名称:" + description.name() + ",旧值:" + o1 + ",新值:" + o2;
                    i++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // }
        return str;
    }

4.测试运行

 UserVO user1 = UserVO.builder().name("jack").age(19).desc("my name").build();
    UserVO user2 = UserVO.builder().name("rose").age(18).desc("my name").build();

@Test
    void test(){
        System.out.println(new CompareUtils<UserVO>().contrastObj(user1,user2));
    }

Java对象比较器，详细记录对象前后变化的方法

使用java反射和AOP对比两个对象的属性来实现修改操作日志记录功能