对象比较器

 * 比较结果eg：1、字段名称name,旧值:111,新值:222;2、字段名称address,旧值:222,新值:111,修改时间:2020-07-27 17:33:59

定义接口类

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author fj
 * @version 1.0
 * @date 2020/7/29 15:07
 */
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface OperateLogAnnotation {
    String name() default "";
}

比较方法

package com.jkhh.provider.util;

import com.jkhh.common.core.support.UserHolder;
import com.jkhh.common.util.DateUtil;
import com.jkhh.provider.pojo.domain.project.Customer;
import io.swagger.annotations.ApiModelProperty;
import org.springframework.stereotype.Component;

import javax.persistence.Column;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @author fj
 * @version 1.0
 * @date 2020/7/27 17:23
 */
@Component
public class OperateLogUtil<T> {

    /**
     * 对象比较器
     * 比较结果eg：1、字段名称name,旧值:111,新值:222;2、字段名称address,旧值:222,新值:111,修改时间:2020-07-27 17:33:59
     * @param oldBean
     * @param newBean
     * @return
     */
    public  String compareObject(Object oldBean, Object newBean) {
        String str = "";

        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) {
                if ("serialVersionUID".equals(field.getName())) {
                    continue;
                }
                String name = "";
                //如果存在该注解
                if(field.isAnnotationPresent(OperateLogAnnotation.class)){
                    OperateLogAnnotation dt = field.getAnnotation(OperateLogAnnotation.class);
                    System.out.println("DatabaseField="+dt.name());
                    name = dt.name();
                }else{
                    name  = field.getName();
                }


                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 += ";";
                    }
                    str +=  i + " 修改了" + name + "：修改前:" + o1 + "，修改后:" + o2;
                    i++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return str;
    }


    public static void main(String[] args) {
        Customer customer = new Customer();
        customer.setName("111");
        customer.setAddress("222");

        Customer customer1 = new Customer();
        customer1.setName("222");
        customer1.setAddress("111");

        OperateLogUtil logUtil = new OperateLogUtil();
        String str = logUtil.compareObject(customer,customer1);
        System.out.println(str);
    }
}