目标

记录实体类属性的变化

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package com.scjt.jypm.project.annotation;

public enum CompareType {
    DEFAULT, // 默认直接比较
    USER_NICKNAME, // 根据ID查找用户昵称
    BOOLEAN_TO_TEXT, // 0/1 转换为 否/是
    DICTIONARY, // 字典类型比较
    DATE // 时间格式化比较
}

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package com.scjt.jypm.project.annotation;

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

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface LogField {
    String name(); // 字段名称
    CompareType type() default CompareType.DEFAULT; // 比较类型
    String dictType() default ""; // 字典类型（仅 DICTIONARY 类型使用）
}

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package com.scjt.jypm.project.util;

import com.scjt.jypm.project.annotation.CompareType;
import com.scjt.jypm.project.annotation.LogField;
import com.scjt.jypm.system.mapper.SysDictTypeMapper;
import com.scjt.jypm.system.mapper.SysUserMapper;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

public class LogHelper {

    private final SysUserMapper sysUserMapper;
    private final SysDictTypeMapper sysDictTypeMapper;

    public LogHelper(SysUserMapper sysUserMapper, SysDictTypeMapper sysDictTypeMapper) {
        this.sysUserMapper = sysUserMapper;
        this.sysDictTypeMapper = sysDictTypeMapper;
    }

    private String formatValue(Object value, CompareType type, String dictType) {
        if (value == null) {
            return "空";
        }
        switch (type) {
            case USER_NICKNAME:
                return getUserNickname(String.valueOf(value));
            case BOOLEAN_TO_TEXT:
                return "1".equals(value) ? "是" : "否";
            case DICTIONARY:
                return getDictName(dictType, String.valueOf(value));
            case DATE:
                return value.toString(); // 直接调用 toString
            default:
                return value.toString();
        }
    }

    private String getUserNickname(String userId) {
        return Optional.ofNullable(userId)
                .flatMap(id -> Optional.ofNullable(sysUserMapper.getNickNameById(id)))
                .orElse("未知用户");
    }

    private String getDictName(String dictType, String value) {
        return Optional.ofNullable(value)
                .flatMap(l -> Optional.ofNullable(sysDictTypeMapper.selectDictTypeByTypeAndValue(dictType,value).getDictLabel()))
                .orElse("空");
    }

    public <T> List<String> compareObjects(T oldData, T newData) throws IllegalAccessException {
        List<String> changeLog = new ArrayList<>();
        Class<?> clazz = oldData.getClass();

        for (Field field : clazz.getDeclaredFields()) {
            if (field.isAnnotationPresent(LogField.class)) {
                field.setAccessible(true);
                LogField logField = field.getAnnotation(LogField.class);
                String fieldName = logField.name();
                CompareType type = logField.type();
                String dictType = logField.dictType();
                Object oldValue = field.get(oldData);
                Object newValue = field.get(newData);

                String formattedOldValue = formatValue(oldValue, type, dictType);
                String formattedNewValue = formatValue(newValue, type, dictType);

                if (!Objects.equals(formattedOldValue, formattedNewValue)) {
                    changeLog.add(String.format("[%s] 从 %s 修改为 %s", fieldName,
                            defaultIfEmpty(formattedOldValue), defaultIfEmpty(formattedNewValue)));
                }
            }
        }
        return changeLog;
    }

    private String defaultIfEmpty(String value) {
        return (value == null || value.isEmpty()) ? "空" : value;
    }
}

数据库

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  CREATE TABLE `prj_operation_log` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `prj_number` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '项目编号',
  `operation_type` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '操作类型',
  `operator` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '操作人',
  `operation_info` json DEFAULT NULL COMMENT '操作信息',
  `create_time` datetime DEFAULT NULL COMMENT '创建日期',
  `update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新日期',
  `log_type` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '日志类型（字典 project_log_type）',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=64 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='项目库详情操作日志表';