Javassm - item1-5 (菜品管理模块1)

package com.sky.annotation;

import com.sky.enumeration.OperationType;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 自定义注解，用于标识某个方法需要进行功能字段自动填充处理
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AutoFill {
    //数据库操作类型：UPDATE INSERT
    OperationType value();
}

package com.sky.enumeration;

/**
 * 数据库操作类型
 */
public enum OperationType {

    /**
     * 更新操作
     */
    UPDATE,

    /**
     * 插入操作
     */
    INSERT
}

package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }

        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            //为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            //为2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

protected void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/doc.html").addResourceLocations("classpath:/META-INF/resources/");
    registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    registry.addResourceHandler("/static/**").addResourceLocations("file:E:/java_items/sky-take-out/sky-server/src/main/resources/static/");
}

package com.sky.controller.admin;

import com.sky.constant.MessageConstant;
import com.sky.result.Result;
import io.swagger.annotations.Api;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.UUID;

@RestController
@RequestMapping("/admin/common")
@Api(tags = "通用接口")
@Slf4j
public class CommonController {

    private static String FILE_UPLOAD_PATH = "E:\\java_items\\sky-take-out\\sky-server\\src\\main\\resources\\static\\";

    @PostMapping("/upload")
    @ResponseBody
    public Result<String> upload(MultipartFile file) {
        if(file.isEmpty()) {
            return Result.error("文件不能为空");
        }
        File dir = new File(FILE_UPLOAD_PATH);
        if (!dir.exists() || !dir.isDirectory()) {
            boolean created = dir.mkdirs();
            if(created) {
                log.info("创建文件夹成功: {}", FILE_UPLOAD_PATH);
            } else {
                log.warn("创建文件夹失败或已经存在: {}", FILE_UPLOAD_PATH);
            }
        }

        String originalFilename = file.getOriginalFilename();
        if (originalFilename == null || originalFilename.isEmpty()) {
            return Result.error("文件名无效");
        }
        // 获取后缀
        String extension = originalFilename.substring(originalFilename.lastIndexOf("."));
        if (!extension.equalsIgnoreCase(".png") && !extension.equalsIgnoreCase(".jpg") && !extension.equalsIgnoreCase(".jpeg")) {
            return Result.error("文件格式不支持");
        }
        // 拼接新的随机名称
        originalFilename = UUID.randomUUID().toString() + extension;

        // 确保文件路径安全，避免路径遍历攻击
        Path targetLocation = Paths.get(FILE_UPLOAD_PATH).resolve(originalFilename).normalize();
        try {
            Files.copy(file.getInputStream(), targetLocation, StandardCopyOption.REPLACE_EXISTING);
            log.info("文件上传成功: {}", originalFilename);
        } catch (IOException e) {
            log.error("文件上传失败: {}", originalFilename, e);
            return Result.error(MessageConstant.UPLOAD_FAILED);
        }

        // 你可以根据实际情况调整返回的文件访问链接
        String fileUrl = "http://localhost:8080/static/" + originalFilename;
        return Result.success(fileUrl);
    }
}