springboot实现图片上传和图片删除

图片上传主要将需要上传的图片上传到对应的存储地址当中，再通过url访问图片就可以了；本文存储地址在本地，如果是在服务器上，配置服务器端的地址就可以了。

@ApiOperation(value = "图片上传", notes = "图片上传")
    @PostMapping(value = "uploadCommodity")
    public Result uploadImg(@RequestParam("file") List fileList, HttpServletRequest request) {
        return Result.ok(appBasicServiceImpl.uploadImg(fileList, request));
    }

package com.andis.app.service.impl;

import com.andis.app.dao.AppBasicDao;
import com.andis.app.dto.AppBasicInfo;
import com.andis.app.service.AppBasicService;
import com.andis.app.util.UploadUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.List;


@Service("appBasicServiceImpl")
public class AppBasicServiceImpl extends ServiceImpl implements AppBasicService {
    //获取根路径
    @Value("${file.path}")
    private String dirPath;

    
    @Override
    public HashMap uploadImg(List fileList, HttpServletRequest request) {
        if (UploadUtil.checkImg(fileList)){
            HashMap hashMap=UploadUtil.upload(fileList,request,dirPath);
            return hashMap;
        }else {
            HashMap hashMap=new HashMap();
            hashMap.put("error","请上传bmp/gif/jpg/png格式的图片");
            return hashMap;
        }
    }
}

package com.andis.app.util;

import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import java.awt.*;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.List;


public class UploadUtil {
    
    public static Boolean checkImg(List fileList) {
        if (fileList.isEmpty()) {
            return false;
        } else {
            for (MultipartFile file : fileList) {
                try {
                    //通过ImageIO检查是否是 bmp/gif/jpg/png图片
                    Image image = ImageIO.read(file.getInputStream());
                    return image != null;
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
            }
            return false;
        }
    }

    
    public static HashMap upload(List fileList, HttpServletRequest request, String dirPath){
        //定义URI地址
        String fileDownloadUri="";
        String fileNamePlus="";
        HashMap urlMap=new HashMap<>();
        for (MultipartFile file: fileList) {
            // 获取文件名
            String fileName = file.getOriginalFilename();
            //创建文件
            File dest = new File(dirPath+fileName);
            //判断文件父目录是否存在
            if(!dest.getParentFile().exists()){
                dest.getParentFile().mkdirs(); //这里因为创建的是多级目录，所以需要使用mkdirs()方法。使用mkdir()方法则文件夹创建不成功，会报找不到路径错误。
            }
            try {
                //将文件内容写入创建的文件中
                file.transferTo(dest);
                //获得本机Ip（获取的是服务器的Ip）
                InetAddress inetAddress=InetAddress.getLocalHost();
                String ip=inetAddress.getHostAddress();
                //URL地址的格式：http://ip:port/app/文件路径
                fileDownloadUri=request.getScheme()+"://"+ ip+":"+request.getServerPort()+"/app/upload/"+fileName;
                fileNamePlus=dirPath+fileName;
//                if (fileDownloadUri==""){
//                    fileDownloadUri=request.getScheme()+"://"+ ip+":"+request.getServerPort()+"/app/upload/"+fileName;
//                    fileNamePlus=dirPath+fileName;
//                }else {
//                    fileDownloadUri=fileDownloadUri+","+request.getScheme()+"://"+ ip+":"+request.getServerPort()+"/app/upload/"+fileName;
//                    fileNamePlus=dirPath+fileName+","+dirPath+fileName;
//                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            urlMap.put("source",fileNamePlus);
            urlMap.put("target",fileDownloadUri);
        }
        //返回Url地址，以逗号分隔
        return urlMap;
    }

    
    public static boolean deleteFiles(String pathName){
        boolean flag = false;
        //根据路径创建文件对象
        File file = new File(pathName);
        //路径是个文件且不为空时删除文件
        if(file.isFile()&&file.exists()){
            flag = file.delete();
        }
        //删除失败时，返回false
        return flag;
    }
}

package com.andis.app.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;


@Configuration
public class WebConfig implements WebMvcConfigurer {
    
    @Value("${file.path}")
    private String fileSavePath;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        
        registry.addResourceHandler("/upload/**")
                .addResourceLocations("file:"+fileSavePath);
    }
}

#文件上传根路径
server:
  port: 8081
  servlet:
    context-path: /app

file:
  path: D://upload/

使用postman测试

删除图片，将source中的路径传到工具类当中的删除文件方法中就可以了。