添加普通web项目依赖

<dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>

修改配置文件（可选）

配置上传文件信息

  http:  
    multipart:  
      # 最大支持文件大小 即单个文件大小  
      max-file-size: 2m  
      # 最大支持请求大小 即一次性上传的总文件大小  
      max-request-size: 10m

使用

package Cc.LiSen.Controllers;  
  
import com.sun.jmx.snmp.agent.SnmpMibAgent;  
import org.slf4j.Logger;  
import org.slf4j.LoggerFactory;  
import org.springframework.web.bind.annotation.PostMapping;  
import org.springframework.web.bind.annotation.RequestParam;  
import org.springframework.web.bind.annotation.ResponseBody;  
import org.springframework.web.bind.annotation.RestController;  
import org.springframework.web.multipart.MultipartFile;  
  
import javax.servlet.http.HttpServletRequest;  
import java.io.File;  
import java.io.IOException;  
import java.nio.file.Paths;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
  
@RestController  
public class J2EEFileUpload {  
    private static final Logger logger = LoggerFactory.getLogger(J2EEFileUpload.class);  
  
    @PostMapping("/upload")  
    @ResponseBody  
    public String UploadFile(@RequestParam MultipartFile file, HttpServletRequest request) throws IOException {  
        if (file.isEmpty()) {  
            return "上传文件不能为空";  
        }  
        String fileType = file.getContentType();  
        String fileName = file.getName();  
        String originalName = file.getOriginalFilename();  
        long fileSize = file.getSize();  
        logger.info("原始文件名为：" + originalName);  
        logger.info("服务器文件名为：" + fileName);  
        logger.info("文件大小为：" + String.valueOf(fileSize));  
        String fileSavePath = request.getServletContext().getRealPath("/static/upload/");  
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-ddd");  
        fileSavePath = fileSavePath + simpleDateFormat.format(new Date())+"//";  
        fileSavePath = fileSavePath.replace("//",File.separator);  
        File saveFile = new File(fileSavePath+originalName);  
        if(!saveFile.getParentFile().exists()){  
            saveFile.getParentFile().mkdirs();  
        }  
        file.transferTo(saveFile);  
        return "上传成功";  
    }  
}