java - Spring Boot怎么处理上传文件时出现的MultipartException

Question

在config中配置了文件的大小 {代码...} 当文件的大小超出设置值时，返回500错误 {代码...} 需要怎么做才能返回200的友好提示?

PHPz · Answer

Intercept this exception:

@ControllerAdvice
public class ExceptionProcess {
    // 对这个异常的统一处理，返回值 和Controller的返回规则一样
    @ExceptionHandler(MultipartException.class)
    public String handleAll(Throwable t){
        // TODO do sth
        return "view";
    }
}

伊谢尔伦 · Answer

1. The file upload size can be verified in the js framework. The JS upload framework uploadify.js is recommended
2. Since you use springboot, your file upload processing should be handled in the Controller.
3. If you only need error information to jump to the error page instead of printing stack information, you only need to implement a Controller implementation of @RequestMapping(value = "/error").
4. Give you a small demo of springboot uploading, which you can learn from.

/**
 * Created by Projack
 * 上传视图
 */
@Controller
@RequestMapping(value = "/admin/file")
public class FileController {

    @Value("${images.domain.url}")
    private String IMAGES_DOMAIN_URL;
    @Value("${images.localhost.url}")
    private String IMAGES_LOCALHOST_URL;

    //获取分隔符（不同系统不同）
    String sep = System.getProperty("file.separator");

    /**
     * 上传文件到七牛服务器
     * @param file
     * @return
     */
    @RequestMapping(value = "/upload")
    @ResponseBody
    public String upload(@RequestParam(value="file", required=false) MultipartFile file){
        String imgPath = "";
        try{
            String fileName = file.getOriginalFilename();
            String localPath = IMAGES_LOCALHOST_URL + sep + fileName;
            FileCopyUtils.copy(file.getBytes(), new File(localPath));     //图片保存本地服务器
            imgPath = QiNiuUtils.upload(localPath);                       //图片上传七牛云服务器
            FileSystemUtils.deleteRecursively(new File(localPath));      //删除本地服务器的图片
            imgPath = IMAGES_DOMAIN_URL + "/" + imgPath;
        }catch(Exception e){
            e.printStackTrace();
        }
        return imgPath;
    }

    /**
     * 删除文件到七牛服务器
     * @param fileName
     */
    @RequestMapping(value = "/delete")
    public void delete(String fileName){
        QiNiuUtils.delete(fileName);
    }

}

Php8, I'm coming too

Learn website layout in 30 minutes

Shangguan Oracle Beginner to Proficient Video Tutorial

Your first line of UNI-APP code

Flutter from scratch to app launch

Brother Lian New Linux Video Tutorial

AXURE 9 Video Tutorial (Suitable for Product Manager Interactive Product Design UI)

Zero Basic Proficiency PS Video Tutorial

16 day UI video tutorial to get you started

PS Techniques and Slicing Techniques Video Tutorial

Alibaba Cloud Environment Construction and Project Launch Video Tutorial

Overview of Computer Networks - Basic Knowledge that Programmers Must Master

Essential Tutorial for Programmers - HTTP Protocol Explanation

Websocket Video Tutorial