如何处理MaxUploadSizeExceedException

file-upload forms java spring spring-mvc

2022-09-01 00:50:04

MaxUploadSizeExceededException当我上传大小超过允许的最大值的文件时，出现异常。我想在出现此异常时显示错误消息（如验证错误消息）。我如何处理这个异常，以便在春季3中做这样的事情？

谢谢。

答案 1

这是一个古老的问题，所以我正在为未来的人们（包括未来的我）添加它，他们正在努力使Spring Boot 2一起工作。

首先，您需要配置spring应用程序（在属性文件中）：

spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB

如果您使用的是嵌入式Tomcat（很可能是嵌入式Tomcat），那么配置Tomcat不取消具有大体的请求也很重要。

server.tomcat.max-swallow-size=-1

或者至少将其设置为相对较大的尺寸

server.tomcat.max-swallow-size=100MB

如果您不会为Tomcat设置maxSwallowSize，您可能会浪费大量时间来调试为什么处理错误但浏览器没有响应 - 这是因为如果没有此配置，Tomcat将取消请求，即使您会在日志中看到应用程序正在处理错误，浏览器已经收到了来自Tomcat的请求取消，并且不再侦听响应。

要处理MaxUploadSizeExceedException，您可以使用AlextraveHandler添加ControrOrAdvice。

下面是 Kotlin 中的一个快速示例，它只是设置一个带有错误的 flash 属性并重定向到某个页面：

@ControllerAdvice
class FileSizeExceptionAdvice {
    @ExceptionHandler(MaxUploadSizeExceededException::class)
    fun handleFileSizeException(
        e: MaxUploadSizeExceededException, 
        redirectAttributes: RedirectAttributes
    ): String {
        redirectAttributes.addFlashAttribute("error", "File is too big")
        return "redirect:/"
    }
}

注意：如果要直接在控制器类中使用 ExceptionHandler 处理 MaxUploadSizeExceedException，则应配置以下属性：

spring.servlet.multipart.resolve-lazily=true

否则，在将请求映射到控制器之前，将触发该异常。

答案 2

我终于找到了一个使用HandlerExceptionResolver工作的解决方案。

将多部分解析器添加到您的 Spring 配置中：

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    
   <!--  the maximum size of an uploaded file in bytes -->
   <!-- <property name="maxUploadSize" value="10000000"/> -->
   <property name="maxUploadSize" value="1000"/>
</bean>

模型 - 上传文件.java：

package com.mypkg.models;

import org.springframework.web.multipart.commons.CommonsMultipartFile;

public class UploadedFile
{
    private String title;

    private CommonsMultipartFile fileData;

    public String getTitle()
    {
        return title;
    }

    public void setTitle(String title)
    {
        this.title = title;
    }

    public CommonsMultipartFile getFileData()
    {
        return fileData;
    }

    public void setFileData(CommonsMultipartFile fileData)
    {
        this.fileData = fileData;
    }

}

查看 - /上传.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
    <head>
        <title>Test File Upload</title>
    </head>
    <body>
        <h1>Select a file to upload</h1>
        <c:if test="${not empty errors}">
            <h2 style="color:red;">${errors}.</h2>
        </c:if>
        <form:form modelAttribute="uploadedFile" method="post" enctype="multipart/form-data" name="uploadedFileform" id="uploadedFileform">
            <table width="600" border="0" align="left" cellpadding="0" cellspacing="0" id="pdf_upload_form">
                <tr>
                    <td width="180"><label class="title">Title:</label></td>
                    <td width="420"><form:input id="title" path="title" cssClass="areaInput" size="30" maxlength="128"/></td>
                </tr>
                <tr>
                    <td width="180"><label class="title">File:</label></td>
                    <td width="420"><form:input id="fileData" path="fileData" type="file" /></td>
                 </tr>
                 <tr>
                    <td width="180"></td>
                    <td width="420"><input type="submit" value="Upload File" /></td>
                 </tr>
            </table>
        </form:form>
    </body>
</html>

Controller - FileUploadController.java： package com.mypkg.controllers;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import com.mypkg.models.UploadedFile;

@Controller
public class FileUploadController  implements HandlerExceptionResolver
{
    @RequestMapping(value = "/upload", method = RequestMethod.GET)
    public String getUploadForm(Model model)
    {
        model.addAttribute("uploadedFile", new UploadedFile());
        return "/upload";
    }

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public String create(UploadedFile uploadedFile, BindingResult result)
    {
        // Do something with the file
        System.out.println("#########  File Uploaded with Title: " + uploadedFile.getTitle());
        System.out.println("#########  Creating local file: /var/test-file-upload/" + uploadedFile.getFileData().getOriginalFilename());

        try
        {

            InputStream in = uploadedFile.getFileData().getInputStream();
            FileOutputStream f = new FileOutputStream(
                    "/var/test-file-upload/" + uploadedFile.getFileData().getOriginalFilename());
            int ch = 0;
            while ((ch = in.read()) != -1)
            {
                f.write(ch);
            }
            f.flush();
            f.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

        return "redirect:/";
    }

    /*** Trap Exceptions during the upload and show errors back in view form ***/
    public ModelAndView resolveException(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception exception)
    {        
        Map<String, Object> model = new HashMap<String, Object>();
        if (exception instanceof MaxUploadSizeExceededException)
        {
            model.put("errors", exception.getMessage());
        } else
        {
            model.put("errors", "Unexpected error: " + exception.getMessage());
        }
        model.put("uploadedFile", new UploadedFile());
        return new ModelAndView("/upload", model);
    }

}

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