如何处理 MaxUploadSizeExceededException [英] How to handle MaxUploadSizeExceededException
本文介绍了如何处理 MaxUploadSizeExceededException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
MaxUploadSizeExceededException 当我上传的文件大小超过允许的最大值时出现异常.我想在出现此异常时显示错误消息(如验证错误消息).如何处理此异常以在 Spring 3 中执行此类操作?
MaxUploadSizeExceededException exception appears when I upload a file whose size exceeds the maximum allowed. I want to show an error message when this exception appears (like a validation error message). How can I handle this exception to do something like this in Spring 3?
谢谢.
推荐答案
我终于找到了一个使用 HandlerExceptionResolver 的解决方案.
I finally figured out a solution that works using a HandlerExceptionResolver.
将多部分解析器添加到您的 Spring 配置:
<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 - UploadedFile.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 -/upload.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>
控制器 - FileUploadController.java:包 com.mypkg.controllers;
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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