使用MultipartFile的多个文件上传在Spring Boot中不起作用,从JSP在Controller中获取空数组 [英] Multiple file upload using MultipartFile not working in Spring Boot , getting empty array in Controller from JSP
问题描述
我正在使用MultipartFile上传多个文件.但是从Jsp页面中,当我选择多个文件并单击Submit时,我在控制器中得到了空数组.
I am using MultipartFile to upload multiple files. But from Jsp page when i select multiple files and click submit, I get empty array in controller.
这是我的代码段,
在pom.xml中
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
CommonsMultipartResolver Bean配置.
CommonsMultipartResolver Bean Config.
@Bean
public CommonsMultipartResolver multipartResolver() {
CommonsMultipartResolver resolver=new CommonsMultipartResolver();
resolver.setDefaultEncoding("utf-8");
resolver.setMaxUploadSize(999999999);
return resolver;
}
JSP代码
<form:form method="POST" action="/createRequest"
enctype="multipart/form-data">
<input type="file" name="fileUpload" multiple />
<br>
<br><br>
Select User
<select name="userDirectory">
<c:forEach items="${userslist}" var="user">
<option value=${user.userDirectory}>${user.userName}</option>
</c:forEach>
</select>
<input type="submit" value="Upload Files">
</form:form>
控制器代码
@PostMapping(value = "/createRequest")
public ModelAndView createRequest(@RequestParam("fileUpload") MultipartFile[] fileUpload,
@RequestParam("userDirectory") String userDirectory) throws IOException {
log.info("In createRequest method");
if (fileUpload != null && fileUpload.length > 0) {
Flow not coming here because fileUpload.length coming zero.
}
return new ModelAndView("success");
}
在控制器中,文件JSP页面中的fileUpload.length为零. 谢谢您的帮助.
In controller fileUpload.length is coming zero from JSP page. Any help will be appriciated, Thanks.
推荐答案
private void initMultipartResolver(ApplicationContext context)
{
try
{
this.multipartResolver = ((MultipartResolver)context.getBean("multipartResolver", MultipartResolver.class));
if (this.logger.isDebugEnabled()) {
this.logger.debug("Using MultipartResolver [" + this.multipartResolver + "]");
}
}
catch (NoSuchBeanDefinitionException ex)
{
this.multipartResolver = null;
if (this.logger.isDebugEnabled())
this.logger.debug("Unable to locate MultipartResolver with name 'multipartResolver': no multipart request handling provided");
}
}
使用此配置添加此配置后,任何enctype为multipart/form-data的请求都将在传递给Controller类之前由multipartResolver处理.
Add this configuration, with this configuration , any request with enctype as multipart/form-data will be handled by multipartResolver before passing on to the Controller class.
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