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上传文件,我尝试将的.csv文件的数据上传到数据库,但是当我上传并提交它,它抛出nullpointexception。意思是,当我打印名称在控制器中,名称被打印,但是当我尝试获取该文件时,它显示null。NullPointException而在春季
文件上传模型类
public class FileUpload {
private CommonsMultipartFile[] files;
private String name;
// Getters and setters
}
控制器
@RequestMapping(value = "uploadPage", method = RequestMethod.GET)
public ModelAndView uploadPage() {
ModelAndView model = new ModelAndView("upload_page");
FileUpload formUpload = new FileUpload();
model.addObject("formUpload", formUpload);
return model;
}
@RequestMapping(value = "/doUpload", method = RequestMethod.POST)
public String doUpload(@ModelAttribute("formUpload") FileUpload fileUpload, BindingResult result) throws IOException, JAXBException {
System.out.println("myfirl "+fileUpload.getFiles()); // output is null
System.out.println("name "+fileUpload.getName()); // name is displaying
//other stuffs
}
upload_page
<spring:url value="/doUpload" var="doUploadURL"/>
<form:form method="post" modelAttribute="formUpload" action="${doUploadURL }" enctype="multipart/form-data">
<form:input path="files" type="file" multiple="multiple"/>
<form:input path="name" type="text"/>
<button type="submit">Upload</button>
</form:form>
WebConfig
@Bean(name="multipartResolver")
public CommonsMultipartResolver getResolver(){
CommonsMultipartResolver commonsMultipartResolver=new CommonsMultipartResolver();
commonsMultipartResolver.setMaxUploadSizePerFile(20*1024*1024);
return commonsMultipartResolver;
}
我想它在许多方面理清,但未能成功。任何人都试图把它整理出来?在此先感谢
使用接口'MultipartFile'而不是具体类型'CommonsMultipartFile'模型中的对象。此外,你应该使用一个列表,而不是一个数组(如果内存为我服务)。 –
它仍然显示为空,我的问题是,控制器没有得到文件@deinum – varman