Spring 3.0 MultipartFile上传 [英] Spring 3.0 MultipartFile upload

问题描述

我正在将Java Web应用程序转换为Spring框架，并感谢有关文件上传所面临问题的一​​些建议.原始代码是使用org.apache.commons.fileupload编写的.

I am converting Java web application to Spring framework and appreciate some advice on the issues I am facing with the file upload. Original code was written using org.apache.commons.fileupload.

1. Spring MultipartFile是否包装org.apache.commons.fileupload，还是可以从我的POM文件中排除这种依赖关系?

1. Does Spring MultipartFile wraps org.apache.commons.fileupload or I can exclude this dependency from my POM file?

我看过以下示例:

@RequestMapping(value = "/form", method = RequestMethod.POST)
public String handleFormUpload(@RequestParam("file") MultipartFile file) {

    if (!file.isEmpty()) {
        byte[] bytes = file.getBytes();
        // store the bytes somewhere
       return "redirect:uploadSuccess";
    } else {
        return "redirect:uploadFailure";
    }
}

最初，我尝试按照此示例进行操作，但是由于找不到此请求参数，总是出现错误.因此，在我的控制器中，我执行了以下操作:

Originally I tried to follow this example but was always getting an error as it couldn't find this request param. So, in my controller I have done the following:

@RequestMapping(value = "/upload", method = RequestMethod.POST)
public @ResponseBody
ExtResponse upload(HttpServletRequest request, HttpServletResponse response)
{
   // Create a JSON response object.
   ExtResponse extResponse = new ExtResponse();
   try {
       if (request instanceof MultipartHttpServletRequest)
       {
           MultipartHttpServletRequest multipartRequest =
                        (MultipartHttpServletRequest) request;
           MultipartFile file = multipartRequest.getFiles("file");
           InputStream input = file.getInputStream();
           // do the input processing
           extResponse.setSuccess(true);
        }
    } catch (Exception e) {
        extResponse.setSuccess(false);
        extResponse.setMessage(e.getMessage());
    }
    return extResponse;
}

，它正在工作.如果有人可以告诉我为什么@RequestParam对我不起作用，我将不胜感激.顺便说一句，我确实有

and it is working. If someone can tell me why @RequestParam did not work for me, I will appreciate. BTW I do have

    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="2097152"/>
    </bean>

在我的servlet上下文文件中.

in my servlet context file.

推荐答案

我必须

1. 将commons-fileupload依赖项添加到我的pom中，
2. 添加multipartResolver bean(在问题中提到)，
3. 在handleFormUpload方法中使用@RequestParam("file")MultipartFile文件，并且
4. 在我的jsp中添加enctype:<form:form method="POST" action="/form" enctype="multipart/form-data" >

1. add commons-fileupload dependency to my pom,
2. add multipartResolver bean (mentioned in the question),
3. use @RequestParam("file") MultipartFile file in the handleFormUpload method and
4. add enctype in my jsp : <form:form method="POST" action="/form" enctype="multipart/form-data" >

使其正常工作.

这篇关于Spring 3.0 MultipartFile上传的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！