java – multipart form POST提交请求获取损坏的文件

2023年4月5日 224次阅读

我无法正确上传文件.

我的问题摘要：正在上传的任何文件(* .docx,* .pdf,* .jpg / png / bmp等)都在服务器端收到损坏.

我的环境：JSP Spring 3 MVC Java.

我尝试了不同的方法,包括由BalusC在here提出的方法,但失败了.

这些是失败严重失败的示例上传.

我的代码：
tempform.jsp

<form:form method="POST" acceptCharset="ISO-8859-15" action="submit.htm"
commandName="commandform" enctype="multipart/form-data" >
...
<input  name ="file0[] type="file" id="file0" multiple>
...
<input type="submit" name="submit">

controller.java

@RequestMapping(value = "/submit", method = RequestMethod.POST)
public ModelAndView submitRequest(@ModelAttribute("commandform") Request req, HttpServletRequest request, HttpServletResponse response, ModelMap model){
try {
 MultipartHttpServletRequest tempPart = (MultipartHttpServletRequest) httpReq;
         //file being transported is original.jpg and is only one.
         MultipartFile filePart = tempPart.getFile("file0[]");
         String fileName1 = filePart.getOriginalFilename();
         InputStream fileContent = filePart.getInputStream();

         //printing file here in this step for debugging purpose. Using jpg type only for example purpose.
         BufferedImage bImageFromConvert = ImageIO.read(fileContent);
         ImageIO.write(bImageFromConvert, "jpg", new File(
                "e:/mynewfile.jpg"));
         //file is created at location but with distorted version as shown in image.
         ...
}catch(Exception ex){
...
}
}

我怀疑：内容类型是否对此行为负责？我正在使用< init-param>强制使用CharacterEncodingFilter我的web.xml中的值为ISO-8859-15.我在jsp页面中也使用了ISO-8859-15编码,因为我还必须处理欧洲文本.
我们非常欢迎任何帮助或指导.提前致谢.

最佳答案 我认为问题不在于acceptCharset =“ISO-8859-15”

我根据Spring IO网站的入门指南：
Spring IO file upload example整理了一个测试用例(使用Spring boot
spring-boot)

我还为一个正在进行文件上传的项目编写了一个Spring 3 MVC控制器.它类似于我在下面显示的示例.

使用这个Spring启动测试用例,我可以使用UTF-8和ISO-8859-15上传您的示例图像.它工作正常.当然,我没有像你一样使用CharacterEncodingFilter.
这是我的一些代码,因此您可以与您的代码进行比较.

我希望它有所帮助.

Application.java：

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application extends SpringBootServletInitializer {

    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setMaxFileSize("128KB");
        factory.setMaxRequestSize("128KB");
        return factory.createMultipartConfig();
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

FileUploadController.java：

@Controller
public class FileUploadController {

    @RequestMapping("/")
    public String welcome() {
        return "welcome";
    }

    @RequestMapping(value="/upload", method=RequestMethod.GET)
    public @ResponseBody String provideUploadInfo() {
        return "You can upload a file by posting to this same URL.";
    }

    @RequestMapping(value="/upload", method=RequestMethod.POST)
    public @ResponseBody String handleFileUpload(@RequestParam("name") String name, 
            @RequestParam("file") MultipartFile file){
        if (!file.isEmpty()) {
            try {
                byte[] bytes = file.getBytes();
                BufferedOutputStream stream = 
                        new BufferedOutputStream(new FileOutputStream(new File(name)));
                stream.write(bytes);
                stream.close();
                return "You successfully uploaded " + name + " into " + name;
            } catch (Exception e) {
                return "You failed to upload " + name + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload " + name + " because the file was empty.";
        }
    }
}

welcome.jsp的片段：

<%-- 
<form:form action="upload" method="POST" acceptCharset="UTF-8" enctype="multipart/form-data"  >
--%>
<form:form action="upload" method="POST" acceptCharset="ISO-8859-15" enctype="multipart/form-data"  >
  <table>
      <tr>
        <td>  
            <!-- <input type="hidden" name="action" value="upload" />  -->
            <strong>Please select a file to upload :</strong> <input type="file" name="file" />
        </td>
      </tr>
      <tr>
        <td>Name: <input type="text" name="name"><br />
        </td>
      </tr>
      <tr>
        <td>
         <input type="submit" value="Upload"> Press here to upload the file!
        </td>
      </tr>
  </table>
</form:form>
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