Question

我尝试使用spring mvc 4，spring boot和thymeleaf作为模板引擎上传多个文件，但我无法访问上传的文件，这些文件作为一个多部分文件处理内容类型application / octet-stream。这是我的前端代码：

    <form name="offer-form" th:action="@{/submit-property}" method="POST" enctype="multipart/form-data">

    <!--   .. other inputs .. -->

         <div class="col-xs-12 margin-top-60">
            <input id="file-upload"name="files[]" type="file" multiple="multiple"/>
        </div>
         <div class="col-xs-12">
            <div class="center-button-cont margin-top-60">
                <button type="submit" class="button-primary button-shadow">
                    <span>submit property</span>
                    <div class="button-triangle"></div>
                    <div class="button-triangle2"></div>
                    <div class="button-icon"><i class="fa fa-lg fa-home"></i></div>
                </button>
            </div>
        </div>
    </form>

控制器代码：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.aq.domain.Property;
import com.aq.service.AddPropertyFormDataInitializerService;

@Controller
public class PorpertySubmissionController 
{
    public static final Resource PICTURES_DIR = new FileSystemResource("./uploadedPictures");

    //some unrelated code

    @RequestMapping(value="/submit-property", method=RequestMethod.GET)
    public String getSubmitPropertyForm(Model model)
    {
        model.addAttribute("property", new Property());

        return "submit-property";
    }

    @RequestMapping(value="/submit-property", method=RequestMethod.POST)
    public String submitProperty
    (
            @ModelAttribute(value="property") Property property,
            @RequestParam("files[]") MultipartFile[] uploadedImages
    )
    {
        //some unrelated code

        if(uploadedImages != null && uploadedImages.length > 0)
            {
                System.out.println("uploadedImages length: " + uploadedImages.length);
                for(MultipartFile imageFile : uploadedImages)
                {
                    try 
                    {
                        copyFileToPictures(imageFile);
                        System.out.println("copied File: " + imageFile.getOriginalFilename() + " successfully.");
                    } 
                    catch (IOException e) 
                    {
                        System.err.println(e.getMessage());
                        e.printStackTrace();
                    }
                }
            }
            else
            {
                System.out.println("no images were uploaded");
            }

        return "redirect:/submit-property";
    }

    private Resource copyFileToPictures(MultipartFile file) throws IOException {
        System.out.println("File Original Name: " + file.getOriginalFilename());
        System.out.println("File Name: " + file.getName());
        System.out.println("File size: " + file.getSize());
        System.out.println("File Content type: " + file.getContentType());

        String fileExtension = getFileExtension(file.getOriginalFilename());

        File tempFile = File.createTempFile("pic", fileExtension, PICTURES_DIR.getFile());
        try (InputStream in = file.getInputStream();
                OutputStream out = new FileOutputStream(tempFile)) {
            IOUtils.copy(in, out);
        }
        return new FileSystemResource(tempFile);
    }

    private static String getFileExtension(String name) {
        return name.substring(name.lastIndexOf("."));
    }
}

sysout的输出：

uploadedImages长度：1（即使我上传了多个文件）

文件原始名称（使用getOriginalFileName）：

文件名（使用getName）：files []

文件大小：0

文件内容类型：application / octet-stream

然后在空原始文件名上调用subsctring时出现异常。

我尝试将公共文件上传添加到我的POM并配置了CommonsMultipartResolver bean，但是它总是打印出没有上传的图像（这意味着它的空值或长度= 0）

Answer 1

如果有人面临同样的问题，事实证明它与春天和百里香无关。这只是因为我正在使用的主题使用bootstrap fileinput插件，它以两种模式工作：ajax和表单提交。事实证明，主题在文件上传中使用的大多数功能在表单提交模式下都不可用。所以这是第三方的lib问题，但我想我应该分享。

使用spring mvc 4和spring boot

1 个答案: