如何使用Spring mvc将图像上传到webapp/resources/images目录

Question

>我有存储库类，我想在其中将来自 MultipartFile 的图像存储到 webapp/resources/images 目录，然后再将产品详细信息添加到存储库？

@Override
public void addProduct(Product product) {
    Resource resource = resourceLoader.getResource("file:webapp/resources/images");
     MultipartFile proudctImage = product.getProudctImage();
     try {
        proudctImage.transferTo(new File(resource.getFile()+proudctImage.getOriginalFilename()));
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
    listOfProducts.add(product);
}

我的存储库类是 ResourceLoaderAware。我正在收到fileNotFoundException，"imagesDesert.jpg"是我尝试上传的图像

java.io.FileNotFoundException: webappresourcesimagesDesert.jpg (The system cannot find the path specified)

Answer 1

这个控制器（礼貌：https://askgif.com/）对我来说工作正常。

来源： https://askgif.com/blog/126/how-can-i-upload-image-using-spring-mvc-java/

试试这个

package net.viralpatel.spring3.controller;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import net.viralpatel.spring3.form.FileUploadForm;
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.multipart.MultipartFile;

@Controller
 public class FileUploadController {
//private String saveDirectory = "D:/Test/Upload/"; //Here I Added
private String saveDirectory = null; //Here I Added
@RequestMapping(value = "/show", method = RequestMethod.GET)
public String displayForm() {
    return "file_upload_form";
}
@SuppressWarnings("null")
@RequestMapping(value = "/save", method = RequestMethod.POST)
public String save(
        @ModelAttribute("uploadForm") FileUploadForm uploadForm,
                Model map,HttpServletRequest request) throws IllegalStateException, IOException{
    List<MultipartFile> files = uploadForm.getFiles();
    List<String> fileUrl = new ArrayList<String>();;
    String fileName2 = null;
    fileName2 = request.getSession().getServletContext().getRealPath("/");

    saveDirectory = fileName2+"images\";
    List<String> fileNames = new ArrayList<String>();
    //System.out.println("user directory : "+System.getProperty("user.dir"));
    System.out.println("applied directory : " + saveDirectory);
    if(null != files && files.size() > 0) {
        for (MultipartFile multipartFile : files) {
            String fileName = multipartFile.getOriginalFilename();
            System.out.println("applied directory : " + saveDirectory+fileName);
            if(!"".equalsIgnoreCase(fileName)){
                   //Handle file content - multipartFile.getInputStream()
                   fileUrl.add(new String(saveDirectory + fileName));
                   multipartFile.transferTo(new File(saveDirectory + fileName));   //Here I Added
                   fileNames.add(fileName);
                   }
            //fileNames.add(fileName);
            //Handle file content - multipartFile.getInputStream()
            //multipartFile.transferTo(new File(saveDirectory + multipartFile.getOriginalFilename()));   //Here I Added
        }
    }
    map.addAttribute("files", fileNames);
    map.addAttribute("imageurl",fileUrl);
    return "file_upload_success";
}
  }

Answer 2

最后我可以解决这个问题，我们不需要指定 file： 前缀，而且默认情况下resourceLoader.getResource()会在我们 Web 应用程序的根目录中查找资源，因此无需指定webapp文件夹名称。所以最后下面的代码对我有用

@Override
public void addProduct(Product product) {
    MultipartFile proudctImage = product.getProudctImage();
    if (!proudctImage.isEmpty()) {
        try {
            proudctImage.transferTo(resourceLoader.getResource("resources/images/"+product.getProductId()+".png").getFile());
        } catch (Exception e) {
            throw new RuntimeException("Product Image saving failed", e);
        }
    }
    listOfProducts.add(product);
}