MultipartFile上传图片

以下是一个使用Spring Boot实现MultipartFile上传图片的例子：

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.springframework.stereotype.Controller;import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class ImageUploadController {

    private static String UPLOAD_FOLDER = "/path/to/upload/folder/";

    @GetMapping("/")
    public String index() {
        return "upload";
    }

    @PostMapping("/upload")
    public String singleFileUpload(@RequestParam("file") MultipartFile file, Model model) {
        if (file.isEmpty()) {
            model.addAttribute("message", "Please select a file to upload.");            return "uploadStatus";
        }

        try {
            byte[] bytes = file.getBytes();
            Path path = Paths.get(UPLOAD_FOLDER + file.getOriginalFilename());
            Files.write(path, bytes);

            model.addAttribute("message", "You successfully uploaded '" + file.getOriginalFilename() + "'");
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "uploadStatus";
    }
}

在上面的例子中，我们首先定义了一个上传文件的文件夹路径`UPLOAD_FOLDER`，然后在`singleFileUpload`方法中，我们使用`@RequestParam`注解来获取上传的文件，然后将文件保存到指定的文件夹中。