Springboot项目使用java写图片上传的功能代码

以下是一个使用Spring Boot实现图片上传的示例代码：

创建一个上传图片的控制器类

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;

@RestController
@RequestMapping("/api")
public class FileUploadController {

    private static final String UPLOAD_DIR = "uploads";

    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
        String fileName = StringUtils.cleanPath(file.getOriginalFilename());
        String uploadDir = request.getServletContext().getRealPath("") + UPLOAD_DIR;
        try {
            FileUploadUtil.saveFile(uploadDir, fileName, file);
        } catch (IOException e) {
            return new ResponseEntity<>("Could not upload the file: " + fileName, HttpStatus.BAD_REQUEST);
        }
        return new ResponseEntity<>("File uploaded successfully: " + fileName, HttpStatus.OK);
    }
}

创建一个文件上传工具类

import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class FileUploadUtil {

    public static void saveFile(String uploadDir, String fileName, MultipartFile multipartFile) throws IOException {
        Path uploadPath = Paths.get(uploadDir);
        if (!Files.exists(uploadPath)) {
            Files.createDirectories(uploadPath);
        }
        try {
            multipartFile.transferTo(new File(uploadDir + "/" + fileName));
        } catch (IOException e) {
            throw new IOException("Could not save file: " + fileName, e);
        }
    }
}

在application.properties文件中配置文件上传的最大大小

spring.servlet.multipart.max-file-size=10MB

这样，你就可以在Spring Boot应用程序中使用Java编写图片上传功能了