Spring boot 处理大文件上传完整代码

import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.StreamUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@Controller
@RequestMapping("/upload")
public class FileUploadController {
    @Value("${upload.directory}")
    private String uploadDirectory;
    @PostMapping
    public ResponseEntity<String> uploadFile(@RequestPart("file") MultipartFile file) {
        try (InputStream inputStream = file.getInputStream()) {
            // 获取上传文件的原始文件名
            String fileName = file.getOriginalFilename();
            // 生成保存文件的路径
            String filePath = uploadDirectory + File.separator + fileName;
            // 创建保存文件的目录（如果不存在）
            File directory = new File(uploadDirectory);
            if (!directory.exists()) {
                directory.mkdirs();
            }
            // 保存文件到指定路径
            try (OutputStream outputStream = new FileOutputStream(filePath)) {
                StreamUtils.copy(inputStream, outputStream);
            }
            // 文件保存成功
            return ResponseEntity.status(HttpStatus.OK).body("File uploaded successfully!");
        } catch (IOException e) {
            e.printStackTrace();
            // 文件保存失败
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("File upload failed!");
        }
    }
}