Spring Boot——文件上传和下载

Spring Boot提供了方便的方式来实现文件上传和下载功能。

1. 文件上传

创建一个Controller来处理文件上传请求：

import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

@RestController
public class FileUploadController {
   

    @PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) {
   
        try {
   
            File convertedFile = new File("path/to/save/" + file.getOriginalFilename());
            convertedFile.createNewFile();
            FileOutputStream fileOutputStream = new FileOutputStream(convertedFile);
            fileOutputStream.write(file.getBytes());
            fileOutputStream.close();
            return "上传成功";
        } catch (IOException e) {
   
            return "上传失败";
        }
    }
}

2. 文件下载

创建一个Controller来处理文件下载请求：

import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;

@RestController
public class FileDownloadController {
   

    @GetMapping("/download/{fileName:.+}")
    public ResponseEntity<Resource> downloadFile(@PathVariable String fileName) {
   
        Path filePath = Paths.get("path/to/save/" + fileName);
        Resource resource;
        try {
   
            resource = new UrlResource(filePath.toUri());
        } catch (IOException e) {
   
            throw new RuntimeException("File not found: " + fileName);
        }

        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
                .body(resource);
    }
}

在以上代码中，文件上传会将文件保存到指定路径，文件下载会根据文件名提供下载链接。

原文链接: https://blog.csdn.net/2401_82884096/article/details/138335076

Spring Boot——文件上传和下载

1. 文件上传

2. 文件下载

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