SpringBoot上传文件到后端服务器
Posted zhangphil
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定义上传文件的服务:
import org.springframework.web.multipart.MultipartFile;
import java.nio.file.Path;
public interface StorageService
long save(MultipartFile file, String dst) throws Exception;
void deleteAll(Path path);
上传服务的接口实现:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.FileSystemUtils;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
@Service
public class FileSystemStorageService implements StorageService
@Autowired
public FileSystemStorageService()
@Override
public long save(MultipartFile file, String uploadFilePath) throws Exception
if (file.isEmpty())
throw new Exception("Failed to store empty file " + file.getOriginalFilename());
if (!Files.exists(Path.of(uploadFilePath)))
try
Files.createDirectory(Path.of(uploadFilePath));
catch (Exception e)
e.printStackTrace();
String filePath = uploadFilePath + file.getOriginalFilename();
File dest = new File(filePath);
long cnt = 0;
try
cnt = Files.copy(file.getInputStream(), dest.toPath());
catch (Exception e)
e.printStackTrace();
return cnt;
@Override
public void deleteAll(Path rootLocation)
FileSystemUtils.deleteRecursively(rootLocation.toFile());
上面是基础的上传服务,写好后,开始写spring boot的controller控制器:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.nio.file.Path;
@Controller
public class FileUploadController
private final StorageService storageService;
@Value("$file.upload.path")
private String uploadFilePath;
@Autowired
public FileUploadController(StorageService storageService)
this.storageService = storageService;
@GetMapping("/upload_page")
public String uploadPage()
//返回存放在resources/templates下面的my_file_upload.html文件。
return "my_file_upload.html";
//触发动作对应my_file_upload.html里面的form表单中的action
@PostMapping("/do_upload_action")
@ResponseBody
public String uploadFiles(@RequestPart MultipartFile file)
String fileName = file.getOriginalFilename();
System.out.println("开始上传文件 " + fileName);
long cnt = 0;
try
cnt = storageService.save(file, uploadFilePath);
catch (Exception e)
e.printStackTrace();
return "上传字节数 " + cnt;
@GetMapping("/delete_file")
@ResponseBody
public String deleteFile()
storageService.deleteAll(Path.of(uploadFilePath));
return "删除完成";
在FileUploadController里面用到了my_file_upload.html,my_file_upload.html需要放在resources/templates下面,my_file_upload.html代码内容:
<html>
<body>
<form method="post" action="/do_upload_action" enctype="multipart/form-data">
<input type="file" name="file"><br>
<hr>
<input type="submit" value="提交上传">
</form>
</body>
</html>
my_file_upload.html里面的action="/do_upload_action"对应于FileUploadController中的uploadFiles()函数。
最后,在application.properties里面定义默认的上传文件目录,这个路径是服务器的位置,即当浏览器(客户端)上传文件后,保存到application.properties定义的服务器上的这个文件目录下面。
file.upload.path=E:/web/
application类:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringUploadfileApplication
public static void main(String[] args)
SpringApplication.run(SpringUploadfileApplication.class, args);
至此完成。
下面测试,在浏览器输入地址 http://localhost:8080/upload_page
服务器返回(浏览器出现)my_file_upload.html内容。随后选择一个文件,提交上传,浏览器页面跳转到 http://localhost:8080/do_upload_action
上传成功后,服务器返回上传文件的总字节数。
若直接在浏览器访问 http://localhost:8080/delete_file
就会删除定义的服务器端文件存储目录所有内容。
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