package com.mouday.demo.controller; import org.springframework.stereotype.Controller; import org.springframework.util.ResourceUtils; 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.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.List; /** * 文件上传 * 参考 * https://blog.csdn.net/gnail_oug/article/details/80324120 */ @Controller public class FileController { // 获取上传测试页面 @GetMapping("/upload") public String upload() { return "upload"; } // 单文件上传 @PostMapping("/upload") @ResponseBody public String upload(MultipartFile file) { if (file.isEmpty()) { return "file is Empty"; } String filename = file.getOriginalFilename(); try { File path = this.getUploadDirectory(); File dest = new File(path, filename); System.out.println(dest.getPath()); file.transferTo(dest); return new File("/upload", filename).toString(); } catch (IOException e) { e.printStackTrace(); return "error"; } } // 多文件上传 @PostMapping("/multiUpload") @ResponseBody public List<String> upload(@RequestParam("file") List<MultipartFile> files) { List<String> list = new ArrayList<>(); for (MultipartFile file : files) { list.add(this.upload(file)); } return list; } /** * 获取文件保存路径 * 参考：https://www.bbsmax.com/A/GBJrE67Wz0/ * * @return * @throws FileNotFoundException */ public File getUploadDirectory() throws FileNotFoundException { String pathName = ResourceUtils.getURL("classpath:").getPath(); File path = new File(pathName, "/public/upload"); if (!path.exists()) { path.mkdirs(); } return path; } }
前端代码
src/main/resources/templates/upload.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h2>单文件上传</h2> <form action="/upload" method="post" enctype="multipart/form-data"> <input type="file" name="file"> <input type="submit" value="提交"> </form> <h2>多文件上传</h2> <form action="/multiUpload" method="post" enctype="multipart/form-data"> <input type="file" name="file"> <input type="file" name="file"> <input type="file" name="file"> <input type="submit" value="提交"> </form> </body> </html>
因为前端页面需要使用模板引擎，所以需要引入依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>
application.properties 配置上传的文件大小限制
# 上传文件总的最大值 spring.servlet.multipart.max-request-size=10MB # 单个文件的最大值 spring.servlet.multipart.max-file-size=10MB
参考
