springboot-上传文件

导入的依赖

 <!-- 添加web起步依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- Thymeleaf模板起步依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

yml配置文件的上传路径

spring:
   #上传文件路径
  upload-path: F:/file/upload/

前端

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>上传文件</title>
</head>
<body>

<h2 style="color: red">用于上传文件的表单，请求方式必须是 POST </h2>
<h2>上传单个文件</h2>
<form th:action="@{/upload/one}" method="post" enctype="multipart/form-data">
    <input th:type="file" name="file" value="请选择文件">
    <input th:type="submit" value="上传"/>
</form>

<h2>上传多个文件</h2>
<form th:action="@{/upload/more}" method="post" enctype="multipart/form-data">
    <input th:type="file" name="files" value="选择文件" multiple="multiple">
    <input th:type="submit" value="上传">
</form>


</body>
</html>

后端-controller

package com.demo.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@Controller
public class UploadFileController {

    @Value("${spring.upload-path}")
    private String targetDir;


    @GetMapping("/toUpload")
    public String toUpload() {
        return "upload";
    }


    /**
     * 上传单个文件
     * @param file
     * @return
     */
    @PostMapping("/upload/one")
    @ResponseBody
    public String uploadSigleFile(@RequestParam("file") MultipartFile file) {

        try {
            String originalFilename = file.getOriginalFilename();

            String ext = originalFilename.substring(originalFilename.lastIndexOf("."));

            String filename = UUID.randomUUID().toString().replace("-", "") + ext;

            file.transferTo(new File(targetDir+ filename));

        } catch (IOException e) {

            log.error(e.getMessage(), e);

            return "上传失败";

        }

        return "上传成功";

    }


    /**
     * 上传多个文件
     * @param files
     * @return
     */
    @PostMapping(path="/upload/more", consumes= MediaType.MULTIPART_FORM_DATA_VALUE)
    @ResponseBody
    public String uploadManyFile(@RequestPart("files") MultipartFile[] files) {

        try {
            for (MultipartFile file : files) {

                String originalFilename = file.getOriginalFilename();

                String ext = originalFilename.substring(originalFilename.lastIndexOf("."));

                log.debug("ext =" + ext);

                String filename = UUID.randomUUID().toString().replace("-", "") + ext;

                file.transferTo(new File(targetDir+ filename));

            }
        } catch (IOException e) {

            e.printStackTrace();

            return "上传失败";
        }

        return "上传成功";
    }
}