SpringBoot+Vue.js实现前后端分离的文件上传功能

<dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter</artifactId>
  </dependency>
  <!--加入web模块-->
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.39</version>
  </dependency>
 </dependencies>

@RestController
@RequestMapping("/upload")
@CrossOrigin
public class UploadController {
 @Value("${prop.upload-folder}")
 private String UPLOAD_FOLDER;
 private Logger logger = LoggerFactory.getLogger(UploadController.class);
 @PostMapping("/singlefile")
 public Object singleFileUpload(MultipartFile file) {
  logger.debug("传入的文件参数：{}", JSON.toJSONString(file, true));
  if (Objects.isNull(file) || file.isEmpty()) {
   logger.error("文件为空");
   return "文件为空，请重新上传";
  }
  try {
   byte[] bytes = file.getBytes();
   Path path = Paths.get(UPLOAD_FOLDER + file.getOriginalFilename());
   //如果没有files文件夹，则创建
   if (!Files.isWritable(path)) {
    Files.createDirectories(Paths.get(UPLOAD_FOLDER));
   }
   //文件写入指定路径
   Files.write(path, bytes);
   logger.debug("文件写入成功...");
   return "文件上传成功";
  } catch (IOException e) {
   e.printStackTrace();
   return "后端异常...";
  }
 }
}

<template>
 <div class="hello">
 <h1>{{ msg }}</h1>
 <form>
  <input type="file" @change="getFile($event)">
  <button class="button button-primary button-pill button-small" @click="submit($event)">提交</button>
 </form>
 </div>
</template>
<script>
 import axios from 'axios';
 export default {
 name: 'HelloWorld',
 data() {
  return {
  msg: 'Welcome to Your Vue.js App',
  file: ''
  }
 },
 methods: {
  getFile: function (event) {
  this.file = event.target.files[0];
  console.log(this.file);
  },
  submit: function (event) {
  //阻止元素发生默认的行为
  event.preventDefault();
  let formData = new FormData();
  formData.append("file", this.file);
  axios.post('http://localhost:8082/upload/singlefile', formData)
   .then(function (response) {
   alert(response.data);
   console.log(response);
   window.location.reload();
   })
   .catch(function (error) {
   alert("上传失败");
   console.log(error);
   window.location.reload();
   });
  }
 }
 }
</script>

npm install
npm run dev