前端代码
elupload.vue文件

• 属性action是文件上传的地址，也就是平时我们调用的接口
• el-upload自带了一个submit方法是用来上传文件的
• 如果要自定义submit的话el-upload需要加上:http-request="submit"

<template>
  <el-form :model="form">
    <el-form-item label="上传文件" :label-width="formLabelWidth">
      <el-upload ref="uploadDemo" action="/api/elupload" :auto-upload="false" multiple :file-list="fileList">
        <el-button size="small" type="primary">选择文件</el-button>
      </el-upload>
    </el-form-item>
    <el-form-item>
      <el-button size="small" type="primary" @click="uploadFile">立即上传</el-button>
      <el-button size="small">取消</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      formLabelWidth: '80px',
      form: {
        file: ''
      },
      fileList: []
    }
  },
  methods: {
    uploadFile() {
      this.$refs.uploadDemo.submit()
    }
    // submit(params) { // 如果要自定义submit的话el-upload需要加上:http-request="submit"
    //   console.log(params)
    //   const form = new FormData()
    //   form.append('xml', params.file)
    //   this.$http.post('/elupload', form, {
    //     headers: {
    //       'Content-Type': 'multipart/form-data'
    //     }
    //   }).then(() => {
    //     this.$notify({
    //       title: '成功',
    //       message: '导入成功',
    //       type: 'success',
    //       duration: 2000
    //     })
    //   })
    // }
  }
}
</script>

vue.config.js文件用来代理跨域

• 这个demo的代理路径需要rewrite到根路径'/'

module.exports = {
  devServer: {
    proxy: {
      '/api': {
        target: 'http://localhost:7070',
        secure: false,
        changeOrigin: true,
        pathRewrite: {
          '^/api': '/'
        }
      }
    }
  }
}

后端代码

@RestController
@CrossOrigin
public class ElUpload {

    @Value("${filepath}")
    public String filePath;

    @RequestMapping("/elupload")
    public String elUpload(MultipartFile file){
        String fileName = file.getOriginalFilename();
        File dest = new File(filePath + fileName);
        try {
            file.transferTo(dest);
            return "上传成功";
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "上传失败！";
    }

}