java 实现上传功能

上传功能 使用的是Element UI  提供的  Upload插件

前端：

<template>
  <div>
    <!-- 上传文件 -->
    <el-card style="height:400px;overflow-y:auto;">
        <div style="width:250px;"> 
            <el-upload
                class="upload-demo"
                :action="uploadUrl"
                :before-upload='checkFileType'
                :limit="1"
                :data="uploadParamData"  
                :on-remove="handleRemove"
                ref="test"
                :auto-upload="false"
                :on-success="afterSuccess"
            >
                <el-button size="small" type="primary">选择文件</el-button>
            </el-upload>
            <div slot="tip" class="el-upload__tip" style="margin-top:10px">只能上传<b class="fonta_"> .xlsx </b> 和<b class="fonta_"> .xls </b>文件</div>
            <el-button size="small" type="primary" plain @click="submint" style="margin-top:30px">确认上传</el-button>
        </div>
    </el-card>
  </div>
</template>

<script>
export default {
  data() {
    return {
        userInfo: this.$store.state.userBean, //{"userId":"","username":"","deptId":"","dept":""}

        /******************************** 上传文件相关 ********************************/
        uploadUrl:'',       //上传路径
        uploadParamData:{   //上传参数
            userId:this.$store.state.userBean.userId,
            userName:this.$store.state.userBean.username,
            UploadFile:'',
        },
    };
  }, 
  methods: {
    submint(){
        this.$refs.test.submit();// Element UI 提供的提交 方法
    },
    //上传成功后执行
    afterSuccess(response, file, fileList){
        console.log('上传结果返回的值=',response)
         this.$message.warning(response.returnData);
         this.$refs.test.clearFiles();//清空上传列表

    },
    handleRemove(file) {
        return true;    //直接删除
    },
    //检查文件类型
    checkFileType(file){
        let fileType = file.name.substr(file.name.lastIndexOf('.'),file.name.length-1)
        if(fileType!='.xlsx' && fileType!='.xls'){
            this.$message.warning(`${file.name}  不符合上传文件类型`);
            return false;
        }
        this.uploadParamData.UploadFile = file.name;
    },
},
  created(){
    this.uploadUrl = `${fss}/dcb/upload`;
  }
};
</script>

后端：

/**
     * 导入 --->资产信息
     * @param request
     * @return
     * @throws IOException
     * @throws DbException
     */
    @RequestMapping(value = "/upload",method = RequestMethod.POST)
    @ResponseBody
    public AjaxJsonResult uploadFile(HttpServletRequest request,@RequestParam("file") MultipartFile file){
        AjaxJsonResult ajr = new AjaxJsonResult();
        ajr.setOperSuc("上传失败");
        try {
            String fileName = file.getOriginalFilename();   /*获取文件名*/
            String suffixName = fileName.substring(fileName.lastIndexOf(".")); /*获取文件的后缀名*/
            System.out.println("获取文件名 ="+fileName);
            System.out.println("获取文件的后缀名 ="+suffixName);
            String filePath = "C:\\Users\\fan\\Desktop\\图片\\";             /*保存 文件路径*/
            File newFile = new File(filePath + fileName);

            if (!newFile.getParentFile().exists()) {   /*检测是否存在目录*/
                newFile.getParentFile().mkdirs();
            }
            file.transferTo(newFile);
            ajr.setOperSuc("上传成功");
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            return ajr;
        }
    }

注：

        @RequestParam("file") MultipartFile file  注解中接收的参数名为 file 和前端传到的值的名字无关 (虽然目前也不知道为啥)