SpringBoot2+Vue2实战(五)导入导出实现

hutool工具

https://www.hutool.cn/docs/#/poi/Excel%E5%B7%A5%E5%85%B7-ExcelUtil

引入依赖

 <!--hutool-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.20</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>

导入功能

UserController

//导入
    @PostMapping("/import")
    public Boolean imp(MultipartFile file) throws Exception{
        InputStream inputStream = file.getInputStream();
        ExcelReader reader = ExcelUtil.getReader(inputStream);
        //方式1(推荐) 通过javabean的方式读取Excel内的对象 但是要求表头必须是英文，跟javabean的属性要对应起来
        /*List<User> list = reader.readAll(User.class);*/
        //方式二:忽略表头的中文 直接读取表内容
        List<List<Object>> list = reader.read(1);
        List<User> users = CollUtil.newArrayList();
        for (List<Object> row:list){
            User user = new User();
            user.setUsername(row.get(0).toString());
            user.setPassword(row.get(1).toString());
            user.setNickname(row.get(2).toString());
            user.setEmail(row.get(3).toString());
            user.setPhone(row.get(4).toString());
            user.setAddress(row.get(5).toString());
            user.setAvatarUrl(row.get(6).toString());
            users.add(user);
        }
        userService.saveBatch(users);
        return true;
    }

<el-upload action="http://localhost:9090/user/import" :show-file-list="false" accept="xlsx"
                 :on-success="handleExcelImportSuccess" style="display: inline-block">
        <el-button type="primary" class="ml-5">导入 <i class="el-icon-bottom"></i></el-button>
      </el-upload>


//导入
    handleExcelImportSuccess() {
      this.$message.success("导入成功")
      this.load()
    },

导出功能

 //导出
    @GetMapping("/export")
    public void export(HttpServletResponse response) throws Exception{
        //从数据库查询出所有数据
        List<User> list = userService.list();
        //通过工具类创建writer写出到磁盘路径
        /*ExcelWriter writer = ExcelUtil.getWriter(filesUploadPath+"/用户信息.xlsx");*/
        //在内存操作，写出到浏览器
        ExcelWriter  writer = ExcelUtil.getWriter(true);
        //自定义标签别名
        writer.addHeaderAlias("username", "用户名");
        writer.addHeaderAlias("password", "密码");
        writer.addHeaderAlias("nickname", "昵称");
        writer.addHeaderAlias("email", "邮箱");
        writer.addHeaderAlias("phone", "电话");
        writer.addHeaderAlias("address", "地址");
        writer.addHeaderAlias("createTime", "创建时间");
        writer.addHeaderAlias("avatarUrl", "头像");

        //一次性写出list内的对象到excel。使用默认样式，强制输出标题
        writer.write(list,true);

        //响应浏览器响应的格式
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        String fileName = URLEncoder.encode("用户信息","UTF-8");
        response.setHeader("Content-Disposition","attachment;filename="+fileName+"xlsx");

        ServletOutputStream out = response.getOutputStream();
        writer.flush(out,true);
        out.close();
        writer.close();

    }

<el-button type="primary" @click="exp" class="ml-5">导出 <i class="el-icon-top"></i></el-button>




//导出
    exp() {
      window.open("http://localhost:9090/user/export")
    },