vue+java实现导出

Vue结合后台实现导出功能

转载：https://blog.csdn.net/liujun03/article/details/84378942

/**
     * 批量导出用户
     * @param condition
     * @param response
     */
@PostMapping("/exportUser")
public void exportUser(@RequestBody UserQueryCondition condition,HttpServletResponse response){
    XSSFWorkbook book = new XSSFWorkbook();
    try {
        List<UserParam> list = indexService.exportUser(condition);
        if (list != null && list.size() > 0) {
            XSSFSheet sheet = book.createSheet("mySheent");
            String[] vals = {"用户ID", "邮箱账号","昵称","年龄","性别","状态", "注册时间"};
            createExcel(sheet, 0, vals);
            for (int i = 0; i < list.size(); i++) {
                UserParam entity = list.get(i);
                String[] vals2 = new String[]{String.valueOf(entity.getId()), entity.getEmail(), entity.getName(), String.valueOf(entity.getAge()),
                                              entity.getSex() == 0 ? "女":"男",entity.getRemoved() == 0 ? "启用":"禁用",entity.getRegisterDate()};
                createExcel(sheet, i + 1, vals2);
            }

            book.write(generateResponseExcel("用户列表",response));
        }
        book.close();
    }catch(Exception e){
        e.printStackTrace();
    }
}

/**
     * @param excelName
     *            要生成的文件名字
     * @return
     * @throws IOException
     */
private ServletOutputStream generateResponseExcel(String excelName, HttpServletResponse response) throws IOException {
    excelName = excelName == null || "".equals(excelName) ? "excel" : URLEncoder.encode(excelName, "UTF-8");
    response.setContentType("application/vnd.ms-excel;charset=utf-8");
    response.setHeader("Content-Disposition", "attachment; filename=" + excelName + ".xlsx");

    return response.getOutputStream();
}

对于第一个函数exportUser来说，主要是根据传回来的条件查询数据库并生成相应的Excel表格，之后book.write(generateResponseExcel(“用户列表”,response)); 这行代码调用第二个函数generateResponseExcel来生成流文件以及处理返回的Response。

这里需要注意的地方就两个：

response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment; filename=" + excelName + ".xlsx");

第一行application/vnd.ms-excel说明将结果导出为Excel

第二行说明提供那个打开/保存对话框，将文件作为附件下载

上面就是后台的全部代码了，接下来看一下前端的代码：

axios({
        method: 'post',
        url: 'http://localhost:19090/exportUser',
        data: {
          email: this.email,
          userIdArray: this.userIdArray,
          startRegisterDate: this.registerStartTime,
          endRegisterDate: this.registerEndTime
        },
        responseType: 'blob'
      }).then((res) => {
        console.log(res)
        const link = document.createElement('a')
        let blob = new Blob([res.data],{type: 'application/vnd.ms-excel'});
        link.style.display = 'none'
        link.href = URL.createObjectURL(blob);
        let num = ''
        for(let i=0;i < 10;i++){
          num += Math.ceil(Math.random() * 10)
        }
        link.setAttribute('download', '用户_' + num + '.xlsx')
        document.body.appendChild(link)
        link.click()
        document.body.removeChild(link)
      }).catch(error => {
        this.$Notice.error({
          title: '错误',
          desc: '网络连接错误'
        })
        console.log(error)
      })

这里为了方便做记录，我是直接在页面中使用axios发送了个post请求。

仔细看axios请求加了个responseType: 'blob'配置，这是很重要的