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Vue下载文件之文件流

{% note success %} 后端返回文件流，vue下载到本地 请求时需要设置 responseType: "blob",否则下载pdf文件打开会为空

操作

必须 responseType: "blob"，不然下载的pdf为空白

// getDownFile
export function getDownFile (url, parameter) {
  return axios({
    url: url,
    method: "get",
    params: parameter,
    // 下载pdf空白问题
    responseType: "blob"
  });
}

Vue 组件中使用

handleExportXls(fileName) {
  if (!fileName || typeof fileName !== "string") {
    fileName = "导出文件";
  }
  getDownFile("后端地址", 需要传的参数).then((data) => {
    if (!data) {
      this.$message.warning("文件下载失败");
      return;
    }
    if (typeof window.navigator.msSaveBlob !== "undefined") {
      window.navigator.msSaveBlob(new Blob([data]), fileName + ".xlsx");
    } else {
      const url = window.URL.createObjectURL(new Blob([data]));
      const link = document.createElement("a");
      link.style.display = "none";
      link.href = url;
      link.setAttribute("download", fileName + ".xlsx");
      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link); // 下载完成移除元素
      window.URL.revokeObjectURL(url); // 释放掉blob对象
    }
  });
}

其他写法参考

https://www.jianshu.com/p/f7e3477d7182

const filename = response.headers['content-disposition'].match(
      /filename=(.*)/
)[1]
// 首先要创建一个 Blob 对象（表示不可变、原始数据的类文件对象）
const blob = new Blob([response.data], {type: 'application/zip'});
// or const blob = new File([response.data], fileName);

if (typeof window.navigator.msSaveBlob !== 'undefined') {
    // 兼容IE，window.navigator.msSaveBlob：以本地方式保存文件
    window.navigator.msSaveBlob(blob, decodeURI(filename))
} else {
    let elink = document.createElement("a"); // 创建一个<a>标签
    elink.style.display = "none"; // 隐藏标签
    elink.href = window.URL.createObjectURL(blob); // 配置href，指向本地文件的内存地址
    elink.download = filename;
    elink.click();
    URL.revokeObjectURL(elink.href); // 释放URL 对象
    document.body.removeChild(elink); // 移除<a>标签
}

https://blog.csdn.net/weixin_43928792/article/details/122881900

//url请求参数
//params请求参数
//filename文件名称
export function download(url, params, filename) {
  return service
    .post(url, params, {
      transformRequest: [
        // (params) => {
        //   return tansParams(params);
        // },
      ],
      headers: {
        "Content-Type": "application/json;charset=utf-8",
        //"Content-Type": "application/x-www-form-urlencoded",
      },
      responseType: "blob",//关键
    })
    .then((data) => {
      console.log(data);
      const content = data;
      const blob = new Blob([content]);
      if ("download" in document.createElement("a")) {
        const elink = document.createElement("a");
        elink.download = filename;
        elink.style.display = "none";
        elink.href = URL.createObjectURL(blob);
        document.body.appendChild(elink);
        elink.click();
        URL.revokeObjectURL(elink.href);
        document.body.removeChild(elink);
      } else {
        navigator.msSaveBlob(blob, filename);
      }
    })
    .catch((r) => {
      console.error(r);
    });
}

参考