Angular 8 - 下载 Excel .xlsx 将 base64 字符串保存在文件中
Angular8 - Downloading Excel .xlsx saves base64 string in file
我研究了所有关于这个问题的 SO Similar Questions，其中一些有帮助，但没有直接解决将 xlsx 文件保存到本地 Win10 下载文件夹的问题。
xlsx 文件位于 CentOS 7 服务器上。如果我用Filezilla复制到Win10就可以了
查看下面的组件代码，我正在从服务器读取 xlsx 并获取其 base64Str，它与我用来存储文件的内容完全匹配。我很好地创建了一个 blob，但 FileSaver 将 Win10 文件及其内容保存为 base64Str，而不是 xlsx 二进制文件。 FileSaver 可以保存二进制内容，还是只能保存文本？
感谢您的帮助！
组件代码
//INPUT DATA: docName: test.xlsx; mediaType: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; snippet base64Str: VUVzREJCUU...FBQUFBPQ=
//NOTE: input data is from a CentOS 7 filesystem
const byteStr = atob(base64Str);
const arrayBuffer = new ArrayBuffer(byteStr.length);
const int8Array = new Uint8Array(arrayBuffer);
for (let i = 0; i < byteStr.length; i++) {
int8Array[i] = byteStr.charCodeAt(i);
}
const blob = new Blob([arrayBuffer], { type: mediaType }); //also tried type: 'application/octet-stream'
//alternate technique that produces same corrupted result
//const base64Response = await fetch(`data:` +mediaType +`;base64,${base64Str}`);
//const blob = await base64Response.blob();
fileSaver.saveAs(blob, docName); //saves to Win10 downloads folder
不确定这是否有效，但尝试像下面这样设置媒体类型：
const mediaType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8';
请尝试下面的代码。 （在此示例中，我演示了以下内容 1）将 base64 字符串输入到输入文本区域 2）单击下载文件 link 3）将提示将文件下载为正确的 xlsx 格式，而不会损坏数据）。
请根据您的需要修改代码。示例仅演示文件下载功能。
注意事项：
var mediaType="data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,";
function saveAsXlsxFile(){
var mediaType="data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,";
var userInp = document.getElementById('base64input');
// var userInp = "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var a = document.createElement('a');
a.href = mediaType+userInp.value;
//a.href = mediaType+userInp;
a.download = 'filename.xlsx';
a.textContent = 'Download file!';
document.body.appendChild(a);
}
<textarea placeholder="paste the base64 data here, exclude readable headers" id='base64input' type="textarea"></textarea>
<br>
<input onclick="saveAsXlsxFile()" type="button" value="update content of link"></button>
HTML 代码仅供演示（您的要求不是强制性的）
<textarea placeholder="paste the base64 data here, exclude readable headers" id='base64input'></textarea>
<br>
<input onclick="saveAsXlsxFile()" type="button" value="update content of link"></button>
Sample userInp value Try this :
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如果需要，很乐意进一步提供帮助。 :)
我研究了所有关于这个问题的 SO Similar Questions，其中一些有帮助，但没有直接解决将 xlsx 文件保存到本地 Win10 下载文件夹的问题。
xlsx 文件位于 CentOS 7 服务器上。如果我用Filezilla复制到Win10就可以了
查看下面的组件代码，我正在从服务器读取 xlsx 并获取其 base64Str，它与我用来存储文件的内容完全匹配。我很好地创建了一个 blob，但 FileSaver 将 Win10 文件及其内容保存为 base64Str，而不是 xlsx 二进制文件。 FileSaver 可以保存二进制内容，还是只能保存文本？
感谢您的帮助！
组件代码
//INPUT DATA: docName: test.xlsx; mediaType: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; snippet base64Str: VUVzREJCUU...FBQUFBPQ=
//NOTE: input data is from a CentOS 7 filesystem
const byteStr = atob(base64Str);
const arrayBuffer = new ArrayBuffer(byteStr.length);
const int8Array = new Uint8Array(arrayBuffer);
for (let i = 0; i < byteStr.length; i++) {
int8Array[i] = byteStr.charCodeAt(i);
}
const blob = new Blob([arrayBuffer], { type: mediaType }); //also tried type: 'application/octet-stream'
//alternate technique that produces same corrupted result
//const base64Response = await fetch(`data:` +mediaType +`;base64,${base64Str}`);
//const blob = await base64Response.blob();
fileSaver.saveAs(blob, docName); //saves to Win10 downloads folder
不确定这是否有效，但尝试像下面这样设置媒体类型：
const mediaType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8';
请尝试下面的代码。 （在此示例中，我演示了以下内容 1）将 base64 字符串输入到输入文本区域 2）单击下载文件 link 3）将提示将文件下载为正确的 xlsx 格式，而不会损坏数据）。
请根据您的需要修改代码。示例仅演示文件下载功能。
注意事项：
var mediaType="data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,";
function saveAsXlsxFile(){
var mediaType="data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,";
var userInp = document.getElementById('base64input');
// var userInp = "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var a = document.createElement('a');
a.href = mediaType+userInp.value;
//a.href = mediaType+userInp;
a.download = 'filename.xlsx';
a.textContent = 'Download file!';
document.body.appendChild(a);
}
<textarea placeholder="paste the base64 data here, exclude readable headers" id='base64input' type="textarea"></textarea>
<br>
<input onclick="saveAsXlsxFile()" type="button" value="update content of link"></button>
HTML 代码仅供演示（您的要求不是强制性的）
<textarea placeholder="paste the base64 data here, exclude readable headers" id='base64input'></textarea>
<br>
<input onclick="saveAsXlsxFile()" type="button" value="update content of link"></button>
Sample userInp value Try this :
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如果需要，很乐意进一步提供帮助。 :)