所以我有一个Node.js脚本和一个 Javascript 文件相互通信，除了Node.js应该返回.mp3文件数据外，一切正常。
数据是二进制的，看起来像乱码，我将如何获取它返回的数据并允许用户使用 Javascript 在网页上下载它？
它顺便获取数据http.responseText。
Node.js 代码
//initilization
var querystring = require('querystring');
var http = require('http');
var url = require('url');
var fileSystem = require('fs');
var path = require('path');
var util = require('util');
//convert function
function convert(voiceToUse, textToConvert, response)
{
console.log("Sending Convert Request...");
//data to send as a query
var data = querystring.stringify(
{
username: 'user',
password: 'pass',
action: 'convert',
voice: voiceToUse,
text: textToConvert
});
//options to use
var options = {
host: 'ws.ispeech.org',
port: 80,
path: '/api/rest/1.5',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': data.length
}
};
//http post request
var req = http.request(options, function (res)
{
res.setEncoding('utf8');
res.on('data', function (chunk)
{
console.log("Body: " + chunk);
var fileId = chunk.substr(chunk.indexOf("fileid") + 7);
console.log("Converting File...");
download(fileId.substr(0, fileId.search("&")), response);
});
});
req.on('error', function (e)
{
console.log('problem with request: ' + e.message);
});
req.write(data);
req.end();
}
//download function
function download(id, response)
{
//data to send as a query
var data = querystring.stringify(
{
username: 'user',
password: 'pass',
action: 'download',
fileid: id
});
//options to use
var options = {
host: 'ws.ispeech.org',
port: 80,
path: '/api/rest/1.5',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': data.length
}
};
//http post request
var req = http.request(options, function (res)
{
res.on('data', function (chunk)
{
if (JSON.stringify(res.headers).indexOf("audio/mp3") != -1)
{
console.log("Downloading Chunk...");
/*var fs = require('fs'),
str = 'string to append to file';
fs.open('test.mp3', 'a', 666, function (e, id)
{
fs.write(id, chunk, 0, chunk.length, 0, function ()
{
fs.close(id, function ()
{
});
});
});*/
response.write(chunk, "binary");
}
else
{
download(id, response);
}
});
res.on('end', function ()
{
if (JSON.stringify(res.headers).indexOf("audio/mp3") != -1){
response.end();
}
});
});
req.on('error', function (e)
{
console.log('problem with request: ' + e.message);
});
req.write(data);
req.end();
}
http = require('http');
fs = require('fs');
server = http.createServer( function(req, res) {
console.dir(req.param);
if (req.method == 'POST') {
console.log("POST");
var body = '';
req.on('data', function (data) {
body += data;
console.log("Partial body: " + body);
});
req.on('end', function () {
console.log("Body: " + body);
if(body){
convert('engfemale1', body, res);
res.writeHead(200, {
'Content-Type': 'audio/mp3',
'Content-Disposition': 'attachment; filename="tts.mp3"'
});
}
});
}
});
port = 8080;
server.listen(port);
console.log('Listening at port ' + port);
Javascript代码
console.log('begin');
var http = new XMLHttpRequest();
var params = "text=" + bodyText;
http.open("POST", "http://supersecretserver:8080", true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//http.setRequestHeader("Content-length", params.length);
//http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {
console.log('onreadystatechange');
if (http.readyState == 4 && http.status == 200) {
alert(http.responseText);//response text is binary mp3 data
}
else {
console.log('readyState=' + http.readyState + ', status: ' + http.status);
}
}
console.log('sending...')
http.send(params);
console.log('end');