目前有很多提供语音合成的SDK，比如科大讯飞，百度，腾讯云等。
其实windows powershell里自带语音合成。
例如：
Add-Type -AssemblyName System.speech;
$speak = New-Object System.Speech.Synthesis.SpeechSynthesizer;
$speak.Rate =1;//朗读速度
$speak.SetOutputToWaveFile('e:不信，你就试试啊.mp3')；//在e盘跟目录生成一个MP3文件。
$speak.Speak('不信，你就试试啊')；//要转成语音的文字
还有一个speak.Voice属性是设置音色的，需要下载才能 设置。
详见官方api。
java如何调用ps1(powershell)命令？
public class Main {
public static void main(String[] args) throws Exception {
txt2Audio("不信，你就试试啊","e:");
}
private static void txt2Audio(String txt, String path) throws Exception {
String cmd1 = "Add-Type -AssemblyName System.speech;";
String cmd2 = "$speak = New-Object System.Speech.Synthesis.SpeechSynthesizer;";
String cmd3 = "$speak.Rate =1;";
String cmd4 = "$speak.SetOutputToWaveFile('" + path + txt + ".mp3');";
String cmd5 = "$speak.Speak('" + txt + "')";
String cmd = cmd1 + cmd2 + cmd3 + cmd4 + cmd5;
exec(cmd);
}
private static String exec(String command) throws Exception {
String cmd = "cmd /c c:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell -ExecutionPolicy RemoteSigned -noprofile -noninteractive ";
command = cmd + command;
StringBuffer sbInput = new StringBuffer();
StringBuffer sbError = new StringBuffer();
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(command);
proc.getOutputStream().close();
InputStream inputstream = proc.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
String line;
while ((line = bufferedreader.readLine()) != null) {
sbInput.append(line + "\n");
}
inputstream = proc.getErrorStream();
inputstreamreader = new InputStreamReader(inputstream);
bufferedreader = new BufferedReader(inputstreamreader);
while ((line = bufferedreader.readLine()) != null) {
sbError.append(line + "\n");
}
if (sbError.length() > 0)
throw new Exception("The command [" + command
+ "] failed to execute!\n\nResult returned:\n"
+ sbError.toString());
return "The command [" + command
+ "] executed successfully!\n\nResult returned:\n"
+ sbInput.toString();
}
}
