我有一个记录声音然后上传到服务器的小程序。录音部分已完成,但我卡在上传部分。我的小程序与 vaadin 应用程序集成。我已经成功地使用我的小程序和 vaadin 服务器端进行了请求响应周期。但我无法通过其输出流发送任何数据。我的代码是:
connection = ( HttpURLConnection ) new URL( "http://localhost:8080/CheckResponse/" ).openConnection();
connection.setRequestMethod( "POST" );
connection.setDoOutput( true );
connection.setDoInput(true);
connection.addRequestProperty("applet", "sound recording applet");
//CREATE A WRITER FOR OUTPUT
//outWriter = new PrintWriter( connection.getOutputStream() );
OutputStreamWriter outWriterS = new OutputStreamWriter(connection.getOutputStream());
buff.append( "param1=" );
buff.append( URLEncoder.encode( "Param 1 Value", "UTF-8" ) );
buff.append( "&" );
buff.append( "param2=" );
buff.append( URLEncoder.encode( "Param 2 Value", "UTF-8" ) );
outWriterS.write(buff.toString());
outWriterS.flush();
outWriterS.close();
//RESPONSE STREAM
serverResponse = new BufferedReader( new InputStreamReader( connection.getInputStream() ) );
//READ THE RESPOSNE
String line2;
while ( (line2 = serverResponse.readLine() ) != null )
{
System.out.println( line2 );
}
在服务器端代码:
public void onRequestStart(HttpServletRequest request,
HttpServletResponse response) {
// TODO Auto-generated method stub
try {
if(request.getHeader("applet")!=null){
System.out.println("Request started by applet");
if(request.getHeader("applet").equalsIgnoreCase("sound recording applet")){
System.out.println("Reading the streams");
InputStreamReader reader = new InputStreamReader(request.getInputStream());
BufferedReader buff = new BufferedReader(reader);
System.out.println("Buffer"+buff);
System.out.println("Buffer has :"+buff.readLine());
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println("Request started");
}
bufferReader.readLine() 返回空值。可能是什么原因?谢谢