如何改写一个SIP Message中的SDP内容

The message here is either a Request or a Response.

The sample code is as below:

 

if(message.getContentLength() > 0)

{

       String contentType = message.getContentType();

       message.setContentType("text/plain"); //The SIP Container only can realize this type

       String sdpContent = message.getContent().toString();

       ......// OK,now it just need some operation on String,as the code below

       private void addSDP(SipServletMessage re, String sessionID) {try {re.setContentType("text/plain");String regEx1 = "o=.+";String regEx2 = "c=.+";String newstr1 = "o=SuperServlet %s IN IP4 %s";String newstr2 = "c=IN IP4 0.0.0.0";if (re.getContent() != null) {String sdp = re.getContent().toString();sdp = replace(sdp, regEx1, newstr1);sdp = replace(sdp, regEx2, newstr2);sdp = String.format(sdp, sessionID, MusicServerIP);re.setContent(sdp, "text/plain");re.setContentType("application/sdp");log("TestServlet: addSDP : Result is " + sdp);} else {}} catch (Exception e) {e.printStackTrace();}}public static String replace(String str, String regex, String newStr) {Pattern p = Pattern.compile(regex);Matcher m = p.matcher(str);String s = m.replaceAll(newStr);return s;} 

       message.setContent(sdpContent,"text/plain");

       message.setContentType(contentType);

}