Java 用JainSip实现服务器端SIP通讯----之监听篇
Java web服务器实现SIP通讯（或GB28181），一般有两种选择：SipServlet和JainSip
前者更适合服务器，后者较适合客户端
前者用类似web servlet的方式实现了sip通信，直接就实现了多线程的sip通信的并发
后者相对底层一点，不具有并发能力
但，前者需要Web容器的支持，目前好象能用的只有两三种，且与web servlet并存性好像也不好
故，考虑到要用tomcat容器，所以用JainSip实现具有sip通信能力的web服务器
１. 设计思路
JainSip实现，主要是面向SipListener监听接口编程
此监听接口一个项目中只能有一个实现，但可以同时对多个端口进行监听
一个监听端口对应一个ListeningPoint监听对象，并由一个SipProvider对象管理
此接口要实现６个处理方法：
public void processRequest(RequestEvent evt)
public void processResponse(ResponseEvent evt)
public void processTimeout(TimeoutEvent evt)
public void processTransactionTerminated(TransactionTerminatedEvent evt)
public void processDialogTerminated(DialogTerminatedEvent evt)
public void processIOException(IOExceptionEvent evt)
这些方法是串行处理的，要用多线程实现并行处理
前两个是接收消息，发送sip消息要用对应端口的SipProvider对象来发送
２. 监听的建立
建立实现SipListener接口的基类：
public abstract class Siplistener implements SipListener
构造函数中设置sip工厂类参数：
sipFactory = SipFactory.getInstance();
sipFactory.setPathName("gov.nist");
用一个方法创建监听：
public void createListenPoint(String listenerName, String serverName, String ip, int port)
//创建SipStack
Properties properties = new Properties();
properties.setProperty("javax.sip.STACK_NAME", serverName);
properties.setProperty("javax.sip.IP_ADDRESS", ip);
properties.setProperty("gov.nist.javax.sip.TRACE_LEVEL", 32);
properties.setProperty("gov.nist.javax.sip.SERVER_LOG", "textclient.txt");
properties.setProperty("gov.nist.javax.sip.DEBUG_LOG", "textclientdebug.log");
SipStack sipStack = sipFactory.createSipStack(proerties);
//udp 创建SipProvider
SipProvider sipProvider;
ListeningPoint udp = sipStack.createListeningPoint(ip, port, "udp");
sipProvider = sipStack.createSipProvider(udp);
//保存SipProvider对象
String strHashcode = Integer.toHexString(sipProvider.hashCode());
sipProviderMap.put(strHashcode, sipProvider);
sipProviderNameMap.put(listenerName+"/udp", strHashcode);
sipProviderNameMap.put(strHashcode, listenerName+"/udp");
sipProvider.addSipListener(this);
//tcp 创建SipProvider
ListeningPoint tcp = sipStack.createListeningPoint(ip, port, "tcp");
sipProvider = sipStack.createSipProvider(tcp);
//保存SipProvider对象
String strHashcode = Integer.toHexString(sipProvider.hashCode());
sipProviderMap.put(strHashcode, sipProvider);
sipProviderNameMap.put(listenerName+"/tcp", strHashcode);
sipProviderNameMap.put(strHashcode, listenerName+"/tcp");
sipProvider.addSipListener(this);
可以建立多个端口的tcp/udp监听，需根据监听名和传输类型方便取出各自的SipProvider
3. 处理线程
建立请求处理线程：
public abstract class SipProcessReqThread implements Runnable {
protected Siplistener siplistener;
protected Request req;
protected RequestEvent evt;
protected SipProvider sipProvider;
protected String listenerName;
public void run() {
if(null!=req){
onProcess();
}
}
protected abstract void onProcess();
public void setParam(Siplistener siplistener, Request req, RequestEvent evt, SipProvider sipProvider, String listenerName) {
this.siplistener=siplistener;
this.req=req;
this.evt=evt;
this.sipProvider=sipProvider;
this.listenerName=listenerName;
}
}
超时处理线程：
public abstract class SipDialogTimeout implements Runnable {
protected TimeoutEvent evt;
protected Dialog dialog;
protected boolean isReturn;
public void run() {
if(evt.isServerTransaction()){
ServerTransation serverTransation = evt.getServerTransation();
if(serverTransation!=null){
dialog=serverTransation.getDialog();
}
isReturn = true;
}else{
ClientTransation clientTransation = evt.getClientTransation();
if(clientTransation!=null){
dialog=clientTransation.getDialog();
}
isReturn = true;
}
if(null!=dialog){
onProcess(isReturn);
}
}
protected abstract void onProcess(boolean isReturn);
public void setParam(TimeoutEvent evt) {
this.evt=evt;
}
}
其它处理线程与上面的类似
4. 处理方法
接收请求的处理：
public void processRequest(RequestEvent evt) {
Request req = evt.getRequest();
String str=evt.getSource().toString();
str=str.substring(str.indexOf('@')+1);
SipProvider sipProvider=sipProviderMap.get(str);
String strHashcode=Integer.toHexString(sipProvider.hashCode());
String strListenerName=sipListenerNameMap.get(strHashcode);
SipProcessReqThread sipProcessReqThread=new_SipProcessReqThread();
sipProcessReqThread.setParam(this, req, evt, sipProvider, strListenerName);
startThread(sipProcessReqThread);
}
超时处理：
public void processTimeout(TimeoutEvent evt) {
SipDialogTimeout sipDialogTimeout=new_SipDialogTimeout();
sipDialogTimeout.setParam(evt);
startThread(sipDialogTimeout);
}
其它处理与之类似
启动Runnable线程的共用方法：
private void startThread(Runnable runnable) {
Thread thread=new Thread(runnable);
try{
thread.start();
}catch(Exception e){
}
}
5. 发送请求
public boolean sendRequest(String name, String type, Request req) {
SipProvider sipProvider=getProvider(name,type);
if(sipProvider==null){
return false;
}
try{
sipProvider.sendRequest(req);
}catch(SipException e){
return false;
}
return true;
}
6. 处理对象的注入
用方法
public abstract SipDialogTimeout new_SipDialogTimeout();
public abstract SipProcessReqThread new_ProcessReqThread();
public abstract SipProcessRespThread new_ProcessRespThread();
子类实现后，注入新对象
7. Jar包
concurrent.jar
JainSipApi1.2.jar
JainSipRi1.2.jar
log4j-1.2.8.jar