Catalina：与开始/关闭shell脚本交互的主类，因此如果要研究启动和关闭的过程，就从这个类开始看起。
Server：是整个Tomcat组件的容器，包含一个或多个Service。
Service：Service是包含Connector和Container的集合，Service用适当的Connector（多个）接收用户的请求，再发给相应的Container（1个）来处理。
Connector：实现某一协议的连接器，如默认的有实现HTTP、HTTPS、AJP协议的。
Container：可以理解为处理某类型请求的容器，处理的方式一般为把处理请求的处理器包装为Valve对象，并按一定顺序放入类型为Pipeline的管道里。Container有多种子类型：Engine、Host、Context和Wrapper，这几种子类型Container依次包含，处理不同粒度的请求。另外Container里包含一些基础服务，如Loader、Manager和Realm。
Engine：Engine包含Host和Context，接到请求后仍给相应的Host在相应的Context里处理。
Host：就是我们所理解的虚拟主机。
Context：就是我们所部属的具体Web应用的上下文，每个请求都在是相应的上下文里处理的。
Wrapper：Wrapper是针对每个Servlet的Container，每个Servlet都有相应的Wrapper来管理。
Server和Service的联系
StandardServer包含Service接口的引用数组
public void addService(Service service) {
service.setServer(this);
synchronized (services) {
Service results[] = new Service[services.length + 1];
System.arraycopy(services, 0, results, 0, services.length);
results[services.length] = service;
services = results;
if (initialized) {
try {
service.initialize();
} catch (LifecycleException e) {
log.error(e);
}
}
if (started && (service instanceof Lifecycle)) {
try {
((Lifecycle) service).start();
} catch (LifecycleException e) {
;
}
}
// Report this property change to interested listeners
support.firePropertyChange("service", null, service);
}
}Service和Connector与Container的关系
StandardService包含Connector对象的引用数组
public void addConnector(Connector connector) {
synchronized (connectors) {
connector.setContainer(this.container);
connector.setService(this);
Connector results[] = new Connector[connectors.length + 1];
System.arraycopy(connectors, 0, results, 0, connectors.length);
results[connectors.length] = connector;
connectors = results;
if (initialized) {
try {
connector.initialize();
} catch (LifecycleException e) {
log.error(sm.getString(
"standardService.connector.initFailed",
connector), e);
}
}
if (started && (connector instanceof Lifecycle)) {
try {
((Lifecycle) connector).start();
} catch (LifecycleException e) {
log.error(sm.getString(
"standardService.connector.startFailed",
connector), e);
}
}
// Report this property change to interested listeners
support.firePropertyChange("connector", null, connector);
}
}Connector对象
//管理Socket
protected ProtocolHandler protocolHandler = null;Http11Protocol.java
protected Http11ConnectionHandler cHandler = new Http11ConnectionHandler(this);
public void init() throws Exception {
endpoint.setName(getName());
endpoint.setHandler(cHandler);
// Verify the validity of the configured socket factory
try {
if (isSSLEnabled()) {
sslImplementation =
SSLImplementation.getInstance(sslImplementationName);
socketFactory = sslImplementation.getServerSocketFactory(
(String) getAttribute("sslProtocol"));
endpoint.setServerSocketFactory(socketFactory);
} else if (socketFactoryName != null) {
socketFactory = (ServerSocketFactory) Class.forName(socketFactoryName).newInstance();
endpoint.setServerSocketFactory(socketFactory);
}
} catch (Exception ex) {
log.error(sm.getString("http11protocol.socketfactory.initerror"),
ex);
throw ex;
}
if (socketFactory!=null) {
Iterator<String> attE = attributes.keySet().iterator();
while( attE.hasNext() ) {
String key = attE.next();
Object v=attributes.get(key);
socketFactory.setAttribute(key, v);
}
}
try {
endpoint.init();
} catch (Exception ex) {
log.error(sm.getString("http11protocol.endpoint.initerror"), ex);
throw ex;
}
if (log.isInfoEnabled())
log.info(sm.getString("http11protocol.init", getName()));
}Http11Protocol.Http11ConnectionHandler.createProcessor()
//处理socket的Http11Processor阻塞先进先出的队列
protected ConcurrentLinkedQueue<Http11Processor> recycledProcessors =
new ConcurrentLinkedQueue<Http11Processor>() {
protected AtomicInteger size = new AtomicInteger(0);
@Override
public boolean offer(Http11Processor processor) {
//放入Processor，+1
boolean offer = (proto.processorCache == -1) ? true : (size.get() < proto.processorCache);
//avoid over growing our cache or add after we have stopped
boolean result = false;
if ( offer ) {
result = super.offer(processor);
if ( result ) {
size.incrementAndGet();
}
}
if (!result) unregister(processor);
return result;
}
@Override
public Http11Processor poll() {
//使用Processor，-1
Http11Processor result = super.poll();
if ( result != null ) {
size.decrementAndGet();
}
return result;
}
@Override
public void clear() {
Http11Processor next = poll();
while ( next != null ) {
unregister(next);
next = poll();
}
super.clear();
size.set(0);
}
};
// 处理数据
public boolean process(Socket socket) {
//取出头部processer
Http11Processor processor = recycledProcessors.poll();
try {
if (processor == null) {
//如果为空，新建一个
processor = createProcessor();
}
//=========处理
if (processor instanceof ActionHook) {
((ActionHook) processor).action(ActionCode.ACTION_START, null);
}
if (proto.isSSLEnabled() && (proto.sslImplementation != null)) {
processor.setSSLSupport
(proto.sslImplementation.getSSLSupport(socket));
} else {
processor.setSSLSupport(null);
}
processor.process(socket);
return false;
} catch(java.net.SocketException e) {
// SocketExceptions are normal
Http11Protocol.log.debug
(sm.getString
("http11protocol.proto.socketexception.debug"), e);
} catch (java.io.IOException e) {
// IOExceptions are normal
Http11Protocol.log.debug
(sm.getString
("http11protocol.proto.ioexception.debug"), e);
}
// Future developers: if you discover any other
// rare-but-nonfatal exceptions, catch them here, and log as
// above.
catch (Throwable e) {
// any other exception or error is odd. Here we log it
// with "ERROR" level, so it will show up even on
// less-than-verbose logs.
Http11Protocol.log.error
(sm.getString("http11protocol.proto.error"), e);
} finally {
// if(proto.adapter != null) proto.adapter.recycle();
// processor.recycle();
if (processor instanceof ActionHook) {
((ActionHook) processor).action(ActionCode.ACTION_STOP, null);
}
//最终将processer放入队列尾部
recycledProcessors.offer(processor);
}
return false;
}Http11Processor.process()
public void process(Socket theSocket)
throws IOException {
RequestInfo rp = request.getRequestProcessor();
rp.setStage(org.apache.coyote.Constants.STAGE_PARSE);
// Set the remote address
remoteAddr = null;
remoteHost = null;
localAddr = null;
localName = null;
remotePort = -1;
localPort = -1;
// Setting up the I/O
this.socket = theSocket;
inputBuffer.setInputStream(socket.getInputStream());
outputBuffer.setOutputStream(socket.getOutputStream());
// Error flag
error = false;
keepAlive = true;
int keepAliveLeft = maxKeepAliveRequests;
int soTimeout = endpoint.getSoTimeout();
// When using an executor, these values may return non-positive values
int curThreads = endpoint.getCurrentThreadsBusy();
int maxThreads = endpoint.getMaxThreads();
if (curThreads > 0 && maxThreads > 0) {
// Only auto-disable keep-alive if the current thread usage % can be
// calculated correctly
if ((curThreads*100)/maxThreads > 75) {
keepAliveLeft = 1;
}
}
try {
socket.setSoTimeout(soTimeout);
} catch (Throwable t) {
log.debug(sm.getString("http11processor.socket.timeout"), t);
error = true;
}
boolean keptAlive = false;
while (started && !error && keepAlive && !endpoint.isPaused()) {
// Parsing the request header
try {
if (keptAlive) {
if (keepAliveTimeout > 0) {
socket.setSoTimeout(keepAliveTimeout);
}
else if (soTimeout > 0) {
socket.setSoTimeout(soTimeout);
}
}
inputBuffer.parseRequestLine();
request.setStartTime(System.currentTimeMillis());
keptAlive = true;
if (disableUploadTimeout) {
socket.setSoTimeout(soTimeout);
} else {
socket.setSoTimeout(timeout);
}
// Set this every time in case limit has been changed via JMX
request.getMimeHeaders().setLimit(endpoint.getMaxHeaderCount());
inputBuffer.parseHeaders();
} catch (IOException e) {
error = true;
break;
} catch (Throwable t) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("http11processor.header.parse"), t);
}
// 400 - Bad Request
response.setStatus(400);
adapter.log(request, response, 0);
error = true;
}
if (!error) {
// Setting up filters, and parse some request headers
rp.setStage(org.apache.coyote.Constants.STAGE_PREPARE);
try {
prepareRequest();
} catch (Throwable t) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("http11processor.request.prepare"), t);
}
// 400 - Internal Server Error
response.setStatus(400);
adapter.log(request, response, 0);
error = true;
}
}
if (maxKeepAliveRequests > 0 && --keepAliveLeft == 0)
keepAlive = false;
// Process the request in the adapter
if (!error) {
try {
rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
adapter.service(request, response);
// Handle when the response was committed before a serious
// error occurred. Throwing a ServletException should both
// set the status to 500 and set the errorException.
// If we fail here, then the response is likely already
// committed, so we can't try and set headers.
if(keepAlive && !error) { // Avoid checking twice.
error = response.getErrorException() != null ||
statusDropsConnection(response.getStatus());
}
} catch (InterruptedIOException e) {
error = true;
} catch (Throwable t) {
log.error(sm.getString("http11processor.request.process"), t);
// 500 - Internal Server Error
response.setStatus(500);
adapter.log(request, response, 0);
error = true;
}
}
// Finish the handling of the request
try {
rp.setStage(org.apache.coyote.Constants.STAGE_ENDINPUT);
// If we know we are closing the connection, don't drain input.
// This way uploading a 100GB file doesn't tie up the thread
// if the servlet has rejected it.
if(error)
inputBuffer.setSwallowInput(false);
inputBuffer.endRequest();
} catch (IOException e) {
error = true;
} catch (Throwable t) {
log.error(sm.getString("http11processor.request.finish"), t);
// 500 - Internal Server Error
response.setStatus(500);
// No access logging since after service method
error = true;
}
try {
rp.setStage(org.apache.coyote.Constants.STAGE_ENDOUTPUT);
outputBuffer.endRequest();
} catch (IOException e) {
error = true;
} catch (Throwable t) {
log.error(sm.getString("http11processor.response.finish"), t);
error = true;
}
// If there was an error, make sure the request is counted as
// and error, and update the statistics counter
if (error) {
response.setStatus(500);
}
request.updateCounters();
rp.setStage(org.apache.coyote.Constants.STAGE_KEEPALIVE);
// Don't reset the param - we'll see it as ended. Next request
// will reset it
// thrA.setParam(null);
// Next request
inputBuffer.nextRequest();
outputBuffer.nextRequest();
}
rp.setStage(org.apache.coyote.Constants.STAGE_ENDED);
// Recycle
inputBuffer.recycle();
outputBuffer.recycle();
this.socket = null;
// Recycle ssl info
sslSupport = null;
}StandardService包含Container的接口引用
public void setContainer(Container container) {
Container oldContainer = this.container;
if ((oldContainer != null) && (oldContainer instanceof Engine))
((Engine) oldContainer).setService(null);
this.container = container;
if ((this.container != null) && (this.container instanceof Engine))
((Engine) this.container).setService(this);
if (started && (this.container != null) &&
(this.container instanceof Lifecycle)) {
try {
((Lifecycle) this.container).start();
} catch (LifecycleException e) {
;
}
}
//属于原先Container的connector更改
synchronized (connectors) {
for (int i = 0; i < connectors.length; i++)
connectors[i].setContainer(this.container);
}
if (started && (oldContainer != null) &&
(oldContainer instanceof Lifecycle)) {
try {
((Lifecycle) oldContainer).stop();
} catch (LifecycleException e) {
;
}
}
// Report this property change to interested listeners
support.firePropertyChange("container", oldContainer, this.container);
}其中ContainerBase继承了Container
// 子组件通信的管道
protected Pipeline pipeline = new StandardPipeline(this);
// 存放子组件，key->name
protected HashMap children = new HashMap();
public synchronized void start() throws LifecycleException {
// Validate and update our current component state
if (started) {
if(log.isInfoEnabled())
log.info(sm.getString("containerBase.alreadyStarted", logName()));
return;
}
// Notify our interested LifecycleListeners
lifecycle.fireLifecycleEvent(BEFORE_START_EVENT, null);
started = true;
// Start our subordinate components, if any
if ((loader != null) && (loader instanceof Lifecycle))
((Lifecycle) loader).start();
logger = null;
getLogger();
if ((logger != null) && (logger instanceof Lifecycle))
((Lifecycle) logger).start();
if ((manager != null) && (manager instanceof Lifecycle))
((Lifecycle) manager).start();
if ((cluster != null) && (cluster instanceof Lifecycle))
((Lifecycle) cluster).start();
if ((realm != null) && (realm instanceof Lifecycle))
((Lifecycle) realm).start();
if ((resources != null) && (resources instanceof Lifecycle))
((Lifecycle) resources).start();
// Start our child containers, if any
Container children[] = findChildren();
for (int i = 0; i < children.length; i++) {
if (children[i] instanceof Lifecycle)
((Lifecycle) children[i]).start();
}
// Start the Valves in our pipeline (including the basic), if any
if (pipeline instanceof Lifecycle)
((Lifecycle) pipeline).start();
// Notify our interested LifecycleListeners
lifecycle.fireLifecycleEvent(START_EVENT, null);
// Start our thread
threadStart();
// Notify our interested LifecycleListeners
lifecycle.fireLifecycleEvent(AFTER_START_EVENT, null);
}
//Pipeline 是一个管道，Engine 和 Host 都会执行这个 Pipeline，可以在这个管道上增加任意的 Valve，Tomcat 会挨个执行这些 Valve
public synchronized void addValve(Valve valve) {
pipeline.addValve(valve);
fireContainerEvent(ADD_VALVE_EVENT, valve);
}
//取出value进行执行，并且封装成resposne返回
public void invoke(Request request, Response response)
throws IOException, ServletException {
pipeline.getFirst().invoke(request, response);
}
//添加
public void addChild(Container child) {
if (Globals.IS_SECURITY_ENABLED) {
PrivilegedAction dp =
new PrivilegedAddChild(child);
AccessController.doPrivileged(dp);
} else {
addChildInternal(child);
}
}
private void addChildInternal(Container child) {
if( log.isDebugEnabled() )
log.debug("Add child " + child + " " + this);
synchronized(children) {
if (children.get(child.getName()) != null)
throw new IllegalArgumentException("addChild: Child name '" +
child.getName() +
"' is not unique");
child.setParent(this); // May throw IAE
children.put(child.getName(), child);
}
// Start child
// Don't do this inside sync block - start can be a slow process and
// locking the children object can cause problems elsewhere
if (started && startChildren && (child instanceof Lifecycle)) {
boolean success = false;
try {
((Lifecycle) child).start();
success = true;
} catch (LifecycleException e) {
log.error("ContainerBase.addChild: start: ", e);
throw new IllegalStateException
("ContainerBase.addChild: start: " + e);
} finally {
if (!success) {
synchronized(children) {
children.remove(child.getName());
}
}
}
}
fireContainerEvent(ADD_CHILD_EVENT, child);
}
StandardEngine
//只能添加host类型的子Container
public void addChild(Container child) {
if (!(child instanceof Host))
throw new IllegalArgumentException
(sm.getString("standardEngine.notHost"));
super.addChild(child);
}
public final void invoke(Request request, Response response)
throws IOException, ServletException {
// Select the Host to be used for this Request
Host host = request.getHost();
if (host == null) {
response.sendError
(HttpServletResponse.SC_BAD_REQUEST,
sm.getString("standardEngine.noHost",
request.getServerName()));
return;
}
// 取出request的host的下面管道消息进行执行
// Engine包含Host
host.getPipeline().getFirst().invoke(request, response);
}StandardHost
public final void invoke(Request request, Response response)
throws IOException, ServletException {
// Select the Context to be used for this Request
Context context = request.getContext();
if (context == null) {
response.sendError
(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
sm.getString("standardHost.noContext"));
return;
}
// Bind the context CL to the current thread
if( context.getLoader() != null ) {
// Not started - it should check for availability first
// This should eventually move to Engine, it's generic.
Thread.currentThread().setContextClassLoader
(context.getLoader().getClassLoader());
}
// host包含context
// 执行子组件context的value.invoke
context.getPipeline().getFirst().invoke(request, response);
// Access a session (if present) to update last accessed time, based on a
// strict interpretation of the specification
if (Globals.STRICT_SERVLET_COMPLIANCE) {
request.getSession(false);
}
// Error page processing
response.setSuspended(false);
Throwable t = (Throwable) request.getAttribute(Globals.EXCEPTION_ATTR);
if (t != null) {
throwable(request, response, t);
} else {
status(request, response);
}
// Restore the context classloader
Thread.currentThread().setContextClassLoader
(StandardHostValve.class.getClassLoader());
}StandardContext
//初始化Servlet的运行环境
//加载各种资源
public synchronized void start() throws LifecycleException {
………
if( !initialized ) {
try {
init();
} catch( Exception ex ) {
throw new LifecycleException("Error initializaing ", ex);
}
}
………
lifecycle.fireLifecycleEvent(BEFORE_START_EVENT, null);
setAvailable(false);
setConfigured(false);
boolean ok = true;
File configBase = getConfigBase();
if (configBase != null) {
if (getConfigFile() == null) {
File file = new File(configBase, getDefaultConfigFile());
setConfigFile(file.getPath());
try {
File appBaseFile = new File(getAppBase());
if (!appBaseFile.isAbsolute()) {
appBaseFile = new File(engineBase(), getAppBase());
}
String appBase = appBaseFile.getCanonicalPath();
String basePath =
(new File(getBasePath())).getCanonicalPath();
if (!basePath.startsWith(appBase)) {
Server server = ServerFactory.getServer();
((StandardServer) server).storeContext(this);
}
} catch (Exception e) {
log.warn("Error storing config file", e);
}
} else {
try {
String canConfigFile = (new File(getConfigFile())).getCanonicalPath();
if (!canConfigFile.startsWith (configBase.getCanonicalPath())) {
File file = new File(configBase, getDefaultConfigFile());
if (copy(new File(canConfigFile), file)) {
setConfigFile(file.getPath());
}
}
} catch (Exception e) {
log.warn("Error setting config file", e);
}
}
}
………
Container children[] = findChildren();
for (int i = 0; i < children.length; i++) {
if (children[i] instanceof Lifecycle)
((Lifecycle) children[i]).start();
}
if (pipeline instanceof Lifecycle)
((Lifecycle) pipeline).start();
………
}
//执行value
public final void invoke(Request request, Response response)
throws IOException, ServletException {
// Disallow any direct access to resources under WEB-INF or META-INF
MessageBytes requestPathMB = request.getRequestPathMB();
if ((requestPathMB.startsWithIgnoreCase("/META-INF/", 0))
|| (requestPathMB.equalsIgnoreCase("/META-INF"))
|| (requestPathMB.startsWithIgnoreCase("/WEB-INF/", 0))
|| (requestPathMB.equalsIgnoreCase("/WEB-INF"))) {
notFound(response);
return;
}
// Wait if we are reloading
boolean reloaded = false;
while (context.getPaused()) {
reloaded = true;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
;
}
}
// Reloading will have stopped the old webappclassloader and
// created a new one
if (reloaded &&
context.getLoader() != null &&
context.getLoader().getClassLoader() != null) {
Thread.currentThread().setContextClassLoader(
context.getLoader().getClassLoader());
}
// Select the Wrapper to be used for this Request
Wrapper wrapper = request.getWrapper();
if (wrapper == null) {
notFound(response);
return;
} else if (wrapper.isUnavailable()) {
// May be as a result of a reload, try and find the new wrapper
wrapper = (Wrapper) container.findChild(wrapper.getName());
if (wrapper == null) {
notFound(response);
return;
}
}
// Normal request processing
Object instances[] = context.getApplicationEventListeners();
ServletRequestEvent event = null;
if ((instances != null)
&& (instances.length > 0)) {
event = new ServletRequestEvent
(((StandardContext) container).getServletContext(),
request.getRequest());
// create pre-service event
for (int i = 0; i < instances.length; i++) {
if (instances[i] == null)
continue;
if (!(instances[i] instanceof ServletRequestListener))
continue;
ServletRequestListener listener =
(ServletRequestListener) instances[i];
try {
listener.requestInitialized(event);
} catch (Throwable t) {
container.getLogger().error(sm.getString("standardContext.requestListener.requestInit",
instances[i].getClass().getName()), t);
ServletRequest sreq = request.getRequest();
sreq.setAttribute(Globals.EXCEPTION_ATTR,t);
return;
}
}
}
//context包含wrapper
wrapper.getPipeline().getFirst().invoke(request, response);
if ((instances !=null ) &&
(instances.length > 0)) {
// create post-service event
for (int i = 0; i < instances.length; i++) {
if (instances[i] == null)
continue;
if (!(instances[i] instanceof ServletRequestListener))
continue;
ServletRequestListener listener =
(ServletRequestListener) instances[i];
try {
listener.requestDestroyed(event);
} catch (Throwable t) {
container.getLogger().error(sm.getString("standardContext.requestListener.requestDestroy",
instances[i].getClass().getName()), t);
ServletRequest sreq = request.getRequest();
sreq.setAttribute(Globals.EXCEPTION_ATTR,t);
}
}
}
}
//server.xml的reloadable=true，定时重新部署
public void backgroundProcess() {
if (!started) return;
count = (count + 1) % managerChecksFrequency;
if ((getManager() != null) && (count == 0)) {
try {
getManager().backgroundProcess();
} catch ( Exception x ) {
log.warn("Unable to perform background process on manager",x);
}
}
if (getLoader() != null) {
if (reloadable && (getLoader().modified())) {
try {
Thread.currentThread().setContextClassLoader
(StandardContext.class.getClassLoader());
reload();
} finally {
if (getLoader() != null) {
Thread.currentThread().setContextClassLoader
(getLoader().getClassLoader());
}
}
}
if (getLoader() instanceof WebappLoader) {
((WebappLoader) getLoader()).closeJARs(false);
}
}
}
public synchronized void reload() {
// Validate our current component state
if (!started)
throw new IllegalStateException
(sm.getString("containerBase.notStarted", logName()));
// Make sure reloading is enabled
// if (!reloadable)
// throw new IllegalStateException
// (sm.getString("standardContext.notReloadable"));
if(log.isInfoEnabled())
log.info(sm.getString("standardContext.reloadingStarted",
getName()));
// Stop accepting requests temporarily
setPaused(true);
try {
stop();
} catch (LifecycleException e) {
log.error(sm.getString("standardContext.stoppingContext",
getName()), e);
}
try {
start();
} catch (LifecycleException e) {
log.error(sm.getString("standardContext.startingContext",
getName()), e);
}
setPaused(false);
}StandardWrapper.invoke()
Wrapper是最小的组件，与Servlet一一对应，它负责包括的 Servlet 的装载、初始化、执行以及资源回收
public synchronized Servlet loadServlet() throws ServletException {
………
Servlet servlet;
try {
………
ClassLoader classLoader = loader.getClassLoader();
………
Class classClass = null;
………
servlet = (Servlet) classClass.newInstance();
if ((servlet instanceof ContainerServlet) &&
(isContainerProvidedServlet(actualClass) ||
((Context)getParent()).getPrivileged() )) {
((ContainerServlet) servlet).setWrapper(this);
}
classLoadTime=(int) (System.currentTimeMillis() -t1);
try {
instanceSupport.fireInstanceEvent(InstanceEvent.BEFORE_INIT_EVENT,servlet);
if( System.getSecurityManager() != null) {
Class[] classType = new Class[]{ServletConfig.class};
Object[] args = new Object[]{((ServletConfig)facade)};
SecurityUtil.doAsPrivilege("init",servlet,classType,args);
} else {
servlet.init(facade);
}
if ((loadOnStartup >= 0) && (jspFile != null)) {
………
if( System.getSecurityManager() != null) {
Class[] classType = new Class[]{ServletRequest.class,
ServletResponse.class};
Object[] args = new Object[]{req, res};
SecurityUtil.doAsPrivilege("service",servlet,classType,args);
} else {
servlet.service(req, res);
}
}
instanceSupport.fireInstanceEvent(InstanceEvent.AFTER_INIT_EVENT,servlet);
………
return servlet;
}调用次序
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