com.anysoft.webloader.WebAppMain Maven / Gradle / Ivy
package com.anysoft.webloader;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.anysoft.util.Factory;
import com.anysoft.util.IOTools;
import com.anysoft.util.Properties;
import com.anysoft.util.Settings;
import com.anysoft.util.XmlTools;
import com.anysoft.util.resource.ResourceFactory;
/**
* WebApp主入口
*
* 用于替代WebAppContextListener，在WebAppContextListener的基础上增加下列功能:
* - 可加载附加的ServletContextListener
* - 可加载附加的Servlet
*
* @author duanyy
*
* @since 1.6.0.1
* @version 1.6.4.17 [20151216 duanyy]
* - 根据sonar建议优化代码
*
* @version 1.6.4.24 [20150115 duanyy]
* - 增加对SessionListener的支持
*/
public class WebAppMain extends WebAppContextListener implements HttpSessionListener{
protected List listeners = null;
protected List sessionListeners = null;
@Override
public void onContextDestroyed(ServletContextEvent e) {
//销毁所创建的ServletContextListener
if (listeners != null){
for (ServletContextListener l:listeners){
if (l != null){
l.contextDestroyed(e);
}
}
}
}
@Override
public void onContextInitialized(ServletContextEvent e) {
Settings settings = Settings.get();
String addons = settings.GetValue("webcontext.addons", "");
if (addons != null && addons.length() > 0){
logger.info("Load addons...");
ResourceFactory rm = Settings.getResourceFactory();
InputStream in = null;
try {
in = rm.load(addons, null);
Document doc = XmlTools.loadFromInputStream(in);
if (doc != null){
//装入context-param
loadContextParams(settings,doc.getDocumentElement(),e.getServletContext());
//装入listener
loadContextListeners(settings,doc.getDocumentElement(),e);
//装入SessionListener
loadSessionListeners(settings,doc.getDocumentElement());
//在装入其他
WebXMLLoader loader = createXMLLoader(settings);
if (loader != null){ // NOSONAR
loader.load(settings,doc.getDocumentElement(), e.getServletContext());
}
}
}catch (Exception ex){
logger.error("Error occurs when load xml file,source=" + addons, ex);
}finally {
IOTools.closeStream(in);
}
}
}
protected void loadSessionListeners(Settings settings,Element root) {
NodeList nodeList = XmlTools.getNodeListByPath(root, "session");
if (nodeList != null && nodeList.getLength() > 0){
sessionListeners = new ArrayList();
for (int i = 0 ;i < nodeList.getLength() ; i ++){
Node n = nodeList.item(i);
if (n.getNodeType() != Node.ELEMENT_NODE){
continue;
}
Element e = (Element)n;
String clazz = e.getAttribute("listener-class");
if (clazz == null || clazz.length() <= 0){
continue;
}
Factory factory = new Factory();
try {
HttpSessionListener _listener = factory.newInstance(clazz);
if (_listener != null){
logger.info("Session listener is found,module=" + clazz);
sessionListeners.add(_listener);
}
}catch (Exception ex){
logger.error("Can not create context listener,module=" + clazz,ex);
}
}
}
}
/**
* 装入ContextListener，可支持多个ContextListener
*
* @param settings
* @param root
* @param event
*/
protected void loadContextListeners(Properties settings,Element root,ServletContextEvent event) {
NodeList nodeList = XmlTools.getNodeListByPath(root, "listener");
if (nodeList != null && nodeList.getLength() > 0){
listeners = new ArrayList(nodeList.getLength());
for (int i = 0 ;i < nodeList.getLength() ; i ++){
Node n = nodeList.item(i);
if (n.getNodeType() != Node.ELEMENT_NODE){
continue;
}
Element e = (Element)n;
String clazz = e.getAttribute("listener-class");
if (clazz == null || clazz.length() <= 0){
continue;
}
Factory factory = new Factory();
try {
ServletContextListener listner = factory.newInstance(clazz);
if (listner != null){
logger.info("Init context listener,module=" + clazz);
listner.contextInitialized(event);
listeners.add(listner);
}
}catch (Exception ex){
logger.error("Can not create context listener,module=" + clazz,ex);
}
}
}
}
/**
* 创建WebXMLLoader实例
*
* 通过环境变量webcontext.xmlloader指定的类名来创建WebXMLLoader实例。缺省为DefaultWebXMLLoader。
* 如果无法创建成功，返回空。
*
* @param settings
* @return WebXMLLoader实例
*/
protected WebXMLLoader createXMLLoader(Properties settings){
String loader = settings.GetValue("webcontext.xmlloader",DefaultWebXMLLoader.class.getName());
WebXMLLoader.TheFactory factory = new WebXMLLoader.TheFactory();
try{
return factory.newInstance(loader, settings);
}catch (Exception ex){
logger.error("Can not create a webxml loader.",ex);
return null;
}
}
/**
* 装入context-param信息
*
* @param settings
* @param root
* @param sc
*/
protected void loadContextParams(Properties settings,Element root, ServletContext sc) {
NodeList params = XmlTools.getNodeListByPath(root, "context-param");
if (params != null && params.getLength() > 0){
for (int i = 0 ; i < params.getLength() ; i ++){
Node n = params.item(i);
if (n.getNodeType() != Node.ELEMENT_NODE){
continue;
}
Element e = (Element)n;
String name = e.getAttribute("param-name");
String pattern = e.getAttribute("param-value");
if (name != null && pattern != null && name.length() > 0 && pattern.length() > 0){
String value = settings.transform(pattern);
logger.info("Init parameter:" + name + "=" + value);
sc.setInitParameter(name, value);
}
}
}
}
@Override
public void sessionCreated(HttpSessionEvent se) {
if (sessionListeners != null){
for (HttpSessionListener l:sessionListeners){
if (l != null){
l.sessionCreated(se);
}
}
}
}
@Override
public void sessionDestroyed(HttpSessionEvent se) {
if (sessionListeners != null){
for (HttpSessionListener l:sessionListeners){
if (l != null){
l.sessionDestroyed(se);
}
}
}
}
}