WebのListener【Listener】とフィルタ【Filter】の例
6773 ワード
Listenerインスタンス:
Webでxmlで追加
ログイン時
ページ呼び出し:import="com.oddel.listener.SessionFactory;SessionFactory.getInstance().isOnline(userid)はtrueを返し、ユーザーが現在オンラインであることを示します.falseに戻ると、ユーザーが現在オンラインではないことを示します.
参考ブログ:
http://www.cnblogs.com/sherryueda/p/4273169.html
フィルタ:
Webでxmlで
参考ブログ:
http://www.cnblogs.com/sherryueda/p/4275805.html
package com.gwssi.listener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class SessionListener implements HttpSessionListener {
@Override
public void sessionCreated(HttpSessionEvent event) {
HttpSession session = event.getSession();
SessionBean sessionBean = SessionFactory.getInstance().getSessionBean();
System.out.println("sessionCreated session: " + (session.getId()));
System.out.println("sessionCreated accessCount: "
+ (sessionBean.getAccessCount()));
//
sessionBean.setAccessCount(sessionBean.getAccessCount() + 1);
//
sessionBean.getOnline().put(session.getId(), null);
}
@Override
public void sessionDestroyed(HttpSessionEvent event) {
HttpSession session = event.getSession();
SessionFactory factory = SessionFactory.getInstance();
SessionBean sessionBean = factory.getSessionBean();
System.out.println("sessionDestroyed session: " + (session.getId()));
System.out.println("sessionDestroyed accessCount: "
+ (sessionBean.getAccessCount()));
factory.removeLogin(session);
}
}
package com.gwssi.listener;
import javax.servlet.http.HttpSession;
public class SessionFactory {
private SessionBean sessionBean = new SessionBean();
private static SessionFactory factory;
private SessionFactory() {
}
static {
factory = new SessionFactory();
}
public synchronized static SessionFactory getInstance() {
if (factory == null) {
factory = new SessionFactory();
}
return factory;
}
public void addLogin(HttpSession session, String user) {
this.getSessionBean().getOnline().put(session.getId(), user);
this.getSessionBean().getLogin().add(user);
}
public void removeLogin(HttpSession session) {
this.getSessionBean().getLogin()
.remove(this.getSessionBean().getOnline().get(session.getId()));
this.getSessionBean().getOnline().remove(session.getId());
}
public boolean isOnline(String user) {
return this.getSessionBean().getLogin().contains(user);
}
public SessionBean getSessionBean() {
return sessionBean;
}
public void setSessionBean(SessionBean sessionBean) {
this.sessionBean = sessionBean;
}
}
package com.gwssi.listener;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class SessionBean {
private Map<String, String> online = new HashMap<String, String>();
private int accessCount = 0;
private Set<String> login = new HashSet<String>();
/**
*
*
*
* @return int
*/
public int getOnlineCount() {
return this.online.size();
}
/**
*
*
* @return int
*/
public int getLoginCount() {
return this.getLogin().size();
}
public Map<String, String> getOnline() {
return online;
}
public void setOnline(Map<String, String> online) {
this.online = online;
}
public int getAccessCount() {
return accessCount;
}
public void setAccessCount(int accessCount) {
this.accessCount = accessCount;
}
public Set<String> getLogin() {
return login;
}
public void setLogin(Set<String> login) {
this.login = login;
}
}
Webでxmlで追加
<session-config>
<session-timeout>10</session-timeout>
</session-config>
<listener>
<listener-class>com.gwssi.listener.SessionListener</listener-class>
</listener>
ログイン時
// SessionFactory,
SessionFactory.getInstance().addLogin(session, userInfo.getUserId());
ページ呼び出し:import="com.oddel.listener.SessionFactory;SessionFactory.getInstance().isOnline(userid)はtrueを返し、ユーザーが現在オンラインであることを示します.falseに戻ると、ユーザーが現在オンラインではないことを示します.
参考ブログ:
http://www.cnblogs.com/sherryueda/p/4273169.html
フィルタ:
package com.gwssi.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import cn.gwssi.csdb.fbk.util.StringUtil;
public class SessionCheckFilter implements Filter {
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
String userid = request.getParameter("userid");
// System.out.println(request.getServletPath() + "===SessionCheckFilter====" + userid);
if (StringUtil.isEmpty(userid) || "null".equals(userid)) {
// userid ,
chain.doFilter(req, res);
} else {
HttpSession session = request.getSession();
UserInfo userInfo = (UserInfo) session.getAttribute("userInfo");
HttpServletResponse response = (HttpServletResponse) res;
if (userInfo == null) {
// session
redirect(request, response);
} else {
System.out.println(userInfo.getUserId() + "========" + userid);
if (userid.equals(userInfo.getUserId())) {
chain.doFilter(req, res);
} else {
//
redirect(request, response);
}
}
}
}
private void redirect(HttpServletRequest request,
HttpServletResponse response) throws IOException {
String requestType = request.getHeader("X-Requested-With");
if (requestType != null && requestType.equals("XMLHttpRequest")) {
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
} else {
String href = request.getContextPath()
+ "/pages/sessionTimeOut.jsp";
response.sendRedirect(href);
}
}
@Override
public void init(FilterConfig config) throws ServletException {
}
}
Webでxmlで
<filter>
<filter-name>sessionCheckFilter</filter-name>
<filter-class>com.gwssi.csdb.fbk.authority.SessionCheckFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>sessionCheckFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
参考ブログ:
http://www.cnblogs.com/sherryueda/p/4275805.html