Servlet使用

最新推荐文章于 2024-11-25 08:57:39 发布

转载最新推荐文章于 2024-11-25 08:57:39 发布 · 193 阅读

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#servlet #string #session #url

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本文深入探讨了Java Web开发中的关键技术，包括重定向、转发、字符集设置、路径匹配及监听器的应用。通过具体实例，详细解析了这些技术的实现方式及其应用场景。

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1.1重定向(如果对方不支持cookie,回写sessionID进行session跟踪)
response.sendRedirect(response.encodeRedirectURL(request.getContextPath()+"/next"));
******************************************************************
1.2转发
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
dispatcher.forward(request,response);
******************************************************************
1.3字符
   request.setCharacterEncoding("utf-8");
   response.setContentType("text/html;charset=utf-8");
******************************************************************
String servletPath = request.getServletPath();
   servletPath = servletPath.substring(servletPath.lastIndexOf("/") + 1);
   String operation = servletPath.substring(0, servletPath.indexOf(".do"));

1.设置连接超时时间(分钟)
<session-config>
   <session-timeout>50</session-timeout>
</session-config>
******************************************************************
4.相对路径匹配
1>绝对匹配 /xx/yy
2>后缀匹配 *.xx
3>后面匹配 /xx/*
******************************************************************
5.监听器
5.1ServletRequestListener
    getServletContext()
    getServletRequest()
requestDestroyed(ServletRequestEvent)
requestInitialized(ServletRequestEvent)
5.2HttpSessionListener
    getSession()
sessionCreated(HttpSessionEvent)
sessionDestroyed(HttpSessionEvent)
5.3ServletContextListener
    getServletContext()
contextInitialized(ServletContextEvent)
contextDestroyed(ServletContextEvent)

5.4ServletRequestAttributeListener
    getName()
    getValue()
attributeAdded(ServletRequestAttributeEvent)
attributeRemoved(ServletRequestAttributeEvent)
attributeReplaced(ServletRequestAttributeEvent)
5.5HttpSessionAttributeListener
    getName()
    getValue()
    getSession()
attributeAdded(HttpSessionBindingEvent)
attributeRemoved(HttpSessionBindingEvent)
attributeReplaced(HttpSessionBindingEvent)
5.6ServletContextAttributeListener
    getName()
    getValue()
attributeAdded(ServletContextAttributeEvent)
attributeRemoved(ServletContextAttributeEvent)
attributeReplaced(ServletContextAttributeEvent)