有关getServletContext

lyj57 2013-04-24 11:52:27

public void parseRequest(HttpServletRequest request){
System.out.println("parseRequest:"+request.getParameter("username"));
System.out.println("realPath:"+request.getServletContext().getRealPath("/"));
path=request.getServletContext().getRealPath("/test_db.accdb");
ConnectAccessFile(request.getParameter("username"));

}
上面是TestAction.java中的几句，运行提示错误
The method getServletContext() is undefined for the type HttpServletRequest
The method getServletContext() is undefined for the type HttpServletRequest

求助啊！这要怎么解决

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还原本质 2015-05-18

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引用 3 楼 jia20003 的回复:

request.getSession().getServletContext().getRealPath("/"));

学习了，谢谢

菖蒲老先生 2013-04-24

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压根就没这方法，你代码编译不报错么。。。

花谢尊前不敢香 2013-04-24

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getServletContext() 这个方法在Servlet 3.0规范里才有，你是tomcat6？要tomcat7才行的

gloomyfish 2013-04-24

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request.getServletContext().getRealPath("/")

在高版本的servlet中已经不支持这个API了

gloomyfish 2013-04-24

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request.getSession().getServletContext().getRealPath("/"));

getServletContext()空指针异常的原因getServletContext()空指针异常的原因getServletContext()空指针异常的原因getServletContext()空指针异常的原因getServletContext()空指针异常的原因

Request中getContextPath、getServletPath、getRequestURI、request.getRealPath的区别

JSP request ---> service HttpSession ----> request.getSession(); ServletContext 1 ServletConfig.getServletContext(); 2 ServletContextEvent.getServletContext(); 3 HttpSession.getServletContext(); ------------------------------------------------ JSP Java Server Page java服务页面更强大的Servlet Servlet升级 Servlet 问题 1 XXXViewServlet out.println(""); out.println(""); 不善于做显示页面 2 Java程序 java---> javac ---> 启动tomcat 修改繁琐

protected void doPost HttpServletRequest request HttpServletResponse response throws ServletException IOException { String action request getParameter "action" ; Teacher t new Teacher ; t setUsername request getParameter "username" ; if "register" equals action { t setPassword MD5 generateMD5 request getParameter "password" ; if teacherDao add t >0 { request getSession setAttribute "mess" "恭喜注册成功 " ; response sendRedirect "login jsp" ; }else{ response sendRedirect "error jsp" ; } }else if "login" equals action { t setPassword MD5 generateMD5 request getParameter "password" ; if teacherDao queryByTeacher t size >0 { Constants ONLINE COUNT++; Object oCount getServletContext getAttribute "count" ; if oCount null { getServletContext setAttribute "count" 1 ; }else{ getServletContext setAttribute "count" Integer getServletContext getAttribute "count" +1 ; } request getSession setAttribute "teacher" t ; request getSession setAttribute "students" studentDao queryStudentsByTeacher t ; if request getParameter "autoLogin" null { Cookie cookie1 new Cookie "username" t getUsername ; Cookie cookie2 new Cookie "password" t getPassword ; cookie1 setMaxAge 60 60 24 14 ; cookie2 setMaxAge 60 60 24 14 ; response addCookie cookie1 ; response addCookie cookie2 ; } response sendRedirect "index jsp" ; }else{ request setAttribute "mess" "用户名或密码错误 " ; request getRequestDispatcher "login jsp" forward request response ; } }else if "autoLogin" equals action { t setPassword request getParameter "password" ; if teacherDao queryByTeacher t size >0 { Constants ONLINE COUNT++; Object oCount getServletContext getAttribute "count" ; if oCount null { getServletContext setAttribute "count" 1 ; }else{ getServletContext setAttribute "count" Integer getServletContext getAttribute "count" +1 ; } request getSession setAttribute "teacher" t ; request getSession setAttribute "students" studentDao queryStudentsByTeacher t ; response sendRedirect "index jsp" ; }else{ request setAttribute "mess" "用户名或密码错误 " ; Cookie[] cookies request getCookies ; if cookies null { for Cookie cookie : cookies { if "username" equals cookie getName || "password" equals cookie getName { cookie setValue null ; 关键 cookie setMaxAge 0 ; response addCookie cookie ; } } } request getRequestDispatcher "login jsp" forward request response ; } }else if "loginOut" equals action { request getSession invalidate ; response sendRedirect "login jsp" ; } }">protected void doPost HttpServletRequest request HttpServletResponse response throws ServletException IOException { String action request getParameter "action" ; Teacher t new Teacher ; t setUsername request getParameter "username" ; if "register" equals ac [更多]

介绍 ServletContext对象的一些重要方法的示例代码

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