本文實(shí)例講述了JSP使用Servlet過濾器進(jìn)行身份驗(yàn)證的方法。分享給大家供大家參考,具體如下:
1、Servlet過濾器的作用描述
(1)在HttpServletRequest到達(dá)Servlet 之前,攔截客戶的HttpServletRequest。
根據(jù)需要檢查HttpServletRequest,也可以修改HttpServletRequest頭和數(shù)據(jù)。
(2)在HttpServletResponse 到達(dá)客戶端之前,攔截HttpServletResponse。
根據(jù)需要檢查HttpServletResponse,可以修改HttpServletResponse頭和數(shù)據(jù)。
2、應(yīng)用Servlet過濾器進(jìn)行身份驗(yàn)證
假設(shè)網(wǎng)站根目錄下的login1.htm、longin1.jsp用于用戶登錄,而chap08目錄下的文件需要用戶登錄后才能訪問。
(1)編寫Servlet過濾器
@WebFilter("/FilterStation")public class FilterStation extends HttpServlet implements Filter {private FilterConfig filterConfig;public FilterStation() {super();}public void destroy() {}public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {HttpSession session=((HttpServletRequest)request).getSession();response.setCharacterEncoding("gb2312");if(session.getAttribute("me")==null){PrintWriter out=response.getWriter();out.print("<script>alert('請(qǐng)登錄!');location.href='../login1.htm'</script>");}else{// pass the request along the filter chainchain.doFilter(request, response);}}public void init(FilterConfig fConfig) throws ServletException {// TODO Auto-generated method stubthis.filterConfig=fConfig;}}(2)配置web.xml
<filter><filter-name>filterstation</filter-name><filter-class>zhou.FilterStation</filter-class></filter><filter-mapping><filter-name>filterstation</filter-name><url-pattern>/chap08/*</url-pattern></filter-mapping>
(3)login1.htm代碼
<html><head><title>用戶登錄</title></head><body><form method="POST" action="login1.jsp"><p>用戶名:<input type="text" name="user" size="18"></p><p>密碼:<input type="text" name="pass" size="20"></p><p><input type="submit" value="提交" name="ok"><input type="reset" value="重置" name="cancel"></p></form></body></html>
(4)login1.jsp代碼
<%@ page contentType="text/html;charset=GB2312" %><html><head><title>Session 應(yīng)用演示</title></head><% if (request.getParameter("user")!=null && request.getParameter("pass")!=null){String strName=request.getParameter("user");String strPass=request.getParameter("pass");if (strName.equals("admin") && strPass.equals("admin")){session.setAttribute("login","OK");session.setAttribute("me",strName);response.sendRedirect("chap08/welcome.jsp");}else{out.print("<script>alert('用戶名或密碼錯(cuò)誤');location.href='login1.htm'</script>");}}%></html>希望本文所述對(duì)大家JSP程序設(shè)計(jì)有所幫助。
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