使用Filter过滤器，控制不能直接访问JSP文件

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在项目中，我们需要控制用户不能直接访问JSP页面，需要实现此功能很简单，1.使用过滤器控制如果用户请求了JSP页面，直接跳转到指定的URL，如主页，2.在web.xml文件中配置，当服务器启动时，自动加载过滤器

1、编码JspFilter过滤器，需要实现Filter

package com.weixin.common.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;/** * JSP过滤器,不能直接访问JSP *  * @author Administrator * */public class JspFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {// TODO Auto-generated method stub}@Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest httpServletRequest = (HttpServletRequest) request;HttpServletResponse httpServletResponse = (HttpServletResponse) response;String url = httpServletRequest.getRequestURI();if (url != null && url.endsWith(".jsp")) {// TODO 这里可以跳转到主页String contextPath = httpServletRequest.getContextPath();httpServletResponse.sendRedirect(contextPath + "/user/index.do");return;}chain.doFilter(httpServletRequest, httpServletResponse);}@Overridepublic void destroy() {// TODO Auto-generated method stub}}

2、web.xml中配置过滤器，当服务器启动时，自动加载过滤器

  <!-- jsp过滤器 start -->  <filter>  <filter-name>jspFilter</filter-name>  <filter-class>com.weixin.common.filter.JspFilter</filter-class>  </filter>  <filter-mapping>  <filter-name>jspFilter</filter-name>  <url-pattern>/*</url-pattern>  </filter-mapping>  <!-- jsp过滤器 end -->

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