aje网站润色,网上怎么注册网址,上海已经开始二次感染,电商网站建设优化filter过滤器主要使用于前台向后台传递数据是的过滤操作。程度很简单就不说明了#xff0c;直接给几个已经写好的代码#xff1a; 一、使浏览器不缓存页面的过滤器 Java代码 import javax.servlet.*;import javax.servlet.http.HttpServletResponse;import java.io.IOExcept… filter过滤器主要使用于前台向后台传递数据是的过滤操作。程度很简单就不说明了直接给几个已经写好的代码 一、使浏览器不缓存页面的过滤器 Java代码 import javax.servlet.*;import javax.servlet.http.HttpServletResponse;import java.io.IOException; /** * 用于的使 Browser 不缓存页面的过滤器 */public class ForceNoCacheFilter implements Filter { public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { ((HttpServletResponse) response).setHeader(Cache-Control,no-cache); ((HttpServletResponse) response).setHeader(Pragma,no-cache); ((HttpServletResponse) response).setDateHeader (Expires, -1); filterChain.doFilter(request, response); } public void destroy() { } public void init(FilterConfig filterConfig) throws ServletException { }} 二、检测用户是否登陆的过滤器 import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.util.List; import java.util.ArrayList; import java.util.StringTokenizer; import java.io.IOException; /** * 用于检测用户是否登陆的过滤器如果未登录则重定向到指的登录页面p * 配置参数p * checkSessionKey 需检查的在 Session 中保存的关键字br/ * redirectURL 如果用户未登录则重定向到指定的页面URL不包括 ContextPathbr/ * notCheckURLList 不做检查的URL列表以分号分开并且 URL 中不包括 ContextPathbr/ */ public class CheckLoginFilter implements Filter { protected FilterConfig filterConfig null; private String redirectURL null; private List notCheckURLList new ArrayList(); private String sessionKey null; public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request (HttpServletRequest) servletRequest; HttpServletResponse response (HttpServletResponse) servletResponse; HttpSession session request.getSession(); if(sessionKey null) { filterChain.doFilter(request, response); return; } if((!checkRequestURIIntNotFilterList(request)) session.getAttribute(sessionKey) null) { response.sendRedirect(request.getContextPath() redirectURL); return; } filterChain.doFilter(servletRequest, servletResponse); } public void destroy() { notCheckURLList.clear(); } private boolean checkRequestURIIntNotFilterList(HttpServletRequest request) { String uri request.getServletPath() (request.getPathInfo() null ? : request.getPathInfo()); return notCheckURLList.contains(uri); } public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig filterConfig; redirectURL filterConfig.getInitParameter(redirectURL); sessionKey filterConfig.getInitParameter(checkSessionKey); String notCheckURLListStr filterConfig.getInitParameter(notCheckURLList); if(notCheckURLListStr ! null) { StringTokenizer st new StringTokenizer(notCheckURLListStr, ;); notCheckURLList.clear(); while(st.hasMoreTokens()) { notCheckURLList.add(st.nextToken()); } } } } 三、字符编码的过滤器 import javax.servlet.*; import java.io.IOException; /** * 用于设置 HTTP 请求字符编码的过滤器通过过滤器参数encoding指明使用何种字符编码,用于处理Html Form请求参数的中文问题 */ public class CharacterEncodingFilter implements Filter { protected FilterConfig filterConfig null; protected String encoding ; public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { if(encoding ! null) servletRequest.setCharacterEncoding(encoding); filterChain.doFilter(servletRequest, servletResponse); } public void destroy() { filterConfig null; encoding null; } public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig filterConfig; this.encoding filterConfig.getInitParameter(encoding); } } 四、记录用户的访问操作器 代码package com.qwserv.itm.pfl.log.svr; 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 java.text.SimpleDateFormat;import javax.servlet.http.HttpServletRequest;import com.qwserv.itm.api.pfl.sm.vo.Person;import java.sql.*;import com.qwserv.itm.api.ServiceAccess;import com.qwserv.itm.util.toolkit.DebugUtil; public class ObserveFilter implements Filter { protected static DebugUtil log DebugUtil.getInstances(pfl-log, ObserveFilter.class); public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { //记录用户的访问操作 HttpServletRequest request1 (HttpServletRequest)request; StringBuffer url request1.getRequestURL(); //对url进行过滤如果是js/css/image则不进行处理 if (judgeFile(url.toString())){ String operTime new SimpleDateFormat(yyyy-MM-dd HH:mm:ss). format(new java.util.Date()); String hostIp request.getRemoteAddr(); String sessionId request1.getRequestedSessionId(); String userId ; Person person (Person)request1.getSession().getAttribute(userObj); if (null ! person null ! person.getUser()){ userId person.getUser().getId(); } String queryString request1.getQueryString(); if (null ! queryString) { url.append(?); url.append(queryString); } //保存到数据库中 saveToDb(userId,hostIp,sessionId,url.toString(),operTime,); } // Pass control on to the next filter chain.doFilter(request, response); } public void init(FilterConfig filterConfig) throws ServletException { } public boolean judgeFile(String url){ if (url.endsWith(.gif) || url.endsWith(.jpg) || url.endsWith(.png) || url.endsWith(.bmp) || url.endsWith(.css) || url.endsWith(.js) || url.endsWith(.jsx)){ return false; } else { return true; } } public int saveToDb(String userId, String hostIp,String sessionId,String url, String operTime,String desc){ //将报表任务数据保存到数据库中 Connection conn null; Statement st null; try { //构造sql表达式将数据插入数据库 conn ServiceAccess.getSystemSupportService().getDefaultConnection(); st conn.createStatement(); String sql insert into LOG_OBSERVE_HISTORY(USERID,URL,Detail,SessionID,HostName,StartDate) values( userId , url , desc , sessionId , hostIp , operTime ); if (ServiceAccess.getSystemSupportService().getConnectionType(conn)ServiceAccess.getSystemSupportService().JCA_TYPE_ORACLE){ sql insert into LOG_OBSERVE_HISTORY(Id,USERID,URL,Detail,SessionID,HostName,StartDate) values(LOG_OBSERVE_SEQ.nextval, userId , url , desc , sessionId , hostIp ,TO_DATE( operTime ,YYYY-MM-DD HH24:MI:SS)); } st.executeUpdate(sql); } catch (Exception e) { e.printStackTrace(); log.error(--------------------The url String is: url -------------------------------); return 1; //表示操作失败 } finally { if (null ! st) { try{ st.close(); } catch(Exception e) { e.printStackTrace(); } st null; } if (conn ! null) { try { conn.close(); } catch (Exception e) { e.printStackTrace(); } conn null; } } return 0; //表示操作成功 }} filter filter-nameObserveFilter/filter-name filter-classcom.qwserv.itm.pfl.log.svr.ObserveFilter/filter-class /filter filter-mapping filter-nameObserveFilter/filter-name url-pattern/*/url-pattern /filter-mapping 五.Filter防止用户访问一些未被授权的资源 package com.drp.util.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; public class AuthFilter implements Filter { public void destroy() { } public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {//1,doFilter方法的第一个参数为ServletRequest对象。此对象给过滤器提供了对进入的信息包括表单数据、cookie和HTTP请求头的完全访问。第二个参数为ServletResponse通常在简单的过滤器中忽略此参数。最后一个参数为FilterChain此参数用来调用servlet或JSP页。 HttpServletRequest request (HttpServletRequest)servletRequest;//;//如果处理HTTP请求并且需要访问诸如getHeader或getCookies等在ServletRequest中无法得到的方法就要把此request对象构造成HttpServletRequest HttpServletResponse response (HttpServletResponse)servletResponse。 String currentURL request.getRequestURI();//取得根目录所对应的绝对路径: String targetURL currentURL.substring(currentURL.indexOf(/, 1), currentURL.length()); //截取到当前文件名用于比较 HttpSession session request.getSession(false); if (!/login.jsp.equals(targetURL)) {//判断当前页是否是重定向以后的登录页面页面如果是就不做session的判断防止出现死循环 if (session null || session.getAttribute(user) null) {//*用户登录以后需手动添加session System.out.println(request.getContextPath() request.getContextPath()); response.sendRedirect(request.getContextPath() /login.jsp);//如果session为空表示用户没有登录就重定向到login.jsp页面 return; } } //加入filter链继续向下执行 filterChain.doFilter(request, response);//.调用FilterChain对象的doFilter方法。Filter接口的doFilter方法取一个FilterChain对象作为它的一个参数。在调用此对象的doFilter方法时激活下一个相关的过滤器。如果没有另一个过滤器与servlet或JSP页面关联则servlet或JSP页面被激活。 } public void init(FilterConfig filterConfig) throws ServletException { } } filter filter-nameAuthFilter/filter-name filter-classcom.drp.util.filter.AuthFilter/filter-class /filter filter-mapping filter-nameAuthFilter/filter-name url-pattern*.jsp/url-pattern//表示对所有jsp文件有效 /filter-mapping转载于:https://www.cnblogs.com/yqskj/articles/2226774.html
