JAVA三大有用的过滤器
来源:互联网 发布:ubuntu 安装maven3 编辑:程序博客网 时间:2024/06/05 04:51
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
Java代码
- 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 ContextPath<br/>
- * notCheckURLList 不做检查的URL列表,以分号分开,并且 URL 中不包括 ContextPath<br/>
- */
- 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
Java代码
- 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");
- }
- }
0 0
- JAVA三大有用的过滤器
- java Filter__五个有用的过滤器(三)
- java Filter__五个有用的过滤器(三)
- 几个有用的过滤器(java)
- 四个有用的Java过滤器
- 四个有用的Java过滤器
- Java 五个有用的过滤器
- java 五个有用的过滤器
- 四个有用的Java过滤器
- java四个有用的过滤器
- 四个有用的Java过滤器收藏
- 四个有用的Java过滤器(转)
- 几个有用的过滤器
- 四个有用的过滤器
- 五个有用的过滤器
- 五个有用的过滤器
- 五个有用的过滤器
- 五个有用的过滤器
- 遥感分类结果变化检测
- mysql修改数据库默认编码
- hdu 1002 A + B Problem II
- 关于 setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key的另一种错误
- Cocos2d-x 瓦块地图小游戏 (二) 用Tiled创建自己的游戏地图
- JAVA三大有用的过滤器
- hdu 1575Tr A 矩阵快速幂
- java MapReduce步骤
- 今日作息及食谱(8.20)
- 数据库性能优化之SQL语句优化
- jsp放在WEB-INF下的原因
- UVA 10280 - Old Wine Into New Bottles
- mysql管理 ------查看 MySQL 数据库中每个表占用的空间大小
- PCA(Principal Component Analysis)主成分分析