尚filter过滤器王-课堂笔记

要求：在你的web工程下，有一个admin 。这个admin 下的所有资源（html页面、jpg、jsp文件、等等）都必登录，可以判断Session中否包含有用户登录的信息即可！！！ Objectuser= if(user==null) publicclasspublicclassAdminFilterimplementsFilter filterChain)throwsIOException,ServletException{HttpServletRequesthttpServletRequest=(HttpServletRequest)HttpSessionsession=httpServletRequest.getSession();Objectuser=session.getAttribute("user");if(user==null)}else }}} > "用户名：<inputtype="text"name="username"密码：<inputtype="password"name="password"<inputtype="submit"publicpublicclassLoginServletextends{protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{Stringusername=req.getParameter("username");Stringpassword=req.getParameter("password");if("wzg168".equals(username)&&resp.getWriter().write("登录成功！！！");}else}}}4、FilterConfigpublicvoidinit(FilterConfigfilterConfig)throwsSystem.out.println("2.Filterinit(FilterConfigfilterConfig)+System.out.println("初始化参数url的值是："+filterConfig.getInitParameter("url")); 5、FilterChain 1、使用Filter过滤器/pages/manager/所有内容，实publicpublicclassManagerFilterimplementsFilterpublicvoidinit(FilterConfigfilterConfig)throwsServletException}filterChain)throwsIOException,ServletException{HttpServletRequesthttpServletRequest=(HttpServletRequest)servletRequest;Objectuser=httpServletRequest.getSession().getAttribute("user");if(user==null)}else}}publicvoiddestroy()}}>>2、每一个ThreadLocalpublicpublicclassOrderServicepublicvoidStringname=Thread.currentThread().getName();System.out.println("OrderService当前线程name"]中保存的数据是：+newpublicclassOrderDaopublicvoidStringname=System.out.println("OrderDao当前线程name"]中保存的数据是：+publicclassThreadLocalTest publicstaticMap<String,Object>data=newpublicstaticThreadLocal<Object>threadLocal=newprivatestaticRandomrandom=newpublicpublicstaticclassTaskimplements{publicvoidrun()Integeri=Stringname=Thread.currentThread().getName();System.out.println("线程["+name+"]生成的随机数是：i); {;}catch(InterruptedException{}newObjecto=Objecto= }}publicstaticvoidmain(String[]args)for(inti=0;i<3;newThread(new}}publicpublicclassJdbcUtilsprivatestaticDruidDataSourceprivatestaticThreadLocal<Connection>conns=newstatictryPropertiesproperties=new InputStreaminputStream=dataSource=(DruidDataSource)}catch(Exception{publicstaticConnectiongetConnection(){Connectionconn=if(conn==null)tryconn=dataSource.getConnection();//}catch(SQLException{}}return}publicstaticcommitAndClose(){Connectionconnectiontry}catch(SQLException{}finallytry}catch(SQLException{}}}}publicstaticrollbackAndClose(){Connection=try}catch(SQLException{}finallytry}catch(SQLException{@parampublicstaticvoidclose(Connectionconn){if(conn!=null){{;}catch(SQLException{}classBaseDaoprivateQueryRunnerqueryRunner=newpublicintupdate(Stringsql,Object...args)System.out.println(BaseDao程序在+Thread.currentThread().getName()"]中Connectionconnection=tryreturnqueryRunner.update(connection,sql,}catch(SQLException{thrownew*public<T>TqueryForOne(Class<T>type,Stringsql,Object...{Connectioncon=tryreturnqueryRunner.query(con,sql,newBeanHandler<T>(type),}catch(SQLException{thrownew}}public<T>List<T>queryForList(Class<T>type,Stringsql,Object...{Connectioncon=tryreturnqueryRunner.query(con,sql,newBeanListHandler<T>(type),}catch(SQLException{thrownew}}@param publicObjectqueryForSingleValue(Stringsql,Object...args){Connectionconn=JdbcUtils.getConnection();tryreturnqueryRunner.query(conn,sql,newScalarHandler(),}}catch(SQLException{thrownewpublicpublicclassTransactionFilterimplementsFilterfilterChain)throwsIOException,ServletException{ }catch(Exception> classBaseServletextendsHttpServletprotectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServlet