package?org.lxh.filterdemo?; import?java.io.*?; import?javax.servlet.*?; public?class?SimpleFilter?implements?Filter?{ public?void?init(FilterConfig?config) ??????????throws?ServletException{ //?接收初始化的參數(shù) String?initParam?=?config.getInitParameter("ref")?; System.out.println("**?過濾器初始化，初始化參數(shù)="?+?initParam)?; } public?void?doFilter(ServletRequest?request, ??????????????ServletResponse?response, ??????????????FilterChain?chain) ??????????????throws?IOException, ?????????????????????ServletException{ System.out.println("**?執(zhí)行doFilter()方法之前")?; chain.doFilter(request,response)?; System.out.println("**?執(zhí)行doFilter()方法之后")?; } public?void?destroy(){ System.out.println("**?過濾器銷毀。")?; } }上面是我的java代碼web.xml文件配置如下<filter>? <filter-name>simple</filter-name>? <filter-class>org.lxh.filterdemo.SimpleFilter</filter-class>? <init-param>? <param-name>ref</param-name>? <param-value>你好，客舍青青</param-value>? </init-param>? </filter>? <filter-mapping>? <filter-name>simple</filter-name>? <url-pattern>/chapter/SimpleFilter</url-pattern>? </filter-mapping>Tomcat服務(wù)器運行如下二月 12, 2017 12:12:26 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:MLDN' did not find a matching property.二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Server version: ? ? ? ?Apache Tomcat/7.0.67二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Server built: ? ? ? ? ?Dec 7 2015 13:07:11 UTC二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Server number: ? ? ? ? 7.0.67.0二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: OS Name: ? ? ? ? ? ? ? Windows 7二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: OS Version: ? ? ? ? ? ?6.1二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Architecture: ? ? ? ? ?amd64二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Java Home: ? ? ? ? ? ? C:\Program Files\Java\jre1.8.0_65二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: JVM Version: ? ? ? ? ? 1.8.0_65-b17二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: JVM Vendor: ? ? ? ? ? ?Oracle Corporation二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: CATALINA_BASE: ? ? ? ? D:\ECLIPSE\.metadata\.plugins\org.eclipse.wst.server.core\tmp2二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: CATALINA_HOME: ? ? ? ? C:\Program Files\apache-tomcat-7.0.67-windows-x64\apache-tomcat-7.0.67二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:11231二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -Dcatalina.base=D:\ECLIPSE\.metadata\.plugins\org.eclipse.wst.server.core\tmp2二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -Dcatalina.home=C:\Program Files\apache-tomcat-7.0.67-windows-x64\apache-tomcat-7.0.67二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -Dwtp.deploy=D:\ECLIPSE\.metadata\.plugins\org.eclipse.wst.server.core\tmp2\wtpwebapps二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -Djava.endorsed.dirs=C:\Program Files\apache-tomcat-7.0.67-windows-x64\apache-tomcat-7.0.67\endorsed二月 12, 2017 12:12:27 下午 org.apache.catalina.startup.VersionLoggerListener log信息: Command line argument: -Dfile.encoding=GBK二月 12, 2017 12:12:27 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.8.0_65\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_65/bin/server;C:/Program Files/Java/jre1.8.0_65/bin;C:/Program Files/Java/jre1.8.0_65/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Java\jdk1.8.0_65\bin;C:\Program Files\Java\jdk1.8.0_65\jre\bin;C:\Program Files\Java\jdk1.8.0_65\bin;E:\Mysql2\100\Tools\Binn\;E:\Mysql\100\Tools\Binn\;E:\Mysql\100\DTS\Binn\;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;D:\Program Files (x86)\MySQL\MySQL Server 5.0\bin;D:\360安全瀏覽器下載\eclipse-jee-mars-1-win32-x86_64\eclipse;;.二月 12, 2017 12:12:28 下午 org.apache.coyote.AbstractProtocol init信息: Initializing ProtocolHandler ["http-bio-8080"]二月 12, 2017 12:12:28 下午 org.apache.coyote.AbstractProtocol init信息: Initializing ProtocolHandler ["ajp-bio-8007"]二月 12, 2017 12:12:28 下午 org.apache.catalina.startup.Catalina load信息: Initialization processed in 3625 ms二月 12, 2017 12:12:28 下午 org.apache.catalina.core.StandardService startInternal信息: Starting service Catalina二月 12, 2017 12:12:28 下午 org.apache.catalina.core.StandardEngine startInternal信息: Starting Servlet Engine: Apache Tomcat/7.0.67二月 12, 2017 12:12:29 下午 org.apache.catalina.startup.TldConfig execute信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.二月 12, 2017 12:12:30 下午 org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom信息: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [466] milliseconds.二月 12, 2017 12:12:31 下午 org.apache.catalina.startup.TldConfig execute信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.** 過濾器初始化，初始化參數(shù)=你好，客舍青青二月 12, 2017 12:12:31 下午 org.apache.coyote.AbstractProtocol start信息: Starting ProtocolHandler ["http-bio-8080"]二月 12, 2017 12:12:31 下午 org.apache.coyote.AbstractProtocol start信息: Starting ProtocolHandler ["ajp-bio-8007"]二月 12, 2017 12:12:31 下午 org.apache.catalina.startup.Catalina start信息: Server startup in 2936 ms然后出錯頁面如下大神請指示！