package org.lxh.filterdemo ;
import java.io.* ;
import javax.servlet.* ;
public class SimpleFilter implements Filter {
public void init(FilterConfig config)
throws ServletException{
// 接收初始化的参数
String initParam = config.getInitParameter("ref") ;
System.out.println("** 过滤器初始化，初始化参数=" + initParam) ;
}
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException,
ServletException{
System.out.println("** 执行doFilter()方法之前") ;
chain.doFilter(request,response) ;
System.out.println("** 执行doFilter()方法之后") ;
}
public void destroy(){
System.out.println("** 过滤器销毁。") ;
}
}上面是我的java代码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服务器运行如下二月 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安全浏览器下载\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.** 过滤器初始化，初始化参数=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然后出错页面如下大神请指示！
3 回答
按照自己的节奏前行
TA贡献90条经验 获得超70个赞
<filter-mapping> <filter-name>simple</filter-name> <url-pattern>/chapter/SimpleFilter</url-pattern> </filter-mapping> <!--亲,这个是你要过滤的路径,不是访问的路径哦,你用的是过滤器,你要闻为什麽,嗯tomcat这么规定的 你要访问路径还是要用servlet来配置,哦,也许你会问会啥这样,人家源码就这样写的,你不服? -->
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