使用Tomcat，@ WebFilter无法使用 <filter-mapping> 在web.xml里面

Question

这是一个有效的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>

     <filter>
        <filter-name>rememberMeCookieFilter</filter-name>
        <filter-class>be.example.fun.jsp.filters.RememberMeCookieFilter</filter-class>
    </filter>

    <filter>
        <filter-name>mustBeSignedInFilter</filter-name>
        <filter-class>be.example.fun.jsp.filters.MustBeSignedInFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>rememberMeCookieFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>mustBeSignedInFilter</filter-name>
        <url-pattern>/private/*</url-pattern>
    </filter-mapping>
</web-app>

当我删除<filter>元素并使用以下注释时：

@WebFilter(filterName="rememberMeCookieFilter")
public class RememberMeCookieFilter implements Filter

@WebFilter(filterName="mustBeSignedInFilter")
public class MustBeSignedInFilter implements Filter

然后Tomcat 7.0.14给我以下错误：

java.lang.IllegalArgumentException: Filter mapping must specify either a <url-pattern> or a <servlet-name>
    at org.apache.catalina.core.StandardContext.validateFilterMap(StandardContext.java:2956)
    at org.apache.catalina.core.StandardContext.addFilterMap(StandardContext.java:2915)
    at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1180)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270)
        ...

我按照这个问题的答案，但这对我不起作用。

以下是我的Web应用程序的依赖项：

<dependencies>
        <!-- SLF4J (+ LOGBack) for logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.4</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy</artifactId>
            <version>1.8.3</version>
        </dependency>

        <!-- The servlet API that I installed in my local repo -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>3.0</version>
            <type>jar</type>
            <scope>provided</scope>
            <!--optional>false</optional-->
        </dependency>

        <!-- JUnit for testing -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

编辑：我只在使用Tomcat（7.0.14）时遇到问题。 Glassfish很好。

Answer 1

这是Tomcat 7中的一个错误。我将其报告为问题53354 。

由于无法在@WebFilter指定调用顺序，因此用户必须在web.xml中显式指定<filter-mapping> 。 这与Glassfish和JBoss AS中的@WebFilter(filterName)结合使用，如下所示：

 @WebFilter(filterName="filter1") public class Filter1 implements Filter {} @WebFilter(filterName="filter2") public class Filter2 implements Filter {} 

同

 <filter-mapping> <filter-name>filter1</filter-name> <url-pattern>/url1/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>filter2</filter-name> <url-pattern>/url2/*</url-pattern> </filter-mapping> 

然而，它在Tomcat的7.0.27失败，出现以下混乱异常（在<url-pattern> 被设定）

 Caused by: java.lang.IllegalArgumentException: Filter mapping must specify either a <url-pattern> or a <servlet-name> at org.apache.catalina.core.StandardContext.validateFilterMap(StandardContext.java:3009) at org.apache.catalina.core.StandardContext.addFilterMap(StandardContext.java:2968) at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1207) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1294) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 7 more 

同时，您最好的选择是使用Glassfish或JBoss AS，或者通过<filter>注册过滤<filter> 。

Answer 2

您必须为Servlet过滤器指定目标。 为“servletNames”或“urlPatterns”提供值。

http://docs.oracle.com/javaee/6/api/javax/servlet/annotation/WebFilter.html

例如

@WebFilter(filterName="mustBeSignedInFilter", urlPatterns={ "/signed/in/path/*" })
public class MustBeSignedInFilter implements Filter