java - 使用 Tomcat，@WebFilter 不适用于 web.xml 中的

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>元素并改用以下注释:

@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this question的回答做了，但这对我不起作用。

这是我的网络应用程序的依赖项:

<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 issue 53354 .

As it's not possible to specify the invocation order in a @WebFilter, users are forced to explicitly specify <filter-mapping> in web.xml. This works in combination with a @WebFilter(filterName) in Glassfish and JBoss AS as follows:

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

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

with

<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>

However it fails in Tomcat 7.0.27 with the following confusing exception (the <url-pattern> is been set)

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

与此同时，您最好的选择是改用 Glassfish 或 JBoss AS，或者通过 <filter> 注册过滤器。无论如何。