使用Tomcat时，@WebFilter不能在web.xml的<filter-mapping>内工作

Question

使用Tomcat时，@WebFilter不能在web.xml的<filter-mapping>内工作

9

以下是一个可用的web.xml文件：

<?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>

当我移除了<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会给我以下错误提示：

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做了，但对我没有用。

这是我的Web应用程序的依赖关系：

<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：只有在使用Tomcat（7.0.14）时我才会遇到这个问题。Glassfish没有问题。

- AndrewBourgeois

你可以尝试使用最新版本的Tomcat 7吗？当前版本是7.0.27。 - Christopher Schultz

2个回答

2

您必须为Servlet过滤器指定一个目标。可以为'servletNames'或'urlPatterns'提供值。

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

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

- Pidster

我只是从我的web.xml文件中删除了<filter>元素，而不是<filter-mapping>元素。正如在以下问题中回答的那样，它应该可以工作：https://dev59.com/wmw15IYBdhLWcg3whME1。仅当我在Glassfish环境中部署它时才起作用。 - AndrewBourgeois

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- BalusC · Accepted Answer

这是Tomcat 7的一个bug。我已经报告了问题53354。

由于无法在@WebFilter中指定调用顺序，因此用户被强制在web.xml中显式指定<filter-mapping>。在Glassfish和JBoss AS中，与@WebFilter(filterName)组合使用如下：

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

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

使用

<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>

然而在Tomcat 7.0.27上它会失败，并抛出以下令人困惑的异常（<url-pattern>已经被设置）

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，您最好使用Glassfish或JBoss AS，或者通过