Struts2的There is not Action mapped for namespace [/] 错误

最新推荐文章于 2020-12-01 17:10:07 发布

原创最新推荐文章于 2020-12-01 17:10:07 发布 · 867 阅读

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#struts #错误 #namespace

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本文揭示了一个关于Struts2框架使用中的常见错误：若要利用Struts2的注解特性，则必须确保action类位于特定命名的包内。文章通过实例详细介绍了这一配置要求及其解决办法。

错误原因让人啼笑皆非……重点内容**

There is no Action mapped for namespace [/] and action name [test] associated with context path [/test]. - [unknown location]  
    at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)  
    at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)  
    at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)  
    at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)  
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:501)  
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)  
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)  
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)  
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)  
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)  
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)  
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)  
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)  
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)  
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)  
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)  
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)  
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1805)  
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)  
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)  
    at java.lang.Thread.run(Thread.java:722)

web.xml

<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="3.0" 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">  
    <display-name>test-struts</display-name>  
    <filter>  
        <filter-name>struts2</filter-name>  
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>struts2</filter-name>  
        <url-pattern>*.action</url-pattern>  
    </filter-mapping>  
    <welcome-file-list>  
        <welcome-file>index.jsp</welcome-file>  
    </welcome-file-list>  
</web-app>

TestAction.java

package com.test.Action;  

import org.apache.struts2.convention.annotation.Action;  
import org.apache.struts2.convention.annotation.Result;  
import org.apache.struts2.convention.annotation.Results;  

import com.opensymphony.xwork2.ActionSupport;  

@Results(value = { @Result(name = "success", location = "/result.jsp") })  
public class TestAction extends ActionSupport {  

    private String name;  
    /** 
     *  
     */  
    private static final long serialVersionUID = 1L;  

    @Action("test")  
    public String test() {  
        name = "qqqqqqq";  
        return SUCCESS;  
    }  

    public String getName() {  
        return name;  
    }  

    public void setName(String name) {  
        this.name = name;  
    }  

}

乍一看，是没有任何问题的！可是只要一运行就报错！
以下是Struts2的原文文档：
First the Convention plugin finds packages named struts, struts2, action or actions. Any packages that match those names are considered the root packages for the Convention plugin. Next, the plugin looks at all of the classes in those packages as well as sub-packages and determines if the classes implementcom.opensymphony.xwork2.Action or if their name ends with Action (i.e. FooAction).

注意我加粗倾斜标记的内容，也就是说，如果要用Struts2的注解，你还非得将action处理类放在struts, struts2, action, actions包或者其子包中。
碰到了同样的问题，以前确实不知道基于注解的 struts 配置需要将action类放在名字为 action 的package下。