在Eclipse中配置Struts2

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在Eclipse中配置Struts2
下面介绍在Eclipse中配置Struts2的过程：

一、下载Struts2，因为Struts2是开源的，百度或者google一下就可以找到下载地址。我下载的是struts-2.3.1.2版本的，解压之后入下图：

apps目录：Struts2的范例

docs目录：Struts2的文档

lib目录：Struts2的类库

src目录：关于Struts2的一些资源

二、现在是利用apps中的范例实现一个helloworld的action，在apps目录下有几个war文件，如下图：

这几个文件可以用WinRAR打开，我用好压打开struts2-blank.war之后，如下图

在WEB-INF目录下打开classes目录，找到struts.xml文件，如下图

将struts.xml文件复制到Eclipse新建工程的src目录下，在我的工程中如下图：

三、如上面所示，在WEB-INF目录下打开lib目录，如下图：

打开之后会有如上图的jar包，为保险起见，将所有的jar包复制到新建工程的lib目录下，在我的工程中如下图：

四、返回到WEB-INF目录下，找到web.xml文件并打开，打开之后会看到有如下代码：

Xml代码

<?xml version="1.0" encoding="UTF-8"?>

<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">



    <display-name>Struts Blank</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>/*</url-pattern>

    </filter-mapping>



    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

    </welcome-file-list>



</web-app>

<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Struts Blank</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>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app>

将其中<filter></filter>和<filter-mapping></filter-mapping>元素复制到Eclipse新建工程的web.xml文件中，我的web.xml文件如下所示：

Xml代码

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <display-name>Structs0317</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

   <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>/*</url-pattern>

    </filter-mapping>

</web-app>

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Structs0317</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <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>/*</url-pattern> </filter-mapping> </web-app>

五、在Eclipse中打开复制来的struts.xml文件，将文件中<struts>和</struts>之间的内容注释掉，并添加如下所示的代码：

Xml代码

<package name="default" namespace="/" extends="struts-default">



        <action name="hello">

            <result>

                /Hello.jsp

            </result>

        </action>

    </package>

<package name="default" namespace="/" extends="struts-default"> <action name="hello"> <result> /Hello.jsp </result> </action> </package>

六、在Ecplise中新建一个Hello.jsp文件，在<body>标签之间写如下代码：



Java代码

Hello Struts2<br>

Hello Struts2<br>

然后启动Tomcat服务器，在IE浏览器中输入http://localhost:8080/Structs0317会发现出现如下错误：

Java代码

There is no Action mapped for namespace [/] and action name [] associated with context path [/Structs0317]. - [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:500)

    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:235)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)

    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)

    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

    at java.lang.Thread.run(Unknown Source)

There is no Action mapped for namespace [/] and action name [] associated with context path [/Structs0317]. - [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:500) 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:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source)

其实正确的输入是http://localhost:8080/Structs0317/hello或者http://localhost:8080/Structs0317/hello.action 访问到的Hello.jsp如下图所示：

OK，至此所有的配置都配置好了，接下来就可以好好的去玩Struts2了。在这里还想再谈一点感受就是，遇到新的东西首先是先拿去用，等会用了在好好研究它的原理和细枝末节，就像别人给你一把枪一样，你不会一拿到枪就把它拆开来研究它的内部构造，而是直接拿去用，会用了，觉得这东西有意思了，再好好去研究的内部结构甚至是仿制出一把出来。这也是我以前所没有意识到的，希望今后改进，好好学习，天天向上。
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原文地址：https://www.cnblogs.com/hpuCode/p/2588305.html