struts2入门（1）----HelloWorld
struts2入门（1）------- HelloWorld
1）导入struts2的包：
???? commons-logging-1.0.4.jar
???? freemarker-2.3.15.jar
???? ognl-2.7.3.jar
???? struts2-core-2.1.8.1.jar
???? xwork-core-2.1.6.jar
???? commons-fileupload-1.2.1.jar（struts2.1.6以后须导入的包，不然会出现Unable to load configuration. -
?????? bean -?? jar:file:/D:/java/tomcat6/webapps/HelloWord/WEB-INF/lib/struts2-core-2.1.8.1.jar!/struts-
????????? default.xml:47:178）
2）web.XML中添加struts2。
??? <filter>
??? ??? <filter-name>struts2</filter-name>
??? ??? <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
??? </filter>???
??? <filter-mapping>
??? ??? <filter-name>struts2</filter-name>
??? ??? <url-pattern>/*</url-pattern>
??? </filter-mapping>
3）编写struts.xml文件放到src下：
??? <!DOCTYPE struts PUBLIC
??????? "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
??????? "http://struts.apache.org/dtds/struts-2.0.dtd">
???? <struts>
??? <include file="struts-default.xml" />
??? <package name="struts2" extends="struts-default">
??? ??? <action name="HelloWorld" + name;
??? ??? return SUCCESS;
??? }
}
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5)编写输入用户名的input.jsp页面：
??????? <%@ taglib prefix="s" uri="/struts-tags"%>
??? ??? <s:form action="HelloWorld">
??? ??? ??? Name: <s:textfield name="name" />
??? ??? ??? <s:submit />
??? ??? </s:form>
6）编写接收用户输入的jsp：helloworld.jsp
??????? <s:property value="name"/>//显示出：*******************+name
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注意事项：确保struts.xml的正确：放到src下。如出现There is no Action mapped for action name HelloWorld。则一般为文件配置不正确，
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在struts.xml中，如果在package中定义了命名空间，如namespace="/com/action"，那么在浏览器中url就必须带package的信息，如
?????? http://localhost:8080/Struts2Demo/com/action/HelloWorld.action
?????? 如果没有定义namespace,则http://localhost:8080/Struts2Demo/com/action/HelloWorld.action和????????????????????????????????????????????????????????????http://localhost:8080/Struts2Demo/HelloWorld.action
都可以的
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