struts2的介绍及配置详解

<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>
	//将全部请求定位到指定的Struts 2过滤器中
	<url-pattern>/*</url-pattern>
</filter-mapping>

…
<h1>Hello World</h1>
<div>
	<h1>
		<!-- 显示Struts Action中message属性内容 -->
		${message}
	</h1>
</div>
<hr />
<div>
	<form action="helloWorld.action">
		请输入您的姓名：
		<input name="name" type="text" />
		<input type="submit" value="提交" />
	</form>
</div>
…

public class HelloWorldAction {	
	private String name = ""; // 用户输入的姓名
	private String message = ""; // 向用户显示的信息	
	/**
	 * 当Struts 2处理用户请求时，在默认配置下调用的方法
	 */
	public String execute() {
		// 根据用户输入的姓名，进行“Hello，XXXX！”的封装
		this.setMessage("Hello,"+this.getName()+"！");
		// 处理完毕，返回“helloWorld”
		return "helloWorld";
	}
	…	//省略setter、getter方法
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<package name="default" namespace="/" extends="struts-default">
		<action name="helloWorld" 
					class="com.strutsdemo.HelloWorldAction">	
			<result name="helloWorld">helloWorld.jsp</result>
		</action>
	</package>
</struts>

Document Type Definition 
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN""http://struts.apache.org/dtds/struts-2.1.7.dtd">
来自struts2-core-2.1.XXX.jar/struts-default.xml

…
<struts>
	<package name="default" namespace="/" extends="struts-default">
		<action name="login" class="com.hrent.action.LoginAction">
			<result name="success">/page/manage.jsp</result>
			<result name="input">/page/login.jsp</result>						<result name="error">/page/error.jsp</result>
		</action>
	</package>
</struts>

…
<struts>
	<package name="default" namespace="/" extends="struts-default">
		<action name="login" class="com.hrent.action.LoginAction">
			<result name="success">/page/manage.jsp</result>
			<result name="input">/page/login.jsp</result>						<result name="error">/page/error.jsp</result>
		</action>
	</package>
</struts>

<constant name="struts.action.extension" value="do,action" />   

<constant name="struts.serve.static.browserCache " value="false" />  

<constant name="struts.configuration.xml.reload" value="true" />

<constant name="struts.devMode" value="true" />   

<constant name="struts.ui.theme" value="simple" />   

public class UserAction implements Action {	
	  …	
	  public String login() {
		  …		
	  }
	public String register() {
		  …		
	  }
}

<action name="user" class="com.houserent.action.UserAction">
	  <result name="login">/page/manage.jsp</result>
	  <result name="register">/page/success.jsp</result>
	  <result name="login_input">/page/login.jsp</result>
	  <result name="register_input">/page/register.jsp</result>
	  <result name="error">/page/error.jsp</result>
</action>

<action name="login" 
	  class="com.houserent.action.UserAction" method="login">
	  <result>/page/manage.jsp</result>
	  <result name="input">/page/login.jsp</result>
	  <result name="error">/page/error.jsp</result>
</action>
<action name="register" 
	class="com.houserent.action.UserAction" method="register">
	  <result>/page/success.jsp</result>
	  <result name="input">/page/register.jsp</result>
	  <result name="error">/page/error.jsp</result>
</action>

<action name= "*User" 
		class="com.houserent.action.UserAction" method="{1}">
	  <result>/page/{1}_success.jsp</result>
	  <result name="input">/page/{1}.jsp</result>
	  <result name="error">/page/error.jsp</result>
</action>

<action name= “*_*" 
		class="com.houserent.action.{1}Action" method="{2}">
	  <result>/page/{1}_{2}_success.jsp</result>
</action>

public class UserAction extends ActionSupport {
	private String nextDispose;
	public String login() {
		...
		if(user.isManager()){
			nextDispose = "manager";
		}else{
			nextDispose = "common";
		}
		return  nextDispose;
	}
	public String getNextDispose(){
		return nextDispose;
	}
	...
}

<struts>
	<package name="default" extends="struts-default">
		<action name="login"
			class="com.houserent.action.UserAction" method="login">
			<result type="redirectAction">${nextDispose}</result>
			<result name="error">/page/error.jsp</result>
		</action>
		<action name="common"
			class="com.houserent.action.CommonUserAction">
			…
		</action>
		<action name="manage"
			class="com.houserent.action.ManagerAction">
			...
		</action>
	</package>
</struts>

<struts>	
	<default-action-ref name="defaultAction"/ >
	<package name="default" extends="struts-default">
		<global-results>
			<result name="error">/page/error.jsp</result>
			<result name="login" type="redirect">/page/login.jsp</result>
		</global-results>
		<action name="login" 
	class="com.houserent.action.UserAction" method="login">
	<result>/page/manage.jsp</result>
	<result name="input">/page/login.jsp</result>
	<result name="error">/page/error.jsp</result>
	</action>		
	…
	</package>
</struts>