2012-04-03 16 views
-1

当学习使用struts编写基本应用程序时,我遇到了以下可正常工作的代码。整个事情是如何运作的?

的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"> 
<servlet> 
    <servlet-name>action</servlet-name> 
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> 
    <init-param> 
     <param-name>config</param-name> 
     <param-value>/WEB-INF/struts-config.xml</param-value> 
    </init-param> 
    <init-param> 
     <param-name>debug</param-name> 
     <param-value>2</param-value> 
    </init-param> 
    <init-param> 
     <param-name>detail</param-name> 
     <param-value>2</param-value> 
    </init-param> 
    <load-on-startup>2</load-on-startup> 
</servlet> 
<servlet-mapping> 
    <servlet-name>action</servlet-name> 
    <url-pattern>*.do</url-pattern> 
</servlet-mapping> 
<session-config> 
    <session-timeout> 
     30 
    </session-timeout> 
</session-config> 
<welcome-file-list> 
    <welcome-file>index.jsp</welcome-file> 
</welcome-file-list> 

的index.jsp

jsp:forward page="HelloWorld.do"/> 

的struts-config.xml

<struts-config> 

<form-beans> 
<form-bean name="HelloWorldActionForm" 

类型= “com.vaannila.HelloWorldActionForm”/>

<action-mappings> 
<action input="/index.jsp" name="HelloWorldActionForm" path="/HelloWorld" scope="session" type="com.vaannila.HelloWorldAction"> 
<forward name="success" path="/helloWorld.jsp" /> 
</action> 
</action-mappings> 

HelloWorldActionForm

public class HelloWorldActionForm extends 
org.apache.struts.action.ActionForm { 

private String message; 

public String getMessage() { 
    return message; 
} 

public void setMessage(String Message) { 
    message = Message; 
} 

} 

HelloWorldAction.java

public class HelloWorldAction extends org.apache.struts.action.Action { 

private final static String SUCCESS = "success"; 

public ActionForward execute(ActionMapping mapping,ActionForm form, 
HttpServletRequest request,HttpServletResponse response) throws Exception { 

HelloWorldActionForm helloWorldForm = (HelloWorldActionForm) form; 
helloWorldForm.setMessage("Hello World!"); 
return mapping.findForward(SUCCESS); 
} 
} 

的helloWorld.jsp

Hey ! It's me from struts. 

应用程序工作正常。但我不明白如何请求HelloWorld.do终于到达helloWorld.jsp后我打开index.jsp?我明白HelloWorldAction实际上返回页面的东西。

+1

下面是流程的流程:当你访问index.jsp时,请求被转发到H elloWorld.do(请参阅jsp:forward)。看到.do模式的应用程序服务器将请求传递给ActionServlet(请参阅:web.xml)。现在ActionServlet已经配置了struts-config.xml文件。配置文件有一个为/ HelloWorld定义的动作。因此,请求由HelloWorldAction处理,它返回'success'代码 - 它被映射到helloWorld.jsp(再次指向struts-config.xml),它是由ActionServlet'controller'返回的'view'。希望有所帮助。 – ben 2012-04-03 19:06:28

+1

你应该把它作为答案:) – 2012-04-03 19:07:31

+0

http://struts.apache.org/2.0.6/docs/the-struts-2-request-flow.html – ben 2012-04-03 19:07:43

回答

0

当您HelloWorldAction.execute回报率(有效的字符串)“成功”

THEN

<forward name="success" path="/helloWorld.jsp" /> 

比赛“成功”,并提供“/helloWorld.jsp”

+0

在标签中''_name_属性告诉了什么? – 2012-04-04 04:07:49

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