第一個Struts2的例子

文檔結構

[img]http://dl.iteye.com/upload/attachment/150420/4aaf352e-0c0c-3a40-9d13-695e0053133b.png[/img]

lib文件夾

[img]http://dl.iteye.com/upload/attachment/150424/a950be21-b5e2-33a2-97ac-71f4e57144aa.png[/img]

struts.xml

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="tutorial" extends="struts-default">
        <action name="HelloWorld" class="tutorial.HelloWorld">
            <result>/HelloWorld.jsp</result>
        </action>
        <!-- Add your actions here -->
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" 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>Struts2Demo</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>

HelloWorld.java

package tutorial;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorld extends ActionSupport {

	private static final long serialVersionUID = 1L;

	public static final String MESSAGE = "Struts is up and running ...";

    public String execute() throws Exception {
    	System.out.println("in execute");
        setMessage(MESSAGE);
        System.out.println(SUCCESS);
        return SUCCESS;
    }

    private String message;

    public void setMessage(String message){
        this.message = message;
    }

    public String getMessage() {
        return message;
    }
}

使用JUnit進行測試：
HelloWorldTest.java

package tutorial;

import junit.framework.TestCase;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldTest extends TestCase {
	public void testHelloWorld() throws Exception {

		HelloWorld hello_world = new HelloWorld();
		String result = hello_world.execute();

		assertTrue("Expected a success result!", ActionSupport.SUCCESS
				.equals(result));

		assertTrue("Expected the default message!", HelloWorld.MESSAGE
				.equals(hello_world.getMessage()));

	}
}

在瀏覽器中測試：
瀏覽器中輸入URL
[img]http://dl.iteye.com/upload/attachment/150428/c035a966-c859-3e16-bf45-e5a3c61dc286.png[/img]
頁面效果
[img]http://dl.iteye.com/upload/attachment/150430/66ab146f-8c89-3877-8721-0ef1d4960544.png[/img]