action標(biāo)記允許程序員從視圖頁面執(zhí)行動作。他們可以做到這一點(diǎn)通過指定的動作名稱。他們可以設(shè)置的“executeResult”參數(shù)設(shè)置為“true”,在視圖中直接呈現(xiàn)結(jié)果。或者他們可以將此參數(shù)設(shè)置為“false”,但利用請求屬性暴露的操作方法。
package com.yiibai.struts2; public class HelloWorldAction{ private String name; public String execute() throws Exception { return "success"; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
讓我們具有 helloWorld.jsp 展示使用generator 標(biāo)記:
<%@ page contentType="text/html; charset=UTF-8" %> <%@ taglib prefix="s" uri="/struts-tags" %> <html> <head> <title>Hello World</title> </head> <body> <h2>Example of Generator Tag</h2> <h3>The colours of rainbow:</h3> <s:generator val="%{'Violet,Indigo,Blue, Green,Yellow,Orange,Red '}" count="7" separator=","> <s:iterator> <s:property /><br/> </s:iterator> </s:generator> </body> </html>
接下來讓我們有employees.jsp包含以下內(nèi)容:
<%@ page contentType="text/html; charset=UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <html> <head> <title>Employees</title> </head> <body> <s:action name="hello" executeResult="true"> Output from Hello: <br /> </s:action> </body> </html>
struts.xml 應(yīng)該像這樣:
<?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> <constant name="struts.devMode" value="true" /> <package name="helloworld" extends="struts-default"> <action name="hello" class="com.yiibai.struts2.HelloWorldAction" method="execute"> <result name="success">/HelloWorld.jsp</result> </action> <action name="employee" class="com.yiibai.struts2.Employee" method="execute"> <result name="success">/employee.jsp</result> </action> </package> </struts>
web.xml 應(yīng)該像這樣:
<?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_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>Struts 2</display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <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> </web-app>
右鍵點(diǎn)擊項(xiàng)目名稱,并單擊 Export > WAR File 創(chuàng)建一個(gè)WAR文件。然后部署此WAR在Tomcat的webapps目錄下。最后,啟動Tomcat服務(wù)器和嘗試訪問URL http://localhost:8080/HelloWorldStruts2/employee.action。這會給出以下畫面:
正如可以看到在這個(gè)例子中,我們指定為“true”的值executeResult。因此,hello.action結(jié)果是直接在網(wǎng)頁上呈現(xiàn)。helloWorld.jsp打印彩虹的顏色 - 這是現(xiàn)在employee.jsp呈現(xiàn)
現(xiàn)在,讓我們稍微修改 HelloWorldAction.java:
package com.yiibai.struts2; import java.util.ArrayList; import java.util.List; 上一篇:Struts 2 Hello World (注解版本)下一篇:Chinese 本地化問題