Struts2基本程序演示

Struts2启动配置

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
          version="3.1">
     <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>
 </web-app>

Struts2主配置文件

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
     "http://struts.apache.org/dtds/struts-2.3.dtd">

 <struts>

     <constant name="struts.enable.DynamicMethodInvocation" value="false" />
     <constant name="struts.devMode" value="true" />
     <!--默认就是UTF-8 所以不配置也行-->
     <!--<constant name="struts.i18n.encoding" value="UTF-8"/>-->

     <package name="default" namespace="/" extends="struts-default">
         <action name="index">
             <result>/WEB-INF/main.jsp</result>
         </action>
     </package>

     <!--struts2qs模块-->
     <include file="org/zln/struts2qs/cfg/struts2_struts2qs.xml"/>

 </struts>

Struts2模块文件配置

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE struts PUBLIC
     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
     "http://struts.apache.org/dtds/struts-2.3.dtd">

 <struts>

     <!--国际化资源-->
     <constant name="struts.custom.i18n.resources" value="org/zln/struts2qs/resource/messageResource"/>

     <!--struts2qs模块-->
     <package name="struts2qs" namespace="/struts2qs" extends="struts-default">
         <!--登录界面-->
         <action name="loginUI" class="org.zln.struts2qs.action.LoginAction" method="loginUI">
             <result name="success">/WEB-INF/struts2qs/loginForm.jsp</result>
         </action>
         <!--登录动作-->
         <action name="loginDo" class="org.zln.struts2qs.action.LoginAction" method="loginDo">
             <result name="success">/WEB-INF/struts2qs/welcome.jsp</result>
             <result name="input">/WEB-INF/struts2qs/loginForm.jsp</result>
         </action>
         <!--获取书籍-->
         <action name="getBooks" class="org.zln.struts2qs.action.BookAction" method="getBook">
             <result name="success">/WEB-INF/struts2qs/showBooks.jsp</result>
             <result name="login">/WEB-INF/struts2qs/loginForm.jsp</result>
         </action>
     </package>

 </struts>

Action

 package org.zln.struts2qs.action;

 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 import org.apache.commons.lang3.StringUtils;

 /**
  * Created by sherry on 15-7-8.
  */
 public class LoginAction extends ActionSupport {
     private String username;
     private String password;

     //登录界面
     public String loginUI(){
         return SUCCESS;
     }
     //登录动作
     public String loginDo(){
         System.out.println("获取参数：" + username + ":" + password);
         if ("zln".equals(username)
                 &&"123".equals(password)){
             ActionContext.getContext().getSession().put("user",username);
             return SUCCESS;
         }else {
             return INPUT;
         }
     }

     //输入校验

     //所有方法的输入校验
     @Override
     public void validate() {
         super.validate();
     }

     //指定方法的输入校验
     public void validateLoginDo(){
         if (StringUtils.isEmpty(username)){
             //对错误信息进行了国际化 也可以直接用文字
             addFieldError("username",getText("username.required"));
         }
     }

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }
 }

 /*
 Action访问Servlet API
 间接访问
      static ActionContext     getContext()
 直接访问
 * */

 package org.zln.struts2qs.action;

 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 import org.zln.struts2qs.service.BookService;

 /**
  * Created by sherry on 15-7-8.
  */
 public class BookAction extends ActionSupport {
     private String[] books;

     public String getBook(){
         String user = (String) ActionContext.getContext().getSession().get("user");
         if ("zln".equals(user)){
             //实际开发中会从容器中获取依赖对象
             BookService bookService = new BookService();
             books = bookService.getLeeBooks();
             return SUCCESS;
         }else {
             return LOGIN;
         }
     }

     public String[] getBooks() {
         return books;
     }

     public void setBooks(String[] books) {
         this.books = books;
     }
 }

jsp页面

 <%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
 <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
 <%@ taglib prefix="s" uri="/struts-tags" %>
 <%
     String home = request.getContextPath();
 %>
 <html>
 <head>
     <%--s:text标签输出国际化信息--%>
     <title><s:text name="loginPage"/></title>
 </head>
 <body>
     <form action="<%=home%>/struts2qs/loginDo.action" method="post">
         <table>
             <caption>用户登录</caption>
             <tr>
                 <td>用户名：</td>
                 <td><input type="text" name="username" /></td>
             </tr>
             <tr>
                 <td>密 码：</td>
                 <td><input type="password" name="password" /> </td>
             </tr>
             <tr>
                 <td colspan="2">
                     <input type="submit" value="提交"/>
                     <input type="reset" value="重置" />
                 </td>
             </tr>
         </table>
     </form>
     <hr/>
     <%--使用Struts2标签 默认提供表单输出提示--%>
     <s:form namespace="/struts2qs" action="loginDo" method="POST">
         <%--使用标签的 key 输出国际化信息--%>
         <s:textfield name="username" key="username"/>
         <s:password name="password" label="密  码"/>
         <s:submit value="提交"></s:submit>
     </s:form>
 </body>
 </html>

 <%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
 <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
 <%@ taglib prefix="s" uri="/struts-tags" %>
 <%
     String home = request.getContextPath();
 %>
 <html>
 <head>
     <%--使用表达式输出国际化信息--%>
     <title><s:property value="%{getText('succPage')}"/> </title>
 </head>
 <body>
     欢迎，${sessionScope.user}，您已经登录！<br/>
     <a href="<%=home%>/struts2qs/getBooks.action">获取书籍列表</a>
 </body>
 </html>

 <%@ page import="com.opensymphony.xwork2.util.ValueStack" %>
 <%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %>
 <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
 <%@ taglib prefix="s" uri="/struts-tags" %>
 <html>
 <head>
     <title>书籍</title>
 </head>
 <body>
     <table border="1" width="360">
         <%
             /*Struts2的所有属性参数被封装在此*/
             ValueStack valueStack = (ValueStack) request.getAttribute("struts.valueStack");
             String[] books = (String[]) valueStack.findValue("books");
             for (String book:books){
                 %>
                 <tr>
                     <td>书名：</td>
                     <td><%=book%></td>
                 </tr>
         <%
             }
         %>
     </table>
     <hr/>
     <table border="1" width="360">
         <caption>书籍</caption>
         <s:iterator value="books" status="index">
             <s:if test="#index.odd == true">
                 <tr style="background-color: aqua">
             </s:if>
             <s:else>
                 <tr>
             </s:else>
                     <td>书名：</td>
                     <td><s:property/></td>
                 </tr>
         </s:iterator>
     </table>
     <hr/>
     <a href="${pageContext.request.contextPath}/index.action">返回首页</a>
 </body>
 </html>

Action访问Servlet API的方法