一个简单的 Struts 例子

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其实这个例子也是抄李刚《轻量级JavaEE企业应用实战》里的，学习中

1. 创建一个web project, 比如: Struts2Demo

2. 写三个jsp,分别代表login, login正确，login错误.

(2.1) index.jsp

<%@ page contentType="text/html; charset=gb2312" language="java" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@ taglib prefix="s" uri="/struts-tags" %><html> <head><title><s:text name="loginPage" /></title> </head> <body> <s:form action="login"> <s:textfield name="username" key="user" /> <s:password name="password" key=pass" /> <s:submit key="login" /> </s:form> </body></html>

(2.2) error.jsp

<%@ page contentType="text/html; charset=gb2312" language="java" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@ taglib prefix="s" uri="/struts-tags" %><html> <head><title><s:text name="errorPage" /></title> </head> <body> <s:text name="failTip" /> </body></html>

(2.3) welcome.jsp

<%@ page contentType="text/html; charset=gb2312" language="java" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@ taglib prefix="s" uri="/struts-tags" %><html> <head><title><s:text name="succPage" /></title> </head> <body> <s:text name="succTip"> <s:param>${sessionScope.user}</s:param> </s:text> </body></html>

3. 在src文件夹建立两个properties文件，messageResource_zh_CN.properties和messageResource.properties, 实现中文化

(3.1) messageResource_zh_CN.properties

loginPage=登陆页面errorPage=错误页面succPage=成功页面failTip=对不起，您不能登录！succTip=欢迎，${0},您已经登录！user=用户名pass=密码login=登陆

(3.2) messageResource.properties

loginPage=/u767b/u9646/u9875/u9762errorPage=/u9519/u8bef/u9875/u9762succPage=/u6210/u529f/u9875/u9762failTip=/u5bf9/u4e0d/u8d77/uff0c/u60a8/u4e0d/u80fd/u767b/u5f55/uff01succTip=/u6b22/u8fce/uff0c{0},/u60a8/u5df2/u7ecf/u767b/u5f55/uff01user=/u7528/u6237/u540dpass=/u5bc6 /u7801login=/u767b/u9646user.required=/u7528/u6237/u540d/u5fc5/u987b/u8f93/u5165/uff01pass.required=/u5bc6/u7801/u5fc5/u987b/u8f93/u5165/uff01

4. 在web.xml文件中定义Servlet或filter拦截用户请求

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" 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_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <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>

5. 定义处理用户请求的Action类

package stone;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class loginAction extends ActionSupport {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;}private String username;private String password;public String execute()throws Exception{if(getUsername().equals("s") && getPassword().equals("s")){ActionContext.getContext().getSession().put("user", getUsername());return SUCCESS;}elsereturn ERROR;}}

6. 配置Action, 也就是配置src下的 struts.xml文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><constant name="struts.custom.i18n.resources" value="messageResource" /><constant name="struts.i18n.encoding" value="GBK" /><package name="stone" extends="struts-default"><action name="login" class="stone.loginAction"><result name="input">/login.jsp</result><result name="error">/error.jsp</result><result name="success">/welcome.jsp</result></action></package></struts>