在前一篇文章中，我們詳細的介紹了Struts 1.1 的工作原理，接著將會介紹它的安裝，以及一個具體的應用。
1. Struts 1.1 安裝
安裝Struts 1.1 比較簡單。假設我們使用的是Tomcat 5.0,並且安裝在D: omcat下。首先，請到http://jakarta.apache.org/struts/ 下載Struts 1.1,解壓縮後，可以看到jakarta-struts-1.1目錄，在這個目錄下面，你可以看到這樣一個目錄：webapps.該目錄下面有多個*.war，我們copy struts-blank.war 文件到D: omcatwebapps下，restart Tomcat，在Tomcat 的webapps下就會生成一個struts-blank空白Struts開發環境。另外，在你解壓縮的目錄下的webapps中 struts-example.war 是一個很好的struts學習教程，如果你想深入學習請訪問http://jakarta.apache.org/struts 或者 下載 《Struts in Action》 E 文版。
2. 一個簡單的例子
2.1 Logon.jsp
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=gb2312" %>
<%
/**
* This page shows Logon interface.
* Title: LOGON SYSTEM
* Description: Logon Page
* Copyright: Copyright (c) 2004
* Company: www.ewe.com.cn
* @author bluesunny <hyjun2001@163.com>
* @version 1.0
*/
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
%>
<html>
<head>
<title>Logon</title>
</head>
<body>
<html:errors/>
<html:form action="/Logon" focus="username">
username:<html:text property="username" size="25"/>
password:<html:password property="password" size="25"/>
<html:submit property=」submit」/>
</html:form>
</body>
</html>
頁面為用戶登陸頁面，應用到Struts的html標籤。
2.2 LogonForm.java
package com.logon.app;
import javax.servlet.http.*;
import org.apache.struts.action.*;
/**
* This page shows LogonForm.java
* Title: LOGON SYSTEM
* Description: LogonForm Page
* Copyright: Copyright (c) 2004
* Company: www.ewe.com.cn
* @author bluesunny
* @version 1.0
*/
public class LogonForm extends ActionForm{
private String username;
private String password;
public LoginForm() {
username = null;
password = null;
}
public void setUsername(String username){
this.username = username;
}
public String getUsername() {
return this.username;
}
public void setPassword(String password){
this.password = password;
}
public String getPassword(){
return this.password;
}
public void reset(ActionMapping mapping, HttpServletRequest request)
{
username = null;
password = null;
}
}
這個頁面為ActionForm bean ，主要是用來封裝客戶端的用戶名與密碼。
2.3 LogonAction.java
package com.logon.app;
import java.io.*;
import java.sql.*;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
/**
* This page shows LogonAction.java
* Title: LOGON SYSTEM
* Description: LogonAction Page
* Copyright: Copyright (c) 2004
* Company: www.ewe.com.cn
* @author bluesunny
* @version 1.0
*/
public class LogonAction extends Action{
public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response)throws Exception{
LogonForm form = (LogonForm)actionForm;
ActionErrors errors = new ActionErrors();
String username = form.getUsername();
String password = form.getPassword();
If(username.equals(「bluesunny」) && password.equals(「bluesunny」)){
return actionMapping.findForward("success");
}else{
errors.add("login",new ActionError("Logon.failed"));
saveErrors(request,errors);
return actionMapping.findForward("failed");
}
}
}
取得ActionForm中的數據，進行處理，處理結果返回到Jsp頁面。
2.4 web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">
<web-app>
<display-name>Struts Logon Application</display-name>
<!-- Standard Action Servlet Configuration (with debugging) -->
<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>
<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- The Welcome File List -->
<welcome-file-list>
<welcome-file>logon.jsp</welcome-file>
</welcome-file-list>
<!-- Struts Tag Library Descriptors -->
<taglib>
<taglib-uri>/tags/struts-bean</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-html</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-logic</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-nested</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-tiles</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
</web-app>
2.5 struts-config.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<form-beans>
<form-bean name="logonForm" type=" com.logon.app.LoginForm"/>
</form-beans>
<action-mappings>
<action
path="/Logon" type="com.logon.app.LogonAction" name="logonForm" scope="request" input="Logon.jsp">
<forward name="success" path="/success.jsp"/>
<forward name="failure" path="/Logon.jsp"/>
</action>
<message-resources parameter="resources.application"/>
</struts-config>
2.6 application.properties
Logon.failed = Logon failed!Please Logon in again!
2.7 deploy Logon Application
創建一個success.jsp，輸入:"successflly!".
編譯源文件，並且把該應用程序部署在TOMCAT裡，假設部署在app目錄下面。我們可以啟動瀏覽器訪問：http://localhost:8080/app/.
2.8 目錄結構
/WEB-INF :
/ WEB-INF/lib : Struts.jar
/ WEB-INF/classes :
/ WEB-INF/classes/com/logon/app : *.class
/ WEB-INF/classes/resources : *.properties
3. 總結
本文詳細講解了安裝方法，並且舉了一個登陸例子作為Struts框架應用。另外，本文對Struts的目錄結構也有說明，這大大減輕了初學者學習負擔，應該可以作為Struts入門之用。
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