實戰Struts-Menu

一、簡介
Struts-Menu是一組從基於XML的配置文件中生成多種樣式的菜單的JSP Tags，並且可以結合API開發通過數據庫生成的動態菜單。Struts-Menu支持國際化和多種權限控制。

二、運行環境
Windows 2000 Professional
JDK 1.4.2_03
Eclipse 3.1
Tomcat 5.0.28
Tomcat Plugin 3.1Beta
Struts 1.2.7
Commons-Lang 2.1
Commons-Collections 3.1
Struts-Menu 2.3
MySQL 4.1.10a-nt

三、下載與安裝
1：從http://java.sun.com下載J2SDK，當前1.4.x系列的最新版本爲1.4.2_08
2：從http://www.eclipse.org下載Eclipse，當前最新版本爲3.1正式版
3：從http://jakarta.apache.org/tomcat下載Tomcat，當前5.x系列的最新版本爲5.0.28
4：從http://www.sysdeo.com/eclipse/tomcatplugin下載Eclipse的Tomcat插件，對應Eclipse3.1x的最新版本爲3.1Beta
5：從http://struts.apache.org下載Struts，當前最新版本爲1.2.7
6：從http://jakarta.apache.org/commons/下載Commons-Lang，當前最新版本爲2.1，下載Commons-Collections，當前最新版本爲3.1
7：從http://struts-menu.sourceforge.net下載Struts Menu，當前最新版本爲2.3
8：從http://www.mysql.com下載MySQL數據庫，4.x系列的最新版本是4.1.12a
9：MySQL、JDK、Eclipse、Tomcat和TomcatPlugin的安裝及配置請參考相關資料

四、運行示例程序
1：安裝好Tomcat後，解壓縮struts-menu-2.3.zip，將struts-menu.war釋放到Tomcat安裝目錄下的webapps下，運行Tomcat
2：在地址欄輸入http://localhost:8080/struts-menu

五、安裝與配置
1：在Eclipse中新建Tomcat項目，Context爲/mymenu，Subdirectory爲/web
2：在項目目錄下面新建lib目錄和web目錄及WEB-INF，在web/WEB-INF目錄下新建web.xml，內容如下：
<?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/dtd/web-app_2_3.dtd">

<web-app>
<display-name>My Example Application -- Vinton Lee</display-name>

<!-- ============= The Struts ActionServlet Configuration ============= -->
<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>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- ================================================================== -->

<!-- ============= The Struts 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>index.jsp</welcome-file>
</welcome-file-list>

<!-- =============== The Struts Taglib Definition ===================== -->
<taglib>
<taglib-uri>struts-bean</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>struts-html</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>struts-logic</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>struts-nested</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>struts-tiles</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
<!-- ================================================================== -->

<!-- ============= The Struts-Menu Taglib Definition ================== -->
<taglib>
<taglib-uri>struts-menu</taglib-uri>
<taglib-location>/WEB-INF/struts-menu.tld</taglib-location>
</taglib>
<!-- ================================================================== -->
</web-app>

3：解壓縮struts-1.2.7.zip，將壓縮包中的lib目錄下所有的8個jar釋放到lib目錄中，將5個tld文件釋放到webWEB-INF目錄中，在webWEB-INF目錄中新建struts-config.xml，內容如下：
<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>

<!-- ========== Data Source Configuration =============================== -->
<data-sources />

<!-- ========== Form Bean Definitions =================================== -->
<form-beans />

<!-- ========== Global Exception Definitions ============================ -->
<global-exceptions />

<!-- ========== Global Forward Definitions ============================== -->
<global-forwards />

<!-- ========== Action Mapping Definitions ============================== -->
<action-mappings />

<!-- ========== Controller Configuration ================================ -->

<!-- ========== Message Resources Definitions =========================== -->
<message-resources parameter="application" />

<!-- ========== Plug Ins Configuration ================================== -->
<plug-in className="net.sf.navigator.menu.MenuPlugIn">
<set-property property="menuConfig" value="/WEB-INF/menu-config.xml"/>
</plug-in>

</struts-config>

4：解壓縮struts-menu-2.3.zip，將壓縮包中的jstl-1.0.6.jar、standard-1.0.6.jar、struts-menu-2.3.jar釋放到lib目錄中，將壓縮包中的struts-menu.tld、struts-menu-el.tld釋放到webWEB-INF目錄中，解壓縮commons-lang-2.1.zip，將commons-lang-2.1.jar解壓縮到lib目錄中，注意，在Struts-Menu的文檔中沒有看到需要這個包，但是沒有這個包卻無法成功加載。在webWEB-INF目錄中新建menu-config.xml，內容如下：
<?xml version="1.0" encoding="UTF-8" ?>

<MenuConfig>

<Displayers>
<Displayer name="DropDown"
type="net.sf.navigator.displayer.DropDownMenuDisplayer"/>
<Displayer name="Simple"
type="net.sf.navigator.displayer.SimpleMenuDisplayer"/>
<Displayer name="CoolMenu"
type="net.sf.navigator.displayer.CoolMenuDisplayer"/>
<Displayer name="CoolMenu4"
type="net.sf.navigator.displayer.CoolMenuDisplayer4"/>
<Displayer name="MenuForm"
type="net.sf.navigator.example.PermissionsFormMenuDisplayer"/>
<Displayer name="ListMenu"
type="net.sf.navigator.displayer.ListMenuDisplayer"/>
<Displayer name="TabbedMenu"
type="net.sf.navigator.displayer.TabbedMenuDisplayer"/>
<Displayer name="Velocity"
type="net.sf.navigator.displayer.VelocityMenuDisplayer"/>
</Displayers>

<Menus>
<Menu name="DoorSite" title="DoorSite" description="Some famous doorsite" width="50">
<Item name="Yahoo" title="Yahoo">
<Item name="YahooIndex" title="Yahoo Index" location="http://www.yahoo.com.cn"/>
<Item name="YahooMail" title="Yahoo Mail" location="http://cn.mail.yahoo.com"/>
</Item>
<Item name="Sohu" title="Sohu" location="http://www.sohu.com"/>
<Item name="Sina" title="Sina" location="http://www.sina.com.cn"/>
</Menu>
</Menus>

</MenuConfig>

5：將第四步的示例程序中的struts-menu應用目錄下的images、scripts、styles三個目錄中的內容複製到web目錄下

6：你的目錄結構應該類似如下：
%PROJECT_HOME%classes
%PROJECT_HOME%lib
%PROJECT_HOME%libantlr.jar
%PROJECT_HOME%libcommons-beanutils.jar
%PROJECT_HOME%libcommons-digester.jar
%PROJECT_HOME%libcommons-fileupload.jar
%PROJECT_HOME%libcommons-lang-2.1.jar
%PROJECT_HOME%libcommons-logging.jar
%PROJECT_HOME%libcommons-validator.jar
%PROJECT_HOME%libjakarta-oro.jar
%PROJECT_HOME%libjstl-1.0.6.jar
%PROJECT_HOME%libstandard-1.0.6.jar
%PROJECT_HOME%libstruts.jar
%PROJECT_HOME%libstruts-menu-2.3.jar
%PROJECT_HOME%src
%PROJECT_HOME%srclog4j.properties
%PROJECT_HOME%srcapplication.properties
%PROJECT_HOME%srcapplication_zh_CN.properties
%PROJECT_HOME%web
%PROJECT_HOME%webimages...
%PROJECT_HOME%webscripts...
%PROJECT_HOME%webstyles...
%PROJECT_HOME%webWEB-INF
%PROJECT_HOME%webWEB-INFmenu-config.xml
%PROJECT_HOME%webWEB-INFstruts-bean.tld
%PROJECT_HOME%webWEB-INFstruts-config.xml
%PROJECT_HOME%webWEB-INFstruts-html.tld
%PROJECT_HOME%webWEB-INFstruts-logic.tld
%PROJECT_HOME%webWEB-INFstruts-menu.tld
%PROJECT_HOME%webWEB-INFstruts-menu-el.tld
%PROJECT_HOME%webWEB-INFstruts-nested.tld
%PROJECT_HOME%webWEB-INFstruts-tiles.tld
%PROJECT_HOME%webWEB-INFweb.xml

六、實戰Struts-Menu
1：使用配置文件實現靜態菜單
新建JSP文件web/static-menu.jsp，內容如下：
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="struts-menu" prefix="menu" %>

<menu:useMenuDisplayer name="ListMenu"
bundle="org.apache.struts.action.MESSAGE">
<menu:displayMenu name="DoorSite"/>
</menu:useMenuDisplayer>
運行Tomcat，在IE地址欄輸入http://localhost:8080/mymenu/static-menu.jsp查看

2：實現中文化
> 在srcapplication_zh_CN.properties中增加下面的內容，Unicode可以通過JDK自帶的native2ascii工具得到：
#門戶網站
menu.DoorSite=u95e8u6237u7f51u7ad9
#雅虎
menu.Yahoo=u96c5u864e
#雅虎首頁
menu.YahooIndex=u96c5u864eu9996u9875
#雅虎郵件
menu.YahooMail=u96c5u864eu90aeu4ef6
#搜狐
menu.Sohu=u641cu72d0
#新浪
menu.Sina=u65b0u6d6a
> 在srcapplication.properties中增加下面的內容：
#門戶網站
menu.DoorSite=DoorSite
#雅虎
menu.Yahoo=Yahoo
#雅虎首頁
menu.YahooIndex=Yahoo Index
#雅虎郵件
menu.YahooMail=Yahoo Mail
#搜狐
menu.Sohu=Sohu
#新浪
menu.Sina=Sina
> 修改menu-config.xml文件<Menus></Menus>部分：
<Menus>
<Menu name="DoorSite" title="menu.DoorSite" description="Some famous doorsite" width="50">
<Item name="Yahoo" title="menu.Yahoo">
<Item name="YahooIndex" title="menu.YahooIndex" location="http://www.yahoo.com.cn"/>
<Item name="YahooMail" title="menu.YahooMail" location="http://cn.mail.yahoo.com"/>
</Item>
<Item name="Sohu" title="menu.Sohu" location="http://www.sohu.com"/>
<Item name="Sina" title="menu.Sina" location="http://www.sina.com.cn"/>
</Menu>
</Menus>
重起Tomcat，在IE地址欄輸入http://localhost:8080/mymenu/static-menu.jsp查看

3：結合數據庫實現動態菜單
> 新建數據myexamples：
CREATE DATABASE myexamples
> 新建數據庫表menu_item：
CREATE TABLE menu_item (
id BIGINT not null,
parent_name VARCHAR(30),
name VARCHAR(30),
title VARCHAR(30),
titleCN VARCHAR(30),
description VARCHAR(50),
location VARCHAR(255),
target VARCHAR(10),
onclick VARCHAR(100),
onmouseover VARCHAR(100),
onmouseout VARCHAR(100),
image VARCHAR(50),
altImage VARCHAR(30),
tooltip VARCHAR(100),
roles VARCHAR(100),
page VARCHAR(255),
width VARCHAR(5),
height VARCHAR(5),
forward VARCHAR(50),
action VARCHAR(50),
primary key (id)
)
> 插入測試數據：
INSERT INTO menu_item
(id, parent_name, name, title, titleCN, location)
VALUES
(1,null,'DatabaseMenu','Database Menu','數據庫動態菜單',null),
(2,'DatabaseMenu','Yahoo','Yahoo Mail','雅虎郵件','http://mail.yahoo.com'),
(3,'DatabaseMenu','JavaBlogs','JavaBlogs','Java博客','http://javablogs.com'),
(4,null,'StandaloneMenu','Standalone Menu','獨立的菜單','http://www.sohu.com')
> 將數據庫驅動程序放到lib目錄中，並加入到Build Path，如MySQL的數據庫驅動mysql-connector-java-3.1.8-bin.jar，解壓縮commons-collections-3.1.zip，將commons-collections-3.1.jar釋放到lib目錄，並加入Build Path
> 新建一個Struts的Action，代碼如下：
package cn.appex.menu;

import java.io.UnsupportedEncodingException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.ListResourceBundle;
import java.util.Map;

import com.mysql.jdbc.Driver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import net.sf.navigator.menu.MenuComponent;
import net.sf.navigator.menu.MenuRepository;
import net.sf.navigator.menu.PermissionsAdapter;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class MenuAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
buildMenuRepository(request);
buildMenuResourceBundle(request);
buildMenuPermissions(request);
return (mapping.findForward("success"));
}

/**
* 創建菜單數據結構
*
* @param request
*/
private void buildMenuRepository(HttpServletRequest request) {
MenuRepository repository = new MenuRepository();
// Get the repository from the application scope - and copy the
// DisplayerMappings from it.
MenuRepository defaultRepository = (MenuRepository) request
.getSession().getServletContext().getAttribute(
MenuRepository.MENU_REPOSITORY_KEY);
repository.setDisplayers(defaultRepository.getDisplayers());

Map[] menus = getMenuComponents();
for (int i=0; i < menus.length; i++) {
MenuComponent mc = new MenuComponent();
Map row = menus[i];
String name = (String) row.get("name");
mc.setName(name);
String parent = (String) row.get("parent_name");
System.out.println(name + ", parent is: " + parent);
if (parent != null) {
MenuComponent parentMenu = repository.getMenu(parent);
if (parentMenu == null) {
System.out.println("parentMenu '" + parent + "' doesn't exist!");
// create a temporary parentMenu
parentMenu = new MenuComponent();
parentMenu.setName(parent);
repository.addMenu(parentMenu);
}

mc.setParent(parentMenu);
}
String title = (String) row.get("title");
mc.setTitle(title);
String location = (String) row.get("location");
mc.setLocation(location);
String description = (String) row.get("description");
mc.setDescription(description);
repository.addMenu(mc);
}

request.setAttribute("examplesRepository", repository);
}

/**
* 從數據庫中讀取菜單配置信息
*
* @return
*/
private Map[] getMenuComponents() {
ArrayList list = new ArrayList();
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rest = null;
String sql = "select name,parent_name,title,location,description from menu_item order by id";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost/myexamples?user=root&password=mywangya&useUnicode=true&characterEncoding=UTF-8");
pstmt = conn.prepareStatement(sql);
rest = pstmt.executeQuery();
while (rest.next()) {
int i = 1;
HashMap map = new HashMap();
map.put("name", rest.getString(i++));
map.put("parent_name", rest.getString(i++));
map.put("title", rest.getString(i++));
map.put("location", rest.getString(i++));
map.put("description", rest.getString(i++));
list.add(map);
}
} catch (SQLException ex) {
ex.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (null!=rest) rest.close();
if (null!=pstmt) pstmt.close();
if (null!=conn) conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

return (Map[]) list.toArray(new HashMap[0]);
}

/**
* 構造菜單權限
*
* @param request
*/
private void buildMenuPermissions(HttpServletRequest request) {
PermissionsAdapter permession = new PermissionsAdapter() {
public boolean isAllowed(MenuComponent menu) {
// 名稱等於StandaloneMenu的菜單不顯示
return !"StandaloneMenu".equalsIgnoreCase(menu.getName());
}
};
request.setAttribute("examplesPermession", permession);
}

/**
* 構造菜單顯示標題
*
* @param request
*/
private void buildMenuResourceBundle(HttpServletRequest request) {
MenuResourceBundle resourceBundle = new MenuResourceBundle();
request.setAttribute("examplesBundle", resourceBundle);
}

/**
* MenuResourceBundle樹狀菜單國際語言顯示
*
* @author wenbin.zhang
*
*/
class MenuResourceBundle extends ListResourceBundle {
private ArrayList list = new ArrayList();

public MenuResourceBundle() {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rest = null;
String sql = "select title,titleCN from menu_item order by id";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost/myexamples?user=root&password=mywangya&useUnicode=true&characterEncoding=UTF-8");
pstmt = conn.prepareStatement(sql);
rest = pstmt.executeQuery();
while (rest.next()) {
int i = 1;
String[] message = new String[2];
message[0] = rest.getString(i++);
try {
message[1] = new String(rest.getString(i++).getBytes("latin1"), "gbk");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (message[0] != null && message[1] != null) {
list.add(message);
}
}
} catch (SQLException ex) {
ex.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (null!=rest) rest.close();
if (null!=pstmt) pstmt.close();
if (null!=conn) conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

}

public Object[][] getContents() {
return (String[][]) list.toArray(new String[0][0]);
}
}
}

> 將struts-config.xml文件的<action-mappings />部分修改爲：
<action-mappings>
<action path="/menuAction" type="cn.appex.menu.MenuAction" >
<forward name="success" path="/struts-menu/dynamic-menu.jsp" />
</action>
</action-mappings>
> 新建JSP文件web/dynamic-menu.jsp，內容如下：
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="struts-menu" prefix="menu" %>

<p>沒有使用Bundle和權限控制:
<menu:useMenuDisplayer name="ListMenu" repository="examplesRepository">
<menu:displayMenu name="DatabaseMenu"/>
<menu:displayMenu name="StandaloneMenu"/>
</menu:useMenuDisplayer></p>

<p>使用Bundle, 沒有使用權限控制:
<menu:useMenuDisplayer name="ListMenu" bundle="examplesBundle" repository="examplesRepository">
<menu:displayMenu name="DatabaseMenu"/>
<menu:displayMenu name="StandaloneMenu"/>
</menu:useMenuDisplayer></p>

<p>使用Bundle和權限控制:
<menu:useMenuDisplayer name="ListMenu" permissions="examplesPermession" bundle="examplesBundle" repository="examplesRepository">
<menu:displayMenu name="DatabaseMenu"/>
<menu:displayMenu name="StandaloneMenu"/>
</menu:useMenuDisplayer></p>
重起Tomcat，在地址欄輸入http://localhost:8080/mymenu/menuAction.do