使用Beetl实现静态页生成
使用Beetl 1.1实现静态页的生成。使用struts1.2
首先在Lisener中设置ServletGroupTemplate相关配置。
模版文件位于WEB-INF/template下
public class InitLisener implements ServletContextListener{static Log log = LogFactory.getLog(InitLisener.class);public void contextDestroyed(ServletContextEvent arg0) {ActionServletContext.destroyed();}public void contextInitialized(ServletContextEvent event) {log.info("加载资源文件");ServletContext context = event.getServletContext();String configPath = context.getRealPath("//");ServletGroupTemplate.intance().init(context); ServletGroupTemplate.intance().getGroup().config("<!--:", "-->", "${", "}"); ServletGroupTemplate.intance().getGroup().setCharset("UTF-8"); ServletGroupTemplate.intance().getGroup().registerFunction("fn.substring",new SubStringFunction()); ServletGroupTemplate.intance().getGroup().registerFunction("fn.length",new LengthFunction()); //context.setAttribute("templatepath", context.getRealPath("WEB-INF/template"));System.out.println(context.getRealPath("WEB-INF/template"));ActionServletContext.setServletContext(context);//PropertiesUtil.loadConfig();}}
Action类，其中模拟了一些数据，输出路径为跟路径，文件名为index.html
public class StaticPageAction extends Action {/* * Generated Methods *//** * Method execute ** @param mapping * @param form * @param request * @param response * @return ActionForward */public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {PrintWriter pWriter = null;ActionForward forward = new ActionForward();response.setCharacterEncoding("UTF-8");String templatePath = (String) ActionServletContext.getServletContext().getAttribute("templatepath");String rootpath = ActionServletContext.getServletContext().getRealPath("/");rootpath = rootpath + "/index.html";List<Channel> channelList = getNewsData();try {pWriter = response.getWriter();Template template = ServletGroupTemplate.intance().getTemplate("/index.html", request, response);template.set("channelList", channelList);template.set("user", "chenlei");template.set("Chal", new Channel(1, "栏目test", "栏目说明", 0, 10, 30));StringWriter writer = new StringWriter();template.getText(writer);// false为从文件开始处写入OutputStreamWriter outWriter = new OutputStreamWriter(new FileOutputStream(rootpath, false), "UTF-8");System.out.println(writer.toString());Writer out = new BufferedWriter(outWriter);out.write(writer.toString());out.flush();out.close();pWriter.print("输出首页成功！<a href='index.jsp'>返回</>");} catch (IOException e) {pWriter.print("输出首页失败！");} catch (BeeException e) {// e.printStackTrace();}return null;}private List<Channel> getNewsData() {List<Channel> newList = new ArrayList<Channel>(20);for (int i = 1; i <= 10; i++) {Channel chnnel = new Channel(i, "栏目" + i, "栏目说明" + i, 0, 10, 30);for (int j = 1; j <= 11; j++) {News news = new News(j + i,"新闻消息" + j + i,"新华社消息： 控制语句占位符号是/<!--: ，这样，尽可能然模板少破坏原有文件，你可以通过浏览器直接浏览模板文件",new Date(), "chnnal/news/" + j + i + "html");news.setChannelId(i);news.setChannelTitle(chnnel.getChnnelTitle());chnnel.addNewsList(news);}newList.add(chnnel);}return newList;}}
模版文件:index.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <title>Index.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"></head> <body><!--:if(user!=null){-->你好！${user}<br>${Chal.chnnelTitle}${channelList.~size}<!--:}--> 栏目列表 <div> <!--: if(channelList.~size!=0){ for(Channel in channelList){--> <span style="color:red;">${Channel.chnnelTitle}</span> <ul><!--: for(News in Channel.newsList){--> <li>[<!--:if(fn.length(News.channelTitle)>2){ -->${fn.substring(News.channelTitle,0,2)}…<!--: }else{ -->${News.channelTitle} <!--:} -->]-${News.title}---[${News.newdate,dateFormat='yyyy-MM-dd'}]</li> <!--: } --> </ul> <!--: } }else {--> <span style="color:red;">没有数据</span> <!--:}--> </div></body></html>
web.xml中的配置
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><listener> <listener-class>com.otos.cl.common.listerner.InitLisener</listener-class></listener><context-param><param-name>GroupTemplate.Root</param-name><param-value>/WEB-INF/template</param-value></context-param><context-param><param-name>GroupTemplate.Optimize</param-name><param-value>true</param-value></context-param><context-param><param-name>GroupTemplate.NativeCall</param-name><param-value>true</param-value></context-param><context-param><param-name>GroupTemplate.Check</param-name><param-value>2</param-value></context-param><filter> <filter-name>encode</filter-name> <filter-class>com.otos.cl.common.filter.FilterEncoding</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param></filter><filter-mapping> <filter-name>encode</filter-name> <url-pattern>/*</url-pattern></filter-mapping><servlet> <servlet-name>act</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>3</param-value> </init-param> <init-param> <param-name>detail</param-name> <param-value>3</param-value> </init-param> <load-on-startup>0</load-on-startup></servlet><servlet-mapping> <servlet-name>act</servlet-name> <url-pattern>*.do</url-pattern></servlet-mapping><welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.jsp</welcome-file> </welcome-file-list></web-app>
由于要对显示的字符串进行截取，定义了两个函数：
/** * 用于在模版中截取字符串长度的函数 ** @author chenl **/public class SubStringFunction implements Function {public Object call(Object[] objects, Context ctx) {String parentStr = "";Integer start = 0;Integer end = 0;Object str = objects;if (str == null) {return "";} else {parentStr = String.valueOf(str);}Object startindex = objects;if (startindex == null) {return "";} else {start = Integer.valueOf(startindex.toString());}if (objects.length >= 3) {Object endindex = objects;if (endindex != null) {end = Integer.valueOf(endindex.toString());}}if (start < 0 || end < 0) {throw new IllegalStateException("SubString函数中参数startindex和endindex不能小于0");}int length = parentStr.length();if (length == 1) {return parentStr;} else {if (end == 0)parentStr = parentStr.substring(start);elseparentStr = parentStr.substring(start, end);}return parentStr;}}
/** * Beetl自定义函数 * @author chenl * */public class LengthFunction implements Function {public Object call(Object[] arg0, Context arg1) {int length = 0;if(arg0.length==1){Object obj = arg0;if(obj instanceof String) {length = ((String) obj).length();}else if(obj instanceof Integer){length = ((String) obj).length();}else if(obj instanceof Double){length = ((String) obj).length();}else if(obj instanceof Float){length = ((String) obj).length();}else{throw new IllegalStateException("参数不正确");}}else{throw new IllegalStateException("参数不正确");}return length;}}
生成结果：index.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <title>Index.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"></head> <body>你好！chenlei<br>栏目test10 栏目 <div> <span style="color:red;">栏目1</span> <ul> <li>[栏目…]-新闻消息11---</li> <li>[栏目…]-新闻消息21---</li> <li>[栏目…]-新闻消息31---</li> <li>[栏目…]-新闻消息41---</li> <li>[栏目…]-新闻消息51---</li> <li>[栏目…]-新闻消息61---</li> <li>[栏目…]-新闻消息71---</li> <li>[栏目…]-新闻消息81---</li> <li>[栏目…]-新闻消息91---</li> <li>[栏目…]-新闻消息101---</li> <li>[栏目…]-新闻消息111---</li> </ul> <span style="color:red;">栏目2</span> <ul> <li>[栏目…]-新闻消息12---</li> <li>[栏目…]-新闻消息22---</li> <li>[栏目…]-新闻消息32---</li> <li>[栏目…]-新闻消息42---</li> <li>[栏目…]-新闻消息52---</li> <li>[栏目…]-新闻消息62---</li> <li>[栏目…]-新闻消息72---</li> <li>[栏目…]-新闻消息82---</li> <li>[栏目…]-新闻消息92---</li> <li>[栏目…]-新闻消息102---</li> <li>[栏目…]-新闻消息112---</li> </ul> <span style="color:red;">栏目3</span> <ul> <li>[栏目…]-新闻消息13---</li> <li>[栏目…]-新闻消息23---</li> <li>[栏目…]-新闻消息33---</li> <li>[栏目…]-新闻消息43---</li> <li>[栏目…]-新闻消息53---</li> <li>[栏目…]-新闻消息63---</li> <li>[栏目…]-新闻消息73---</li> <li>[栏目…]-新闻消息83---</li> <li>[栏目…]-新闻消息93---</li> <li>[栏目…]-新闻消息103---</li> <li>[栏目…]-新闻消息113---</li> </ul> <span style="color:red;">栏目4</span> <ul> <li>[栏目…]-新闻消息14---</li> <li>[栏目…]-新闻消息24---</li> <li>[栏目…]-新闻消息34---</li> <li>[栏目…]-新闻消息44---</li> <li>[栏目…]-新闻消息54---</li> <li>[栏目…]-新闻消息64---</li> <li>[栏目…]-新闻消息74---</li> <li>[栏目…]-新闻消息84---</li> <li>[栏目…]-新闻消息94---</li> <li>[栏目…]-新闻消息104---</li> <li>[栏目…]-新闻消息114---</li> </ul> <span style="color:red;">栏目5</span> <ul> <li>[栏目…]-新闻消息15---</li> <li>[栏目…]-新闻消息25---</li> <li>[栏目…]-新闻消息35---</li> <li>[栏目…]-新闻消息45---</li> <li>[栏目…]-新闻消息55---</li> <li>[栏目…]-新闻消息65---</li> <li>[栏目…]-新闻消息75---</li> <li>[栏目…]-新闻消息85---</li> <li>[栏目…]-新闻消息95---</li> <li>[栏目…]-新闻消息105---</li> <li>[栏目…]-新闻消息115---</li> </ul> <span style="color:red;">栏目6</span> <ul> <li>[栏目…]-新闻消息16---</li> <li>[栏目…]-新闻消息26---</li> <li>[栏目…]-新闻消息36---</li> <li>[栏目…]-新闻消息46---</li> <li>[栏目…]-新闻消息56---</li> <li>[栏目…]-新闻消息66---</li> <li>[栏目…]-新闻消息76---</li> <li>[栏目…]-新闻消息86---</li> <li>[栏目…]-新闻消息96---</li> <li>[栏目…]-新闻消息106---</li> <li>[栏目…]-新闻消息116---</li> </ul> <span style="color:red;">栏目7</span> <ul> <li>[栏目…]-新闻消息17---</li> <li>[栏目…]-新闻消息27---</li> <li>[栏目…]-新闻消息37---</li> <li>[栏目…]-新闻消息47---</li> <li>[栏目…]-新闻消息57---</li> <li>[栏目…]-新闻消息67---</li> <li>[栏目…]-新闻消息77---</li> <li>[栏目…]-新闻消息87---</li> <li>[栏目…]-新闻消息97---</li> <li>[栏目…]-新闻消息107---</li> <li>[栏目…]-新闻消息117---</li> </ul> <span style="color:red;">栏目8</span> <ul> <li>[栏目…]-新闻消息18---</li> <li>[栏目…]-新闻消息28---</li> <li>[栏目…]-新闻消息38---</li> <li>[栏目…]-新闻消息48---</li> <li>[栏目…]-新闻消息58---</li> <li>[栏目…]-新闻消息68---</li> <li>[栏目…]-新闻消息78---</li> <li>[栏目…]-新闻消息88---</li> <li>[栏目…]-新闻消息98---</li> <li>[栏目…]-新闻消息108---</li> <li>[栏目…]-新闻消息118---</li> </ul> <span style="color:red;">栏目9</span> <ul> <li>[栏目…]-新闻消息19---</li> <li>[栏目…]-新闻消息29---</li> <li>[栏目…]-新闻消息39---</li> <li>[栏目…]-新闻消息49---</li> <li>[栏目…]-新闻消息59---</li> <li>[栏目…]-新闻消息69---</li> <li>[栏目…]-新闻消息79---</li> <li>[栏目…]-新闻消息89---</li> <li>[栏目…]-新闻消息99---</li> <li>[栏目…]-新闻消息109---</li> <li>[栏目…]-新闻消息119---</li> </ul> <span style="color:red;">栏目10</span> <ul> <li>[栏目…]-新闻消息110---</li> <li>[栏目…]-新闻消息210---</li> <li>[栏目…]-新闻消息310---</li> <li>[栏目…]-新闻消息410---</li> <li>[栏目…]-新闻消息510---</li> <li>[栏目…]-新闻消息610---</li> <li>[栏目…]-新闻消息710---</li> <li>[栏目…]-新闻消息810---</li> <li>[栏目…]-新闻消息910---</li> <li>[栏目…]-新闻消息1010---</li> <li>[栏目…]-新闻消息1110---</li> </ul> </div></body></html>
感觉自定义函数功能不错，但是也麻烦了些，两个函数就要写两个类。
如果能归类就好了，比如对字符串的操作，一个自定义函数中不同的方法就可以搞定。
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