使用Beetl实现静态页生成 博客分类: Beetl Beetljavaservletweb
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2024-02-14 21:15:46
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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
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
模版文件:index.html
web.xml中的配置
由于要对显示的字符串进行截取,定义了两个函数:
生成结果:index.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。
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[0]; if (str == null) { return ""; } else { parentStr = String.valueOf(str); } Object startindex = objects[1]; if (startindex == null) { return ""; } else { start = Integer.valueOf(startindex.toString()); } if (objects.length >= 3) { Object endindex = objects[2]; 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); else parentStr = 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[0]; 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test 10 栏目 <div> <span style="color:red;">栏目1</span> <ul> <li>[栏目…]-新闻消息11---[2012-05-07]</li> <li>[栏目…]-新闻消息21---[2012-05-07]</li> <li>[栏目…]-新闻消息31---[2012-05-07]</li> <li>[栏目…]-新闻消息41---[2012-05-07]</li> <li>[栏目…]-新闻消息51---[2012-05-07]</li> <li>[栏目…]-新闻消息61---[2012-05-07]</li> <li>[栏目…]-新闻消息71---[2012-05-07]</li> <li>[栏目…]-新闻消息81---[2012-05-07]</li> <li>[栏目…]-新闻消息91---[2012-05-07]</li> <li>[栏目…]-新闻消息101---[2012-05-07]</li> <li>[栏目…]-新闻消息111---[2012-05-07]</li> </ul> <span style="color:red;">栏目2</span> <ul> <li>[栏目…]-新闻消息12---[2012-05-07]</li> <li>[栏目…]-新闻消息22---[2012-05-07]</li> <li>[栏目…]-新闻消息32---[2012-05-07]</li> <li>[栏目…]-新闻消息42---[2012-05-07]</li> <li>[栏目…]-新闻消息52---[2012-05-07]</li> <li>[栏目…]-新闻消息62---[2012-05-07]</li> <li>[栏目…]-新闻消息72---[2012-05-07]</li> <li>[栏目…]-新闻消息82---[2012-05-07]</li> <li>[栏目…]-新闻消息92---[2012-05-07]</li> <li>[栏目…]-新闻消息102---[2012-05-07]</li> <li>[栏目…]-新闻消息112---[2012-05-07]</li> </ul> <span style="color:red;">栏目3</span> <ul> <li>[栏目…]-新闻消息13---[2012-05-07]</li> <li>[栏目…]-新闻消息23---[2012-05-07]</li> <li>[栏目…]-新闻消息33---[2012-05-07]</li> <li>[栏目…]-新闻消息43---[2012-05-07]</li> <li>[栏目…]-新闻消息53---[2012-05-07]</li> <li>[栏目…]-新闻消息63---[2012-05-07]</li> <li>[栏目…]-新闻消息73---[2012-05-07]</li> <li>[栏目…]-新闻消息83---[2012-05-07]</li> <li>[栏目…]-新闻消息93---[2012-05-07]</li> <li>[栏目…]-新闻消息103---[2012-05-07]</li> <li>[栏目…]-新闻消息113---[2012-05-07]</li> </ul> <span style="color:red;">栏目4</span> <ul> <li>[栏目…]-新闻消息14---[2012-05-07]</li> <li>[栏目…]-新闻消息24---[2012-05-07]</li> <li>[栏目…]-新闻消息34---[2012-05-07]</li> <li>[栏目…]-新闻消息44---[2012-05-07]</li> <li>[栏目…]-新闻消息54---[2012-05-07]</li> <li>[栏目…]-新闻消息64---[2012-05-07]</li> <li>[栏目…]-新闻消息74---[2012-05-07]</li> <li>[栏目…]-新闻消息84---[2012-05-07]</li> <li>[栏目…]-新闻消息94---[2012-05-07]</li> <li>[栏目…]-新闻消息104---[2012-05-07]</li> <li>[栏目…]-新闻消息114---[2012-05-07]</li> </ul> <span style="color:red;">栏目5</span> <ul> <li>[栏目…]-新闻消息15---[2012-05-07]</li> <li>[栏目…]-新闻消息25---[2012-05-07]</li> <li>[栏目…]-新闻消息35---[2012-05-07]</li> <li>[栏目…]-新闻消息45---[2012-05-07]</li> <li>[栏目…]-新闻消息55---[2012-05-07]</li> <li>[栏目…]-新闻消息65---[2012-05-07]</li> <li>[栏目…]-新闻消息75---[2012-05-07]</li> <li>[栏目…]-新闻消息85---[2012-05-07]</li> <li>[栏目…]-新闻消息95---[2012-05-07]</li> <li>[栏目…]-新闻消息105---[2012-05-07]</li> <li>[栏目…]-新闻消息115---[2012-05-07]</li> </ul> <span style="color:red;">栏目6</span> <ul> <li>[栏目…]-新闻消息16---[2012-05-07]</li> <li>[栏目…]-新闻消息26---[2012-05-07]</li> <li>[栏目…]-新闻消息36---[2012-05-07]</li> <li>[栏目…]-新闻消息46---[2012-05-07]</li> <li>[栏目…]-新闻消息56---[2012-05-07]</li> <li>[栏目…]-新闻消息66---[2012-05-07]</li> <li>[栏目…]-新闻消息76---[2012-05-07]</li> <li>[栏目…]-新闻消息86---[2012-05-07]</li> <li>[栏目…]-新闻消息96---[2012-05-07]</li> <li>[栏目…]-新闻消息106---[2012-05-07]</li> <li>[栏目…]-新闻消息116---[2012-05-07]</li> </ul> <span style="color:red;">栏目7</span> <ul> <li>[栏目…]-新闻消息17---[2012-05-07]</li> <li>[栏目…]-新闻消息27---[2012-05-07]</li> <li>[栏目…]-新闻消息37---[2012-05-07]</li> <li>[栏目…]-新闻消息47---[2012-05-07]</li> <li>[栏目…]-新闻消息57---[2012-05-07]</li> <li>[栏目…]-新闻消息67---[2012-05-07]</li> <li>[栏目…]-新闻消息77---[2012-05-07]</li> <li>[栏目…]-新闻消息87---[2012-05-07]</li> <li>[栏目…]-新闻消息97---[2012-05-07]</li> <li>[栏目…]-新闻消息107---[2012-05-07]</li> <li>[栏目…]-新闻消息117---[2012-05-07]</li> </ul> <span style="color:red;">栏目8</span> <ul> <li>[栏目…]-新闻消息18---[2012-05-07]</li> <li>[栏目…]-新闻消息28---[2012-05-07]</li> <li>[栏目…]-新闻消息38---[2012-05-07]</li> <li>[栏目…]-新闻消息48---[2012-05-07]</li> <li>[栏目…]-新闻消息58---[2012-05-07]</li> <li>[栏目…]-新闻消息68---[2012-05-07]</li> <li>[栏目…]-新闻消息78---[2012-05-07]</li> <li>[栏目…]-新闻消息88---[2012-05-07]</li> <li>[栏目…]-新闻消息98---[2012-05-07]</li> <li>[栏目…]-新闻消息108---[2012-05-07]</li> <li>[栏目…]-新闻消息118---[2012-05-07]</li> </ul> <span style="color:red;">栏目9</span> <ul> <li>[栏目…]-新闻消息19---[2012-05-07]</li> <li>[栏目…]-新闻消息29---[2012-05-07]</li> <li>[栏目…]-新闻消息39---[2012-05-07]</li> <li>[栏目…]-新闻消息49---[2012-05-07]</li> <li>[栏目…]-新闻消息59---[2012-05-07]</li> <li>[栏目…]-新闻消息69---[2012-05-07]</li> <li>[栏目…]-新闻消息79---[2012-05-07]</li> <li>[栏目…]-新闻消息89---[2012-05-07]</li> <li>[栏目…]-新闻消息99---[2012-05-07]</li> <li>[栏目…]-新闻消息109---[2012-05-07]</li> <li>[栏目…]-新闻消息119---[2012-05-07]</li> </ul> <span style="color:red;">栏目10</span> <ul> <li>[栏目…]-新闻消息110---[2012-05-07]</li> <li>[栏目…]-新闻消息210---[2012-05-07]</li> <li>[栏目…]-新闻消息310---[2012-05-07]</li> <li>[栏目…]-新闻消息410---[2012-05-07]</li> <li>[栏目…]-新闻消息510---[2012-05-07]</li> <li>[栏目…]-新闻消息610---[2012-05-07]</li> <li>[栏目…]-新闻消息710---[2012-05-07]</li> <li>[栏目…]-新闻消息810---[2012-05-07]</li> <li>[栏目…]-新闻消息910---[2012-05-07]</li> <li>[栏目…]-新闻消息1010---[2012-05-07]</li> <li>[栏目…]-新闻消息1110---[2012-05-07]</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。