使用Beetl实现静态页生成 博客分类： Beetl Beetljavaservletweb
程序员文章站
2024-02-14 21:15:40
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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。