velocity1.5使用总结
1：下载地址：http://velocity.apache.org/download.cgi（velocity-dep-1.5.jar）
2：velocity初始化（最好在tomcat启动时执行）：
private void initVelocity() throws Exception {
Velocity.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH,
getServletContext().getRealPath("c:/template"));
Velocity.setProperty(Velocity.COUNTER_NAME, "velocityCount");
Velocity.setProperty(Velocity.COUNTER_INITIAL_VALUE, "0");
Velocity.setProperty(Velocity.ENCODING_DEFAULT, "UTF-8");
Velocity.setProperty(Velocity.INPUT_ENCODING, "UTF-8");
Velocity.setProperty(Velocity.OUTPUT_ENCODING, "UTF-8");
Velocity.init();
}
3：存放velocity信息的javabean（VelocityInfo）
package javabean;
import org.apache.velocity.VelocityContext;
public class VelocityInfo {
private String templateName;//模板的真实路径
private String htmlName;//静态化文件的真实路径
private VelocityContext context;//标记语言的数据
public String getHtmlName() {
return htmlName;
}
public void setHtmlName(String htmlName) {
this.htmlName = htmlName;
}
public String getTemplateName() {
return templateName;
}
public void setTemplateName(String templateName) {
this.templateName = templateName;
}
public VelocityContext getContext() {
return context;
}
public void setContext(VelocityContext context) {
this.context = context;
}
}
4.得到要预览文件的数据
protected VelocityInfo getPrevieArticleData(Article article) {
VelocityInfo velocityInfo = new VelocityInfo();
velocityInfo.setTemplateName(article.getColumnPath() + "_article.vm");
VelocityContext context = new VelocityContext();
context.put("publicTime", "2008-10-01");
context.put("title", "测试文章");
context.put("content", "测试数据。。。");
context.put("webRoot", "http://127.0.0.1");
velocityInfo.setContext(context);
velocityInfo.setContext(context);
return velocityInfo;
}
5：得到要静态化文件的数据
protected VelocityInfo getStaticArticleData(Article article) {
VelocityInfo velocityInfo = getPrevieArticleData(article);
String htmlPath = InitServlet.PATH + "/" + article.getChannelPath() + "/"
+ article.getColumnPath() + "/" + PubFun.getDateTime("yyyy-MM-dd", article.getCreateTime());
File f = new File(htmlPath);
if (!f.exists()) {
f.mkdirs();
}
velocityInfo.setHtmlName(htmlPath + "/" + article.getId() + ".html");
return velocityInfo;
}
6：预览volecity页面
private void velocityPreview(VelocityInfo velocityInfo, HttpServletResponse resp) throws Exception{
Template t = null;
PrintWriter out = null;
try {
t = Velocity.getTemplate(velocityInfo.getTemplateName());
out = resp.getWriter();
t.merge(velocityInfo.getContext(), out);
} catch (ParseErrorException e) {
throw new Exception("模板格式不对：" + e);
} finally {
if (out != null)
out.close();
}
7：静态化页面
private void velocityStatic(VelocityInfo velocityInfo) throws Exception{
Template t = null;
Writer out = null;
try {//文件不存在可以自动生成；目录一定要存在
t = Velocity.getTemplate(velocityInfo.getTemplateName());
out = new BufferedWriter(new FileWriter(velocityInfo.getHtmlName()));
t.merge(velocityInfo.getContext(), out);
} catch (ParseErrorException e) {
throw new Exception("模板格式不对：" + e);
} finally {
if (out != null)
out.close();
}
}
8 :模板文件（(_article.vm）例子
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"></meta>
<head>
<title>测试velocity</title>
<link href="${webRoot}/css/yucheng.css" rel="stylesheet" type="text/css" />
</head>
<body
<p align="center">${title}<p>
<p align="center">${publicTime}<p>
<p align="center">${content}<p>
<p align="center"><a href="javascript:window.close();">关闭窗口</a> ]</p>
</body>
</html>