freemarker是一款java模板引擎，本质上是一个java类库，可以按照用户定义好的ftl模板文件来生成符合模板格式的动态页面，属于web应用的view表示层技术。
本文有两个小程序例子，展示了freemarker的两种不同用法：
1、使用ftl模板直接返回输出，类似于jsp
2、由ftl生成静态的html页面，这种技术适用于各种网站的后台内容管理系统。
首先看一下工程结构：
/**
* Servlet implementation class HelloFreemarkerServlet
*/
@WebServlet("/HelloFreemarkerServlet")
public class HelloFreemarkerServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private Configuration config = null;
private final String TEMPLATE_URL = "/WEB-INF/templates";
/**
* @see HttpServlet#HttpServlet()
*/
public HelloFreemarkerServlet() {
super();
}
@SuppressWarnings("deprecation")
public void init(){
config = new Configuration();
config.setServletContextForTemplateLoading(getServletContext(), TEMPLATE_URL);
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HashMap rootMap = new HashMap();
rootMap.put("message", "Hello world");
rootMap.put("name", "liny");
Template template = config.getTemplate("test.ftl");
response.setContentType("text/html; charset=" + template.getEncoding());
Writer out = response.getWriter();
try {
template.process(rootMap, out);
} catch (TemplateException e) {
e.printStackTrace();
}
}
}
public class FreemarkerTest {
public static void main(String[] args) throws IOException, TemplateException{
final String pagePath = "F:\\workspace\\freemarker\\WebContent\\";
final String templatePath = "F:\\workspace\\freemarker\\WebContent\\WEB-INF\\templates";
HashMap map = new HashMap();
map.put("message", "你好");
map.put("name", "大臭");
Configuration config = new Configuration();
config.setDirectoryForTemplateLoading(new File(templatePath));
FileOutputStream fos = new FileOutputStream(pagePath+"test.html");
OutputStreamWriter writer = new OutputStreamWriter(fos);
Template template = config.getTemplate("test.ftl");
template.process(map, writer);
writer.flush();
writer.close();
}
}
<html>
<head>
<title>freemarker测试</title>
</head>
<body>
<h1>${message} , ${name}</h1>
</body>
</html>
时间： 2024-11-08 18:20:58