freemarker简单示例

package com.freemarker.servlet; import java.io.IOException; import java.io.Writer; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import freemarker.template.Configuration; import freemarker.template.Template; public class HelloServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; private Configuration cfg; public void init(){ //初始化FreeMarker配置 //创建一个Configuration实例 cfg = new Configuration(); //设置FreeMarker的模板文件位置 cfg.setServletContextForTemplateLoading(getServletContext(), "WEB-INF/templates"); } public void service (HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException{ //建立数据模型 Map root = new HashMap(); //测试${} root.put("name", "中国"); root.put("msg", "web的第一个FreeMarker实例"); //测试<#if></#if> root.put("a", new Integer(1)); root.put("b", "1"); boolean flag = true; root.put("flag", flag); //测试<#list> List numbers = new ArrayList(); numbers.add(1); numbers.add(2); numbers.add(3); root.put("numbers", numbers); //测试 root.put("userName", new String()); String[] seq = {"a","b","c","d","e"}; root.put("seq", seq); //内建函数 root.put("大于小于", "&lt;&gt;"); //测试date Date date = new Date(); root.put("date", date); //取得模型文件 Template t = cfg.getTemplate("templates.ftl"); //开始准备生成输出 //使用模板文件的charset作为本页面的charset //使用text/html MIME-type response.setContentType("text/html;charset=" + t.getEncoding()); Writer out = response.getWriter(); //合并数据模型和模板，并将结果输出到out中 try { t.process(root, out); } catch (Exception e) { throw new ServletException("处理Template模板中出项错误" , e); } } }