前提条件：
在WEB-INF下建立templates文件夹，存放模板文件
首先建立index.tpl文件
<html>
<body>
${message}
</body>
</html>
下面是加载freemarker进行模板渲染输出
package main;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
/**
* Servlet implementation class Hello
*/
@WebServlet("/Hello")
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
private Configuration cfg = null;
@Override
public void init(){
//初始化freemarker环境
cfg = new Configuration();
//加载模板
cfg.setServletContextForTemplateLoading(getServletContext(), "WEB-INF/templates");
//设置模板更新时间，本地调试时设置为0
cfg.setTemplateUpdateDelay(0);
//设置默认输出字符集
cfg.setOutputEncoding("UTF-8");
}
public Hello() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Template t = cfg.getTemplate("index.tpl");
response.setContentType("text/html; charset=" + cfg.getOutputEncoding());
Writer out = response.getWriter();
Map root = new HashMap();
root.put("message", "hello world!");
try {
t.process(root, out);
} catch (TemplateException e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}