1.把包lib/html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.jar拷贝到项目中
2.新建模板文件WEB-INF/html" title=class>class="tags" href="/tags/TEMPLATES.html" title=templates>templates/test.ftl，内容如下：
Hello,${name}!
3.新建一个操作类Class1.java，(把模板装载到jsp页面中）. 内容如下
package com.abc.web;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.jsp.PageContext;
import html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.template.Configuration;
import html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.template.Template;
public html" title=class>class Class1 {
public void execute(PageContext pageContext)throws Exception
{
Configuration cfg =new Configuration();
cfg.setServletContextForTemplateLoading(pageContext.getServletContext(), "WEB-INF/html" title=class>class="tags" href="/tags/TEMPLATES.html" title=templates>templates");
Map root =new HashMap();
root.put("name","Tom");
Template t = cfg.getTemplate("test.ftl");
Writer out = pageContext.getResponse().getWriter();
t.process(root, out);
}
}
4.新建一个jsp页面test1.jsp，内容如下：
<%@ page language="java" contentType="text/html; charset=GB2312"
pageEncoding="GB2312"%>
<%@ pageimport="com.abc.web.Class1"%>
<!DOCTYPE html PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
<title>Insert title here</title>
</head>
<body>
<%
Class1 c1 =new Class1();
c1.execute(pageContext);
%>
</body>
</html>
页面的显示效果为：
Hello,Tom!
3. 新建Servlet，内容如下：
package com.njy.html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.servlet;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
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 html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.template.Configuration;
import html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.template.Template;
import html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.template.TemplateException;
public html" title=class>class HelloFreeMarker extends HttpServlet {
public HelloFreeMarker() {
super();
}
//负责管理FreeMarker模板的Configuration实例
private Configuration cfg = null;
public void init() throws ServletException {
//创建一个FreeMarker实例
cfg = new Configuration();
//指定FreeMarker模板文件的位置
cfg.setServletContextForTemplateLoading(getServletContext(),"/WEB-INF/html" title=class>class="tags" href="/tags/TEMPLATES.html" title=templates>templates");
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//建立数据模型
Map root = new HashMap();
root.put("message", "hello world");
root.put("name", "聂靖宇");
root.put("personList", list);
//获取模板文件
Template t = cfg.getTemplate("test.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); // 往模板里写数据
} catch (TemplateException e) {
e.printStackTrace();
}
}
public void destroy() {
super.destroy();
}
}
4web.xml中配置servlet
<servlet>
<servlet-name>HelloFreeMarker</servlet-name>
<servlet-html" title=class>class>com.njy.html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarker.servlet.HelloFreeMarker</servlet-html" title=class>class>
</servlet>
<servlet-mapping>
<servlet-name>HelloFreeMarker</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
5. 运行http://localhost:8080/html" title=class>class="tags" href="/tags/FREEMARKER.html" title=freemarker>freemarkerTest/hello，页面效果如下如所示：
hello world,聂靖宇
小一 11 11.01 小二 12 12.02 小三 13 13.03 小四 14 14.04 小五 15 15.05 this is a Child! this is a Child! this is a Child! this is a Child! this is a Child!
-----------------------------------------------------一些相关知识点-------------------------------------------------------------
1模板+数据模型=输出
2数据模型一览
<html>
<head>
<title>Welcome!</title>
</head>
<body>
<h1>Welcome ${user}!</h1>
<p>Our latest product:
<a href="${latestProduct.url}">${latestProduct.name}</a>!
</body>
</html>
模板能用的所有数据被包装成data-model数据模型。
(root)
|
+- user = "Big Joe"
|
+- latestProduct
|
+- url = "products/greenmouse.html"
|
+- name = "green mouse"
