freemarker入门

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>

 

posted on 2016-07-20 20:08  肥兔子爱豆畜子  阅读(779)  评论(0)  编辑  收藏  举报

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