用Freemarker生成静态HTML

配置

javaweb struts2 spring3 mybatis环境下配置

maven

<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
    <version>2.3.19</version>
</dependency>

web.xml设置servlet监听

<listener>
    <listener-class>com.ttianjun.listener.ContextListener</listener-class>
</listener>

对应的java类

public class ContextListener implements ServletContextListener{
    private static Log log = LogFactory.getLog(ContextListener.class);
    private static ApplicationContext springContext = null;
    private static ServletContext servletContext = null;
    public static ApplicationContext getContext(){
    return springContext;
    }
    @Override
    public void contextInitialized(ServletContextEvent sce){
        servletContext = sce.getServletContext();
        //用servlet上下文初始化freemarker工具
        FreeMarkerKit.init(servletContext);
        //spring 上下文
        springContext = WebApplicationContextUtils.getWebApplicationContext(servletContext); 
        //web工程名
        servletContext.setAttribute("ctx",  servletContext.getContextPath());    
    }
}

freemarker工具类书写

public class FreeMarkerKit {
    private static Log log = LogFactory.getLog(FreeMarkerKit.class);
    private static Configuration cfg;
    private static ServletContext servletContext;
    public static void init(ServletContext servletContext){
        FreeMarkerKit.servletContext = servletContext;
        cfg = new Configuration();

        // webapp/WEB-INF/templates 目录
        cfg.setServletContextForTemplateLoading(servletContext, "/WEB-INF/templates"); 

        cfg.setEncoding(Locale.getDefault(), "utf-8");
    }
    public static void CreateHtml(String ftl,String htmlName,Map<String,Object> param) throws  Exception{

        if(param==null) param = new HashMap<String,Object>();
        param.put("ctx", servletContext.getAttribute("ctx").toString());

        Template template = cfg.getTemplate(ftl);
        template.setEncoding("utf-8");

        // webapp/html 目录
        String path = servletContext.getRealPath("/html"); 
        File file = new File(path , htmlName);

        if(!file.exists())file.getParentFile().mkdir(); 

        Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), "utf-8"));
        template.process(param, writer);
        log.debug("生成静态文件:"+file.getAbsolutePath());
        writer.flush();
        writer.close();

    }
}

使用方法

index.ftl

welcome ${name}

调用

Map<String, Object> params = new HashMap<String, Object>();
params.put("name","ttianjun")
FreeMarkerKit.CreateHtml("index.ftl","index.html",params);