扩展：FreeMarker渲染引擎

  1. /**
  2.  * Freemarker 渲染器
  3.  * @version : 2016年1月3日
  4.  * @author 赵永春 (zyc@hasor.net)
  5.  */
  6. @Render("flt")
  7. public class FreemarkerRender implements RenderEngine {
  8.     protected Configuration freemarker;
  9.     //
  10.     /** 内置创建 Freemarker 对象的方法，您也可以通过 apiBinder.bind(Configuration.class).... 来设置您自定义的。 */
  11.     protected Configuration newConfiguration(AppContext appContext, ServletContext servletContext) throws IOException {
  12.         //
  13.         String realPath = servletContext.getRealPath("/");
  14.         TemplateLoader templateLoader = new FileTemplateLoader(new File(realPath), true);
  15.         Configuration configuration = new Configuration(Configuration.VERSION_2_3_22);
  16.         configuration.setTemplateLoader(templateLoader);
  17.         //
  18.         String responseEncoding = appContext.findBindingBean(RuntimeFilter.HTTP_RESPONSE_ENCODING_KEY, String.class);
  19.         if (StringUtils.isBlank(responseEncoding)) {
  20.             responseEncoding = Settings.DefaultCharset;
  21.         }
  22.         configuration.setDefaultEncoding(responseEncoding);
  23.         configuration.setOutputEncoding(responseEncoding);
  24.         configuration.setLocalizedLookup(false);//是否开启国际化false
  25.         configuration.setClassicCompatible(true);//null值测处理配置
  26.         //
  27.         return configuration;
  28.     }
  29.     /** 各种工具&变量 */
  30.     protected void configSharedVariable(AppContext appContext, ServletContext servletContext, Configuration freemarker) throws TemplateModelException {
  31.         freemarker.setSharedVariable("stringUtils", new StringUtils());
  32.         freemarker.setSharedVariable("ctx_path", servletContext.getContextPath());
  33.     }
  34.     public void initEngine(AppContext appContext) throws Throwable {
  35.         ServletContext servletContext = Hasor.assertIsNotNull(appContext.getInstance(ServletContext.class));
  36.         BindInfo<Configuration> bindInfo = appContext.getBindInfo(Configuration.class);
  37.         if (bindInfo == null) {
  38.             this.freemarker = this.newConfiguration(appContext, servletContext);
  39.         } else {
  40.             this.freemarker = appContext.getInstance(bindInfo);
  41.         }
  42.         this.configSharedVariable(appContext, servletContext, Hasor.assertIsNotNull(this.freemarker));
  43.     }
  44.     public boolean exist(String template) throws IOException {
  45.         return this.freemarker.getTemplateLoader().findTemplateSource(template) != null;
  46.     }
  47.     public void process(RenderInvoker renderData, Writer writer) throws Throwable {
  48.         Template temp = this.freemarker.getTemplate(renderData.renderTo());
  49.         if (temp == null) {
  50.             return;
  51.         }
  52.         HashMap<String, Object> data = new HashMap<>();
  53.         for (String key : renderData.keySet()) {
  54.             data.put(key, renderData.get(key));
  55.         }
  56.         temp.process(data, writer);
  57.     }
  58. }