freemarker 異常處理

SSH2處理方案：

freemarker文件如果出錯，網站的前臺頁面會報出很明顯的錯誤-焦黃的背景，血紅的文字，很不利于用戶體驗的。如何修改這個問題呢？
首先需要在struts.xml配置文件里添加下面一行代碼：

1	<constant name="struts.freemarker.manager.classname" value="net.swiftlet.freemarker.MyFreemarkerManager" />

接著新建MyFreemarkerManager類，如下所示：

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public class MyFreemarkerManager extends org.apache.struts2.views.freemarker.FreemarkerManager { ????private static final Logger LOG = LoggerFactory.getLogger(MyFreemarkerManager.class); ????public void init(ServletContext servletContext) throws TemplateException ????{ ????????config = createConfiguration(servletContext); ????????config.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER); ????????contentType = DEFAULT_CONTENT_TYPE; ????????wrapper = createObjectWrapper(servletContext); ????????if (LOG.isDebugEnabled()) ????????{ ????????????LOG.debug("Using object wrapper of class " + wrapper.getClass().getName()); ????????} ????????config.setObjectWrapper(wrapper); ????????templatePath = servletContext.getInitParameter(INITPARAM_TEMPLATE_PATH); ????????if (templatePath == null) ????????{ ????????????templatePath = servletContext.getInitParameter("templatePath"); ????????} ????????configureTemplateLoader(createTemplateLoader(servletContext, templatePath)); ????????loadSettings(servletContext); ????} }

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SpringMVC-Freemarker異常配置

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1、spring mvc的異常配置

? ? spring mvc 提供了SimpleMappingExceptionResolver來處理異常，這里的只是由web 請求，經由controller引發的異常，無法處理freemarker的異常

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2、freemarker自定義異常

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/** ?*?freemarker頁面上的異常控制 ?*?在webmvc-config.xml里面的freemarkerSettings里頭配置 ?*?@author?scipio ?*?@created?2014-02-01 ?*/ public?class?FreemarkerExceptionHandler?implements?TemplateExceptionHandler?{ ????private?static?final?Logger?log?=?LoggerFactory ????????????.getLogger(FreemarkerExceptionHandler.class); ????public?void?handleTemplateException(TemplateException?te,?Environment?env, ????????????????????????????????????????Writer?out)?throws?TemplateException?{ ????????????log.warn("[Freemarker?Error:?"?+?te.getMessage()?+?"]"); ????????????throw?new?ViewException("freemarker?error",te); ????} }

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? 這里重新包裝異常拋出（這種方式要求比較嚴格，因為freemarker對個別的錯誤，比如某個變量沒有定義，可以忽略，只是后臺拋異常，然后整個頁面還是會渲染出來）

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3、配置HtmlFreeMarkerConfigurer

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?<bean?id="freemarkerConfig"?class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> ????????<property?name="templateLoaderPath"?value="/WEB-INF/views/"/> ????????<property?name="freemarkerSettings"> ????????????<props> ????????????????<prop?key="template_update_delay">0</prop> ????????????????<prop?key="default_encoding">UTF-8</prop> ????????????????<prop?key="locale">zh_CN</prop> ????????????????<prop?key="url_escaping_charset">UTF-8</prop> ????????????????<prop?key="whitespace_stripping">true</prop> ????????????????<prop?key="number_format">#</prop> ????????????????<!--?配置自定義的freemarker異常處理--> ????????????????<prop?key?=?"template_exception_handler">com.persia.exception.FreemarkerExceptionHandler</prop> ????????????</props> ????????</property> ????</bean>

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4、針對該異常，配置web.xml

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<!--配置freemarker異常--> ????<error-page> ????????<exception-type>com.persia.exception.ViewException</exception-type> ????????<location>/WEB-INF/views/error/viewException.ftl</location> ????</error-page>

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