Thymeleaf教程 （十三） 附件：基础对象和web参数访问方式。

基础对象

#ctx :ctx对象继承org.thymeleaf.context.IContext或者org.thymeleaf.context.IWebContext，取决于当前环境是不是web环境。如果程序集成了spring，那么将会是org.thymeleaf.spring[3|4].context.SpringWebContext。

/*
* ======================================================================
* See javadoc API for class org.thymeleaf.context.IContext
* ======================================================================
*/
${#ctx.locale}
${#ctx.variables}
/*
* ======================================================================
* See javadoc API for class org.thymeleaf.context.IWebContext
* ======================================================================
*/
${#ctx.applicationAttributes}
${#ctx.httpServletRequest}
${#ctx.httpServletResponse}
${#ctx.httpSession}
${#ctx.requestAttributes}
${#ctx.requestParameters}
${#ctx.servletContext}
${#ctx.sessionAttributes}

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#locale：java.util.Locale对象的访问. 

#vars :org.thymeleaf.context的实例。访问VariablesMap所有上下文中的变量（包含本笃和ctx.variables中的）。

/*
* ======================================================================
* See javadoc API for class org.thymeleaf.context.VariablesMap
* ======================================================================
*/
${#vars.get('foo')}
${#vars.containsKey('foo')}
${#vars.size()}

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web环境中访问request/session等属性

当在web环境中使用Thymeleaf,我们可以使用一系列的快捷方式访问请求的参数,会话和应用程序的属性. 

param :获取请求的参数.

/*
* ============================================================================
* See javadoc API for class org.thymeleaf.context.WebRequestParamsVariablesMap
* ============================================================================
*/
${param.foo} // Retrieves a String[] with the values of request parameter 'foo'
${param.size()}
${param.isEmpty()}
${param.containsKey('foo')}
...

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session:访问session属性。

/*
* ======================================================================
* See javadoc API for class org.thymeleaf.context.WebSessionVariablesMap
* ======================================================================
*/
${session.foo} // Retrieves the session atttribute 'foo'
${session.size()}
${session.isEmpty()}
${session.containsKey('foo')}
...

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application：获取应用程序/ servlet上下文属性。

/*
* =============================================================================
* See javadoc API for class org.thymeleaf.context.WebServletContextVariablesMap
* =============================================================================
*/
${application.foo} // Retrieves the ServletContext atttribute 'foo'
${application.size()}
${application.isEmpty()}
${application.containsKey('foo')}
...

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web环境对象

#httpServletRequest :javax.servlet.http.HttpServletRequest对象实例。

${#httpServletRequest.getAttribute('foo')}
${#httpServletRequest.getParameter('foo')}
${#httpServletRequest.getContextPath()}
${#httpServletRequest.getRequestName()}
...

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#httpSession：javax.servlet.http.HttpSession实例。

${#httpSession.getAttribute('foo')}
${#httpSession.id}
${#httpSession.lastAccessedTime}
...

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spring环境对象

#themes : 提供和“ spring:theme JSP tag.”同样的功能。

${#themes.code('foo')}

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直接访问spring注册对象

<div th:text="${@authService.getUserName()}">...</div>