第十一节:Thymeleaf内置对象

一：基础对象
1.ctx: the context object 
    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
    #org.thymeleaf.context.IContext
    ${#ctx.locale}
    ${#ctx.variables}
    #org.thymeleaf.context.IWebContext
    ${#ctx.applicationAttributes}
    ${#ctx.httpServletRequest}
    ${#ctx.httpServletResponse}
    ${#ctx.httpSession}
    ${#ctx.requestAttributes}
    ${#ctx.requestParameters}
    ${#ctx.servletContext}
    ${#ctx.sessionAttributes}
2.vars: the context variables
    访问VariablesMap所有上下文中的变量
    #org.thymeleaf.context.VariablesMap
    ${#vars.get('foo')}
    ${#vars.containsKey('foo')}
    ${#vars.size()}
3.locale: the context locale
    java.util.Locale对象的访问
4.request: (only in Web Contexts) the HttpServletRequest object
5.response: (only in Web Contexts) the HttpServletResponse object
6.session: (only in Web Contexts) the HttpSession object(需要contoller/action(HttpSession session))
7.servletContext: (only in Web Contexts) the ServletContext object
二：web环境对象
1.#httpServletRequest :javax.servlet.http.HttpServletRequest对象实例
    ${#httpServletRequest.getAttribute('foo')}
    ${#httpServletRequest.getParameter('foo')}
    ${#httpServletRequest.getContextPath()}
    ${#httpServletRequest.getRequestName()}
2.#httpSession(需要contoller/action(HttpSession session))
    ${#httpSession.getAttribute('foo')}
    ${#httpSession.id}
    ${#httpSession.lastAccessedTime}
三：spring环境对象
    #themes : 提供和“ spring:theme JSP tag.”同样的功能。
    ${#themes.code('foo')}
四：web环境中访问request/session等属性
    1.param :获取请求的参数.
        ${param.foo} // Retrieves a String[] with the values of request parameter 'foo'
        ${param.size()}
        ${param.isEmpty()}
        ${param.containsKey('foo')}
    2.session:访问session属性
        ${session.foo} // Retrieves the session atttribute 'foo'
        ${session.size()}
        ${session.isEmpty()}
        ${session.containsKey('foo')}
    3.application：获取应用程序/ servlet上下文属性
        ${application.foo} // Retrieves the ServletContext atttribute 'foo'
        ${application.size()}
        ${application.isEmpty()}
        ${application.containsKey('foo')}
五：直接访问spring注册对象
    <div th:text="${@authService.getUserName()}">... 
六：示例

示例，浏览输出结果： CN 0 /ysfy