thymeleaf 基本对象

心已赠人 2022-11-26 07:47 186阅读 0赞

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### thymeleaf 基本对象 ###

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**\#ctx：上下文对象**

**thymeleaf  context：\#ctx 是IContext 对象引用**

public interface IContext {
        Locale getLocale();
    
        boolean containsVariable(String var1);
    
        Set<String> getVariableNames();
        Object getVariable(String var1);
    }
    
    
    **********
    #ctx 使用
    
    ${#ctx.locale}
    ${#ctx.varableNames}

**thymeleaf web context：\#ctx 是 IWebContext 对象引用**

public interface IWebContext extends IContext {
    
        HttpServletRequest getRequest();
        HttpServletResponse getResponse();
    
        HttpSession getSession();
        ServletContext getServletContext();
    }
    
    
    ************
    #ctx 使用
    
    ${#ctx.request}
    ${#ctx.response}
    ${#ctx.session}
    ${#ctx.servletContext}

**说明：\#vars、\#root 与 \#ctx 作用相似，推荐使用 \#ctx**

**\#locale：java.util.Locale 对象引用**

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**param、session、application**

**WebEngineContext**

public class WebEngineContext extends AbstractEngineContext implements IEngineContext, IWebContext {
        private static final String PARAM_VARIABLE_NAME = "param";
        private static final String SESSION_VARIABLE_NAME = "session";
        private static final String APPLICATION_VARIABLE_NAME = "application";
        private final HttpServletRequest request;
        private final HttpServletResponse response;
        private final HttpSession session;
        private final ServletContext servletContext;
        private final WebEngineContext.RequestAttributesVariablesMap requestAttributesVariablesMap;
        private final Map<String, Object> requestParametersVariablesMap;
        private final Map<String, Object> sessionAttributesVariablesMap;
        private final Map<String, Object> applicationAttributesVariablesMap;

**说明：**web 环境中，**param、session、application**以 **map 的形式**存储到**WebEngineContext**中

**param ==> requestParametersVariablesMap**

${param.foo}                  //请求参数foo对应的value
    ${param.size()}               //请求参数的个数
    ${param.isEmpty()}            //请求参数是否为空
    ${param.containsKey('foo')}   //请求参数中是否含有名为foo的参数
    
    ...

**session** **==> sessionAttributesVariablesMap**

${session.foo}                 //获取session中key：foo的属性值
    ${session.size()}              //session中键值对个数
    ${session.isEmpty()}           //session中是否含有键值对
    ${session.containsKey('foo')}  //session中是否含有key：foo的键值对
    
    ...

**application** **==>** **applicationAttributesVariablesMap**

${application.foo}                //application 中key：foo的属性值
    ${application.size()}             //application中存储的键值对的个数
    ${application.isEmpty()}          //application中是否存储键值对
    ${application.containsKey('foo')} //application中是否含有key为foo的键值对
    
    ...

**注意：param、session、application使用时没有 \#**

### \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ###

**\#request、\#session、\#servletContext**

**\#request：javax.servlet.http.HttpServletRequest 对象引用**

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

**\#session：javax.servlet.http.HttpSession 对象引用**

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

**\#servletContext：javax.servlet.ServletContext**

${#servletContext.getAttribute('foo')}
    ${#servletContext.contextPath}
    
    ...