表达式语法

简单表达式语法

#{...} : Message 表达式

<p th:utext="#{home.welcome(${session.user.name})}"> Welcome to our grocery store, Sebastian Pepper!</p>
<p th:utext="#{${welcomeMsgKey}(${session.user.name})}"> Welcome to our grocery store, Sebastian Pepper!</p>

${} : 变量表达式

ongl 标准语法，方法也可以被调用

*{} : 选择变量表达式

<div th:object="${session.user}">
    <p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
    <p>Surname: <span th:text="*{lastName}">Pepper</span>.</p> 
    <p>Nationality: <span th:text={nationality}">Saturn</span>.</p>
</div> 
等价于
<div>
    <p>Name: <span th:text="${session.user.firstName}">Sebastian</span>.</p> 
    <p>Surname: <span th:text="${session.user.lastName}">Pepper</span>.</p> 
    <p>Nationality: <span th:text="${session.user.nationality}">Saturn</span>.</p>
</div>
当然了，这两者可以混合使用
还有一种方式
<div>
    <p>Name: <span th:text="*{session.user.name}">Sebastian</span>.</p> 
    <p>Surname: <span th:text="*{session.user.surname}">Pepper</span>.</p> 
    <p>Nationality: <span th:text="*{session.user.nationality}">Saturn</span>.</p>
</div>

@{} : 链接 URL 表达式

<!-- Will produce 'http://localhost:8080/gtvg/order/details?orderId=3' (plus rewriting) --> <a href="details.html"

th:href="@{http://localhost:8080/gtvg/order/details(orderId=${o.id})}">view</a> <!-- Will produce '/gtvg/order/details?orderId=3' (plus rewriting) -->

<a href="details.html" th:href="@{/order/details(orderId=${o.id})}">view</a>

<!-- Will produce '/gtvg/order/3/details' (plus rewriting) -->

<a href="details.html" th:href="@{/order/{orderId}/details(orderId=${o.id})}">view</a>

变量

字符连接

算数运算

真假运算

比较运算

条件运算

综合示例

'User is of type ' + (${user.isAdmin()} ? 'Administrator' : (${user.type} ?: 'Unknown'))