前言

• spring 5.0.6.RELEASE
• Thyemeleaf 3.0
• SpringBoot 2.3.4.RELEASE

Spring EL表達式 調用靜態類、靜態方法

參考這里：https://docs.spring.io/spring-framework/docs/5.0.6.RELEASE/spring-framework-reference/core.html#expressions-types

The special T operator can be used to specify an instance of java.lang.Class (the type). Static methods are invoked using this operator as well. The StandardEvaluationContext uses a TypeLocator to find types and the StandardTypeLocator (which can be replaced) is built with an understanding of the java.lang package. This means T() references to types within java.lang do not need to be fully qualified, but all other type references must be.

Class dateClass = parser.parseExpression("T(java.util.Date)").getValue(Class.class);Class stringClass = parser.parseExpression("T(String)").getValue(Class.class);boolean trueValue = parser.parseExpression("T(java.math.RoundingMode).CEILING < T(java.math.RoundingMode).FLOOR").getValue(Boolean.class);

Thyemeleaf 調用靜態類、靜態方法

官方給的說明：https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#variables

We already mentioned that ${…} expressions are in fact OGNL (Object-Graph Navigation Language) expressions executed on the map of variables contained in the context.
For detailed info about OGNL syntax and features, you should read the OGNL Language Guide
In Spring MVC-enabled applications OGNL will be replaced with SpringEL, but its syntax is very similar to that of OGNL (actually, exactly the same for most common cases).

根據官方說明，Thyemeleaf 表達式為OGNL，調用靜態類、靜態方法的辦法按照OGNL的辦法做即可。
在Spring MVC下，SpringEL 替換了 OGNL。那么，在Spring MVC下，調用靜態類、靜態方法的辦法按照SpringEL的辦法做即可。

Spring MVC/SpringBoot示例：

比如，shiro的用戶頭像這么輸出：

<img th:with="avatar=${T(org.apache.shiro.SecurityUtils).getSubject().getPrincipal().avatar}" th:src="@{${#strings.defaultString(avatar,'/images/user-head.jpg')}}" class="user-info" />

參考

https://www.cnblogs.com/XingXiaoMeng/p/11409625.html

總結

以上是生活随笔為你收集整理的【SpringBoot】【Thyemeleaf 】【Spring EL表达式】 SPEL调用静态类、静态方法的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。