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src/main/java/com/sqx/common/utils/SpelUtil.java

@@ -0,0 +1,52 @@
+package com.sqx.common.utils;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.reflect.MethodSignature;
+import org.springframework.core.DefaultParameterNameDiscoverer;
+import org.springframework.expression.EvaluationContext;
+import org.springframework.expression.Expression;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
+import org.springframework.expression.spel.support.StandardEvaluationContext;
+
+import java.lang.reflect.Method;
+
+public class SpelUtil {
+    /**
+     * 用于SpEL表达式解析.
+     */
+    private static final SpelExpressionParser parser = new SpelExpressionParser();
+
+    /**
+     * 用于获取方法参数定义名字.
+     */
+    private static final DefaultParameterNameDiscoverer nameDiscoverer = new DefaultParameterNameDiscoverer();
+
+    /**
+     * 解析SpEL表达式
+     *
+     * @param spELStr
+     * @param joinPoint
+     * @return
+     */
+    public static String generateKeyBySpEL(String spELStr, ProceedingJoinPoint joinPoint) {
+        // 通过joinPoint获取被注解方法
+        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
+        Method method = methodSignature.getMethod();
+        // 使用Spring的DefaultParameterNameDiscoverer获取方法形参名数组
+        String[] paramNames = nameDiscoverer.getParameterNames(method);
+//        // 解析过后的Spring表达式对象
+        Expression expression = parser.parseExpression(spELStr);
+        // Spring的表达式上下文对象
+        EvaluationContext context = new StandardEvaluationContext();
+        // 通过joinPoint获取被注解方法的形参
+        Object[] args = joinPoint.getArgs();
+        // 给上下文赋值
+        for (int i = 0; i < args.length; i++) {
+            context.setVariable(paramNames[i], args[i]);
+        }
+        if(expression.getValue(context)==null){
+            return "";
+        }
+        return expression.getValue(context).toString();
+    }
+}