SpElUtil.java
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package cn.iocoder.dashboard.util.sping;
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 {
private SpElUtil() {
}
public static String analysisSpEl(String spElString, ProceedingJoinPoint joinPoint) {
SpelExpressionParser parser = new SpelExpressionParser();
DefaultParameterNameDiscoverer nameDiscoverer = new DefaultParameterNameDiscoverer();
// 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(spElString);
// 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]);
}
Object value = expression.getValue(context);
return value == null ? "null" : value.toString();
}
}