YunaiV
5 years ago
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e65488265d
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package cn.iocoder.dashboard.util.sping;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.core.DefaultParameterNameDiscoverer;
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import org.springframework.expression.EvaluationContext;
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import org.springframework.expression.Expression;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* SpEl解析类
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*
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* @author mashu
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*/
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public class SpElUtil {
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private static SpelExpressionParser parser = new SpelExpressionParser();
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private static DefaultParameterNameDiscoverer nameDiscoverer = new DefaultParameterNameDiscoverer();
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private SpElUtil() {
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}
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/**
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* 解析切面SpEL
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*
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* @param spElString 表达式
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* @param joinPoint 切面点
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* @return 执行界面
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*/
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public static Object analysisSpEl(String spElString, ProceedingJoinPoint joinPoint) {
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// 通过joinPoint获取被注解方法
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MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
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Method method = methodSignature.getMethod();
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// 使用spring的DefaultParameterNameDiscoverer获取方法形参名数组
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String[] paramNames = nameDiscoverer.getParameterNames(method);
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// 解析过后的Spring表达式对象
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Expression expression = parser.parseExpression(spElString);
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// spring的表达式上下文对象
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EvaluationContext context = new StandardEvaluationContext();
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// 通过joinPoint获取被注解方法的形参
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Object[] args = joinPoint.getArgs();
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// 给上下文赋值
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for (int i = 0; i < args.length; i++) {
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context.setVariable(paramNames[i], args[i]);
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}
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return expression.getValue(context);
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}
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/**
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* 批量解析切面SpEL
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*
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* @param spElStrings 表达式
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* @param joinPoint 切面点
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* @return 执行界面
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*/
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public static Map<String, Object> analysisSpEls(List<String> spElStrings, ProceedingJoinPoint joinPoint) {
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if (null == spElStrings) {
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return null;
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}
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Map<String, Object> resultMap = new HashMap<>(spElStrings.size());
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spElStrings.forEach(expression -> resultMap.put(expression, analysisSpEl(expression, joinPoint)));
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return resultMap;
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}
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}
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