举例，方法get(String name, long id)，目的想获得name，id这两个名称：
初衷：做日志拦截的时候，比如拦截了方法get(String name, long id)，想在日志表中记录成姓名：admin，主键：123，
就需要获取方法的参数名称，以便将参数名称翻译成对应的中文名，比如name对应姓名，id对应主键
package cn.sniper.reflect.utils;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.concurrent.locks.ReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;import javassist.ClassClassPath;import javassist.ClassPool;import javassist.CtClass;import javassist.CtMethod;import javassist.Modifier;import javassist.NotFoundException;import javassist.bytecode.CodeAttribute;import javassist.bytecode.LocalVariableAttribute;import javassist.bytecode.MethodInfo;import com.audaque.webkit.web.action.IndexAction;public class ReflectUtil { private static final Map > PARAM_MAP = new HashMap >(); private static final ReadWriteLock RWL = new ReentrantReadWriteLock(); private static final ClassPool CLASS_POOL = ClassPool.getDefault(); static { //解决javassist.NotFoundException报错 CLASS_POOL.insertClassPath(new ClassClassPath(IndexAction.class)); } /** * 拿到方法的参数名称 * 比如get(long id, String name) * 获得id, name */ public static List getParamNameList(Class clazz, String methodName) { RWL.readLock().lock(); List paramNameList = PARAM_MAP.get(clazz.getName()+"-"+methodName); try { if(paramNameList == null || paramNameList.size() <= 0) { try { RWL.readLock().unlock(); RWL.writeLock().lock(); if(paramNameList == null || paramNameList.size() <= 0) { try { paramNameList = new ArrayList (); CtClass cc = CLASS_POOL.get(clazz.getName()); CtMethod cm = cc.getDeclaredMethod(methodName); // 使用javaassist的反射方法获取方法的参数名 MethodInfo methodInfo = cm.getMethodInfo(); CodeAttribute codeAttribute = methodInfo.getCodeAttribute(); LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag); if (attr != null) { int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1; for (int i = 0; i < cm.getParameterTypes().length; i++) { paramNameList.add(attr.variableName(i + pos)); } } } catch (NotFoundException e) { e.printStackTrace(); } PARAM_MAP.put(clazz.getName()+"-"+methodName, paramNameList); } } finally { RWL.writeLock().unlock(); RWL.readLock().lock(); } } } finally { RWL.readLock().unlock(); } return paramNameList; } }