java获取方法的参数名

java获取方法的参数名

Java  /  管理员 发布于 2021-04-30 16:44:51   29

reflect.ClassInformationUtil.java

package reflect;import javassist.ClassPool;import javassist.CtClass;import javassist.CtMethod;import javassist.Modifier;import javassist.bytecode.CodeAttribute;import javassist.bytecode.LocalVariableAttribute;import javassist.bytecode.MethodInfo;import velocity.VelocityUtil;public class ClassInformationUtil {    public static void printMethodInfo(Class<?> clazz) {        try {            ClassPool pool = ClassPool.getDefault();            CtClass cc = pool.get(clazz.getName());            CtMethod[] cms = cc.getDeclaredMethods();            for (CtMethod cm : cms) {                System.out.println("--------------------");                System.out.println("method name is :"+cm.getName());                MethodInfo methodInfo = cm.getMethodInfo();                CodeAttribute codeAttribute = methodInfo.getCodeAttribute();                LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);                if (attr == null) {                    System.err.println("attr is null");                    continue;                }                int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;                for (int i = 0; i < cm.getParameterTypes().length; i++) {                    String parameterName = attr.variableName(i+pos);                    System.out.print(parameterName+" ");                }                System.out.println();            }        } catch (Exception e) {            throw new RuntimeException(e);        }    }}

 

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>Document</groupId>    <artifactId>Document</artifactId>    <version>1.0-SNAPSHOT</version>    <dependencies>        <dependency>            <groupId>org.javassist</groupId>            <artifactId>javassist</artifactId>            <version>3.15.0-GA</version>        </dependency>    </dependencies></project>