java-admin/src/test/java/com/rui/pro1/vail/ssist/Main.java at dev · lwh-java/java-admin

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package com.rui.pro1.vail.ssist;

//import java.lang.annotation.Annotation;

import java.util.Set;

import javassist.ClassPool;

import javassist.CtClass;

import javassist.CtField;

import javassist.CtMethod;

import javassist.NotFoundException;

import javassist.bytecode.AnnotationsAttribute;

import javassist.bytecode.FieldInfo;

import javassist.bytecode.MethodInfo;

import javassist.bytecode.annotation.Annotation;

import javassist.bytecode.annotation.StringMemberValue;

import org.hibernate.validator.constraints.Length;

import org.junit.Test;

public class Main {

public static void main(String[] args) {

System.out.println("ddd");

}

@Test

public void ReadTest() throws NotFoundException{

ClassPool pool = ClassPool.getDefault();

//获取要修改的类的所有信息

CtClass ct = pool.get("com.rui.pro1.vail.ssist.CollectionBase");

//获取类中的方法

CtMethod[] cms = ct.getDeclaredMethods();

//获取第一个方法（因为只有一个方法）

CtMethod cm = cms[0];

System.out.println("方法名称====" + cm.getName());

//获取方法信息

MethodInfo methodInfo = cm.getMethodInfo();

//获取类里的em属性

CtField cf = ct.getField("em");

//获取属性信息

FieldInfo fieldInfo = cf.getFieldInfo();

System.out.println("属性名称===" + cf.getName());

//获取注解属性

AnnotationsAttribute attribute = (AnnotationsAttribute) fieldInfo.getAttribute(AnnotationsAttribute.visibleTag);

System.out.println("attribute:"+attribute);

//获取注解

Annotation annotation = attribute.getAnnotation("org.hibernate.validator.constraints.Length");

System.out.println("annotation:"+annotation);

//获取注解的值

Set set=annotation.getMemberNames();

System.out.println(set);

String text =((StringMemberValue) annotation.getMemberValue("max")).getValue() ;

System.out.println("注解名称===" + text);

}

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