使用javassist生成一个类

package com.kang.javasis;

import javassist.*;

import java.io.IOException;

/**
 * @author klr
 * @create 2020-09-25-10:07
 */
public class Test {
    public static void main(String[] args) throws CannotCompileException, NotFoundException, IOException {
        ClassPool pool = ClassPool.getDefault();
        //创建类
        CtClass ctClass = pool.makeClass("com.kang.mybatis.proxy.User");
        //创建属性
        CtField f1 = CtField.make("private int num;", ctClass);
        CtField f2 = CtField.make("private String test;", ctClass);
        ctClass.addField(f1);
        ctClass.addField(f2);

        //创建方法
        CtMethod setName = CtMethod.make("public void setName(String test){this.test=test;}", ctClass);
        CtMethod getName = CtMethod.make("public String getName(){return test;}", ctClass);
        ctClass.addMethod(setName);
        ctClass.addMethod(getName);


        CtConstructor ctConstructor = new CtConstructor(new CtClass[]{CtClass.intType, pool.get("java.lang.String")}, ctClass);
        ctConstructor.setBody("{this.num=$1;this.test=$2;}");
        ctClass.addConstructor(ctConstructor);
        ctClass.writeFile("C:/nettyy/src/main/java/com/kang/javasis");
        System.out.println("生成成功");


    }
}