javaassist动态构造一个Class

package com.zhangxueliang.demo;

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.CtNewMethod;
import javassist.NotFoundException;

/**
 * 动态构造一个Class
 * @author 张学亮
 *
 */
public class JavassistDemo {

    public static void main(String[] args) throws CannotCompileException, IOException, NotFoundException {

        ClassPool pool = ClassPool.getDefault();

        //定义类
        CtClass stuClass = pool.makeClass("com.zhangxueliang.Student");

        //加载类
//      CtClass cc =  pool.get(classname);

        //id属性
        CtField idField = new CtField(CtClass.longType, "id", stuClass);
        stuClass.addField(idField);

        //name属性
        CtField nameField = new CtField(pool.get("java.lang.String"), "name", stuClass);
        stuClass.addField(nameField);

        //age属性
        CtField ageField = new CtField(CtClass.intType, "age", stuClass);
        stuClass.addField(ageField);

        CtMethod getMethod = CtNewMethod.make("public int getAge() { return this.age;}", stuClass);
        CtMethod setMethod = CtNewMethod.make("public void setAge(int age) { this.age = age;}", stuClass);

        stuClass.addMethod(getMethod);
        stuClass.addMethod(setMethod);

        stuClass.writeFile("e:\\Practice_Demo");

        Class<?> clazz = stuClass.toClass();
        System.out.println("class:"+clazz.getName());

        System.out.println("------------属性列表------------");
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            System.out.println(field.getType()+"\t"+field.getName());
        }

        System.out.println("------------方法列表------------");
        //方法
        Method[] methods = clazz.getDeclaredMethods();
        for (Method method: methods){
            System.out.println(method.getReturnType()+"\t"+method.getName()+"\t"+Arrays.toString(method.getParameterTypes()));
        }

    }

}