javaassist指定父类及List复杂属性生成

曾经终败给现在 2023-10-07 08:45 2阅读 0赞

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.NotFoundException;
    
    /**
     * 指定父类及List复杂属性生成
     * @author 张学亮
     */
    public class JavassistExtendDemo {
    
        public static void main(String[] args) throws CannotCompileException, IOException, NotFoundException {
    
            ClassPool pool = ClassPool.getDefault();
    
            //定义类
            CtClass stuClass = pool.makeClass("com.zhangxueliang.Student");
    
            //设置父类
            stuClass.setSuperclass(pool.get("com.zhangxueliang.demo.JavassistTest"));
    
            //hobbies属性
            CtField hobbiesField = new CtField(pool.getCtClass("java.util.List"), "hobbies", stuClass);
            stuClass.addField(hobbiesField);
    
            stuClass.writeFile("e:/");
    
            //反射操作
            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.getMethods();
            for (Method method: methods){
                System.out.println(method.getReturnType()+"\t"+method.getName()+"\t"+Arrays.toString(method.getParameterTypes()));
            }
    
        }
    
    }