我试图实时生成一些类,下面是我的初步尝试:java的帮助新手的问题
ClassPool cp = ClassPool.getDefault();
cp.insertClassPath(new ClassClassPath(Main.class));
CtClass entity = cp.makeClass("Entity");
try {
CtField id = new CtField(CtClass.intType, "id", entity);
entity.addField(id);
entity.addField(CtField.make(" public String name;", entity));
entity.addMethod(CtNewMethod.make("public void say() { System.out.println(12222);}",entity));
Class EntityClass = entity.toClass();
entity.writeFile("/tmp");
Object e= EntityClass.newInstance();
Field name = EntityClass.getField("name");
name.set("Ooldooz", e);
System.out.println(name.get(e));
} catch (CannotCompileException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
但我面临一个类加载器的问题:
在线程异常“main”java.lang.IllegalArgumentException:无法将java.lang.String字段Entity.name设置为java.lang.String at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146) at sun.reflect.UnsafeFieldAccessorImpl .throwSetIllegalArgumentExc主器件接收(UnsafeFieldAccessorImpl.java:150) 在sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37) 在sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:57) 在java.lang.reflect.Field中。设置(Field.java:657) 在Main.test(Main.java:26)
有关如何解决此问题的任何想法?