利用classloader生成class的方法

1：无参数构造体

public static Object create(String className) throws ClassLoadException {

        Object object = null;

        Thread t = Thread.currentThread();
        ClassLoader cl = t.getContextClassLoader();

        try {
            object = cl.loadClass(className).newInstance();

        } catch (InstantiationException e) {
            throw new ClassLoadException(e);
        } catch (IllegalAccessException e) {
            throw new ClassLoadException(e);
        } catch (ClassNotFoundException e) {
            throw new ClassLoadException(e);
        }
        return object;
    }

2：有参数的构造方法

public static Object create(String className,
                                 Object[] constructorParameter)
                                 throws ClassLoadException {

        Constructor[] constructors = null;

        Thread t = Thread.currentThread();
        ClassLoader cl = t.getContextClassLoader();

        try {
            constructors = cl.loadClass(className).getConstructors();
        } catch (SecurityException e) {
            throw new ClassLoadException(e);
        } catch (ClassNotFoundException e) {
            throw new ClassLoadException(e);
        }

        for (int i = 0; i < constructors.length; i++) {

            Object object = null;

            try {
             object = constructors[i].newInstance(constructorParameter);
            } catch (IllegalArgumentException e) {
                continue;
            } catch (InstantiationException e) {
                throw new ClassLoadException(e);
            } catch (IllegalAccessException e) {
                throw new ClassLoadException(e);
            } catch (InvocationTargetException e) {
                throw new ClassLoadException(e);
            }

              if (object != null) {
                return object;
            }

        }

        throw new ClassLoadException(
            new IllegalArgumentException("class name is " + className));
    }