[英]Loading a class with custom ClassLoader without using a String
I have created a custom ClassLoader and want to load a class. 我创建了一个自定义的ClassLoader,并希望加载一个类。 I am using this code at the moment to load the class from the Jar:
我现在正在使用此代码从Jar中加载类:
ByteArrayInputStream byteIS = new ByteArrayInputStream(data);
JarInputStream jarIS = new JarInputStream(byteIS);
JarEntry je;
je = jarIS.getNextJarEntry();
byte[] classbytes = new byte[(int) je.getSize()];
jarIS.read(classbytes, 0, classbytes.length);
jarIS.close();
CustomClassLoader classLoader = new CustomClassLoader();
classLoader.setClassContent(classbytes);
Class c = classLoader.findClass("Main");
Object object = c.newInstance();
Method[] methods = object.getClass().getMethods();
Object returnValue = methods[0].invoke(null, new Object[]{new String[]{}});
In this sample above you can clearly see I am trying to load class Main. 在上面的示例中,您可以清楚地看到我正在尝试加载Main类。 Now imagine that my friend also creates a Jar, I cannot know on beforehand what the name of the class is.
现在想象一下,我的朋友也创建了一个Jar,我事先无法知道类的名称。 How can I avoid the usage of a String as argument?
如何避免将String用作参数?
You might want to have a look at the ServiceLoader API . 您可能需要看一下ServiceLoader API 。 You can define a common interface for service implementations (classes) that you don't know a priori .
您可以为您不知道先验的服务实现(类)定义一个通用接口。
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