java擷取class的幾種方式

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以擷取Hello.class為例

public class Hello {    public static void main(String[] args) {        // TODO Auto-generated method stub        System.out.println("tes22t2");        for (String arg : args)        {            System.out.println("hello proms：" + arg);        }    }}

1.反射

public static void main(String[] args) throws Exception    {        args = new String[]{"Hello","java瘋狂講義w"};        String progClass = args[0];        String[] progArgs = new String[args.length-1];        System.arraycopy(args , 1 , progArgs, 0 , progArgs.length);//        URL[] urls = {new URL("file:")};//        Class<?> clazz = (new URLClassLoader(urls)).loadClass(progClass);        Class<?> clazz = Class.forName(progClass);        // 擷取需要啟動並執行類的主方法        Method main = clazz.getMethod("main" , (new String[0]).getClass());        Object[] argsArray = {progArgs};        main.invoke(null,argsArray);    }

2.URLClassLoader

URL[] urls = {new URL("file:")};Class<?> clazz = (new URLClassLoader(urls)).loadClass(progClass);

3.loadClass

CompileClassLoader ccl = new CompileClassLoader();// 載入需要啟動並執行類Class<?> clazz = ccl.loadClass(progClass);

4.覆寫findClass

參考

java8--類載入機制與反射(java瘋狂講義3複習筆記)　　

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

java擷取class的幾種方式