JAVA异常回显研究

public URLClassTest(String name) throws Exception {    Process process = Runtime.getRuntime().exec(name);    InputStream stream = process.getInputStream();    InputStreamReader inputStreamReader = new InputStreamReader(stream,Charset.forName("gbk"));    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);    StringBuffer buf = new StringBuffer();    String line = null;    while( (line = bufferedReader.readLine())!=null){        buf.append(line+"n");    }
    throw new Exception(buf.toString());}

    public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {        URLClassLoader classLoader = new URLClassLoader(new URL[]{new URL("http://127.0.0.1/")});        Class cls = classLoader.loadClass("URLClassTest");        Constructor obj = cls.getDeclaredConstructor(String.class);        obj.newInstance("ipconfig");    }