探测简单的 rar 密码

密码格式：年月日（yyyyMMdd）

package org.demo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * 探测 rar 压缩包的密码
 * <p>
 * 针对密码格式为 yyyyMMdd 的 rar 压缩包，使用穷举法探测密码
 * <p>
 * 
 */
public class RarPasswordTest
{

    /**
     * 
     * 探测 rar 压缩包的密码，密码格式为：yyyyMMdd
     * 
     * @param args fileName startDate endDate
     * @throws Exception
     */
    public static void main(String[] args) throws Exception
    {
        String path = "E:\\password_test.rar";
        String cmd_prefix = "\"C:\\Program Files\\WinRAR\\rar.exe\" -y x -p";
        
        // 分析入参
        int start = 20110901;
        int end = 20111231;
		if (args.length > 0){
		    path = args[0];
		}
        if (args.length > 2){            
            start = Integer.parseInt(args[1]);
            end = Integer.parseInt(args[2]);
        }
        
        Runtime runtime = Runtime.getRuntime();
        String cmd = null;
        for (int i=start; i < end; i++){
            // command
            cmd = cmd_prefix + i + " " + path;            
            
            // execute command
            Process proc = runtime.exec(cmd);            
            
            // out information (这里inputStream和errorStream 需要同时读，否则会发生死锁的情况)
            new Thread(new OutTask(proc.getInputStream())).start();
            
            // error information
            InputStream is = proc.getErrorStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is, "gbk"));
            String data = null;
            
            boolean finish = true;
            while((data = br.readLine()) != null){
                if (data.contains("errors") || data.contains("failed")){
                    finish = false;
                    break;
                }
            }
            br.close();
            
            if (finish){
                System.out.println("------- password -------");
                System.out.println(i);
                System.out.println("> finished");
                System.exit(0);
            }
            System.out.println(i);
        }
        
        System.out.println("> exit");
    }
}

class OutTask implements Runnable{

    private InputStream is;
    
    public OutTask(InputStream is){
        this.is = is;
    }
    
    @Override
    public void run()
    {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(is, "gbk"));
            while(br.readLine() != null){
                // ..
            }
            br.close();
        } catch(Exception e){
            
        }
        
    }    
}