密码字典生成java代码

package sgk.norkts.sgk;

import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class PassGenerate {

	public static List<Map<String, String>> lists = new ArrayList<Map<String, String>>();
	public static String[] chars = "0123456789abcdefghijklmnopkrstuvwxyzABCDEFGHIJKLMNOPKRSTUVWXYZ!@#$%^&*()_+-=`~?><,.".split("");
	public static int size = chars.length;

	public static void main(String[] args){
		generatePass(4);
	}

	public static void generatePass(int len){
		Map<String, String> item = new HashMap<String, String>();
		double count = 0;
		for(double index = 0; index < Math.pow(chars.length, len); index++){
			String pass = getNumPass(index);
			//item.put("pass", pass);
			//item.put("md5", md5(pass));
			count++;
			synchronized(lists){
				//lists.add(item);

			}
		}
		System.out.println(count);
	}

	public static String getNumPass(double num){

		int len = 1;
		int pos = 0;
		if(num % size == 0){
			pos = 1;
		}

		while(Math.pow(size, len) < num){
			len += 1;
		}

		len += pos;



		int[] arr = new int[len];

		int count =  len - 1;
		while(num >= size){
			arr[count] = (int) (num % size);
			num = Math.floor(num/size);
			count--;
		}


		arr[count] = (int)num;

		String result = "";
		for(int i = 0; i < len; i++){
			result += chars[arr[i]];
		}

		return result;
	}

	public static String md5(String s){
		char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};       
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }		
	}

	public static class SavePass extends Thread{
		public void run(){
			while(true){

				while(PassGenerate.lists.size() > 0){
					Map<String, String> item = PassGenerate.lists.get(0);
					synchronized(PassGenerate.lists){
						PassGenerate.lists.remove(0);
					}

					System.out.println(item.get("md5") + "=" + item.get("pass"));
				}
			}
		}
	}
}

基本思路，将密码生成转换为n进制数字的循环，通过将n进制各位数的值替换成字符串，即可得到