packagecom.csdn.shorturl;

publicclassShortUrlGenerator {

/**

*@paramargs

*/

publicstaticvoidmain(String[] args) {

//长连接：http://tech.sina.com.cn/i/2011-03-23/11285321288.shtml

//新浪解析后的短链接为：http://t.cn/h1jGSC

String sLongUrl ="http://tech.sina.com.cn/i/2011-03-23/11285321288.shtml";// 3BD768E58042156E54626860E241E999

String[] aResult =shortUrl(sLongUrl);

//打印出结果

for(inti = 0; i < aResult.length; i++) {

System.out.println("["+ i +"]:::"+ aResult[i]);

}

}

publicstaticString[] shortUrl(String url) {

//可以自定义生成MD5加密字符传前的混合KEY

String key ="wuguowei";

//要使用生成URL的字符

String[] chars =newString[] {"a","b","c","d","e","f","g","h",

"i","j","k","l","m","n","o","p","q","r","s","t",

"u","v","w","x","y","z","0","1","2","3","4","5",

"6","7","8","9","A","B","C","D","E","F","G","H",

"I","J","K","L","M","N","O","P","Q","R","S","T",

"U","V","W","X","Y","Z"

};

//对传入网址进行MD5加密

String sMD5EncryptResult = (newCMyEncrypt()).getMD5OfStr(key + url);

String hex = sMD5EncryptResult;

String[] resUrl =newString[4];

for(inti = 0; i < 4; i++) {

//把加密字符按照8位一组16进制与0x3FFFFFFF进行位与运算

String sTempSubString = hex.substring(i * 8, i * 8 + 8);

//这里需要使用long型来转换，因为Inteper.parseInt()只能处理31位,首位为符号位,如果不用long，则会越界

longlHexLong = 0x3FFFFFFF & Long.parseLong(sTempSubString, 16);

String outChars ="";

for(intj = 0; j < 6; j++) {

//把得到的值与0x0000003D进行位与运算，取得字符数组chars索引

longindex = 0x0000003D & lHexLong;

//把取得的字符相加

outChars += chars[(int) index];

//每次循环按位右移5位

lHexLong = lHexLong >> 5;

}

//把字符串存入对应索引的输出数组

resUrl[i] = outChars;

}

returnresUrl;

}

}

[0]:::7nUFJn

[1]:::f6Zzy2

[2]:::j6jmQb

[3]:::2eAjea