Md5加密
MD5加密，java
public class Md5 {
/**
* 十六进制下字符映射的数组
*/
public static final String[] hexString = {"0","1","2","3","4","5","6","7","8","9","a","b",
"c","d","e","f"};
/**
* 把inputString加密
*/
public static String generatePassword(String inputString){
return encodeByMD5(inputString);
}
/**
* 对字符串进行MD5加密
*
* @param password
*/
public static String encodeByMD5(String password){
if(password != null){
try {
// 创建具有指定名称的信息摘要
MessageDigest mes = MessageDigest.getInstance("MD5");
mes.update(password.getBytes("UTF8"));
// 使用指定的字节数组对摘要进行更新并计算
byte[] results = mes.digest();
// 将得到的字节数组变成字符串返回
String resultString = byteArrayToHexString(results);
return resultString.toUpperCase();
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
/**
* 转换字节数组为十六进制字符串
* @param 字节数组
* @return 十六进制字符串
*/
private static String byteArrayToHexString(byte[] b){
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++){
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
/** 将一个字节转化成十六进制形式的字符串 */
private static String byteToHexString(byte b){
int n = b;
if (n < 0)
n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexString[d1] + hexString[d2];
}