Android开发学习笔记-md5加密算法

十六位的md5加密

private static void Md5(String plainText ) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest(); 

int i; 

StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if(i<0) i+= 256;
if(i<16)
buf.append("0");
buf.append(Integer.toHexString(i));
} 

System.out.println("result: " + buf.toString());//32位的加密 

System.out.println("result: " + buf.toString().substring(8,24));//16位的加密 

} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} 

Md5("12312312312312"); 结果: 
result: ba56bab91016bcb37878e06c16e9e68f