16位大写

//生成MD5

public static String getMD5(String message) {

String md5 = "";

try {

MessageDigest md = MessageDigest.getInstance("MD5"); // 创建一个md5算法对象

byte[] messageByte = message.getBytes("UTF-8");

byte[] md5Byte = md.digest(messageByte); // 获得MD5字节数组,16*8=128位

md5 = bytesToHex(md5Byte); // 转换为16进制字符串

} catch (Exception e) {

e.printStackTrace();

}

return md5;

}

// 二进制转十六进制

public static String bytesToHex(byte[] bytes) {

StringBuffer hexStr = new StringBuffer();

int num;

for (int i = 0; i < bytes.length; i++) {

num = bytes[i];

if(num < 0) {

num += 256;

}

if(num < 16){

hexStr.append("0");

}

hexStr.append(Integer.toHexString(num));

}

return hexStr.toString().toUpperCase();

}

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//32位小写

String sign = encryption(str);

 

public static String encryption(String plain) {

String re_md5 = new String();

MessageDigest md;

try {

md = MessageDigest.getInstance("MD5");

md.update(plain.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));

}

re_md5 = buf.toString();

} catch (NoSuchAlgorithmException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return re_md5;

}