6、MD5加密

第一步：

public static void main(String[] args) throws Exception {

String src = "abc";

byte[] bytes = src.getBytes();

MessageDigest md = MessageDigest.getInstance("MD5");

byte[] targ =md.digest(bytes);

System.out.println(targ.length);

}

第二步：

public static void main(String[] args) throws Exception {

StringBuffer buffer = new StringBuffer();

char[] chars = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

String src = "abc";

byte[] bytes = src.getBytes();

MessageDigest md = MessageDigest.getInstance("MD5");

byte[] targ =md.digest(bytes);

for(byte b: targ){

buffer.append(chars[(b>>4) & 0x0f]);

buffer.append(chars[b & 0x0f]);

}

System.out.println(buffer.toString());

}

第三步：

/**

 * 数据

 */

public class DataUtil {

/**

* 使用md5算法进行加密 

*/

public static String md5(String src){

try {

StringBuffer buffer = new StringBuffer();

char[] chars = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

byte[] bytes = src.getBytes();

MessageDigest md = MessageDigest.getInstance("MD5");

byte[] targ = md.digest(bytes);

for(byte b: targ){

buffer.append(chars[(b >> 4) & 0x0F]);

buffer.append(chars[b & 0x0F]);

}

return buffer.toString();

} catch (Exception e) {

e.printStackTrace();

}

return null ;

}

}