import java.security.MessageDigest;import java.security.NoSuchAlgorithmException; public class Test { public static void main(String[] args) { Test test = new Test(); System.out.println(test.encryption("12345678")); } /** * * @param plainText * 明文 * @return 32位密文 */ public String encryption(String plainText) { String re_md5 = new String(); 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)); } re_md5 = buf.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return re_md5; }}