java计算文本MD5值学习笔记

java计算文本MD5值,用于加密

import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class GetMd5 { public static void main(String[] args) { String a="123"; System.out.println(getMd5(a)); } /** * 获取文本字段的MD5值 * @param txt * @return */ public static String getMd5(String txt){ String rs = ""; String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8","9", "a", "b", "c", "d", "e", "f" }; try { MessageDigest messageDigest = MessageDigest.getInstance("MD5"); byte[] b = messageDigest.digest(txt.getBytes()); StringBuffer resultSb = new StringBuffer(); for (int i = 0; i < b.length; i++) { int n = b[i]; if (n < 0) n = 256 + n; int d1 = n / 16; int d2 = n % 16; resultSb.append(hexDigits[d1] + hexDigits[d2]); } rs = resultSb.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return rs; } }

输出值:202cb962ac59075b964b07152d234b70
【java计算文本MD5值】