如下所示：

package cn.sunzn.md5; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Str2MD5 { public static void main(String[] args) { MD5("sunzn"); } private static String MD5(String sourceStr) { String result = ""; try { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(sourceStr.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)); } result = buf.toString(); System.out.println("MD5(" + sourceStr + ",32) = " + result); System.out.println("MD5(" + sourceStr + ",16) = " + buf.toString().substring(8, 24)); } catch (NoSuchAlgorithmException e) { System.out.println(e); } return result; } }

MD5(sunzn,32) = 40379db889f9124819228947faaeb1f7 MD5(sunzn,16) = 89f9124819228947

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