import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class MD5 { //测试 public static void main(String[] args) { System.out.println("md5:"+md5("admin123")); } /** * 获取特定字符串的MD5码 * eg:md5("YEN") 输出:0d9962cb9239354e6da0ca55ebd0b93c * @param str * @return */ public static String md5(String str){ try { MessageDigest md=MessageDigest.getInstance("MD5"); md.update(str.getBytes()); byte[] b=md.digest(); int temp; StringBuffer sb=new StringBuffer(""); for ( int offset = 0; offset <b.length ; offset++ ) { temp=b[offset]; if(temp<0) temp+=256; if(temp<16) sb.append("0"); sb.append(Integer.toHexString(temp)); } str=sb.toString(); } catch ( NoSuchAlgorithmException e ) { e.printStackTrace(); } return str; } }