这个MD5加密采用16个字符加密,比如用0-9,a-f,16个数字加字母进行加密;这个可以根据需要修改。
package com.sm.util;
/* MD5加密类 */
import java.security.MessageDigest;
public class MD5 {
private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
private static String byteArrayToHexString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0) n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static String MD5Encode(String origin) {
String resultString = null;
try {
resultString=new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
resultString=byteArrayToHexString(md.digest(resultString.getBytes()));
}
catch (Exception ex) {
ex.printStackTrace();
}
return resultString;
}
//测试的主方法
public static void main(String[] args) {
String re = MD5Encode("123456");//需要加密的字符串
System.out.println("加密后:"+re);
}
}