Java中MD5加密算法的实现

package javaTest;

import java.security.MessageDigest;

public class Test {
public static void main(String args[]) {
System.out.println(Md5Result("123456"));
}

public static String Md5Result(String str) {
StringBuffer sb = new StringBuffer();
try {
MessageDigest instance = MessageDigest.getInstance("MD5");
byte[] digest = instance.digest(str.getBytes());// 对字符串加密返回字符串数组
for (byte b : digest) {
int i = b & 0xff;// 获取字节的低八位
String hexString = Integer.toHexString(i);// 转换成16进制
// 一位的话 补0
if (hexString.length() < 2) {
hexString = "0" + hexString;
}
sb.append(hexString);
}
return sb.toString();

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();// 没有此算法的异常
}
return null;
}

}