MD5加密

<pre name="code" class="java">import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {

public static void main(String[] args) {
String password = "123456";

try {
MessageDigest instance = MessageDigest.getInstance("MD5");// 获取MD5算法对象
byte[] digest = instance.digest(password.getBytes());// 对字符串加密,返回字节数组

StringBuffer sb = new StringBuffer();
for (byte b : digest) {
int i = b & 0xff;// 获取字节的低八位有效值
String hexString = Integer.toHexString(i);// 将整数转为16进制
// System.out.println(hexString);

if (hexString.length() < 2) {
hexString = "0" + hexString;// 如果是1位的话,补0
}

sb.append(hexString);
}

System.out.println("md5:" + sb.toString());
System.out.println("md5 length:" + sb.toString().length());//Md5都是32位

} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
// 没有该算法时,抛出异常, 不会走到这里
}
}
}