java md5 示例

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

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public class MD5 {

public static String MD5(String inStr) throws NoSuchAlgorithmException {

MessageDigest md5 = null;

md5 = MessageDigest.getInstance("MD5");

byte[] byteArray = inStr.getBytes();

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byte[] md5Bytes = md5.digest(byteArray);

String str=byte2hex(md5Bytes);

return str;

}

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private static String byte2hex(byte[] md5Bytes) {

StringBuffer hexValue = new StringBuffer();

int val=0;

for (int i = 0; i < md5Bytes.length; i++) {

val = ((int) md5Bytes[i]) & 0xff;

if (val < 16)

hexValue.append("0");

hexValue.append(Integer.toHexString(val));

}

return hexValue.toString();

}

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// 测试主函数

public static void main(String args[]) throws NoSuchAlgorithmException {

String s = new String("a");

System.out.println("原始：" + s);

System.out.println("MD5后：" + MD5(s));

}

}