jsp怎么把数据加密

jsp使用MD5对数据进行加密，具体方法如下：

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class MD5Digest{

private MessageDigest __md5 = null;

private StringBuffer __digestBuffer = null;

public MD5Digest()

throws NoSuchAlgorithmException{

__md5 = MessageDigest.getInstance("MD5");

__digestBuffer = new StringBuffer();

}

public String md5crypt(String s){

__digestBuffer.setLength(0);

byte abyte0[] = __md5.digest(s.getBytes());

for(int i = 0; i < abyte0.length; i++)

__digestBuffer.append(toHex(abyte0[i]));

return __digestBuffer.toString();

}

public String toHex(byte one){

String HEX="0123456789ABCDEF";

char[] result=new char[2];

result[0]=HEX.charAt((one & 0xf0) >> 4);

result[1]=HEX.charAt(one & 0x0f);

String mm=new String(result);

return mm;

}

}

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