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如题:
代码见附件:没法上传附件,直接给代码:
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import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/*
md5加密算法,有16位、32位加密,分别生成32位、64位密文
*/
public class MD516 {
private static String Md5(String plainText) {
String result = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
// result = buf.toString(); //md5 32bit
// result = buf.toString().substring(8, 24))); //md5 16bit
result = buf.toString().substring(8, 24);
System.out.println("mdt 16bit: " + buf.toString().substring(8, 24));
System.out.println("md5 32bit: " + buf.toString() );
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return result;
}
/* 测试段 { */
public static void main(String args[]) {
String passwd = null;
String loginpasswd = null;
passwd = "123qaz"; //密码明文
loginpasswd = Md5(passwd);
System.out.println("MD5 16Bit : " + loginpasswd);
}
/* 测试段 }*/
}
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