dubbo MD5Utils 源码
dubbo MD5Utils 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/utils/MD5Utils.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.dubbo.common.utils;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* MD5 util.
*/
public class MD5Utils {
private static final Logger logger = LoggerFactory.getLogger(MD5Utils.class);
private static final char[] hexDigits = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
private MessageDigest mdInst;
public MD5Utils() {
try {
mdInst = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
logger.error("Failed to obtain md5", e);
}
}
/**
* Calculation md5 value of specify string
* @param input
*/
public String getMd5(String input) {
byte[] md5;
// MessageDigest instance is NOT thread-safe
synchronized (mdInst) {
mdInst.update(input.getBytes(UTF_8));
md5 = mdInst.digest();
}
int j = md5.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md5[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
}
}
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