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net.hasor.utils.CommonCodeUtils Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or authors.
*
* Licensed 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 net.hasor.utils;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
/**
*
* @version : 2012-6-21
* @author 赵永春 ([email protected] )
*/
public class CommonCodeUtils {
/**
* 简单编码类，该类提供了Base64的编码，该编码器与配套的js编码器可以实现互相编码互相转化功能。
* @version 2009-4-28
* @author 赵永春 ([email protected] )
*/
public static abstract class Base64 {
protected static final String Base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@*-"; // supplement
/***/
// /**返回与Base64对应的JSbase64编码/解码脚本*/
// public static Reader getJSReader() throws UnsupportedEncodingException {
// return new InputStreamReader(Base64.class.getResourceAsStream("/META-INF/resource/util/base64.js"), "utf-8");
// };
/**
* 使用UTF-8编码进行Base64编码
* @param s 要编码的原始数据
* @return 返回编码之后的字符串。
*/
public static String base64Encode(final String s) {
if (s == null || s.length() == 0) {
return s;
}
byte[] b = null;
b = s.getBytes(StandardCharsets.UTF_8);
return Base64.base64EncodeFoArray(b);
}
/** Encoding a byte array to a string follow the Base64 regular. */
public static String base64EncodeFoArray(final byte[] s) {
if (s == null) {
return null;
}
if (s.length == 0) {
return "";
}
StringBuffer buf = new StringBuffer();
int b0, b1, b2, b3;
int len = s.length;
int i = 0;
while (i < len) {
byte tmp = s[i++];
b0 = (tmp & 0xfc) >> 2;
b1 = (tmp & 0x03) << 4;
if (i < len) {
tmp = s[i++];
b1 |= (tmp & 0xf0) >> 4;
b2 = (tmp & 0x0f) << 2;
if (i < len) {
tmp = s[i++];
b2 |= (tmp & 0xc0) >> 6;
b3 = tmp & 0x3f;
} else {
b3 = 64; // 1 byte "-" is supplement
}
} else {
b2 = b3 = 64;// 2 bytes "-" are supplement
}
buf.append(Base64.Base64Chars.charAt(b0));
buf.append(Base64.Base64Chars.charAt(b1));
buf.append(Base64.Base64Chars.charAt(b2));
buf.append(Base64.Base64Chars.charAt(b3));
}
return buf.toString();
}
/** Decoding a string to a string follow the Base64 regular. */
public static String base64Decode(final String s) {
byte[] b = Base64.base64DecodeToArray(s);
if (b == null) {
return null;
}
if (b.length == 0) {
return "";
}
return new String(b, StandardCharsets.UTF_8);
}
/** Decoding a string to a byte array follow the Base64 regular */
public static byte[] base64DecodeToArray(final String s) {
if (s == null) {
return null;
}
int len = s.length();
if (len == 0) {
return new byte[0];
}
if (len % 4 != 0) {
throw new IllegalArgumentException(s);
}
byte[] b = new byte[len / 4 * 3];
int i = 0, j = 0, e = 0, c, tmp;
while (i < len) {
c = Base64.Base64Chars.indexOf(s.charAt(i++));
tmp = c << 18;
c = Base64.Base64Chars.indexOf(s.charAt(i++));
tmp |= c << 12;
c = Base64.Base64Chars.indexOf(s.charAt(i++));
if (c < 64) {
tmp |= c << 6;
c = Base64.Base64Chars.indexOf(s.charAt(i++));
if (c < 64) {
tmp |= c;
} else {
e = 1;
}
} else {
e = 2;
i++;
}
b[j + 2] = (byte) (tmp & 0xff);
tmp >>= 8;
b[j + 1] = (byte) (tmp & 0xff);
tmp >>= 8;
b[j + 0] = (byte) (tmp & 0xff);
j += 3;
}
if (e != 0) {
len = b.length - e;
byte[] copy = new byte[len];
System.arraycopy(b, 0, copy, 0, len);
return copy;
}
return b;
}
}
/**
* MD5算法提供
* @version : 2011-11-7
* @author 赵永春 ([email protected] )
*/
public static abstract class MD5 {
public static String encodeMD5(final byte[] source) throws NoSuchAlgorithmException {
String s = null;
// 用来将字节转换成 16 进制表示的字符
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数，用字节表示就是 16 个字节
char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话，使用两个字符，所以表示成 16 进制需要 32 个字符
int k = 0; // 表示转换结果中对应的字符位置
for (int i = 0; i < 16; i++) { // 从第一个字节开始，对 MD5 的每一个字节转换成 16 进制字符的转换
byte byte0 = tmp[i]; // 取第 i 个字节
str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换, >>> 为逻辑右移，将符号位一起右移
str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
}
s = new String(str); // 换后的结果转换为字符串
return s;
}
public static String getMD5(final String source) throws NoSuchAlgorithmException {
return MD5.getMD5(source.getBytes());
}
public static String getMD5(final byte[] source) throws NoSuchAlgorithmException {
String s = null;
// 用来将字节转换成 16 进制表示的字符
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数，用字节表示就是 16 个字节
char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话，使用两个字符，所以表示成 16 进制需要 32 个字符
int k = 0; // 表示转换结果中对应的字符位置
for (int i = 0; i < 16; i++) { // 从第一个字节开始，对 MD5 的每一个字节转换成 16 进制字符的转换
byte byte0 = tmp[i]; // 取第 i 个字节
str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换, >>> 为逻辑右移，将符号位一起右移
str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
}
s = new String(str); // 换后的结果转换为字符串
return s;
}
}
/**
* 基于十六进制的字符转换
* @version : 2013-8-13
* @author 赵永春 ([email protected] )
*/
public static abstract class HexConversion {
/** 字符串转换成十六进制字符串 */
public static String str2HexStr(final String str) {
char[] chars = "0123456789ABCDEF".toCharArray();
StringBuilder sb = new StringBuilder("");
byte[] bs = str.getBytes();
int bit;
for (byte element : bs) {
bit = (element & 0x0f0) >> 4;
sb.append(chars[bit]);
bit = element & 0x0f;
sb.append(chars[bit]);
}
return sb.toString();
}
/** 十六进制转换字符串 */
public static String hexStr2Str(final String hexStr) {
String str = "0123456789ABCDEF";
char[] hexs = hexStr.toCharArray();
byte[] bytes = new byte[hexStr.length() / 2];
int n;
for (int i = 0; i < bytes.length; i++) {
n = str.indexOf(hexs[2 * i]) * 16;
n += str.indexOf(hexs[2 * i + 1]);
bytes[i] = (byte) (n & 0xff);
}
return new String(bytes);
}
/** bytes转换成十六进制字符串 */
public static String byte2HexStr(final byte[] b) {
String hs = "";
String stmp = "";
for (byte element : b) {
stmp = Integer.toHexString(element & 0XFF);
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
//if (n 128) {
strRet += "\\u" + strHex;
} else {
// 低位在前面补00
strRet += "\\u00" + strHex;
}
}
return strRet;
}
/** unicode的String转换成String的字符串 */
public static String unicodeToString(final String hex) {
int t = hex.length() / 6;
StringBuilder str = new StringBuilder();
for (int i = 0; i < t; i++) {
String s = hex.substring(i * 6, (i + 1) * 6);
// 高位需要补上00再转
String s1 = s.substring(2, 4) + "00";
// 低位直接转
String s2 = s.substring(4);
// 将16进制的string转为int
int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16);
// 将int转换为字符
char[] chars = Character.toChars(n);
str.append(new String(chars));
}
return str.toString();
}
private static byte uniteBytes(final String src0, final String src1) {
byte b0 = Byte.decode("0x" + src0).byteValue();
b0 = (byte) (b0 << 4);
byte b1 = Byte.decode("0x" + src1).byteValue();
byte ret = (byte) (b0 | b1);
return ret;
}
}
}
