package com.jetsum.util;
import java.io.ByteArrayOutputStream;
import java.lang.Character.UnicodeBlock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 该类处理字符串的转码，可以处理字符串到二进制字符、16进制字符、unicode字符、base64字符之间的转换
* @author ShaoJiang
*
*/
public class TranscodeUtil {
/**
* 将字符串转换成unicode码
* @param str 要转码的字符串
* @return 返回转码后的字符串
*/
public static String strToUnicodeStr(String str) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
UnicodeBlock ub = UnicodeBlock.of(ch);
if (ub == UnicodeBlock.BASIC_LATIN) {//英文及数字等
buffer.append(ch);
} else if ((int)ch > 255) {
buffer.append("\\u" + Integer.toHexString((int)ch));
} else {
buffer.append("\\" + Integer.toHexString((int)ch));
}
}
return buffer.toString();
}
/**
* 将unicode码反转成字符串
* @param unicodeStr unicode码
* @return 返回转码后的字符串
*/
public static String unicodeStrToStr(String unicodeStr) {
Pattern pattern = Pattern.compile("(\\\\u(\\p{XDigit}{4}))");
Matcher matcher = pattern.matcher(unicodeStr);
char ch;
while (matcher.find()) {
ch = (char) Integer.parseInt(matcher.group(2), 16);
unicodeStr = unicodeStr.replace(matcher.group(1), ch + "");
}
return unicodeStr;
}
/**
* 将字符串通过base64转码
* @param str 要转码的字符串
* @return 返回转码后的字符串
*/
public static String strToBase64Str(String str) {
return new String(encode(str.getBytes()));
}
/**
* 将base64码反转成字符串
* @param base64Str base64码
* @return 返回转码后的字符串
*/
public static String base64StrToStr(String base64Str) {
char[] dataArr = new char[base64Str.length()];
base64Str.getChars(0, base64Str.length(), dataArr, 0);
return new String(decode(dataArr));
}
/**
* 将字节数组通过base64转码
* @param byteArray 字节数组
* @return 返回转码后的字符串
*/
public static String byteArrayToBase64Str(byte byteArray[]) {
return new String(encode(byteArray));
}
/**
* 将base64码转换成字节数组
* @param base64Str base64码
* @return 返回转换后的字节数组
*/
public static byte[] base64StrToByteArray(String base64Str) {
char[] dataArr = new char[base64Str.length()];
base64Str.getChars(0, base64Str.length(), dataArr, 0);
return decode(dataArr);
}
/**
* 将一个字节数组转换成base64的字符数组
* @param data 字节数组
* @return base64字符数组
*/
private static char[] encode(byte[] data) {
char[] out = new char[((data.length + 2) / 3) * 4];
for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
boolean quad = false;
boolean trip = false;
int val = (0xFF & (int) data[i]);
val <<= 8;
if ((i + 1) < data.length) {
val |= (0xFF & (int) data[i + 1]);
trip = true;
}
val <<= 8;
if ((i + 2) < data.length) {
val |= (0xFF & (int) data[i + 2]);
quad = true;
}
out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
val >>= 6;
out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
val >>= 6;
out[index + 1] = alphabet[val & 0x3F];
val >>= 6;
out[index + 0] = alphabet[val & 0x3F];
}
return out;
}
/**
* 将一个base64字符数组解码成一个字节数组
* @param data base64字符数组
* @return 返回解码以后的字节数组
*/
private static byte[] decode(char[] data) {
int len = ((data.length + 3) / 4) * 3;
if (data.length > 0 && data[data.length - 1] == '=') --len;
if (data.length > 1 && data[data.length - 2] == '=') --len;
byte[] out = new byte[len];
int shift = 0;
int accum = 0;
int index = 0;
for (int ix = 0; ix < data.length; ix++) {
int value = codes[data[ix] & 0xFF];
if (value >= 0) {
accum <<= 6;
shift += 6;
accum |= value;
if (shift >= 8) {
shift -= 8;
out[index++] = (byte) ((accum >> shift) & 0xff);
}
}
}
if (index != out.length)
throw new Error("miscalculated data length!");
return out;
}
/**
* base64字符集 0..63
*/
static private char[] alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
.toCharArray();
/**
* 初始化base64字符集表
*/
static private byte[] codes = new byte[256];
static {
for (int i = 0; i < 256; i++) codes[i] = -1;
for (int i = 'A'; i <= 'Z'; i++) codes[i] = (byte) (i - 'A');
for (int i = 'a'; i <= 'z'; i++) codes[i] = (byte) (26 + i - 'a');
for (int i = '0'; i <= '9'; i++) codes[i] = (byte) (52 + i - '0');
codes['+'] = 62;
codes['/'] = 63;
}
/**
* 16进制数字字符集
*/
private static String hexString = "0123456789ABCDEF";
/**
* 将字符串编码成16进制数字,适用于所有字符（包括中文）
* @param str 字符串
* @return 返回16进制字符串
*/
public static String strToHexStr(String str) {
// 根据默认编码获取字节数组
byte[] bytes = str.getBytes();
StringBuilder sb = new StringBuilder(bytes.length * 2);
// 将字节数组中每个字节拆解成2位16进制整数
for (int i = 0; i < bytes.length; i++) {
sb.append(hexString.charAt((bytes[i] & 0xf0) >> 4));
sb.append(hexString.charAt((bytes[i] & 0x0f) >> 0));
}
return sb.toString();
}
/**
* 将16进制数字解码成字符串,适用于所有字符（包括中文）
* @param hexStr 16进制字符串
* @return 返回字符串
*/
public static String hexStrToStr(String hexStr) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(
hexStr.length() / 2);
// 将每2位16进制整数组装成一个字节
for (int i = 0; i < hexStr.length(); i += 2)
baos.write((hexString.indexOf(hexStr.charAt(i)) << 4 | hexString
.indexOf(hexStr.charAt(i + 1))));
return new String(baos.toByteArray());
}
/**
* 将字节数组转换成16进制字符串
* @param byteArray 要转码的字节数组
* @return 返回转码后的16进制字符串
*/
public static String byteArrayToHexStr(byte byteArray[]) {
StringBuffer buffer = new StringBuffer(byteArray.length * 2);
int i;
for (i = 0; i < byteArray.length; i++) {
if (((int) byteArray[i] & 0xff) < 0x10)//小于十前面补零
buffer.append("0");
buffer.append(Long.toString((int) byteArray[i] & 0xff, 16));
}
return buffer.toString();
}
/**
* 将16进制字符串转换成字节数组
* @param hexStr 要转换的16进制字符串
* @return 返回转码后的字节数组
*/
public static byte[] hexStrToByteArray(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] encrypted = new byte[hexStr.length() / 2];
for (int i = 0; i < hexStr.length() / 2; i++) {
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);//取高位字节
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);//取低位字节
encrypted[i] = (byte) (high * 16 + low);
}
return encrypted;
}
/**
* 将字符串转换成二进制字符串，以空格相隔
* @param str 字符串
* @return 返回二进制字符串
*/
public static String strToBinStr(String str) {
char[] chars=str.toCharArray();
StringBuffer result = new StringBuffer();
for(int i=0; i<chars.length; i++) {
result.append(Integer.toBinaryString(chars[i]));
result.append(" ");
}
return result.toString();
}
/**
* 将二进制字符串转换成Unicode字符串
* @param binStr 二进制字符串
* @return 返回字符串
*/
public static String binStrToStr(String binStr) {
String[] tempStr=strToStrArray(binStr);
char[] tempChar=new char[tempStr.length];
for(int i=0; i<tempStr.length; i++) {
tempChar[i]=binstrToChar(tempStr[i]);
}
return String.valueOf(tempChar);
}
/**
* 将二进制字符串转换为char
* @param binStr 二进制字符串
* @return 返回字符
*/
private static char binstrToChar(String binStr) {
int[] temp=binstrToIntArray(binStr);
int sum=0;
for(int i=0; i<temp.length; i++) {
sum += temp[temp.length-1-i]<<i;
}
return (char)sum;
}
/**
* 将初始二进制字符串转换成字符串数组，以空格相隔
* @param str 二进制字符串
* @return 返回字符串数组
*/
private static String[] strToStrArray(String str) {
return str.split(" ");
}
/**
* 将二进制字符串转换成int数组
* @param binStr 二进制字符串
* @return 返回int数组
*/
private static int[] binstrToIntArray(String binStr) {
char[] temp=binStr.toCharArray();
int[] result=new int[temp.length];
for(int i=0; i<temp.length; i++) {
result[i]=temp[i]-48;
}
return result;
}
}