package com.wgcloud.util;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
/**
* @version v2.3
* @ClassName:CodeUtil.java
* @author: http://www.wgstart.com
* @date: 2019年11月16日
* @Description: 编码转换
* @Copyright: 2017-2022 wgcloud. All rights reserved.
*/
public class CodeUtil {
/**
* 把SRC编码成uncode
* 方便AJAX传输
*
* @param src
* @return
*/
public static String escape(String src) {
if (src == null) return src;
int i;
char j;
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length() * 6);
for (i = 0; i < src.length(); i++) {
j = src.charAt(i);
if (Character.isDigit(j)
|| Character.isLowerCase(j)
|| Character.isUpperCase(j))
tmp.append(j);
else if (j < 256) {
tmp.append("%");
if (j < 16)
tmp.append("0");
tmp.append(Integer.toString(j, 16));
} else {
tmp.append("%u");
tmp.append(Integer.toString(j, 16));
}
}
return tmp.toString();
}
/**
* 把SRC解出正常编码
*
* @param src
* @return
*/
public static String unescape(String src) {
if (src == null) return src;
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < src.length()) {
pos = src.indexOf("%", lastPos);
if (pos == lastPos) {
if (src.charAt(pos + 1) == 'u') {
ch =
(char) Integer.parseInt(
src.substring(pos + 2, pos + 6),
16);
tmp.append(ch);
lastPos = pos + 6;
} else {
ch =
(char) Integer.parseInt(
src.substring(pos + 1, pos + 3),
16);
tmp.append(ch);
lastPos = pos + 3;
}
} else {
if (pos == -1) {
tmp.append(src.substring(lastPos));
lastPos = src.length();
} else {
tmp.append(src.substring(lastPos, pos));
lastPos = pos;
}
}
}
return tmp.toString();
}
/**
* 前台解码
*
* @param src
* @return
*/
public static String decodeURIComponent(String src) {
if (src == null) return src;
String ret = null;
try {
ret = URLDecoder.decode(src, "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
/**
* 双重编码
*
* @param data
* @return
*/
public static String dbEncode(String data) {
if (data == null) return null;
return CodeUtil.escape(CodeUtil.encodeURIComponent(data));
}
/**
* 双重解码
*
* @param data
* @return
*/
public static String dbDecode(String data) {
if (data == null) return null;
return CodeUtil.decodeURIComponent(CodeUtil.unescape(data));
}
/**
* 前台编码
*
* @param src
* @return
*/
public static String encodeURIComponent(String src) {
if (src == null) return src;
String ret = null;
try {
ret = URLEncoder.encode(src, "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
/**
* HTML转为TEXT
*
* @param str
* @return
*/
public static String toText(String str) {
if (str == null) {
return "";
} else {
str = str.replaceAll("<", "<");
str = str.replaceAll(">", ">");
str = str.replaceAll("'", "''");
str = str.replaceAll(" ", " ");
str = str.replaceAll("\n", "
");
str = str.replaceAll("\"", """);
}
return str;
}
/**
* TEXT转为HTML
*
* @param str
* @return
*/
public static String toHtml(String str) {
if (str == null) {
return "";
} else {
str = str.replaceAll("<", "<");
str = str.replaceAll(">", ">");
str = str.replaceAll("''", "'");
str = str.replaceAll(" ", " ");
str = str.replaceAll("
", "\n");
str = str.replaceAll(""", "\"");
}
return str;
}
private static final char[] hexDigit = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
private static char toHex(int nibble) {
return hexDigit[(nibble & 0xF)];
}
/**
* 将字符串编码成 Unicode 。
*
* @param theString 待转换成Unicode编码的字符串。
* @param escapeSpace 是否忽略空格。
* @return 返回转换后Unicode编码的字符串。
*/
public static String toUnicode(String theString, boolean escapeSpace) {
int len = theString.length();
int bufLen = len * 2;
if (bufLen < 0) {
bufLen = Integer.MAX_VALUE;
}
StringBuffer outBuffer = new StringBuffer(bufLen);
for (int x = 0; x < len; x++) {
char aChar = theString.charAt(x);
// Handle common case first, selecting largest block that
// avoids the specials below
if ((aChar > 61) && (aChar < 127)) {
if (aChar == '\\') {
outBuffer.append('\\');
outBuffer.append('\\');
continue;
}
outBuffer.append(aChar);
continue;
}
switch (aChar) {
case ' ':
if (x == 0 || escapeSpace)
outBuffer.append('\\');
outBuffer.append(' ');
break;
case '\t':
outBuffer.append('\\');
outBuffer.append('t');
break;
case '\n':
outBuffer.append('\\');
outBuffer.append('n');
break;
case '\r':
outBuffer.append('\\');
outBuffer.append('r');
break;
case '\f':
outBuffer.append('\\');
outBuffer.append('f');
break;
case '=': // Fall through
case ':': // Fall through
case '#': // Fall through
case '!':
outBuffer.append('\\');
outBuffer.append(aChar);
break;
default:
if ((aChar < 0x0020) || (aChar > 0x007e)) {
outBuffer.append('\\');
outBuffer.append('u');
outBuffer.append(toHex((aChar >> 12) & 0xF));
outBuffer.append(toHex((aChar >> 8) & 0xF));
outBuffer.append(toHex((aChar >> 4) & 0xF));
outBuffer.append(toHex(aChar & 0xF));
} else {
outBuffer.append(aChar);
}
}
}
return outBuffer.toString();
}
/**
* 从 Unicode 码转换成编码前的特殊字符串。
*
* @param in Unicode编码的字符数组。
* @param off 转换的起始偏移量。
* @param len 转换的字符长度。
* @param convtBuf 转换的缓存字符数组。
* @return 完成转换，返回编码前的特殊字符串。
*/
public String fromUnicode(char[] in, int off, int len, char[] convtBuf) {
if (convtBuf.length < len) {
int newLen = len * 2;
if (newLen < 0) {
newLen = Integer.MAX_VALUE;
}
convtBuf = new char[newLen];
}
char aChar;
char[] out = convtBuf;
int outLen = 0;
int end = off + len;
while (off < end) {
aChar = in[off++];
if (aChar == '\\') {
aChar = in[off++];
if (aChar == 'u') {
// Read the xxxx
int value = 0;
for (int i = 0; i < 4; i++) {
aChar = in[off++];
switch (aChar) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = (value << 4) + aChar - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
value = (value << 4) + 10 + aChar - 'a';
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
value = (value << 4) + 10 + aChar - 'A';
break;
default:
throw new IllegalArgumentException(
"Malformed \\uxxxx encoding.");
}
}
out[outLen++] = (char) value;
} else {
if (aChar == 't') {
aChar = '\t';
} else if (aChar == 'r') {
aChar = '\r';
} else if (aChar == 'n') {
aChar = '\n';
} else if (aChar == 'f') {
aChar = '\f';
}
out[outLen++] = aChar;
}
} else {
out[outLen++] = (char) aChar;
}
}
return new String(out, 0, outLen);
}
}