cn.bestwu.lang.util.EscapeUtil Maven / Gradle / Ivy
package cn.bestwu.lang.util;
/**
* Escape工具
*
* @author Peter Wu
*/
public class EscapeUtil {
/**
* escape
*
* @param src 源
* @return 结果
*/
public static String escape(String src) {
int i;
char j;
StringBuilder tmp = new StringBuilder();
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).toUpperCase());
}
}
return tmp.toString();
}
/**
* unescape
*
* @param src 源
* @return 结果
*/
public static String unescape(String src) {
StringBuilder tmp = new StringBuilder();
tmp.ensureCapacity(src.length());
int lastPos = 0, pos;
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();
}
}