java对应javascript的escape,unescape函数

/**

* 加码解码工具

* @author lwm

*

*/

public class Encode {

/*

* 对应javascript的escape()函数, 加码后的串可直接使用javascript的unescape()进行解码

*/

public static String escape(String 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();

}

/*

* 对应javascript的unescape()函数, 可对javascript的escape()进行解码

*/

public static String unescape(String 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();

}

}