从某位仁兄那得到，试验一效果不错，解决了我当前遇到的问题。

整理一番，代码如下：

package escape;

//java版本的escape和unescape函数

class EscapeUnescape {

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();

}

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();

}

public static void main(String[] args) {

String tmp = "~!@#$%^&*()_+|\\=-,./?>

System.out.println("testing escape : " + tmp);

tmp = escape(tmp);

System.out.println(tmp);

System.out.println("testing unescape :" + tmp);

System.out.println(unescape(tmp));

}

}

结果如下：testing escape : ~!@#$%^&*()_+|\=-,./?>

%7e%21%40%23%24%25%5e%26%2a%28%29%5f%2b%7c%5c%3d%2d%2c%2e%2f%3f%3e%3c%3b%27%5d%5b%7b%7d%22

testing unescape :%7e%21%40%23%24%25%5e%26%2a%28%29%5f%2b%7c%5c%3d%2d%2c%2e%2f%3f%3e%3c%3b%27%5d%5b%7b%7d%22

~!@#$%^&*()_+|\=-,./?>