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java版本的escape和unescape函数
摘要: 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=" ~!@#$%^&*()_+|\\=-,./?><;'][{}\"";
System.out.println("testing escape : "+tmp);
tmp =escape(tmp);
System.out.println(tmp);
System.out.println("testing unescape :"+tmp);
System.out.println(unescape(tmp));
}
}
</td></tr> </table>
程序运行结果：
C:\java>java EscapeUnescape
testing escape : ~!@#$%^&*()_+|\=-,./?><;'][{}"
%20%7e%21%40%23%24%25%5e&%2a%28%29%5f%2b%7c%5c%3d%2d%2c%2e%2f%3f%3e%3c%3b%27%5
d%5b%7b%7d%22
testing unescape :%20%7e%21%40%23%24%25%5e&%2a%28%29%5f%2b%7c%5c%3d%2d%2c%2e%2
f%3f%3e%3c%3b%27%5d%5b%7b%7d%22
~!@#$%^&*()_+|\=-,./?><;'][{}"
C:\java>
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