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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=" ~!@#$%^&*()_+|\\=-,./?><;'][{}\""; System.out.println("testing escape : "+tmp); tmp =escape(tmp); System.out.println(tmp); System.out.println("testing unescape :"+tmp); System.out.println(unescape(tmp)); } }
程序运行结果:
C:\java>java EscapeUnescape
testing escape : ~!@#$%^&*()_+|\=-,./?><;'][{}"
%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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