Java中的escape,unescape方法

た入场券 2022-07-12 14:21 357阅读 0赞

类似JavaScript中的escape() 和unescape() 转码方法

package my.tools; public 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(); \} /\*\* \* @disc 对字符串重新编码 \* @param src \* @return \*/ public static String isoToGB(String src) \{ String strRet = null; try \{ strRet = new String(src.getBytes("ISO\_8859\_1"), "GB2312"); \} catch (Exception e) \{ \} return strRet; \} /\*\* \* @disc 对字符串重新编码 \* @param src \* @return \*/ public static String isoToUTF(String src) \{ String strRet = null; try \{ strRet = new String(src.getBytes("ISO\_8859\_1"), "UTF-8"); \} catch (Exception e) \{ \} return strRet; \} public static void main(String\[\] args) \{ String tmp = "中文"; System.out.println("testing escape : " + tmp); tmp = escape(tmp); System.out.println(tmp); System.out.println("testing unescape :" + tmp); System.out.println(unescape("%u6211%u4eec")); System.out.println(isoToUTF(tmp)); \} \}