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859天前/** |
* java实现javascript中的escape和unescape函数 |
* 多用于URL编码与解码 |
*/ |
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(); |
} |
public static void main(String[] args) { |
String tmp = "钓鱼岛是中国的！"; |
System.out.println("编码： " + escape(tmp)); |
System.out.println("解码： " + unescape(tmp)); |
} |
} |
