82 lines
2.6 KiB
Java
82 lines
2.6 KiB
Java
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package cn.keking.utils;
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import java.util.BitSet;
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public class UrlEncoderUtils {
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private static BitSet dontNeedEncoding;
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static {
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dontNeedEncoding = new BitSet(256);
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int i;
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for (i = 'a'; i <= 'z'; i++) {
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dontNeedEncoding.set(i);
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}
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for (i = 'A'; i <= 'Z'; i++) {
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dontNeedEncoding.set(i);
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}
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for (i = '0'; i <= '9'; i++) {
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dontNeedEncoding.set(i);
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}
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dontNeedEncoding.set('+');
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/**
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* 这里会有误差,比如输入一个字符串 123+456,它到底是原文就是123+456还是123 456做了urlEncode后的内容呢？<br>
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* 其实问题是一样的，比如遇到123%2B456,它到底是原文即使如此，还是123+456 urlEncode后的呢？ <br>
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* 在这里，我认为只要符合urlEncode规范的，就当作已经urlEncode过了<br>
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* 毕竟这个方法的初衷就是判断string是否urlEncode过<br>
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*/
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dontNeedEncoding.set('-');
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dontNeedEncoding.set('_');
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dontNeedEncoding.set('.');
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dontNeedEncoding.set('*');
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}
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/**
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* 判断str是否urlEncoder.encode过<br>
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* 经常遇到这样的情况，拿到一个URL,但是搞不清楚到底要不要encode.<Br>
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* 不做encode吧，担心出错，做encode吧，又怕重复了<Br>
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*
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* @param str
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* @return
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*/
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public static boolean hasUrlEncoded(String str) {
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/**
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* 支持JAVA的URLEncoder.encode出来的string做判断。 即: 将' '转成'+' <br>
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* 0-9a-zA-Z保留 <br>
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* '-'，'_'，'.'，'*'保留 <br>
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* 其他字符转成%XX的格式，X是16进制的大写字符，范围是[0-9A-F]
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*/
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boolean needEncode = false;
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for (int i = 0; i < str.length(); i++) {
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char c = str.charAt(i);
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if (dontNeedEncoding.get((int) c)) {
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continue;
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}
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if (c == '%' && (i + 2) < str.length()) {
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// 判断是否符合urlEncode规范
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char c1 = str.charAt(++i);
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char c2 = str.charAt(++i);
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if (isDigit16Char(c1) && isDigit16Char(c2)) {
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continue;
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}
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}
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// 其他字符，肯定需要urlEncode
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needEncode = true;
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break;
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}
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return !needEncode;
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}
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/**
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* 判断c是否是16进制的字符
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*
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* @param c
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* @return
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*/
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private static boolean isDigit16Char(char c) {
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return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F');
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}
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}
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