URL中汉字和utf编码转换

java 代码

//转换为%E4%BD%A0形式
public static String toUtf8String(String s) {
          StringBuffer sb = new StringBuffer();
          for (int i = 0; i < s.length(); i++) {
                  char c = s.charAt(i);
                  if (c >= 0 && c <= 255) {
                          sb.append(c);
                  } else {
                          byte[] b;
                          try {
                                  b = String.valueOf(c).getBytes("utf-8");
                          } catch (Exception ex) {
                                  System.out.println(ex);
                                  b = new byte[0];
                          }
                          for (int j = 0; j < b.length; j++) {
                                  int k = b[j];
                                  if (k < 0)
                                          k += 256;
                                  sb.append("%" + Integer.toHexString(k).toUpperCase());
                          }
                  }
          }
          return sb.toString();
  }

//将%E4%BD%A0转换为汉字
      public static String unescape(String s) {
            StringBuffer sbuf = new StringBuffer () ;
            int l  = s.length() ;
            int ch = -1 ;
            int b, sumb = 0;
            for (int i = 0, more = -1 ; i < l ; i++) {
              /* Get next byte b from URL segment s */
              switch (ch = s.charAt(i)) {
                case '%':
                  ch = s.charAt (++i) ;
                  int hb = (Character.isDigit ((char) ch)
                            ? ch - '0'
                            : 10+Character.toLowerCase((char) ch) - 'a') & 0xF ;
                  ch = s.charAt (++i) ;
                  int lb = (Character.isDigit ((char) ch)
                            ? ch - '0'
                            : 10+Character.toLowerCase ((char) ch)-'a') & 0xF ;
                  b = (hb << 4) | lb ;
                  break ;
                case '+':
                  b = ' ' ;
                  break ;
                default:
                  b = ch ;
              }
              /* Decode byte b as UTF-8, sumb collects incomplete chars */
              if ((b & 0xc0) == 0x80) {                        // 10xxxxxx (continuation byte)
                sumb = (sumb << 6) | (b & 0x3f) ;        // Add 6 bits to sumb
                if (--more == 0) sbuf.append((char) sumb) ; // Add char to sbuf
              } else if ((b & 0x80) == 0x00) {                // 0xxxxxxx (yields 7 bits)
                sbuf.append((char) b) ;                        // Store in sbuf
              } else if ((b & 0xe0) == 0xc0) {                // 110xxxxx (yields 5 bits)
                sumb = b & 0x1f;
                more = 1;                                // Expect 1 more byte
              } else if ((b & 0xf0) == 0xe0) {                // 1110xxxx (yields 4 bits)
                sumb = b & 0x0f;
                more = 2;                                // Expect 2 more bytes
              } else if ((b & 0xf8) == 0xf0) {                // 11110xxx (yields 3 bits)
                sumb = b & 0x07;
                more = 3;                                // Expect 3 more bytes
              } else if ((b & 0xfc) == 0xf8) {                // 111110xx (yields 2 bits)
                sumb = b & 0x03;
                more = 4;                                // Expect 4 more bytes
              } else /*if ((b & 0xfe) == 0xfc)*/ {        // 1111110x (yields 1 bit)
                sumb = b & 0x01;
                more = 5;                                // Expect 5 more bytes
              }
              /* We don't test if the UTF-8 encoding is well-formed */
            }
            return sbuf.toString() ;
          }

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• 2007-06-19 14:05
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