java解析url参数到hashMap

最新推荐文章于 2022-11-28 10:25:29 发布

原创最新推荐文章于 2022-11-28 10:25:29 发布 · 691 阅读

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tomcat解析url参数的解析方式拿出来做一个备份方便以后使用

  public static void parseParameters(Map map, String data, String encoding)
	    throws UnsupportedEncodingException
	  {
	    if ((data == null) || (data.length() <= 0))
	    {
	      return;
	    }

	    byte[] bytes = null;
	    try {
	      if (encoding == null)
	        bytes = data.getBytes();
	      else
	        bytes = data.getBytes(encoding);
	    }
	    catch (UnsupportedEncodingException uee)
	    {
	    }
	    parseParameters(map, bytes, encoding);
	  }

	public static void parseParameters(Map map, byte[] data, String encoding) throws UnsupportedEncodingException
  {
    if ((data != null) && (data.length > 0)) {
      int ix = 0;
      int ox = 0;
      String key = null;
      String value = null;
      while (ix < data.length) {
        byte c = data[(ix++)];
        switch ((char)c)
        {
        case '&':
          value = new String(data, 0, ox, encoding);
          if (key != null) {
            putMapEntry(map, key, value);
            key = null;
          }
          ox = 0;
          break;
        case '=':
          if (key == null) {
            key = new String(data, 0, ox, encoding);
            ox = 0;
          } else {
            data[(ox++)] = c;
          }
          break;
        case '+':
          data[(ox++)] = 32;
          break;
        case '%':
          data[(ox++)] = (byte)((convertHexDigit(data[(ix++)]) << 4) + convertHexDigit(data[(ix++)]));

          break;
        default:
          data[(ox++)] = c;
        }
      }

      if (key != null) {
        value = new String(data, 0, ox, encoding);
        putMapEntry(map, key, value);
      }
    }
  }
	  private static void putMapEntry(Map map, String name, String value)
	  {
	    String[] newValues = null;
	    String[] oldValues = (String[])(String[])map.get(name);
	    if (oldValues == null) {
	      newValues = new String[1];
	      newValues[0] = value;
	    } else {
	      newValues = new String[oldValues.length + 1];
	      System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);
	      newValues[oldValues.length] = value;
	    }
	    map.put(name, newValues);
	  }
	  private static byte convertHexDigit(byte b)
	  {
	    if ((b >= 48) && (b <= 57)) return (byte)(b - 48);
	    if ((b >= 97) && (b <= 102)) return (byte)(b - 97 + 10);
	    if ((b >= 65) && (b <= 70)) return (byte)(b - 65 + 10);
	    return 0;
	  }