java 中类似js encodeURIComponent 函数的实现

向右看齐 2022-05-13 03:18 296阅读 0赞

# java 中类似js encodeURIComponent 函数的实现  #

import java.io.UnsupportedEncodingException;
    import java.net.URLDecoder;
    import java.net.URLEncoder;
    
    /**
     * Utility class for JavaScript compatible UTF-8 encoding and decoding.
     * 
     * @see http://stackoverflow.com/questions/607176/java-equivalent-to-javascripts-encodeuricomponent-that-produces-identical-output
     * @author John Topley 
     */
    public class EncodingUtil {
      /**
       * Decodes the passed UTF-8 String using an algorithm that's compatible with
       * JavaScript's <code>decodeURIComponent</code> function. Returns
       * <code>null</code> if the String is <code>null</code>.
       *
       * @param s The UTF-8 encoded String to be decoded
       * @return the decoded String
       */
      public static String decodeURIComponent(String s) {
        if (s == null) {
          return null;
        }
    
        String result = null;
    
        try {
          result = URLDecoder.decode(s, "UTF-8");
        }
    
        // This exception should never occur.
        catch (UnsupportedEncodingException e) {
          result = s;  
        }
    
        return result;
      }
    
      /**
       * Encodes the passed String as UTF-8 using an algorithm that's compatible
       * with JavaScript's <code>encodeURIComponent</code> function. Returns
       * <code>null</code> if the String is <code>null</code>.
       * 
       * @param s The String to be encoded
       * @return the encoded String
       */
      public static String encodeURIComponent(String s) {
        String result = null;
    
        try {
          result = URLEncoder.encode(s, "UTF-8")
                             .replaceAll("\\+", "%20")
                             .replaceAll("\\%21", "!")
                             .replaceAll("\\%27", "'")
                             .replaceAll("\\%28", "(")
                             .replaceAll("\\%29", ")")
                             .replaceAll("\\%7E", "~");
        }
    
        // This exception should never occur.
        catch (UnsupportedEncodingException e) {
          result = s;
        }
    
        return result;
      }  
    
      /**
       * Private constructor to prevent this class from being instantiated.
       */
      private EncodingUtil() {
        super();
      }
    }

# #