MediaType.java 文件源码

private String computeToString() {
  StringBuilder builder = new StringBuilder().append(type).append('/').append(subtype);
  if (!parameters.isEmpty()) {
    builder.append("; ");
    Multimap<String, String> quotedParameters =
        Multimaps.transformValues(
            parameters,
            new Function<String, String>() {
              @Override
              public String apply(String value) {
                return TOKEN_MATCHER.matchesAllOf(value) ? value : escapeAndQuote(value);
              }
            });
    PARAMETER_JOINER.appendTo(builder, quotedParameters.entries());
  }
  return builder.toString();
}