src/org/nutz/mvc/upload/util/BufferRing.java
String dumpAsString() throws IOException {
        StringBuilder sb = new StringBuilder();
        OutputStream ops = new StringOutputStream(sb, Encoding.defaultEncoding());
        dump(ops);
        return sb.toString();
    }
String dumpAsString() throws IOException {
        StringBuilder sb = new StringBuilder();
        OutputStream ops = new StringOutputStream(sb, Encoding.defaultEncoding());
        dump(ops);
        return sb.toString();
    }
将标记的内容 Dump 成一个字符串,使用默认字符集

@return 字符串

@throws IOException