else if (obj instanceof char[]) {
            Writer writer = resp.getWriter();
            writer.write((char[]) obj);
            writer.flush();
        }
else if (obj instanceof char[]) {
            Writer writer = resp.getWriter();
            writer.write((char[]) obj);
            writer.flush();
        }
else if ( obj instanceof char [ ] ) { Writer writer = resp . getWriter ( ) ; writer . write ( ( char [ ] ) obj ) ; writer . flush ( ) ; }
字符数组
字符数组