Poco：http中传输json对象

来源：互联网发布：怎样评价井柏然知乎编辑：程序博客网时间：2024/05/10 20:21

Poco中封装了表单提交的功能，提交表单是非常简单的。

Net::HTMLForm form;form.add("name", "jack");URI url("http://httpbin.org/post");Net::HTTPClientSession session(url.getHost(), url.getPort());Net::HTTPRequest req(Net::HTTPRequest::HTTP_POST, url.getPathAndQuery());form.prepareSubmit(req);auto& ostr = session.sendRequest(req);form.write(ostr);Net::HTTPResponse resp;session.receiveResponse(resp);

如今在http中传输json也是比较常见的，但是Poco并没有封装相关接口。

先看看HTMLForm内部做了些什么

void HTMLForm::prepareSubmit(HTTPRequest& request){if (request.getMethod() == HTTPRequest::HTTP_POST || request.getMethod() == HTTPRequest::HTTP_PUT){if (_encoding == ENCODING_URL){request.setContentType(_encoding);request.setChunkedTransferEncoding(false);Poco::CountingOutputStream ostr;writeUrl(ostr);request.setContentLength(ostr.chars());}else{_boundary = MultipartWriter::createBoundary();std::string ct(_encoding);ct.append("; boundary=\"");ct.append(_boundary);ct.append("\"");request.setContentType(ct);}if (request.getVersion() == HTTPMessage::HTTP_1_0){request.setKeepAlive(false);request.setChunkedTransferEncoding(false);}else if (_encoding != ENCODING_URL){request.setChunkedTransferEncoding(true);}}else{std::string uri = request.getURI();std::ostringstream ostr;writeUrl(ostr);uri.append("?");uri.append(ostr.str());request.setURI(uri);}}

很简单，只有在使用了post并且content-type为"application/x-www-form-urlencoded"时才会写入表单，所以我们可以直接操作Request。

JSON::Object jo;jo.set("name", "jack");std::ostringstream ss;jo.stringify(ss);std::string s;s = ss.str();URI url("http://httpbin.org/post");Net::HTTPClientSession session(url.getHost(), url.getPort());Net::HTTPRequest req(Net::HTTPRequest::HTTP_POST, url.getPathAndQuery());//form.prepareSubmit(req);req.setChunkedTransferEncoding(false);req.setContentType("application/json");req.setContentLength(s.length());session.sendRequest(req) << s;Net::HTTPResponse resp;session.receiveResponse(resp);

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