java - How to POST parameters and body in HttpURLConnection -

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how do both @ same time?

the parameters query string parameters. body json. 

 connection.setrequestproperty("content-type", "application/json");  connection.setrequestproperty("accept", "application/json");  connection.setdooutput(true);  connection.getoutputstream().write(parameters);  connection.getoutputstream().write(sqldatabase.tostring().getbytes("utf-8"));

sqldatabase jsonobject, while parameters byte[];

obviously, depends on server interpreting post request. seems me want treat data html form includes file.

such form posts data multipart/form-data body. each parameter, whether query parameter or file data, separate part in multipart body. html 4 spec , rfc 2388 describe in detail.

creating multipart body can done javamail library:

list<bodypart> partlist = new arraylist<>(); parameterlist dispositionparams = new parameterlist();  (string queryparam : parameters.split("&")) {     string[] nameandvalue = queryparam.split("=", 2);     string name = nameandvalue[0];     string value = nameandvalue[1];      name = urldecoder.decode(name, "utf-8");     value = urldecoder.decode(value, "utf-8");      dispositionparams.set("name", name);     contentdisposition disposition =         new contentdisposition("form-data", dispositionparams);      mimebodypart part = new mimebodypart();     part.setdisposition(disposition.tostring());     part.settext(value);     partlist.add(part); }  dispositionparams.set("database", name); contentdisposition disposition =     new contentdisposition("form-data", dispositionparams);  mimebodypart dbpart = new mimebodypart(); dbpart.setdisposition(disposition.tostring()); dbpart.setdatahandler(new datahandler(     new bytearraydatasource(sqldatabase.tostring(), "application/json"))); partlist.add(dbpart);  bodypart[] parts = partlist.toarray(new bodypart[0]);  multipart body = new mimemultipart("form-data", parts);  connection.setrequestproperty("content-type", body.getcontenttype()); connection.setrequestproperty("accept", "application/json"); connection.setdooutput(true); body.writeto(connection.getoutputstream());

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