//파라미터를 제외한 타겟url
URL url = new URL("타겟url");

HttpURLConnection hConn = (HttpURLConnection)url.openConnection();
hConn.setDoOutput(true);
hConn.setRequestMethod("POST");
PrintWriter pw = null;

//파라미터를 붙인다
pw = new PrintWriter(new OutputStreamWriter(hConn.getOutputStream(), "utf-8"));
pw.print("pageIndex=1");
pw.print("&searchSidoho=");
pw.print("&searchKsangho="+searchcompany);
pw.print("&searchSingoYear=2018");
pw.print("&searchUpjong=27");
pw.print("&searchStrPrice=");
pw.print("&searchEndPrice=");
pw.print("&searchOrder=1");
pw.print("&jsonView=N");

pw.flush();
pw.close();
hConn.connect();

StringBuffer resultb = new StringBuffer();
BufferedReader in = null;

String inputLine;
in = new BufferedReader(new InputStreamReader(hConn.getInputStream(),"utf-8"));
while ((inputLine = in.readLine()) != null) {
resultb.append(inputLine);
resultb.append("\n");
}
in.close();

String result = resultb.toString();