OPNE DATA PORTAL

var data = {
     serviceKey: 'UTF-8로 인코딩된 인증키',
     s_page: 0,
     s_list: 1,
     type: 'json'
     instt_nm: 'UTF-8로 인코딩된 value'
};

$.ajax({
     post: 'get',
     url: 'http://api.data.go.kr/openapi/tn_pubr_public_schul_atndskl_zn_drw_lnkinfo_api',
     data: data,
     dataType: 'jsonp',
     success: function(data){
          console.log(data);
     }
});

String strUrl = "http://api.data.go.kr/openapi/tn_pubr_public_schul_atndskl_zn_drw_lnkinfo_api";
strUrl += "?serviceKey=UTF-8로 인코딩된 인증키";
strUrl += "&type=xml";
strUrl += "&s_page=0";
strUrl += "&s_list=1";
strUrl += "&instt_nm=UTF-8로 인코딩된 value";
URL url = new URL(strUrl);
URLConnection urlConnection = url.openConnection();
HttpURLConnection connection = null;
if(urlConnection instanceof HttpURLConnection)
{
    connection = (HttpURLConnection) urlConnection;
}
else
{
    System.out.println("error");
    return;
}
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String urlString = "";
String current;
while((current = in.readLine()) != null)
{
    urlString += current+"\n";
}
System.out.println(urlString);