[Java] 컨트롤러에서 open api 호출하기

CORS 에러를 해결하기 위해 JSP문서에서 open api를 호출하는 대신,

컨트롤러에서 공공기관의 open api를 대신 호출시키고 데이터를 받아오는 방법을 사용했다

 

corsCatch.java

@RequestMapping(value = "/test", method = { RequestMethod.POST },produces = "application/text; charset=utf8")	
public String test1(@RequestParam("url") String preurl) throws IOException {
    String preurl = preurl.replaceAll("&", "&"); //&amp로 넘어온 &를 치환
    String result = null;
    URL url = null;
    HttpURLConnection urlConnection = null;
    InputStream inputStream = null;
    InputStreamReader inputStreamReader = null;
    BufferedReader bufferedReader = null;

    try {
        url = new URL(preurl);
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setConnectTimeout(1000);

          urlConnection.setReadTimeout(2000);


        inputStream = (InputStream) urlConnection.getContent();
        inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
        bufferedReader = new BufferedReader(inputStreamReader);

        StringBuffer buff = new StringBuffer();

        String oneLine = null;
        while ((oneLine = bufferedReader.readLine()) != null) {
            if (oneLine == null || oneLine.length() == 0) {
                continue;
            }

            buff.append(oneLine);
        }

        return buff.toString();

    } catch (NullPointerException e) {
        e.printStackTrace();

    } catch (Exception e) {
        e.printStackTrace();

    } finally {
        try {
            if (bufferedReader != null) {
                bufferedReader.close();
            }
        } catch (NullPointerException e) {
        } catch (Exception e) {
        } finally {
            bufferedReader = null;
        }

        try {
            if (inputStreamReader != null) {
                inputStreamReader.close();
            }
        } catch (NullPointerException e) {
        } catch (Exception e) {
        } finally {
            inputStreamReader = null;
        }

        try {
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (NullPointerException e) {
        } catch (Exception e) {
        } finally {
            inputStream = null;
        }

        try {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
        } catch (NullPointerException e) {
        } catch (Exception e) {
        } finally {
            urlConnection = null;
        }
    }
    return result;
}

urlConnection을 사용해 호출하고 한글이 깨져서 InputStreamReader에 UTF-8을 설정해주었다.

 

 

corsInfo.jsp

var url = ""  //호출할 url

$.ajax({
    url : "test",
    data :{
        url:url
    },
    type :"post",
    dataType : "xml",
    success : function(data) {
        console.log(data);
        var obj = xmlToJson(data);
        console.log(obj);
    },
    error : function(err) {
        alert(err.status);
    }
});

dataType을 xml로 가져와서 Json파일로 변환하였다