메이븐 사용 시,
메이븐 레포지토리에서 json(id - org.json / version - 20200518)을 가져옵니다.
예시) JSON 파일에서 키 및 값 출력
String content;
try {
content = new String(Files.readAllBytes(Paths.get("파일 경로")));
JSONObject o1 = new JSONObject(content);
//System.out.println(content); //json 파일 내용
Iterator<String> iiter = o1.keys();
String key = "";
while (iiter.hasNext()) {
key= iiter.next();
System.out.println("1st key : " + key);
//System.out.println(o1.get(key));
//System.out.println(o1.get(key).getClass().getName()); // 자료형, 클래스 확인
if(o1.get(key).getClass().getName().equals("org.json.JSONObject")) {
//System.out.println(o1.getJSONObject(key));
//System.out.println(o1.getJSONObject(key).length()); // 2: maths, sport
JSONObject o2 = o1.getJSONObject(key);
Iterator<String> iiter2 = o2.keys();
String key2 = "";
while (iiter2.hasNext()) {
key2 = iiter2.next();
System.out.println("2nd key : "+key2);
//System.out.println(o2.getJSONObject(key2));
//System.out.println(o2.getJSONObject(key2).length());
//System.out.println(o2.get(key2).getClass().getName());
if(o2.get(key2).getClass().getName().equals("org.json.JSONObject")) {
JSONObject o3 = o2.getJSONObject(key2);
Iterator<String> iiter3 = o3.keys();
String key3 = "";
while (iiter3.hasNext()) {
key3 = iiter3.next();
System.out.println("3rd key : " + key3);
//System.out.println(o3.getJSONObject(key3));
//System.out.println(o3.getJSONObject(key3).length());
//System.out.println(o3.get(key3).getClass().getName());
if(o3.get(key3).getClass().getName().equals("org.json.JSONObject")) {
//System.out.println("4th JSONObject");
JSONObject o4 = o3.getJSONObject(key3);
Iterator<String> iiter4 = o4.keys();
String key4 ="";
while (iiter4.hasNext()) {
key4 = iiter4.next();
System.out.println("4th key : " + key4);
//System.out.println(o4.get(key4).getClass().getName());
if(o4.get(key4).getClass().getName().equals("org.json.JSONObject")) {
/*최종 저장 : 더 이상 jsonobject 유형이 나오지 않는 시점*/
System.out.println("5th jsonobject");
}else if(o4.get(key4).getClass().getName().equals("org.json.JSONArray")) {
//Array
JSONArray Jarray = o4.getJSONArray(key4);
//System.out.println(Jarray.length()); //3
for (int i = 0; i < Jarray.length(); i++) {
System.out.println("4th array value"+i+" : " + Jarray.get(i));
}
}else {
System.out.println("4th value : " + o4.get(key4));
}
}
}else if(o3.get(key3).getClass().getName().equals("org.json.JSONArray")) {
//Array
JSONArray Jarray = o3.getJSONArray(key3);
//System.out.println(Jarray.length()); //3
for (int i = 0; i < Jarray.length(); i++) {
System.out.println("3rd array value"+i+" : " + Jarray.get(i));
}
}else {
System.out.println("3rd value : " + o3.get(key3));
}
}
}else if(o2.get(key2).getClass().getName().equals("org.json.JSONArray")) {
//Array
JSONArray Jarray = o2.getJSONArray(key2);
//System.out.println(Jarray.length()); //3
for (int i = 0; i < Jarray.length(); i++) {
System.out.println("2nd array value"+i+" : " + Jarray.get(i));
}
}else {
System.out.println("2nd value : " + o2.get(key2));
}
}
}else if(o1.get(key).getClass().getName().equals("org.json.JSONArray")){
//Array
JSONArray Jarray = o1.getJSONArray(key);
//System.out.println(Jarray.length()); //3
for (int i = 0; i < Jarray.length(); i++) {
System.out.println("1st array value"+i+" : " + Jarray.get(i));
}
}else {
//String ETC
System.out.println("1st value :" + o1.get(key));
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
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