[JAVA] JSONObject - key, value 출력하기

 

// JSON 문자열
String jsonString = "{"
    + "\"name\": \"John Doe\","
    + "\"age\": 30,"
    + "\"address\": \"123 Main Street, Anytown, CA 12345\""
    + "}";

// JSON 문자열을 JSONObject 객체로 변환
JSONObject jsonObject = new JSONObject(jsonString);

//1. get() 메서드로 이름 속성의 값만 가져오기
String name = jsonObject.get("name");
System.out.println("이름: " + name);

//2. keySet() 메서드로 항목 전체 출력
Set<String> keys = jsonObject.keySet();
for (String key : keys) {
    System.out.println(key);
}

//3. entrySet() 메서드로 항목 전체 출력
Set<Map.Entry<String, Object>> entries = jsonObject.entrySet();
for (Map.Entry<String, Object> entry : entries) {
    System.out.println(entry.getKey() + ": " + entry.getValue());
}

//4. JSON 문자열로 변환
String jsonString2 = jsonObject.toString();
System.out.println(jsonString2);

• get() 
• keySet() 
• entrySet() 

//출력결과

이름: John Doe

name: John Doe
age: 30
address: 123 Main Street, Anytown, CA 12345

name: John Doe
age: 30
address: 123 Main Street, Anytown, CA 12345

{"name":"John Doe","age":30,"address":"123 Main Street, Anytown, CA 12345"}​

 

 

 

보면 좋을 다른 포스팅 :

https://rebornbb.tistory.com/entry/JAVA-JSON-to-String-String-to-JSON

[JAVA] JSON to String / String to JSON