JSON의 사용(Java Library & Javascript Library)

 1      JSON Library Dependency  설정

다음과 같이 http://search.maven.org/ 리포지터리로 부터 POM을 설정한다.

<!-- JSON Utility -->         <dependency>             <groupId>net.sf.json-lib</groupId>             <artifactId>json-lib</artifactId>             <version>2.4</version>             <classifier>jdk15</classifier>         </dependency>

** classifier를 지정하지 않는경우 missing artifact오류가 나서 다운로드가 받아지지 않아서 추가로 설정 하였다.

 

 

위 그림과 같이 json-lib-2.4-jdk15.jar 파일이 설정되었는지 확인한다.

 

JSON 관련 많은 라이브러리들이 있겠지만http://json-lib.sourceforge.net/의 라이브러리가 일반적으로 많이 사용되어 지는것 같다. 필요한 경우 위 웹싸이트에서 문서를 참고할것.

 

2      Java Object à JSON Object로 전환

package net.sf.code;   import java.util.ArrayList; import java.util.HashMap; import java.util.Map;   import net.sf.json.JSONObject;   public class FileToJson {                   /**                  * @param args                  */                 public static void main(String[] args) {                                 // TODO Auto-generated method stub                                                                                                 Map<String, Object> model = new HashMap<String, Object>();                                                                                                                                ArrayList<Map<String, String>> list = new ArrayList<Map<String,String>>();                                                                                          Map<String, String> node;                                 node = new HashMap<String, String>();                                 node.put("blogurl", "1");                                 node.put("bloguser", "2");                                 node.put("blogpass", "3");                                 node.put("blogid", "4");   list.add(node);                                                      node = null;                                                                                                                 model.put("list", list);                                          JSONObject jsonObject = JSONObject.fromObject(model);                                                        System.out.println(jsonObject);                                        }   }

 

위의 결과는 다음과 같이 JSON형태로 출력이 될것이다.

     {"list":[{"bloguser":"2","blogpass":"3","blogid":"4","blogurl":"1"}]}       

 

 

 

3      JSON Object à Java Object

package net.sf.code;   import java.lang.reflect.InvocationTargetException; import java.util.ArrayList; import java.util.HashMap; import java.util.Map;   import org.apache.commons.beanutils.BeanUtils;   import net.sf.json.JSONObject;   public class FileToJson {                   /**                  * @param args                  * @throws NoSuchMethodException                  * @throws InvocationTargetException                  * @throws IllegalAccessException                  */                 @SuppressWarnings("unchecked")                 public static void main(String[] args) throws IllegalAccessException, InvocationTargetException,                                                                                                NoSuchMethodException {                                 // TODO Auto-generated method stub                                                                                                 String fileContent = "{\"list\":[{\"bloguser\":\"2\",\"blogpass\":\"3\",\"blogid\":\"4\",\"blogurl\":\"1\"}]}";                                                                 Map<String, Object> classMap = new HashMap<String, Object>();                                                                                           JSONObject jsonObject = JSONObject.fromObject(fileContent);                                                //fileContent 에 String 형태의 JSON 을 넣는다                                             Map<String, Object> model = (Map<String, Object>)JSONObject.toBean(jsonObject, java.util.HashMap.class, classMap);                                                                 ArrayList<Object> nodeList = (ArrayList<Object>) model.get("list");                                 for(Object obj: nodeList){                                                                                                 Map<String, String> mp = BeanUtils.describe(obj);                                                                                                 System.out.println( mp.get("bloguser") );                                                 System.out.println( mp.get("blogpass") );                                                 System.out.println( mp.get("blogid") );                                                 System.out.println( mp.get("blogurl") );                                                 System.out.println( "" );                                 }                                                 }   }

 

4      Javascript의 JSON관련 설정 및 예제

http://www.json.org/ 에서 JSON 자바스크립트 라이브러리(json2.js)를 받아 페이지에 설정한다.

 

 

JSON.parse() , toJSONString()

 

var result = "{\"a\":0, \"b\":1000, \"c\":\"abc\"}"; var obj = JSON.parse(result); console.log(obj.a + ", " + obj.b+ ", " + obj.c);    // returns "0, 100, abc" console.log(obj.toJSONString());                         // returns {"a":0,"b":1000,"c":"abc"}

 

 

 

JSON 설정 및 활용.docx