Spring Boot Deserialization Json, Deserialization JsonString to JsonObject

Spring Boot Deserialization Json, Deserialization JsonString to JsonObject - Json 4편

2018. 11. 12. 14:57

어찌보면 가장 중요한 Deserialization한 JsonString 형태를 파싱하는 방법이다.

Spring Boot에서 Deserialization 파싱을 위해 Jackson과 gson을 사용하면서 동시에 클래스를 생성하여 사용해야한다.

Spring boot Json 1편, 2편, 3편, 마지막

1. 2018/11/06 - [Spring Boot] - Spring Boot Json, JsonObject로 만들기 - JSON 1편

2. 2018/11/07 - [Develop/Spring Boot] - Spring Boot Json, Gson을 이용한 JsonObject to String, String to JsonObject- JSON 2편

3. 2018/11/09 - [Develop/Spring Boot] - Spring Boot Json, Jackson을 이용한 JsonParsing - Json 3편

4. 2018/11/13 - [Develop/Spring Boot] - Spring Boot Json, hashmap to json , JsonObject 만들기- JSON 마지막

번외 Database의 값을 Json으로 select하는 방법.

1. 2018/10/24 - [Spring Boot] - Spring boot jpa map, hashmap, JSON형식

2. 2018/10/28 - [Spring Boot] - Spring boot JPA EntityManager를 이용한 Map형식으로 mapping하기

Spring boot에서 MySQL JSON 타입 SELECT하는 방법

1. 2018/11/30 - [Develop/Spring Boot] - Spring boot MySQL JSON - MySQL JSON DATA TYPE 값 가져오기

1. Class를 생성하여 Gson을 이용한 Deserializaion한 JsonString to Object(JsonObject)

앞의 1편, 2편, 3편에 사용했던 TestDTO를 수정하자.

수정하기 전 먼저 Test_2DTO를 새로 생성한다

<code class="hljs typescript"><span class="hljs-keyword">public <span class="hljs-class"><span class="hljs-keyword">class <span class="hljs-title">TestDTO { <span class="hljs-keyword">private Integer id; <span class="hljs-keyword">private <span class="hljs-built_in">String password; <span class="hljs-keyword">private List details; <span class="hljs-keyword">public <span class="hljs-function"><span class="hljs-title">TestDTO(<span class="hljs-params">) { <span class="hljs-built_in">super(); } <span class="hljs-keyword">public <span class="hljs-function"><span class="hljs-title">TestDTO(<span class="hljs-params">Integer id, <span class="hljs-built_in">String password, List details) { <span class="hljs-built_in">super(); <span class="hljs-built_in">this.id = id; <span class="hljs-built_in">this.password = password; <span class="hljs-built_in">this.details = details; } <span class="hljs-keyword">public Integer <span class="hljs-function"><span class="hljs-title">getId(<span class="hljs-params">) { <span class="hljs-keyword">return id; } <span class="hljs-keyword">public <span class="hljs-built_in">void <span class="hljs-function"><span class="hljs-title">setId(<span class="hljs-params">Integer id) { <span class="hljs-built_in">this.id = id; } <span class="hljs-keyword">public <span class="hljs-built_in">String <span class="hljs-function"><span class="hljs-title">getPassword(<span class="hljs-params">) { <span class="hljs-keyword">return password; } <span class="hljs-keyword">public <span class="hljs-built_in">void <span class="hljs-function"><span class="hljs-title">setPassword(<span class="hljs-params"><span class="hljs-built_in">String password) { <span class="hljs-built_in">this.password = password; } <span class="hljs-keyword">public List <span class="hljs-function"><span class="hljs-title">getDetails(<span class="hljs-params">) { <span class="hljs-keyword">return details; } <span class="hljs-keyword">public <span class="hljs-built_in">void <span class="hljs-function"><span class="hljs-title">setDetails(<span class="hljs-params">List details) { <span class="hljs-built_in">this.details = details; } <span class="hljs-meta">@Override <span class="hljs-keyword">public <span class="hljs-built_in">String <span class="hljs-function"><span class="hljs-title">toString(<span class="hljs-params">) { <span class="hljs-keyword">return <span class="hljs-keyword">new Gson().toJson(<span class="hljs-built_in">this); } } </code>

생성했다면,

<code class="hljs swift"><span class="hljs-keyword">public void test() { <span class="hljs-type">String jsonString <span class="hljs-operator">= <span class="hljs-string">"{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"id\": 1,\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"password\": \"1234\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"details\": [\r\n" <span class="hljs-operator">+ <span class="hljs-string">" {\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 20\r\n" <span class="hljs-operator">+ <span class="hljs-string">" },{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test2\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 21\r\n" <span class="hljs-operator">+ <span class="hljs-string">" }\r\n" <span class="hljs-operator">+ <span class="hljs-string">" ] \r\n" <span class="hljs-operator">+ <span class="hljs-string">"}"; <span class="hljs-type">Gson gson <span class="hljs-operator">= new <span class="hljs-type">Gson(); <span class="hljs-type">TestDTO t <span class="hljs-operator">= gson.fromJson(jsonString, <span class="hljs-type">TestDTO.class); <span class="hljs-type">System.out.println(<span class="hljs-string">"id : " <span class="hljs-operator">+t.getId()); <span class="hljs-type">System.out.println(<span class="hljs-string">"password : "<span class="hljs-operator">+t.getPassword()); <span class="hljs-type">System.out.println(<span class="hljs-string">"name1 : "<span class="hljs-operator">+t.getDetails().get(<span class="hljs-number">0).getName()); <span class="hljs-type">System.out.println(<span class="hljs-string">"age1: "<span class="hljs-operator">+t.getDetails().get(<span class="hljs-number">0).getAge()); <span class="hljs-type">System.out.println(<span class="hljs-string">"name2 : "<span class="hljs-operator">+t.getDetails().get(<span class="hljs-number">1).getName()); <span class="hljs-type">System.out.println(<span class="hljs-string">"age2: "<span class="hljs-operator">+t.getDetails().get(<span class="hljs-number">1).getAge()); } </code>

위에 사용한 Json내용이다.,

<code class="hljs">{ <span class="hljs-attr">"id": <span class="hljs-number">1, <span class="hljs-attr">"password": <span class="hljs-string">"1234", <span class="hljs-attr">"details": [ { <span class="hljs-attr">"name": <span class="hljs-string">"test", <span class="hljs-attr">"age": <span class="hljs-number">20 },{ <span class="hljs-attr">"name": <span class="hljs-string">"test2", <span class="hljs-attr">"age": <span class="hljs-number">21 } ] }</code>

위 test() 메소드를 실행하면 아래와 같이 Deserializaion한 JsonString이 파싱되어 JsonObject에 알맞게 들어간다.

2. Jackson의 ObjectMapper를 이용한 Json String to JsonObject 이다.

Json내용은 위와 동일한 상태에서 진행하였다.

<code class="hljs swift"><span class="hljs-keyword">public void test() { <span class="hljs-type">ObjectMapper objectMapper <span class="hljs-operator">= new <span class="hljs-type">ObjectMapper(); <span class="hljs-type">String jsonString <span class="hljs-operator">= <span class="hljs-string">"{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"id\": 1,\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"password\": \"1234\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"details\": [\r\n" <span class="hljs-operator">+ <span class="hljs-string">" {\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 20\r\n" <span class="hljs-operator">+ <span class="hljs-string">" },{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test2\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 21\r\n" <span class="hljs-operator">+ <span class="hljs-string">" }\r\n" <span class="hljs-operator">+ <span class="hljs-string">" ] \r\n" <span class="hljs-operator">+ <span class="hljs-string">"}"; <span class="hljs-keyword">try { <span class="hljs-type">TestDTO t <span class="hljs-operator">= objectMapper.readValue(jsonString, <span class="hljs-type">TestDTO.class); <span class="hljs-comment">

// String to Object로 변환               System.out.println("ObjectMapper테스트");              System.out.println("id : " +t.getId());                 System.out.println("password : "+t.getPassword());              System.out.println("name1 : "+t.getDetails().get(0).getName());                 System.out.println("age1: "+t.getDetails().get(0).getAge());                System.out.println("name2 : "+t.getDetails().get(1).getName());                 System.out.println("age2: "+t.getDetails().get(1).getAge());                        } catch (IOException e) {               e.printStackTrace();            }        } </span></code>

gson과 마찬가지로 잘 작동된다.

3. Jackson JsonNode 를 이용한 Deserializaion String to JsonObject

어떻게 보면 가장 핵심인 부분일 수도 있다. 클래스 생성없이 할 수 있다는 큰 장점이있다.

Deserializaion Json Data는 위와 동일한 데이터를 사용한다.

<code class="hljs swift"><span class="hljs-keyword">public void test() { <span class="hljs-type">ObjectMapper objectMapper <span class="hljs-operator">= new <span class="hljs-type">ObjectMapper(); <span class="hljs-type">String jsonString <span class="hljs-operator">= <span class="hljs-string">"{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"id\": 1,\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"password\": \"1234\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"details\": [\r\n" <span class="hljs-operator">+ <span class="hljs-string">" {\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 20\r\n" <span class="hljs-operator">+ <span class="hljs-string">" },{\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"name\": \"test2\",\r\n" <span class="hljs-operator">+ <span class="hljs-string">" \"age\": 21\r\n" <span class="hljs-operator">+ <span class="hljs-string">" }\r\n" <span class="hljs-operator">+ <span class="hljs-string">" ] \r\n" <span class="hljs-operator">+ <span class="hljs-string">"}"; <span class="hljs-keyword">try { <span class="hljs-type">System.out.println(<span class="hljs-string">"Jackson JsonNode 테스트"); <span class="hljs-type">JsonNode t <span class="hljs-operator">= objectMapper.readValue(jsonString, <span class="hljs-type">JsonNode.class); <span class="hljs-comment">

// String to Object로 변환                        JsonNode id = t.get("id");          System.out.println("id : " + id.asInt());                       JsonNode password = t.get("password");          System.out.println("password : " + password.asText());                      JsonNode details = t.get("details");            JsonNode details_1 = details.get(0);                    System.out.println("name1 : " + details_1.get("name").asText());            System.out.println("age1: " + details_1.get("age").asInt());                        JsonNode details_2 = details.get(1);                System.out.println("name2 : " + details_2.get("name").asText());            System.out.println("age2: " + details_2.get("name").asText());          } catch (IOException e) {           e.printStackTrace();        } } </span></code>

class 생성없이 파싱이 잘 되었다

이 처럼 웬만한 것들은 class를 생성하여 모든 Deserializaion을 파싱할 수 있으며,

Jackson JsonNode 를 이용하여 처리할 수 있다.

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