[Java] Serialize & Deserialize (직렬화 & ??? )

///// Java (자바)

///// 환경

Java

Groovy

Gradle

IntelliJ

///// Dependency (디펜덴씨, 의존)

compile 'org.codehaus.groovy:groovy-all:2.3.11'
compile 'org.codehaus.jackson:jackson-core-asl:1.9.13'
compile 'org.codehaus.jackson:jackson-mapper-asl:1.9.13'

///// Example (Serialize & Deserialize)

// Set Map
Map<String, String> obj = new HashMap<String, String>()
obj.hi = 1
obj.Str = 'hihi'
obj.Str1 = ''
obj.Str2 = null
obj[''] = 'ads'

////////// We Need This Object To Use JSON
ObjectMapper mapper = new ObjectMapper()

// Serialize
String json = mapper.writeValueAsString(obj)
println json
// Serialize Remove Null Object
mapper.configure(SerializationConfig.Feature.WRITE_NULL_MAP_VALUES, false);
json = mapper.writeValueAsString(obj)
println json
// Serialize PrettyPrinter
json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj)
println json

// Deserialize
println mapper.readValue(json, Map.class)
// Deserialize
println mapper.readValue(json, new TypeReference<Map>(){})

///// Result (결과)

{"":"ads","Str":"hihi","Str1":"","Str2":null,"hi":1}

{"":"ads","Str":"hihi","Str1":"","hi":1}

{

  "" : "ads",

  "Str" : "hihi",

  "Str1" : "",

  "hi" : 1

}

[:ads, Str:hihi, Str1:, hi:1]

[:ads, Str:hihi, Str1:, hi:1]

///// 참고

How to prevent null values inside a Map and null fields inside a bean from getting serialized through Jackson:

http://stackoverflow.com/questions/11449211/how-to-prevent-null-values-inside-a-map-and-null-fields-inside-a-bean-from-getti

How Do I Write a Jackson JSON Serializer & Deserializer?:

http://wiki.fasterxml.com/JacksonAnnotationSerializeNulls