Rahul Mittal Rahul Mittal - 5 months ago 33
JSON Question

Jackson date format issue : java bean to JSON string conversion

I am converting a java bean to JSON string using Jackson 2.7.4 version. In doing so, I am facing date format issue. Java 1.7 version is being used.

Bean :

public class BaseBean {

private java.util.Date fromDate;

public Date getFromDate() {
return fromDate;
}

public void setFromDate(Date fromDate) {
this.fromDate = fromDate;
}
}


and I am getting below date format

{"fromDate":1465370289436}


Which is not required by me. then I configured below code

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS , false);
jsonInString = objectMapper.writeValueAsString(objJava);


Then I am getting below date format in JSON :

{"fromDate":"2016-06-08T07:47:06.636+0000"}


Expected date format :

{"fromDate":{"date":8,"day":3,"hours":12,"minutes":48,"month":5,"seconds":9,"time":1465370289436,"timezoneOffset":-330,"year":116}}


Is there any configuration to handle it and get expected date format in JSON string.

Answer

JSON date Serializer :

public class CustomDateSerializer extends JsonSerializer<Date> {

@Override
public void serialize(Date date, JsonGenerator jgen, SerializerProvider provider) throws IOException,
        JsonProcessingException {

    // below methods of Date object is deprecated - consider this as sample example 
    int idate = date.getDate();
    int day = date.getDay();
    int hours = date.getHours();
    int minutes = date.getMinutes();
    int month = date.getMonth();
    int seconds = date.getSeconds();
    long time = date.getTime();
    int timezoneOffset = date.getTimezoneOffset();
    int year = date.getYear();

    jgen.writeStartObject();

    jgen.writeNumberField("date", idate);
    jgen.writeNumberField("day", day);
    jgen.writeNumberField("hours", hours);
    jgen.writeNumberField("minutes", minutes);
    jgen.writeNumberField("month", month);
    jgen.writeNumberField("seconds", seconds);
    jgen.writeNumberField("time", time);
    jgen.writeNumberField("timezoneOffset", timezoneOffset);
    jgen.writeNumberField("year", year);

    jgen.writeEndObject();      
}

@Override
public Class<Date> handledType() {
    return Date.class;
}

}

Setting serializer in SimpleModule :

ObjectMapper objectMapper = new ObjectMapper();
    String jsonInString = "";
    try {
        SimpleModule myModule = new SimpleModule();

        myModule.addSerializer(Date.class, new CustomDateSerializer());
        objectMapper.registerModule(myModule);
        jsonInString = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(objJava);
    } catch (JsonProcessingException e1) {          
        e1.printStackTrace();
    }

Hope this will help !

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