[转]使用 google gson 转换Timestamp或Date类型为JSON字符串.

创建类型适配类:

import java.lang.reflect.Type;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;  

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;  

public class TimestampTypeAdapter implements JsonSerializer<Timestamp>, JsonDeserializer<Timestamp>{
    private final DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    public JsonElement serialize(Timestamp src, Type arg1, JsonSerializationContext arg2) {
        String dateFormatAsString = format.format(new Date(src.getTime()));
        return new JsonPrimitive(dateFormatAsString);
    }  

    public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        if (!(json instanceof JsonPrimitive)) {
            throw new JsonParseException("The date should be a string value");
        }  

        try {
            Date date = format.parse(json.getAsString());
            return new Timestamp(date.getTime());
        } catch (ParseException e) {
            throw new JsonParseException(e);
        }
    }  

}

　

类型适配类

  应用类型适配器 写道

Gson gson = new GsonBuilder().registerTypeAdapter(Timestamp.class,new TimestampTypeAdapter()).setDateFormat("yyyy-MM-dd HH:mm:ss").create();
String jsonString = gson.toJson(resourceInfo,ResourceGeoInfo.class);

输出结果

{"positionTime":"2010-01-07 10:57:27"}

Date 类型的时间转换第二种方式;

Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
String jsonString = gson.toJson(new Date(System.currentTimeMillis()),Date.class);
System.out.println(jsonString);

　输出结果:　

"2010-01-07 12:24:34"