[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"