package com.dianping.cat.report.page;
import java.lang.reflect.Field;
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.FieldNamingStrategy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
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 JsonBuilder {
private FieldNamingStrategy m_fieldNamingStrategy = new FieldNamingStrategy() {
@Override
public String translateName(Field f) {
String name = f.getName();
if (name.startsWith("m_")) {
return name.substring(2);
} else {
return name;
}
}
};
private Gson m_gson = new GsonBuilder().registerTypeAdapter(Timestamp.class, new TimestampTypeAdapter())
.setDateFormat("yyyy-MM-dd HH:mm:ss").setFieldNamingStrategy(m_fieldNamingStrategy).create();
@SuppressWarnings({ "unchecked", "rawtypes" })
public Object parse(String json,Class clz){
return m_gson.fromJson(json, clz);
}
public String toJson(Object o) {
return m_gson.toJson(o);
}
public String toJsonWithEnter(Object o) {
return m_gson.toJson(o) + "\n";
}
public class TimestampTypeAdapter implements JsonSerializer<Timestamp>, JsonDeserializer<Timestamp> {
private final DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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);
}
}
public JsonElement serialize(Timestamp src, Type arg1, JsonSerializationContext arg2) {
String dateFormatAsString = format.format(new Date(src.getTime()));
return new JsonPrimitive(dateFormatAsString);
}
}
}