先把"未知"替换为""
直接new 出来的Gson 对象是无法解析为""的Date属性的,需要通过GsonBuilder来进行创建
Gson ignoreDateGson=new GsonBuilder().registerTypeAdapterFactory(new DateNullAdapterFactory<>()).create();
这个registerTypeAdapterFactory()方法就是添加自己的适配器,来对某些特定的类型进行处理.new 出来的这个DateNullAdapterFactory.class 需要自己写.
import java.util.Date; import com.google.gson.Gson; import com.google.gson.TypeAdapter; import com.google.gson.TypeAdapterFactory; import com.google.gson.reflect.TypeToken; public class DateNullAdapterFactory<T> implements TypeAdapterFactory { @SuppressWarnings("unchecked") public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) { Class<T> rawType = (Class<T>) type.getRawType(); if (rawType != Date.class) { return null; } return (TypeAdapter<T>) new DateNullAdapter(); } }
import java.io.IOException; import java.text.DateFormat; import java.text.ParseException; import java.text.ParsePosition; import java.util.Date; import java.util.Locale; import com.google.gson.Gson; import com.google.gson.JsonSyntaxException; import com.google.gson.TypeAdapter; import com.google.gson.TypeAdapterFactory; import com.google.gson.internal.bind.DateTypeAdapter; import com.google.gson.internal.bind.util.ISO8601Utils; import com.google.gson.reflect.TypeToken; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonToken; import com.google.gson.stream.JsonWriter; import com.zxtc.common.utils.StringUtils; public class DateNullAdapter extends TypeAdapter<Date>{ public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() { @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { return typeToken.getRawType() == Date.class ? (TypeAdapter<T>) new DateTypeAdapter() : null; } }; private final DateFormat enUsFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US); private final DateFormat localFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT); @Override public Date read(JsonReader in) throws IOException { if (in.peek() == JsonToken.NULL) { in.nextNull(); return null; } String jsonStr = in.nextString(); if(StringUtils.isBlank(jsonStr)) { return null; }else { return deserializeToDate(jsonStr); } } private synchronized Date deserializeToDate(String json) { try { return localFormat.parse(json); } catch (ParseException ignored) { } try { return enUsFormat.parse(json); } catch (ParseException ignored) { } try { return ISO8601Utils.parse(json, new ParsePosition(0)); } catch (ParseException e) { throw new JsonSyntaxException(json, e); } } @Override public synchronized void write(JsonWriter out, Date value) throws IOException { if (value == null) { out.nullValue(); return; } String dateFormatAsString = enUsFormat.format(value); out.value(dateFormatAsString); } }
可能还会出现报错:Invalid time zone indicator
两种结合:把date改string