java.text.ParseException: Failed to parse date ["未知']

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

巴特西

java.text.ParseException: Failed to parse date ["未知']

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