Gson 日期反序列化失败答案

【问题标题】：Gson date deserialization failingGson 日期反序列化失败
【发布时间】：2017-09-01 16:31:36
【问题描述】：

我在这件事情上已经好几个小时了。

我在一个 android 项目（api ver 21 (android 5.0)）中使用 Gson 2.2.4。

我使用在 nodejs/typescript 中编写的应用程序作为后端，这个后端为 android 客户端序列化 json 数据。

在android客户端我这样做：

Gson gs = new GsonBuilder()
        .setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
        .create();
Type listType = new TypeToken<ArrayList<Recording>>(){}.getType();
final ArrayList<Recording> schedule = gs.fromJson(args[0].toString(), listType);

序列化类：

录音：

package net.misove.mypvrcommon.entities;

/**
 * Created by mhainc on 2/10/2016.
 */
public class Recording {
    public Recording(EPGItem epgItem, String channelName) {
        this.epgItem = epgItem;
        this.channelName = channelName;
    }

    public EPGItem getEpgItem() {
        return epgItem;
    }

    private EPGItem epgItem;

    public String getChannelName() {
        return channelName;
    }

    public void setChannelName(String channelName) {
        this.channelName = channelName;
    }

    private String channelName;
}

EPG 项目：

package net.misove.mypvrcommon.entities;

import net.misove.mypvrcommon.util.Helpers;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

import java.sql.Time;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by mhainc on 2/9/2016.
 */
@Root(name="programme",strict = false)
public class EPGItem {
    @Element(name="id", required = false)
    private Integer id;
    @Element(name="name", required = false)
    private String name;
    @Element(name="premiere", required = false)
    private Integer premiere;
    @Element(name="widescreen", required = false)
    private Integer widescreen;
    @Element(name="stereo", required = false)
    private Integer stereo;
    @Element(name="blackWhite", required = false)
    private Integer blackWhite;
    @Element(name="subtitles", required = false)
    private Integer subtitles;
    @Element(name="hd", required = false)
    private Integer hd;
    @Element(name="shortDescription", required = false)
    private String shortDescription;
    @Element(name="longDescription", required = false)
    private String longDescription;
    @Element(name="series", required = false)
    private Integer series;
    @Element(name="seriesId", required = false)
    private Integer seriesId;
    @Element(name="origin", required = false)
    private String origin;
    //actors
    //directors
    @Element(name="duration", required = false)
    private Integer duration;
    @Element(name="date", required = false)
    private Date date;
    @Element(name="dateTimeInSec", required = false)
    private int dateTimeInSec;
    @Element(name="startDate", required = false)
    private Date startDate;
    @Element(name="startDateTimeInSec", required = false)
    private int startDateTimeInSec;
    @Element(name="startTime", required = false)
    private Time startTime;
    @Element(name="endDate", required = false)
    private Date endDate;
    @Element(name="endDateTimeInSec", required = false)
    private int endDateTimeInSec;
    @Element(name="endTime", required = false)
    private Time endTime;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getPremiere() {
        return premiere;
    }

    public void setPremiere(Integer premiere) {
        this.premiere = premiere;
    }

    public Integer getWidescreen() {
        return widescreen;
    }

    public void setWidescreen(Integer widescreen) {
        this.widescreen = widescreen;
    }

    public Integer getStereo() {
        return stereo;
    }

    public void setStereo(Integer stereo) {
        this.stereo = stereo;
    }

    public Integer getBlackWhite() {
        return blackWhite;
    }

    public void setBlackWhite(Integer blackWhite) {
        this.blackWhite = blackWhite;
    }

    public Integer getSubtitles() {
        return subtitles;
    }

    public void setSubtitles(Integer subtitles) {
        this.subtitles = subtitles;
    }

    public Integer getHd() {
        return hd;
    }

    public void setHd(Integer hd) {
        this.hd = hd;
    }

    public String getShortDescription() {
        return shortDescription;
    }

    public void setShortDescription(String shortDescription) {
        this.shortDescription = shortDescription;
    }

    public String getLongDescription() {
        return longDescription;
    }

    public void setLongDescription(String longDescription) {
        this.longDescription = longDescription;
    }

    public Integer getSeries() {
        return series;
    }

    public void setSeries(Integer series) {
        this.series = series;
    }

    public Integer getSeriesId() {
        return seriesId;
    }

    public void setSeriesId(Integer seriesId) {
        this.seriesId = seriesId;
    }

    public String getOrigin() {
        return origin;
    }

    public void setOrigin(String origin) {
        this.origin = origin;
    }

    public Integer getDuration() {
        return duration;
    }

    public void setDuration(Integer duration) {
        this.duration = duration;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public int getDateTimeInSec() {
        return dateTimeInSec;
    }

    public void setDateTimeInSec(int dateTimeInSec) {
        this.dateTimeInSec = dateTimeInSec;
    }

    public Date getStartDate() {
        return startDate;
    }

    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }

    public int getStartDateTimeInSec() {
        return startDateTimeInSec;
    }

    public void setStartDateTimeInSec(int startDateTimeInSec) {
        this.startDateTimeInSec = startDateTimeInSec;
    }

    public Time getStartTime() {
        return startTime;
    }

    public void setStartTime(Time startTime) {
        this.startTime = startTime;
    }

    public Date getEndDate() {
        return endDate;
    }

    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }

    public int getEndDateTimeInSec() {
        return endDateTimeInSec;
    }

    public void setEndDateTimeInSec(int endDateTimeInSec) {
        this.endDateTimeInSec = endDateTimeInSec;
    }

    public Time getEndTime() {
        return endTime;
    }

    public void setEndTime(Time endTime) {
        this.endTime = endTime;
    }
    //pictures
    //programme-type

    public Date getStartDateTime(Calendar cal)
    {
        cal.setTime(new Date(0));
        cal.add(Calendar.SECOND, getStartDateTimeInSec());
        /*
        Date date = getDate();
        cal.setTime(date);
        cal.add(Calendar.HOUR, startTime.getHours());
        cal.add(Calendar.MINUTE, startTime.getMinutes());
        */
        Date startDate = cal.getTime();
        return startDate;
    }

    public Date getEndDateTime(Calendar cal)
    {
        cal.setTime(new Date(0));
        cal.add(Calendar.SECOND, getEndDateTimeInSec());
        /*
        cal.setTime(date);
        cal.add(Calendar.HOUR, endTime.getHours());
        cal.add(Calendar.MINUTE, endTime.getMinutes());
        */
        Date endDate = cal.getTime();
        return endDate;
    }



    public int getProgress()
    {
        Date nowDt = new Date();
        long now = nowDt.getTime();
        Calendar cal = Helpers.getCalendar();
        long start = getStartDateTime(cal).getTime();
        long end = getEndDateTime(cal).getTime();

        long duration = Math.abs(end - start);
        long played = now - start;

        float onepercent = (float)duration / (float)100;
        float percentplayed =  (float)played / onepercent;
        return Math.round(percentplayed);
    }

}

变量 args[0].toString() JSON 内容为：

[{
    "epgItem": {
        "name": "Jak svet stvoril Ameriku",
        "date": "2017-08-31T22:00:00.000Z",
        "startTime": "2017-09-01T19:00:00.000Z",
        "endTime": "2017-09-01T21:00:00.000Z"
    },
    "channelName": "History HD"
}]

当反序列化程序命中任何日期字段时，我会收到此异常：

com.google.gson.JsonSyntaxException: java.text.ParseException: Unparseable date: "2017-09-01T19:00:00.000Z" (at offset 4)
at com.google.gson.internal.bind.TimeTypeAdapter.read(TimeTypeAdapter.java:59)
at com.google.gson.internal.bind.TimeTypeAdapter.read(TimeTypeAdapter.java:40)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.fromJson(Gson.java:803)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at net.misove.mypvr.ScheduleViewActivity$2.call(ScheduleViewActivity.java:61)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.socketio.client.Socket.onevent(Socket.java:308)
at com.github.nkzawa.socketio.client.Socket.onpacket(Socket.java:272)
at com.github.nkzawa.socketio.client.Socket.access$100(Socket.java:18)
at com.github.nkzawa.socketio.client.Socket$2$2.call(Socket.java:99)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.socketio.client.Manager.ondecoded(Manager.java:347)
at com.github.nkzawa.socketio.client.Manager.access$1300(Manager.java:19)
at com.github.nkzawa.socketio.client.Manager$3.call(Manager.java:321)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.socketio.parser.Parser$Decoder.add(Parser.java:156)
at com.github.nkzawa.socketio.client.Manager.ondata(Manager.java:339)
at com.github.nkzawa.socketio.client.Manager.access$1100(Manager.java:19)
at com.github.nkzawa.socketio.client.Manager$2.call(Manager.java:312)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.engineio.client.Socket.onPacket(Socket.java:482)
at com.github.nkzawa.engineio.client.Socket.access$800(Socket.java:29)
at com.github.nkzawa.engineio.client.Socket$5.call(Socket.java:285)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.engineio.client.Transport.onPacket(Transport.java:121)
at com.github.nkzawa.engineio.client.Transport.onData(Transport.java:113)
at com.github.nkzawa.engineio.client.transports.WebSocket.access$100(WebSocket.java:19)
at com.github.nkzawa.engineio.client.transports.WebSocket$1$3.run(WebSocket.java:74)
at com.github.nkzawa.thread.EventThread$2.run(EventThread.java:75)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.text.ParseException: Unparseable date: "2017-09-01T19:00:00.000Z" (at offset 4)
at java.text.DateFormat.parse(DateFormat.java:579)
at com.google.gson.internal.bind.TimeTypeAdapter.read(TimeTypeAdapter.java:56)
at com.google.gson.internal.bind.TimeTypeAdapter.read(TimeTypeAdapter.java:40) 
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) 
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) 
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) 
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) 
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) 
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) 
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) 
at com.google.gson.Gson.fromJson(Gson.java:803) 
at com.google.gson.Gson.fromJson(Gson.java:768) 
at com.google.gson.Gson.fromJson(Gson.java:717) 
at net.misove.mypvr.ScheduleViewActivity$2.call(ScheduleViewActivity.java:61) 
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117) 
at com.github.nkzawa.socketio.client.Socket.onevent(Socket.java:308) 
at com.github.nkzawa.socketio.client.Socket.onpacket(Socket.java:272) 
at com.github.nkzawa.socketio.client.Socket.access$100(Socket.java:18) 
at com.github.nkzawa.socketio.client.Socket$2$2.call(Socket.java:99) 
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117) 
at com.github.nkzawa.socketio.client.Manager.ondecoded(Manager.java:347) 
at com.github.nkzawa.socketio.client.Manager.access$1300(Manager.java:19) 
at com.github.nkzawa.socketio.client.Manager$3.call(Manager.java:321) 
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117) 
at com.github.nkzawa.socketio.parser.Parser$Decoder.add(Parser.java:156) 
at com.github.nkzawa.socketio.client.Manager.ondata(Manager.java:339) 
at com.github.nkzawa.socketio.client.Manager.access$1100(Manager.java:19) 
at com.github.nkzawa.socketio.client.Manager$2.call(Manager.java:312) 
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117) 
at com.github.nkzawa.engineio.client.Socket.onPacket(Socket.java:482) 
at com.github.nkzawa.engineio.client.Socket.access$800(Socket.java:29) 
at com.github.nkzawa.engineio.client.Socket$5.call(Socket.java:285) 
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117) 
at com.github.nkzawa.engineio.client.Transport.onPacket(Transport.java:121) 
at com.github.nkzawa.engineio.client.Transport.onData(Transport.java:113) 
at com.github.nkzawa.engineio.client.transports.WebSocket.access$100(WebSocket.java:19) 
at com.github.nkzawa.engineio.client.transports.WebSocket$1$3.run(WebSocket.java:74) 
at com.github.nkzawa.thread.EventThread$2.run(EventThread.java:75) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
at java.lang.Thread.run(Thread.java:818)

我特别想知道错误消息中的“（偏移量 4）”是什么......日期格式中的偏移量 4 是“-”，所以它在 JSON 中的日期值中......我'我有点困惑，并希望对此有任何见解。

我想尝试的一件事是为日期编写自己的类型反序列化适配器并将其插入 gson，但这对于简单的日期时间反序列化来说似乎太多了。

更新： “SA”在他的回答中提出的日期使用自己的反序列化适配器的方法也不起作用。抛出同样的异常。

【问题讨论】：

请发帖Recordingclass

标签： android date gson

【解决方案1】：

我想我前段时间遇到过这样的问题。尝试像这样构建您的 gson 实例：

new GsonBuilder()
 .registerTypeAdapter(Date.class, new ISO8601DateAdapter())
 .setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
 .create();

这里有课程：

ISO8601DateAdapter.java

ISO8601DateParser.java

ISO8601TimeAdapter.java

让我知道这是否有效。

【讨论】：

太棒了，很高兴帮助 +1
好的，我添加了课程，+1