我正在尝试解析在JSON数组中定义的数组列表。但我面临的问题是JSON数组中的数组列表没有任何键。
我在运行代码时遇到此异常： -
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.example.myapp.dto.WayPoints out of START_ARRAY token at [Source:retrofit.ExceptionCatchingTypedInput$ExceptionCatchingInputStream@42d3464; line: 1, column: 6996]
这是我的JSON的样子： -
{"route": {
"waypoints": [
[
35.407744,
139.463554
],
[
35.420147,
139.52120800000003
],
[
35.461081,
139.59132
],
[
35.471748,
139.71372
],
[
35.304347,
139.778226
],
[
35.189787,
139.7631
],
[
35.139229,
139.722619
],
[
35.115603,
139.673938
],
[
28.205743000000002,
131.958977
],
[
21.2065575,
123.78503210000001
],
[
19.7573453,
121.4626719
],
[
19.2394425,
120.6539168
],
[
18.886745,
120.1670009
],
[
18.4292838,
119.87970600000001
],
[
17.8987841,
119.78046750000001
],
[
17.368127,
119.52847100000001
],
[
1.3890885,
104.4579719
],
[
1.3054225,
104.31617560000001
],
[
1.2450838,
104.1318135
],
[
1.182028,
103.7672242
],
[
1.2051203,
103.531714
],
[
1.247416,
103.3209176
],
[
1.4055484,
102.9089111
],
[
2.661926,
101.193657
],
[
6.7192953,
95.6767995
],
[
7.3299653000000005,
94.4741965
],
[
7.977403400000001,
92.167991
],
[
8.030722400000002,
90.7713732
],
[
7.8187621,
88.2752215
],
[
6.3926252,
83.5418168
],
[
5.819811,
82.2456031
],
[
5.660262300000001,
81.0391513
],
[
6.3259034,
75.473531
],
[
9.932762,
62.786145
],
[
12.9051102,
49.5155532
],
[
12.7489972,
46.9425057
],
[
12.190752,
44.273983
],
[
12.230134,
43.934253
],
[
12.479082,
43.423469
],
[
13.148656,
43.19157400000001
],
[
14.19765,
42.513959
],
[
16.3665,
41.253825
],
[
20.357763,
38.033496
],
[
25.091396,
35.574714
],
[
26.6703334,
34.6287713
],
[
27.551982,
34.0345062
],
[
28.181951,
33.42400200000001
],
[
28.960185,
32.904215
],
[
29.594466000000004,
32.607293
],
[
29.868436,
32.541128
],
[
29.922119,
32.554244
],
[
29.927432999999997,
32.557997
],
[
29.946581,
32.579434
],
[
29.958438,
32.584565
],
[
29.970295000000004,
32.586608
],
[
29.985722,
32.58567
],
[
30.001148,
32.582671
],
[
30.037798,
32.575643
],
[
30.078476,
32.570851
],
[
30.121084000000003,
32.570347
],
[
30.201545999999997,
32.56830500000001
],
[
30.235939000000002,
32.542933
],
[
30.256682000000005,
32.515487
],
[
30.283044,
32.44837
],
[
30.305243000000004,
32.412138
],
[
30.40989,
32.358914
],
[
30.443259,
32.352699
],
[
30.466884,
32.34795
],
[
30.509518,
32.338528
],
[
30.525562,
32.329846
],
[
30.546778000000003,
32.310344
],
[
30.559346000000005,
32.305669
],
[
30.570986,
32.303122
],
[
30.594747000000005,
32.312249
],
[
30.615476000000005,
32.322837
],
[
30.637239,
32.328879
],
[
30.673821999999998,
32.337275
],
[
30.695362,
32.342289
],
[
30.706204999999997,
32.344025
],
[
30.716311000000005,
32.3437
],
[
30.785226,
32.324031
],
[
30.814229,
32.318051
],
[
30.855246,
32.316787
],
[
30.92545,
32.314211
],
[
30.995507,
32.312062
],
[
31.064055,
32.30973
],
[
31.124595,
32.30731
],
[
31.221262999999997,
32.304584
],
[
31.24915,
32.306097
],
[
31.263020000000004,
32.317584
],
[
31.272302999999997,
32.325731
],
[
31.276450000000004,
32.316541
],
[
31.670572,
31.837068000000002
],
[
31.767885,
30.811998
],
[
37.9593753,
6.5972614
],
[
37.9452645,
4.9190716
],
[
37.718478,
3.4223181
],
[
36.757234,
-0.5801307
],
[
36.2409795,
-3.4370313
],
[
35.950637,
-5.827275
],
[
36.0965299,
-6.6596297
],
[
36.8398906,
-9.0766174
],
[
37.5455464,
-9.5894154
],
[
38.180763,
-9.668073
],
[
40.9856727,
-9.8365241
],
[
43.3549412,
-9.469394
],
[
44.7745807,
-8.0000582
],
[
47.013348,
-6.433106
],
[
48.3603377,
-5.3426872
],
[
49.4314004,
-3.5484451
],
[
50.591437,
0.996336
],
[
51.343279,
2.373862
],
[
51.379888,
2.760273
],
[
51.365058,
3.188211
],
[
51.349485,
3.20612
],
[
51.33683200000001,
3.209724
],
[
51.2986682,
3.5615743
],
[
51.2444631,
3.9788076
],
[
51.223158,
4.395356
],
[
51.2401821,
5.1084064
],
[
51.18407,
5.820852
],
[
51.292057,
8.095025
],
[
51.973936,
9.904372
],
[
52.189005,
12.016328
],
[
52.435496,
16.800789
],
[
51.991783,
20.511753000000002
]
],
"currentLocation": {
"longitude": 139.463554,
"latitude": 35.407744
}
}
}
以下是我试图解析响应的类。
@JsonProperty("route")
public class Route {
@JsonProperty("currentLocation")
private OrderLocation currentLocation;
@JsonProperty("waypoints")
private List<WayPoints> wayPointsList;
public OrderLocation getCurrentLocation() {
return currentLocation;
}
public void setCurrentLocation(OrderLocation currentLocation) {
this.currentLocation = currentLocation;
}
public List<WayPoints> getWayPointsList() {
return wayPointsList;
}
public void setWayPointsList(List<WayPoints> orderWayPointsList) {
this.wayPointsList = wayPointsList;
}
}
public class WayPoints {
private double lat;
private double lng;
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
public void setLng(double lng) {
this.lng = lng;
}
}
我是杰克逊图书馆的新手，无法弄清楚这一点，我是否需要使用任何密钥来解析航点数据。
答案 0 :(得分：0)
您可以为wayPointsList编写反序列化器：
public class WayPointsDeserializer extends JsonDeserializer<List<WayPoints>> {
@Override
public List<WayPoints> deserialize(JsonParser jsonParser, DeserializationContext ctxt)
throws IOException, JsonProcessingException {
List<WayPoints> wayPoints = new ArrayList<>();
if (jsonParser.getCurrentToken() == JsonToken.START_ARRAY) {
while(jsonParser.nextToken() != JsonToken.END_ARRAY) {
WayPoints wp = new WayPoints();
jsonParser.nextToken();
wp.setLat(jsonParser.getDoubleValue());
jsonParser.nextToken();
wp.setLng(jsonParser.getDoubleValue());
wayPoints.add(wp);
jsonParser.nextToken();
}
return wayPoints;
}
throw ctxt.mappingException("Expect '['");
}
}
并使用：
public class Route {
....
@JsonProperty("waypoints")
@JsonDeserialize(using = WayPointsDeserializer.class)
private List<WayPoints> wayPointsList;
.....
}