Android Jackson 2反序列化

我在使用谷歌地理编码api时遇到问题。例如，通过这个url，我想用jackson 2解析json以创建POJO

所以我的班级是

public class GeocoderResult {

@JsonProperty("results") private List<GeocoderGoog> geocoder;
@JsonProperty("status") private String status;

public List<GeocoderGoog> getGeocoder() {
    return geocoder;
}
public String getStatus() {
    return status;
}

}

我有以下错误：

09:38:42.737 Thread-24889 An exception occurred during request network execution :Unexpected close marker '}': expected ']' (for ROOT starting at [Source: java.io.BufferedInputStream@428a1840; line: 1, column: 0])                                       
 at [Source: java.io.BufferedInputStream@428a1840; line: 2, column: 14]
 com.fasterxml.jackson.core.JsonParseException: Unexpected close marker '}': expected ']' (for ROOT starting at [Source: java.io.BufferedInputStream@428a1840; line: 1, column: 0])

我不明白问题出在哪里

---

ps：我使用jackson core、jackson databind和jackson annotations 2.1.4

我是jackson的粉丝，我可以说你让我好奇。我使用了您公开的URL，并使其工作如下使用当前API版本：2.2.3

模型类：

GeocoderResult

public class GeocoderResult {

    @JsonProperty("results")
    private ArrayList<GeocoderGoog> geocoder;

    @JsonProperty("status")
    private String status;

    public ArrayList<GeocoderGoog> getGeocoder() {
        return geocoder;
    }

    public String getStatus() {
        return status;
    }
}

public class AddressComponent {
    @JsonProperty("long_name")
    private String longName;

    @JsonProperty("short_name")
    private String shortName;

    private ArrayList<String> types;

    public String getLongName() {
        return longName;
    }

    public String getShortName() {
        return shortName;
    }

    public ArrayList<String> getTypes() {
        return types;
    }

}

以及带有视口的几何体：

public class Geometry {
    private Coordinates location;

    @JsonProperty("location_type")
    private String locationType;

    private ViewPort viewport;

    public Coordinates getLocation() {
        return location;
    }

    public String getLocationType() {
        return locationType;
    }

    public ViewPort getViewport() {
        return viewport;
    }

    public static class ViewPort {
        private Coordinates northeast;
        private Coordinates southwest;

        public Coordinates getNortheast() {
            return northeast;
        }

        public Coordinates getSouthwest() {
            return southwest;
        }

    }
}

总而言之，对我来说，第一次尝试就成功了：

protected void performJackson() {
    new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... params) {
            try {
                String baseUrl = "http://maps.google.com/maps/api/geocode/json?latlng=47.3195254,5.0430687&sensor=true";
                HttpURLConnection connection = (HttpURLConnection) new URL(baseUrl).openConnection();
                ObjectMapper mapper = new ObjectMapper();
                // disable exceptions when there is unknown properties
                mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
                int statusCode = connection.getResponseCode();
                Log.d("SJackson", "Status : " + statusCode);
                if (statusCode == HttpURLConnection.HTTP_OK) { // 200
                    InputStream is = new BufferedInputStream(connection.getInputStream());
                    GeocoderResult result = mapper.readValue(is, GeocoderResult.class);
                    Log.d("SJackson", "Done: " + (result != null));
                }
            } catch (Exception ex) {
                Log.e("SJackson", null, ex);
            }

            return null;
        }
    }.execute();
}

protectedvoid performJackson（）{
新建异步任务（）{
@凌驾
受保护的Void doInBackground（Void…参数）{
试一试{
字符串baseUrl=”http://maps.google.com/maps/api/geocode/json?latlng=47.3195254，5.0430687&传感器=真”；
HttpURLConnection connection=（HttpURLConnection）新URL（baseUrl）.openConnection（）；
ObjectMapper mapper=新的ObjectMapper（）；
//存在未知属性时禁用异常
禁用（反序列化功能。在未知属性上失败）；
int statusCode=connection.getResponseCode（）；
Log.d（“SJackson”，“状态：+statusCode”）；
如果（statusCode==HttpURLConnection.HTTP_OK）{//200
InputStream is=new BufferedInputStream（connection.getInputStream（））；
GeocoderResult结果=mapper.readValue（即GeocoderResult.class）；
d（“SJackson”，“Done:”+（result！=null））；
}
}捕获（例外情况除外）{
Log.e（“SJackson”，null，ex）；
}
返回null；
}
}.execute（）；
}

为什么

坐标
类没有注释？您不需要注释类。。。您需要注释类实例我的意思是，它应该是
@JsonProperty（“lat”）private double lat
和
@JsonProperty（“lng”）private double lng
，不是吗？此外，我必须使用ArrayList而不是List？如果名称匹配，则不需要注释（如本例所示）。关于ArrayList，我必须说这是我从以前的JSON解析器中使用的东西。请随意使用列表，因为它更实用。它应该也能用。伙计，你面前有所有的代码。。。按CTRL+C，然后按CTRL+V！您获取的JSON无效——很可能缺少某些内容。与数据绑定无关，异常直接来自流解析。这可能是jackson版本的问题？否。请阅读异常消息。版本不兼容会导致与类加载截然不同的错误。这表明JSON输入被破坏——我无法推测这是为什么。您可以通过首先读取和缓冲内容，然后将其交给解析器来解决这个问题——也许还可以记录输入以排除故障。
public class Coordinates {
    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;
    }

}

public class Geometry {
    private Coordinates location;

    @JsonProperty("location_type")
    private String locationType;

    private ViewPort viewport;

    public Coordinates getLocation() {
        return location;
    }

    public String getLocationType() {
        return locationType;
    }

    public ViewPort getViewport() {
        return viewport;
    }

    public static class ViewPort {
        private Coordinates northeast;
        private Coordinates southwest;

        public Coordinates getNortheast() {
            return northeast;
        }

        public Coordinates getSouthwest() {
            return southwest;
        }

    }
}

protected void performJackson() {
    new AsyncTask<Void, Void, Void>() {
        @Override
        protected Void doInBackground(Void... params) {
            try {
                String baseUrl = "http://maps.google.com/maps/api/geocode/json?latlng=47.3195254,5.0430687&sensor=true";
                HttpURLConnection connection = (HttpURLConnection) new URL(baseUrl).openConnection();
                ObjectMapper mapper = new ObjectMapper();
                // disable exceptions when there is unknown properties
                mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
                int statusCode = connection.getResponseCode();
                Log.d("SJackson", "Status : " + statusCode);
                if (statusCode == HttpURLConnection.HTTP_OK) { // 200
                    InputStream is = new BufferedInputStream(connection.getInputStream());
                    GeocoderResult result = mapper.readValue(is, GeocoderResult.class);
                    Log.d("SJackson", "Done: " + (result != null));
                }
            } catch (Exception ex) {
                Log.e("SJackson", null, ex);
            }

            return null;
        }
    }.execute();
}