Question

我正在尝试从XML文件中提取数据。将XML转换为JSON后，我无法访问数据。我正在用GSON解析数据。

此代码段给我一个错误。

任何建议？提前谢谢。

 Type collectionType = new TypeToken<Collection<PldData.DataClass>>(){}.getType();
 Collection<PldData.DataClass> enums = gson.fromJson(jsonObj.toString(),collectionType);
 final PldData.DataClass [] location = enums.toArray(new PldData.DataClass[enums.size()]);

这是JSON内容：

{
    "data": {
        "-ver": "12",
        "Nets": {
            "-ver": "13",
            "Net": [
                {
                    "-IdAliasZone": "alias",
                    "-FullDomain": "www.example.com",
                    "-PubIp": "www.example.com",
                    "-RemMode": "0",
                    "Device": [
                        {
                            "-IdAliasDevice": "alias2",
                            "-Description": "Hello ",
                            "-IdType": "asd",
                            "-Type": "123",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "asd",
                            "-Description": "desc",
                            "-IdType": "2",
                            "-Type": "6",
                            "-LocalUrl": "www.example.com",
                            "-RemotePort": "89",
                            "-Mac": "AA:AA:AA:AA:AA",
                            "-Status": "asd",
                            "-Version": "1",
                            "-Uptime": "123",
                            "Plants": {
                                "Plant1": {
                                    "-Description": "1",
                                    "-Enable": "1"
                                },
                                "Plant2": {
                                    "-Description": "2",
                                    "-Enable": "1"
                                },
                                "Plant3": {
                                    "-Description": "3",
                                    "-Enable": "1"
                                },
                                "Plant4": {
                                    "-Description": "I4",
                                    "-Enable": "1"
                                }
                            }
                        },
                        {
                            "-IdAliasDevice": "asd",
                            "-Description": "qwe",
                            "-IdType": "1",
                            "-Type": "123",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "123",
                            "-Description": "asd",
                            "-IdType": "2",
                            "-Type": "12",
                            "-LocalUrl": "www.example.com",
                            "-RemotePort": "12",
                            "-Mac": "0asd",
                            "Plants": {
                                "Plant1": {
                                    "-Description": "1",
                                    "-Enable": "1"
                                },
                                "Plant2": {
                                    "-Description": "2",
                                    "-Enable": "1"
                                },
                                "Plant3": {
                                    "-Description": "3",
                                    "-Enable": "1"
                                },
                                "Plant4": {
                                    "-Description": "4",
                                    "-Enable": "1"
                                }
                            }
                        },
                        {
                            "-IdAliasDevice": "asd",
                            "-Description": "asd-da",
                            "-IdType": "1",
                            "-Type": "254",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "223",
                            "-Description": "123",
                            "-IdType": "2",
                            "-Type": "64",
                            "-LocalUrl": "www.example.com",
                            "-RemotePort": "84",
                            "-Mac": "AA:AA:AA:AA:AA",
                            "-Status": "2",
                            "-Version": "41",
                            "-Uptime": "3",
                            "Plants": {
                                "Plant1": {
                                    "-Description": " 1",
                                    "-Enable": "1"
                                },
                                "Plant2": {
                                    "-Description": " 2",
                                    "-Enable": "1"
                                },
                                "Plant3": {
                                    "-Description": " 3",
                                    "-Enable": "1"
                                },
                                "Plant4": {
                                    "-Description": " 4",
                                    "-Enable": "1"
                                }
                            }
                        },
                        {
                            "-IdAliasDevice": "asd",
                            "-Description": "www.example.com",
                            "-IdType": "1",
                            "-Type": "254",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "a",
                            "-Description": "e",
                            "-IdType": "1",
                            "-Type": "254",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "d",
                            "-Description": "adsa",
                            "-IdType": "1",
                            "-Type": "254",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "123",
                            "-Description": "MAC",
                            "-IdType": "1",
                            "-Type": "25124",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "124",
                            "-Description": "WINDOWS",
                            "-IdType": "1",
                            "-Type": "2523",
                            "-LocalUrl": "www.example.com"
                        },
                        {
                            "-IdAliasDevice": "125",
                            "-Description": "WC",
                            "-IdType": "1",
                            "-Type": "254",
                            "-LocalUrl": "www.example.com",
                            "-RemotePort": "83"
                        }

                    ]
                },
                {
                    "-IdAliasZone": "123",
                    "-FullDomain": "www.example.com",
                    "-PubIp": "www.example.com",
                    "-RemMode": "1",
                    "Device": [
                        {
                            "-IdAliasDevice": "asd",
                            "-Description": "desc2",
                            "-IdType": "21",
                            "-Type": "642",
                            "-LocalUrl": "www.example.com",
                            "-RemotePort": "82",
                            "-Mac": "AAAAAAAAA",
                            "Plants": {
                                "Plant1": {
                                    "-Description": "1",
                                    "-Enable": "1"
                                },
                                "Plant2": {
                                    "-Description": "2",
                                    "-Enable": "1"
                                },
                                "Plant3": {
                                    "-Description": "3",
                                    "-Enable": "1"
                                },
                                "Plant4": {
                                    "-Description": "4",
                                    "-Enable": "1"
                                }
                            }
                        }
                    ]
                }
            ]
        }
    }
}

这是以下课程：

public class PldData {

    private DataClass data;

    public DataClass getData() {
        return data;
    }

    public void setData(DataClass data) {
        this.data = data;
    }

    public static class DataClass {

        @SerializedName("-ver")
        private String ver;

        private NetsClass Nets;

        private ObserverAreaClass ObserverArea;

        public String getVer() {
            return ver;
        }

        public void setVer(String ver) {
            this.ver = ver;
        }

        public NetsClass getNets() {
            return Nets;
        }

        public void setNets(NetsClass Nets) {
            this.Nets = Nets;
        }

        public ObserverAreaClass getObserverArea() {
            return ObserverArea;
        }

        public void setObserverArea(ObserverAreaClass ObserverArea) {
            this.ObserverArea = ObserverArea;
        }

        public static class NetsClass {

            @SerializedName("-ver")
            private String ver;

            private List<NetClass> Net;

            public String getVer() {
                return ver;
            }

            public void setVer(String ver) {
                this.ver = ver;
            }

            public List<NetClass> getNet() {
                return Net;
            }

            public void setNet(List<NetClass> Net) {
                this.Net = Net;
            }

            public static class NetClass {

                @SerializedName("-IdAliasZone")
                private String IdAliasZone;

                @SerializedName("-FullDomain")
                private String FullDomain;

                @SerializedName("-PubIp")
                private String PubIp;

                @SerializedName("-RemMode")
                private String RemMode;

                /***** with getter and setter   ****/
            }
        }
    }
}//END CLASS

Answer 1

你的json只出现一个对象，所以你应该使用

PldData pldData = new Gson().fromJson(jsonString, PldData.class);

更新：我尝试了一个包含资源和工作的干净项目。看截图。

Answer 2

我认为问题是您的ObserverAreaClass中有一个DataClass，这在您的JSON架构中不存在。

从DataClass中移除此字段，它应该可以正常工作。如果您在DataClass中需要此课程，则应使用ExclusionStrategy：

public @interface Exclude {}

// Excludes any field (or class) that is tagged with an "@Exclude" annotation
private static class ExcludeAnnotationExclusionStrategy implements ExclusionStrategy {
    public boolean shouldSkipClass(Class<?> clazz) {
        return clazz.getAnnotation(Exclude.class) != null;
    }

    public boolean shouldSkipField(FieldAttributes f) {
        return f.getAnnotation(Exclude.class) != null;
    }
}

然后您可以将此ExclusionStrategy添加到您的GSON对象：

Gson gson = new GsonBuilder().setExclusionStrategies(new ExcludeAnnotationExclusionStrategy()).build();

您可以使用此批注对ObserverAreaClass字段进行批注，以将其从反序列化（和序列化）中排除：

@Exclude private ObserverAreaClass observerArea;

Answer 3

它就像一个魅力

JsonParser jsonParser = new JsonParser(); JsonObject idAlias = jsonParser.parse(jsonObj.toString()).getAsJsonObject(); String version = idAlias.get("ver").getAsString(); Log.d(TAG, "onSuccess: Version" + version);

Gson：预计BEGIN_ARRAY但是BEGIN_OBJECT

3 个答案: