具有变量JsonProperty的Jackson泛型（与泛型一起使用）

基于Jackson的响应-在运行时修改属性而无需
MichałZiober 进行注释，在这里，我可以通过重写PropertyNamingStrategy来更改默认字段名称值：

这些是我收到的JSON示例（简体）：

{"status": "OK","error": null,"data": {    "difficulties": [{"value":"easy"},{"value":"medium"}]}}{"status": "ok", "error": null, "data": {    "countries": [{"pre": "AT"},{"pre": "BE"}]}}

请参阅第二行的区别，其中数据对象包含困难或国家（或基于​​上下文的许多其他名称）。

基于JSON响应的响应类：

public class Response<T>{    private String status;    private String error;    private Data<T> data;    // Getters Setters Constructors}

基于JSON响应的数据类：

public class Data<T> {    // property name, that will be changed    @JsonProperty(DataNamingStrategy.DATA_FIELD)    private T[] data;    // Getters Setters Constructors}

这就是命名策略，它将默认值更改为运行时指定的值

public class DataNamingStrategy extends PropertyNamingStrategy{    // used by other classes (this will be default field name that should be changed)    public static final String DATA_FIELD = "variable:data";    private String fieldName;    public DataNamingStrategy(String fieldName) {        this.fieldName = fieldName;    }    // use this to change field name (format "variable":"value") not needed in my case    @Override    public String nameForField(MapperConfig<?> config, AnnotatedField field, String defaultName) {        return (defaultName.equals(DATA_FIELD))? fieldName : super.nameForField(config, field, defaultName);    }    // use this to change setter method field name (JSON -> Object with format "variable":{})    @Override    public String nameForSetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {        return (defaultName.equals(DATA_FIELD))? fieldName : super.nameForGetterMethod(config, method, defaultName);    }    // use this to change getter method field name (Object -> JSON with format "variable":{})    // should be same as nameForSetterMethod    @Override    public String nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {        return nameForSetterMethod(config, method, defaultName);    }}

用法应如下所示：

ObjectMapper mapper = new ObjectMapper();mapper.setPropertyNamingStrategy(new DataNamingStrategy(tableName));JavaType type = mapper.getTypeFactory().constructParametricType(Response.class, dataClass);Response<U> u = mapper.readValue(result, type);

其中

result

tableName

dataClass

U

更好的用法

PropertyNamingStrategy

Map

String

还可以查看

PropertyNamingStrategy