慕运维8079593
您有非常复杂的有效负载，其中同一属性可以有一个或一个对象。 默认情况下不处理这种情况，我们需要为此类属性实现自定义 deserialiser。下面我创建了表示您的有效负载的简单模型：JSONJSON objectJSON arrayGsonone-or-manyPOJOJSONclass TestResponse { @SerializedName("test-run") private TestRun testRun; // other properties, getters, setters, toString}class TestRun { @SerializedName("test-suite") private List<TestSuite> testSuite; // other properties, getters, setters, toString}class TestSuite { private String result; private double duration; @SerializedName("test-suite") private List<TestSuite> testSuites; @SerializedName("test-case") private List<TestCase> testCases; // other properties, getters, setters, toString}class TestCase { private String fullname; // other properties, getters, setters, toString}如您所见，是 -es 属性。让我们为这些属性实现自定义 deserialiser：test-suitetest-caseListclass OneOrManyJsonDeserializer<E> implements JsonDeserializer<List<E>> { private final Class<E> clazz; public OneOrManyJsonDeserializer(Class<E> clazz) { this.clazz = clazz; } @Override public List<E> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { if (json instanceof JsonArray) { final JsonArray array = (JsonArray) json; final int size = array.size(); if (size == 0) { return Collections.emptyList(); } final List<E> suites = new ArrayList<>(size); for (int i = 0; i < size; i++) { suites.add(context.deserialize(array.get(i), clazz)); } return suites; } E suite = context.deserialize(json, clazz); return Collections.singletonList(suite); }}Class<E>在运行时需要正确反序列化给定 。之后，让我们创建并自定义实例：JSON objectGsonimport com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonArray;import com.google.gson.JsonDeserializationContext;import com.google.gson.JsonDeserializer;import com.google.gson.JsonElement;import com.google.gson.JsonParseException;import com.google.gson.annotations.SerializedName;import com.google.gson.reflect.TypeToken;import java.io.File;import java.io.FileReader;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class GsonApp { public static void main(String[] args) throws Exception { File jsonFile = new File("./resource/test.json").getAbsoluteFile(); Type testCaseListType = new TypeToken<List<TestCase>>() {}.getType(); Type testSuiteListType = new TypeToken<List<TestSuite>>() {}.getType(); Gson gson = new GsonBuilder() .registerTypeAdapter(testCaseListType, new OneOrManyJsonDeserializer<>(TestCase.class)) .registerTypeAdapter(testSuiteListType, new OneOrManyJsonDeserializer<>(TestSuite.class)) .setPrettyPrinting() .create(); TestResponse response = gson.fromJson(new FileReader(jsonFile), TestResponse.class); System.out.println(response); }}如您所见，我们为每种类型的注册了两个实例。我们需要使用来正确映射我们的实例。one-to-manyTypeToken版本 2在玩了上面的解决方案之后，我想出了下面的deserialiser：class OneOrManyJsonDeserializer implements JsonDeserializer<List<?>> { @Override public List<?> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { final Type elementType = $Gson$Types.getCollectionElementType(typeOfT, List.class); if (json instanceof JsonArray) { final JsonArray array = (JsonArray) json; final int size = array.size(); if (size == 0) { return Collections.emptyList(); } final List<?> suites = new ArrayList<>(size); for (int i = 0; i < size; i++) { suites.add(context.deserialize(array.get(i), elementType)); } return suites; } Object suite = context.deserialize(json, elementType); return Collections.singletonList(suite); }}我们不需要定制它。使用类，我们可以获得元素的类型并反序列化内部元素。简单用法：$Gson$Typesimport com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonArray;import com.google.gson.JsonDeserializationContext;import com.google.gson.JsonDeserializer;import com.google.gson.JsonElement;import com.google.gson.JsonParseException;import com.google.gson.annotations.SerializedName;import com.google.gson.internal.$Gson$Types;import java.io.File;import java.io.FileReader;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class GsonApp { public static void main(String[] args) throws Exception { File jsonFile = new File("./resource/test.json").getAbsoluteFile(); Gson gson = new GsonBuilder() .registerTypeAdapter(List.class, new OneOrManyJsonDeserializer()) .setPrettyPrinting() .create(); TestResponse response = gson.fromJson(new FileReader(jsonFile), TestResponse.class); System.out.println(response); }}上面的代码也应该适合你。