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问题描述
我有以下的类
public class MyClass {
private List< MyOtherClass>其他;
}
public class MyOtherClass {
private String name;
}
我的JSON可能看起来像这样
{
others:{
name:val
}
}
或者这个
{
其他:[
{
名称:val
},
{
名称:val
}
]
}
我希望能够使用相同的 MyClass
这两种JSON格式。有没有办法与Gson做到这一点?
解决方案
我想出了一个答案。
private static class MyOtherClassTypeAdapter implements JsonDeserializer< List< MyOtherClass>> {
公共列表< MyOtherClass>反序列化(JsonElement json,类型typeOfT,JsonDeserializationContext ctx){
List< MyOtherClass> vals = new ArrayList< MyOtherClass>(); (),
if(json.isJsonArray()){
for(JsonElement e:json.getAsJsonArray()){
vals.add((MyOtherClass)ctx.deserialize(e,MyOtherClass.class) );
} else if(json.isJsonObject()){
vals.add((MyOtherClass)ctx.deserialize(json,MyOtherClass.class));
} else {
throw new RuntimeException(Unexpected JSON type:+ json.getClass());
}
返回vals;
$ b $ p $实例化一个像这样的Gson对象$ / $ p
键入myOtherClassListType = new TypeToken< List< MyOtherClass>>(){} .getType();
Gson gson = new GsonBuilder()
.registerTypeAdapter(myOtherClassListType,new MyOtherClassTypeAdapter())
.create();
TypeToken
是一个 com.google.gson.reflect.TypeToken
。
您可以在此阅读有关解决方案:
I've got the following classes
public class MyClass {
private List<MyOtherClass> others;
}
public class MyOtherClass {
private String name;
}
And I have JSON that may look like this
{
others: {
name: "val"
}
}
or this
{
others: [
{
name: "val"
},
{
name: "val"
}
]
}
I'd like to be able to use the same MyClass
for both of these JSON formats. Is there a way to do this with Gson?
解决方案 I came up with an answer.
private static class MyOtherClassTypeAdapter implements JsonDeserializer<List<MyOtherClass>> {
public List<MyOtherClass> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext ctx) {
List<MyOtherClass> vals = new ArrayList<MyOtherClass>();
if (json.isJsonArray()) {
for (JsonElement e : json.getAsJsonArray()) {
vals.add((MyOtherClass) ctx.deserialize(e, MyOtherClass.class));
}
} else if (json.isJsonObject()) {
vals.add((MyOtherClass) ctx.deserialize(json, MyOtherClass.class));
} else {
throw new RuntimeException("Unexpected JSON type: " + json.getClass());
}
return vals;
}
}
Instantiate a Gson object like this
Type myOtherClassListType = new TypeToken<List<MyOtherClass>>() {}.getType();
Gson gson = new GsonBuilder()
.registerTypeAdapter(myOtherClassListType, new MyOtherClassTypeAdapter())
.create();
That TypeToken
is a com.google.gson.reflect.TypeToken
.
You can read about the solution here:
https://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and-Deserializing-Gener
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