[英]How to serialize an object to a list of one elements with gson
I have some json string like this:我有一些这样的 json 字符串:
example1例子1
{ "path":{ "start":"abc" }, "name":"Fork1" }
example2例子2
{ "path":[{ "start":"abc" }, { "start":"def" }], "name":"Fork1" }
and I want to serialize with one JAVA object like this:我想用这样的一个JAVA 对象进行序列化:
@Data
public static class ForkNode {
private List<Path> path;
private String name;
}
@Data
public static class Path {
private String start;
}
new Gson().fromJson(jsonStr, ForkNode.class)
but it will throw an exception IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 2 column 11 path $.path
但它会抛出异常
IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 2 column 11 path $.path
So how do I treat the first example as a list of one elements?那么如何将第一个示例视为一个元素的列表呢? Or is there any way I can serialize two different types of json strings with one object?
或者有什么方法可以用一个对象序列化两种不同类型的 json 字符串?
I don't think it is a good way to serialize two different types of json strings with ONE object.我认为用ONE对象序列化两种不同类型的 json 字符串不是一种好方法。
For example 1, the Object should be like this:例如1,对象应该是这样的:
@Data
public static class ForkNode {
// only one path
private Path path;
private String name;
}
@Data
public static class Path {
private String start;
}
new Gson().fromJson(jsonStr, ForkNode.class)
While For example 2, the Object should be like this:而例如2,对象应该是这样的:
@Data
public static class ForkNode {
// several paths
private List<Path> path;
private String name;
}
@Data
public static class Path {
private String start;
}
new Gson().fromJson(jsonStr, ForkNode.class)
In JSON:在 JSON 中:
One more thing, If you do really want to do that, I think you need to implement a custom deserializer by yourself.还有一件事,如果你真的想这样做,我认为你需要自己实现一个自定义的反序列化器。 Please ref the doc of Gson.
请参考 Gson 的文档。
I solved it by modify JsonObject.我通过修改 JsonObject 解决了它。 I use this code to convent JsonObject to JsonArray, so I can deserializer it like JsonArray.
我使用此代码将 JsonObject 转换为 JsonArray,因此我可以像 JsonArray 一样反序列化它。
public void objectToArray(JsonObject jsonObject, String node) {
JsonElement jsonElement = jsonObject.get(node);
if (jsonElement instanceof JsonObject) {
JsonArray array = new JsonArray();
array.add(jsonElement);
jsonObject.remove(node);
jsonObject.add(node, array);
}
}
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