Java 对象序列化为 JSON（使用 Gson）。如何在 UpperCamelCase 中设置字段名称？
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Object Serialization to JSON (using Gson). How to set field names in UpperCamelCase?
提问by Frank59
I need to serialize a list of simple Java objects to JSON using Google Gson library.
我需要使用 Google Gson 库将简单 Java 对象列表序列化为 JSON。
The object:
物体：
public class SimpleNode {
private String imageIndex;
private String text;
public String getImageIndex() {
return imageIndex;
}
public void setImageIndex(String imageIndex) {
this.imageIndex = imageIndex;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
I have written the following code for serialization:
我已经编写了以下用于序列化的代码：
List<SimpleNode> testNodes = repository.getElements(0);
Gson gson = new Gson();
String jsonNodesAsString = gson.toJson(testNodes);
It works, but the field name of the JSON objects is lowerCamelCase. Like this:
它可以工作，但 JSON 对象的字段名称是 lowerCamelCase。像这样：
[
{
"imageIndex": "1",
"text": "Text 1"
},
{
"imageIndex": "2",
"text": "Text 2"
}
]
How do I get a JSON with UpperCamelCase field name, like this:
如何获得带有 UpperCamelCase 字段名称的 JSON，如下所示：
[
{
"ImageIndex": "1",
"Text": "Text 1"
},
{
"ImageIndex": "2",
"Text": "Text 2"
}
]
I think that I can rename member variables in to UpperCamelCase, but may be there is another way?
我认为我可以将成员变量重命名为 UpperCamelCase，但可能还有其他方法吗？
采纳答案by Ben Dale
Taken from the docs:
取自文档：
Gson supports some pre-defined field naming policies to convert the standard Java field names (i.e. camel cased names starting with lower case --- "sampleFieldNameInJava") to a Json field name (i.e. sample_field_name_in_java or SampleFieldNameInJava). See the FieldNamingPolicy class for information on the pre-defined naming policies.
Gson 支持一些预定义的字段命名策略，可以将标准的 Java 字段名称（即以小写开头的驼峰式名称---“sampleFieldNameInJava”）转换为 Json 字段名称（即 sample_field_name_in_java 或 SampleFieldNameInJava）。有关预定义命名策略的信息，请参阅 FieldNamingPolicy 类。
It also has an annotation based strategy to allows clients to define custom names on a per field basis. Note, that the annotation based strategy has field name validation which will raise "Runtime" exceptions if an invalid field name is provided as the annotation value.
它还具有基于注释的策略，允许客户在每个字段的基础上定义自定义名称。请注意，基于注释的策略具有字段名称验证，如果提供无效字段名称作为注释值，则会引发“运行时”异常。
The following is an example of how to use both Gson naming policy features:
以下是如何使用 Gson 命名策略功能的示例：
private class SomeObject {
@SerializedName("custom_naming")
private final String someField;
private final String someOtherField;
public SomeObject(String a, String b) {
this.someField = a;
this.someOtherField = b;
}
}
SomeObject someObject = new SomeObject("first", "second");
Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).create();
String jsonRepresentation = gson.toJson(someObject);
System.out.println(jsonRepresentation);
======== OUTPUT ========
======== 输出 ========
{"custom_naming":"first","SomeOtherField":"second"}
However, for what you want, you could just use this:
但是，对于你想要的，你可以使用这个：
Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).create();
By using the UPPER_CAMEL_CASE option, you'll achieve your goal.
通过使用 UPPER_CAMEL_CASE 选项，您将实现您的目标。
