在Gson中,可以通過自定義FieldNamingStrategy
來實(shí)現(xiàn)不同的字段命名策略。以下是一個(gè)簡(jiǎn)單的示例,展示了如何實(shí)現(xiàn)一個(gè)將下劃線命名轉(zhuǎn)換為駝峰命名的FieldNamingStrategy
:
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public class Main {
public static void main(String[] args) {
// 創(chuàng)建一個(gè)自定義的FieldNamingStrategy
FieldNamingStrategy fieldNamingStrategy = new FieldNamingPolicy() {
@Override
public String translateName(String fieldName) {
StringBuilder translatedName = new StringBuilder();
boolean shouldCapitalize = true;
for (char c : fieldName.toCharArray()) {
if (Character.isUnderscore(c)) {
shouldCapitalize = true;
} else if (shouldCapitalize) {
translatedName.append(Character.toUpperCase(c));
shouldCapitalize = false;
} else {
translatedName.append(c);
}
}
return translatedName.toString();
}
};
// 使用自定義的FieldNamingStrategy創(chuàng)建Gson實(shí)例
Gson gson = new GsonBuilder()
.setFieldNamingPolicy(fieldNamingStrategy)
.create();
// 測(cè)試數(shù)據(jù)
Person person = new Person("John", "Doe");
// 轉(zhuǎn)換為JSON字符串
String jsonString = gson.toJson(person);
System.out.println(jsonString); // 輸出: {"firstName":"John","lastName":"Doe"}
}
}
class Person {
private String firstName;
private String lastName;
public Person(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
// getter和setter方法
}
在這個(gè)示例中,我們創(chuàng)建了一個(gè)自定義的FieldNamingStrategy
,它將下劃線命名的字段轉(zhuǎn)換為駝峰命名。然后,我們使用GsonBuilder
將這個(gè)自定義策略應(yīng)用到Gson實(shí)例中。最后,我們使用這個(gè)Gson實(shí)例將一個(gè)包含下劃線命名的Person
對(duì)象轉(zhuǎn)換為JSON字符串。