如何在 Java 中使用 Gson 实现自定义 FieldNamingStrategy?
javajsonobject oriented programmingprogramming
FieldNamingStrategy 是一种在 Gson 中提供自定义字段命名的机制。这允许客户端代码将字段名称转换为常规 Java 字段声明规则不支持的特定约定。translateName() 方法将在每个字段名称前加上字符串"pre_"作为前缀。
在下面的示例中，我们可以实现自定义 FieldNamingStrategy。
示例
import java.lang.reflect.Field;
import com.google.gson.*;
public class GsonFieldNamingStrategyTest {
public static void main(String[] args) {
Employee emp = new Employee();
emp.setEmpId(115);
emp.setFirstName("Adithya");
emp.setLastName("Jai");
CustomFieldNamingStrategy customFieldNamingStrategy = new CustomFieldNamingStrategy();
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.setFieldNamingStrategy(customFieldNamingStrategy).create();
String result = gson.toJson(emp);
System.out.println(result);
}
// Custom FieldNamingStrategy
private static class CustomFieldNamingStrategy implements FieldNamingStrategy {
@Override
public String translateName(Field field) {
return "pre_" + field.getName();
}
}
}
// Employee class
class Employee {
private int empId;
private String firstName;
private String lastName;
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
输出
{"pre_empId":115,"pre_firstName":"Adithya","pre_lastName":"Jai"}
