Java Gson:字段命名策略 FieldNamingPolicy


#Java Gson


简介

有多种命名策略:

  • FieldNamingPolicy.IDENTITY
  • FieldNamingPolicy.UPPER_CAMEL_CASE
  • FieldNamingPolicy.UPPER_CAMEL_CASE_WITH_SPACES
  • FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES
  • 等等

具体可以参看源码。

代码示例

示例:字段命名使用小写字母和下划线

package org.example;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import lombok.Data;
import org.junit.jupiter.api.Test;

public class TestGson {

    @Data
    public static class UserInfo {
        private String useName;
    }

    @Test
    public void test_01() {
        GsonBuilder gsonBuilder = new GsonBuilder();
        Gson gson = gsonBuilder
                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
                .create();
        UserInfo userInfo = new UserInfo();
        userInfo.setUseName("李白");
        String jsonStr = gson.toJson(userInfo);
        System.out.println(jsonStr);
        // 以上代码输出: {"use_name":"李白"}
    }


    @Test
    public void test_02() {
        GsonBuilder gsonBuilder = new GsonBuilder();
        Gson gson = gsonBuilder
                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
                .create();
        UserInfo userInfo = gson.fromJson("{\"use_name\":\"李白\"}", UserInfo.class);
        System.out.println(userInfo);
        // 以上代码输出: TestGson.UserInfo(useName=李白)
    }

}

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