ProtoBean 与 JavaBean相互转换

原理

• ProtoBean -> Json -> Java Bean
• JavaBean -> Json -> ProtoBean

工具

• jackson-datatype-protobuf ：是 Jackson 对 Protobuf 转换成 Json 格式的支持

<dependency>
    <groupId>com.hubspot.jackson</groupId>
    <artifactId>jackson-datatype-protobuf</artifactId>
    <version>0.9.12</version>
</dependency>

代码

/**
 * ProtoBean 和 Java Bean 之间的转换
 */
public enum ProtoBeanUtils {

    INSTANCE;

    private static final ObjectMapper MAPPER = new ObjectMapper();

    static {
        // 注册对protobuf的支持
        MAPPER.registerModule(new ProtobufModule());

        // 忽略属性大小写
        //mapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);

        // Enum -> Integer
        MAPPER.configure(SerializationFeature.WRITE_ENUMS_USING_INDEX, true);
        // 允许单引号
        //mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);

        // 解析 json 时，字段名可以不用引号
        //mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);

        // 生成 json 时，忽略不存在字段
        MAPPER.configure(JsonGenerator.Feature.IGNORE_UNKNOWN, true);

        // 使用下划线命名法
        MAPPER.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);

        // 只序列化非空字段
        MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        // 忽略字段变动
        MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        // 直接读取字段，不走 getter/setter 方法
        MAPPER.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
        MAPPER.setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.NONE);
        MAPPER.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE);
        MAPPER.setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.NONE);
    }

    public <T> T convert(Object o, Class<T> clazz) {
        long startTime = System.currentTimeMillis();
        try {
            return MAPPER.convertValue(o, clazz);
        }finally {
            long endTime = System.currentTimeMillis();
            System.out.println("本次转化耗时:"+(endTime - startTime));
        }
    }
}

ProtoBean 与 JavaBean相互转换

原文：https://www.cnblogs.com/gingo/p/14868158.html