SpringMVC-Jackson

SpringMVC集成Jackson即为由Jackson来反序列化@RequestBody中的内容，序列化@ResponseBody中的内容。

jackson使用介绍

Jar依赖

<!--jackson-->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

添加Jar依赖默认就已经使用Jackson来反序列化和序列化，但通常我们还需要对Jackson做一些配置。

自定义配置的ObjectMapper

自定义一个ObjectMapper，继承于Jackson的ObjectMapper

public class CustomObjectMapper extends ObjectMapper {

    public CustomObjectMapper() {
        super();

        //去掉默认的时间戳格式
        configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        //设置为东八区
        setTimeZone(TimeZone.getTimeZone("GMT+8"));
        //设置日期转换yyyy-MM-dd HH:mm:ss
        setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

        // 设置输入:禁止把POJO中值为null的字段映射到json字符串中
        configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
        //空值不序列化
        setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 反序列化时，属性不存在的兼容处理
        getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        // 序列化枚举是以toString()来输出，默认false，即默认以name()来输出
        configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
    }
}

配置自定义的ObjectMapper

<mvc:annotation-driven>

    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <!-- 自定义Jackson的objectMapper -->
            <property name="objectMapper" ref="customObjectMapper" />
            <property name="supportedMediaTypes">
                <list>
                    <value>text/plain;charset=UTF-8</value>
                    <value>application/json;charset=UTF-8</value>
                </list>
            </property>
        </bean>
    </mvc:message-converters>

</mvc:annotation-driven>

<bean name="customObjectMapper" class="com.zmx.CustomObjectMapper"/>