fastjson数据返回配置

阿里的fastjson 包升级后，可能导致返回的json 数据，字段为null时不显示等问题

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.9.13</version>
</dependency>

@Configuration
public class FastjsonConfiguration {


  @Bean
  public HttpMessageConverters fastjsonConverter() {
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    //自定义格式化输出
    fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteNullNumberAsZero);

    FastJsonHttpMessageConverter4 fastjson = new FastJsonHttpMessageConverter4();
    fastjson.setFastJsonConfig(fastJsonConfig);
    return new HttpMessageConverters(fastjson);
  }

}

SerializerFeature  类的一些枚举值

    WriteMapNullValue,

    WriteNullListAsEmpty //  将list的null转成 []

    WriteNullStringAsEmpty // 将string的null转成 ""

    WriteNullNumberAsZero

    WriteNullBooleanAsFalse,

    PrettyFormat,

    WriteClassName,

    WriteDateUseDateFormat,

    NotWriteRootClassName,

    BeanToArray,

    WriteNonStringKeyAsString,

    NotWriteDefaultValue,
    
    BrowserSecure,
    
    IgnoreNonFieldGetter,

    WriteNonStringValueAsString,
    

  

springMVC 中设置

            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> 
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json</value>
                    </list>
                </property>
                <property name="features">
                    <list>
                        <value>WriteMapNullValue</value>
                        <value>QuoteFieldNames</value>
                    </list>
                </property>
               <!--  <property name="dateFormat" value="yyyy-MM-dd HH:mm:ss"/> -->
            </bean>

2、脱敏设置

1 ） 自定义 SensentiveField 类 实现  ObjectSerializer，并重写其方法
2） @JSONField(serializeUsing =SensentiveField.class) 实体类的属性加上 注解