java spring boot jackson 配置 null字符串为"" null数组为[]-白红宇

java spring boot jackson 配置 null字符串为"" null数组为[]

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发布时间：2019-05-10

本文共 1845 字，大约阅读时间需要 6 分钟。

如果后端字段为null 前端经常判断null也是挺麻烦的

配置jackso可以达到

把字符串null转为""

null数组转为[]

添加两种处理null的方法。你也可以添加更多比如int为null的处理、布尔为null的处理等

public class CustomJsonSerializer {
     public static class CollectionSerializer extends JsonSerializer

配置jackson

@Configurationpublic class JacksonConfig {
     @Bean  @Primary  @ConditionalOnMissingBean(ObjectMapper.class)  public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
       ObjectMapper objectMapper = builder.createXmlMapper(false).build();    objectMapper.setSerializerFactory(objectMapper.getSerializerFactory().withSerializerModifier(new BeanSerializerModifier() {
         @Override      public List
   
     changeProperties(SerializationConfig config, BeanDescription beanDesc, List
    
      beanProperties) {
           for (BeanPropertyWriter beanProperty : beanProperties) {
             Class clazz = beanProperty.getType().getRawClass();          //判断类型          if (clazz.isArray()) {
               beanProperty.assignNullSerializer(new CustomJsonSerializer.CollectionSerializer());          } else if (clazz == String.class) {
               beanProperty.assignNullSerializer(new CustomJsonSerializer.StringSerializer());          }        }        return beanProperties;      }    }));    return objectMapper;  }}

配置结束这样前端对于这两种就不用再判断null了

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