spring:
 jackson:
  #日期格式化
  date-format: yyyy-MM-dd HH:mm:ss
  serialization:
    #格式化輸出 
   indent_output: true
   #忽略無法轉(zhuǎn)換的對象
   fail_on_empty_beans: false
  #設(shè)置空如何序列化
  defaultPropertyInclusion: NON_EMPTY
  deserialization:
   #允許對象忽略json中不存在的屬性
   fail_on_unknown_properties: false
  parser:
   #允許出現(xiàn)特殊字符和轉(zhuǎn)義符
   allow_unquoted_control_chars: true
   #允許出現(xiàn)單引號
   allow_single_quotes: true

@Bean
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
  {
    ObjectMapper objectMapper = builder.createXmlMapper(false).build();

    // 通過該方法對mapper對象進(jìn)行設(shè)置，所有序列化的對象都將按改規(guī)則進(jìn)行系列化
    // Include.Include.ALWAYS 默認(rèn)
    // Include.NON_DEFAULT 屬性為默認(rèn)值不序列化
    // Include.NON_EMPTY 屬性為 空（""） 或者為 NULL 都不序列化，則返回的json是沒有這個(gè)字段的。這樣對移動(dòng)端會(huì)更省流量
    // Include.NON_NULL 屬性為NULL 不序列化
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    // 允許出現(xiàn)特殊字符和轉(zhuǎn)義符
    objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
    // 允許出現(xiàn)單引號
    objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
    // 字段保留，將null值轉(zhuǎn)為""
    objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>()
    {
      @Override
      public void serialize(Object o, JsonGenerator jsonGenerator,
                 SerializerProvider serializerProvider)
          throws IOException
      {
        jsonGenerator.writeString("");
      }
    });
    return objectMapper;
  }