使用Jackson 处理 null 或者 空字符串

objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

@JsonInclude(JsonInclude.Include.NON_NULL)

public static JacksonConverterFactory create() {
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule module = new SimpleModule();
        module.addDeserializer(String.class, new CustomStringDeserializer());
        objectMapper.registerModule(module);
        return create(objectMapper);
    }

public class CustomStringDeserializer extends JsonDeserializer<String> {
    @Override
    public String deserialize(JsonParser jsonparser,
                              DeserializationContext deserializationcontext) throws IOException,
            JsonProcessingException {
        return jsonparser.getText();
    }
    @Override
    public String getNullValue() {
        return "-";
    }
}

public class CustomClassDeserializer extends JsonDeserializer<T> {
    @Override
    public T deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        return null;
    }
}

@JsonDeserialize(using = CustomClassDeserializer.class)
class yourClass()

@JsonDeserialize(using = CustomStringDeserializer.class)
private String name;

public class MyJsonMapper extends ObjectMapper{
  public MyJsonMapper(){
    super();
    this.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {  
      @Override  
      public void serialize(Object value, JsonGenerator jg, SerializerProvider sp) throws IOException, JsonProcessingException {  
          jg.writeString("");  
      }  
    }); 
  }
}

<bean id="jacksonMapper" class="com.tyky.eduplat.reslib.infrastructure.MyJsonMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg value="yyyy-MM-dd HH:mm:ss"/>
</bean>
</property>
</bean> 
<bean id="jacksonProvider" class="com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider">
<constructor-arg ref="jacksonMapper" />
</bean>