优化Jackson的MAPPER配置：DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT=true

src/main/java/cn/quantgroup/xyqb/config/http/HttpConfig.java

 package cn.quantgroup.xyqb.config.http;
 
-import cn.quantgroup.tech.brave.service.ITechHttpClient;
-import com.fasterxml.jackson.annotation.JsonInclude;
-import com.fasterxml.jackson.databind.DeserializationFeature;
-import com.fasterxml.jackson.databind.SerializationFeature;
+import java.security.KeyManagementException;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.text.SimpleDateFormat;
+
+import javax.annotation.Resource;
+import javax.net.ssl.SSLContext;
+
 import org.apache.http.client.HttpRequestRetryHandler;
 import org.apache.http.client.config.CookieSpecs;
 import org.apache.http.config.Registry;
@@ -25,6 +29,7 @@ import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.apache.http.impl.cookie.BestMatchSpecFactory;
 import org.apache.http.impl.cookie.BrowserCompatSpec;
 import org.apache.http.impl.cookie.BrowserCompatSpecFactory;
+
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -34,12 +39,11 @@ import org.springframework.format.support.FormattingConversionService;
 import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 import org.springframework.web.filter.CharacterEncodingFilter;
 
-import javax.annotation.Resource;
-import javax.net.ssl.SSLContext;
-import java.security.KeyManagementException;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.text.SimpleDateFormat;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.SerializationFeature;
+
+import cn.quantgroup.tech.brave.service.ITechHttpClient;
 
 /**
  * Created by Miraculous on 15/7/12.
@@ -79,7 +83,8 @@ public class HttpConfig {
                 .defaultViewInclusion(false)
                 .serializationInclusion(JsonInclude.Include.NON_NULL)
                 .featuresToEnable(SerializationFeature.WRITE_ENUMS_USING_INDEX,
-                        DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS);
+                        DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS,
+                        DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
         return builder;
     }