去除多余的null的key ，修正kafka的broker地址

src/main/java/com/gzzn/omms/msgexchangeapi/config/JacksonConfig.java

@@ -0,0 +1,23 @@
+package com.gzzn.omms.msgexchangeapi.config;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+@Configuration
+public class JacksonConfig {
+
+	@Bean
+    @Primary
+    @ConditionalOnMissingBean(ObjectMapper.class)
+    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
+        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
+        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+        return objectMapper;
+    }
+}