完善修正xml转json消息的问题。

src/main/java/com/gzzn/omms/msgexchangeapi/utils/JsonUtil.java

@@ -2,6 +2,7 @@ package com.gzzn.omms.msgexchangeapi.utils;
 
 import java.io.IOException;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonMappingException;
@@ -22,6 +23,26 @@ public class JsonUtil {
 	}
   } //end function
   
+  /**
+   * 获取json字符串去除值为null的key
+   * @param object
+   * @return json字符串
+   */
+  public static String getStringWithNoneKey(Object object) 
+  {
+	try {
+		ObjectMapper mapper = new ObjectMapper();
+		mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+		
+	    ObjectWriter ow = mapper.writer().withDefaultPrettyPrinter();
+	    java.lang.String jsonStr;
+		jsonStr = ow.writeValueAsString(object);
+	    return jsonStr;
+	} catch (JsonProcessingException e) {
+		throw new RuntimeException(e);
+	}
+  } //end function
+  
   
   public static <T>  T getObject(String str,Class<T> valueType) throws JsonParseException, JsonMappingException, IOException
   {