JSON对应的maven依赖包

常用有三种json解析jackson、fastjson、gson。

1. jackson依赖包

   		<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
   
   	<dependency>
   
   	    <groupId>com.fasterxml.jackson.core</groupId>
   
   	    <artifactId>jackson-databind</artifactId>
   
   	    <version>2.9.3</version>
   
   	</dependency>
   
   	<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
   
   	<dependency>
   
   	    <groupId>com.fasterxml.jackson.core</groupId>
   
   	    <artifactId>jackson-core</artifactId>
   
   	    <version>2.9.3</version>
   
   	</dependency>
   
   	<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
   
   	<dependency>
   
   	    <groupId>com.fasterxml.jackson.core</groupId>
   
   	    <artifactId>jackson-annotations</artifactId>
   
   	    <version>2.9.3</version>
   
   	</dependency>
   
   

2. fastjson

   <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
   
   <dependency>
   
       <groupId>com.alibaba</groupId>
   
       <artifactId>fastjson</artifactId>
   
       <version>1.2.47</version>
   
   </dependency>
   
   

   遇到对象转json字符串时,如果对象中的属性字段为null，则不会显示出来。解决方法

   JSONObject.toJSONString(bean,SerializerFeature.WriteMapNullValue)

3. gson

   <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
   
   <dependency>
   
       <groupId>com.google.code.gson</groupId>
   
       <artifactId>gson</artifactId>
   
       <version>2.8.2</version>
   
   </dependency>