使用SpringMVC 传递JSON字符串返回415问题

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今天在springMVC传递Json的时候,浏览器端返回一直为415
总结以下可能遇到的问题:
1.没有导入jar依赖包

<!-- 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><!-- 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>

2. <mvc:annotation-driven/>
不要自己定义解析器,否则还要单独配置
3.

<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
$(function(){alert();var params = '{"id": 1,"name": "测试商品","price": 99.9,"detail": "测试商品描述","pic": "123456.jpg"}';jqXHR = $.ajax({url : "${pageContext.request.contextPath }/json.action",data : params,contentType : "application/json;charset=UTF-8",//发送数据的格式type : "post",dataType : "json",//回调});jqXHR.done(function(data){alert(data.name);});
});