项目框架：spring+springmvc+mybatis
问题描述：前端ajax用post方式提交json数据给后端时，网络报错 415
前端异常信息：Failed to load resource: the server responded with a status of 415 (Unsupported Media Type)
后端异常信息：无
报错原因：缺少jackson包
类似问题注意点：
- springmvc添加配置、注解；
- pom.xml添加jackson包引用；
- Ajax请求时没有设置Content-Type为application/json
- 发送的请求内容不要转成JSON对象，直接发送JSON字符串即可
<!-- json解析包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.2</version>
</dependency>