spring 3.x升级到Spring 4.x 依赖的相关 json jar 包加上即可。（注意事项和步骤）

参考：http://www.sojson.com/blog/145.html

<!-- Spring 升级4+ 依赖的JSON包 -->

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-databind</artifactId>

<version>2.7.4</version>

</dependency>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-core</artifactId>

<version>2.7.4</version>

</dependency>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-annotations</artifactId>

<version>2.7.4</version>

</dependency>

<!-- /Spring 升级4+ 依赖的JSON包 -->