springboot访问方法时出错：Spring Boot Application: No converter found for return value of type

出错的原因是因为maven依赖的jar包没有json相关的jar包，需要引入相关json的jar包

<!-- 对象与JSON之间相互转换 --><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-core</artifactId>    <version>2.7.3</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.7.3</version></dependency><dependency>    <groupId>com.alibaba</groupId>    <artifactId>fastjson</artifactId>    <version>1.2.23</version></dependency>

Controller：

@RequestMapping("/say")public Users sayHello() {    Users users = new Users();    users.setId(0001);    users.setUserName("李白");    return users;}

显示的结果：

{"id":1,"userName":"李白"}
依赖json的包可以自动进行类型转换