SpingMVC返回Json对象类型报异常

使用SpringMVC返回Json对象时，报 org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type 异常

    public @ResponseBody BaseResult login(String username, String password, String vercode) throws Exception {
        BaseResult br = new BaseResult();
        Manager manager = managerService.findByUsernameAndPassword(username,password);
        if (manager==null){
            br = new BaseResult("Error","用户名或密码错误");
        }
        return br;
    }

原因是，SpinGMVC无法将对象直接转换为Json对象，因此需要添加依赖。

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.5</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.5</version>
    </dependency>