Spring视图解析器（ViewResolve）视图解析器会将Controller中String的返回值（视图名）进行拼串。@Controller
public class HelloController{
@RequestMapping("/hello")
public String hello(){
return "../../hello";
}
}//
SpringMVC自动配置
１.SpringBoot官方文档对SpringMVC的默认配置：Inclusion of ContentNegotiatingViewResolver and BeanNameViewResolver beans.自动配置了ViewResolver（视图解析器：根据方法返回值得到视图对象，试图对象决定如何渲染）
ContentNegotiatingViewResolve
