org.thymeleaf.exceptions.TemplateInputException: Error resolving template "outlet/getVersion1", template might not exist or might not be accessible by any of the configured Template Resolvers] with root cause
org.thymeleaf.exceptions.TemplateInputException: Error resolving template "outlet/getVersion1", template might not exist or might not be accessible by any of the configured Template Resolvers
        at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:870)
        at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
        at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:354)
        at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:187)
        at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370)
        at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)

在前端调服务接口，返回结果为JSON，出现此异常
异常原因：
controller中注解@Controller 和@RestController，
前者，spring默认接口方法返回的是view对象（页面），在接口方法上如果不添加@ResponseBody（返回结果为具体Object），就会报上面错误。
后者，相当于@Controller+@ResponseBody的结合体，返回的是具体Object