首先看下面的代码
@Controller
@RequestMapping("/users")
public class UserController {
@RequestMapping(method=RequestMethod.GET)
public HttpResponse getList(HttpServletRequest req,HttpServletResponse rep){
String id = req.getSession().getId();
return new HttpResponse(id);
}
}
在通过ajax访问的时候会出现
javax.servlet.ServletException: Circular view path [users]: would dispatch back to the current handler URL [/users] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)
这个异常,它的意思是没有指定视图结果,让你检查一下你的视图配置,在springmvc中我们是使用viewResolver,通过在controller中return的前缀来决定跳转到相应的视图
那么在springBoot怎么解决这个问题?
两个方案:
1、添加@ResponseBody
@Controller
@RequestMapping("/users")
public class UserController {
@RequestMapping(method=RequestMethod.GET)
@ResponseBody
public HttpResponse getList(HttpServletRequest req,HttpServletResponse rep){
String id = req.getSession().getId();
return new HttpResponse(id);
}
}
2、将@Controller换成@RestController// 标记为:restful
@RestController
@RequestMapping("/users")
public class UserController {
@RequestMapping(method=RequestMethod.GET)
public HttpResponse getList(HttpServletRequest req,HttpServletResponse rep){
String id = req.getSession().getId();
return new HttpResponse(id);
}
}
Controller源码类
org.springframework.stereotype.Controller
RestController源码类
org.springframework.web.bind.annotation.RestController
两者区别在于
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ok