controller的使用

@controller：处理http请求

@restcontroller：==@controller和@requestbody

@requestmapping配置url映射 

（1）都能访问到该方法：@RequestMapping(value = {"/demo1","/demo2"},method = RequestMethod.GET)

（2）在整个controller上指定一个路径，拼接访问。

传参数

（1）@PathVariable

举例：

@RequestMapping(value = "demo/{id}",method = RequestMethod.GET)

@RequestMapping(value = "{id}/demo",method = RequestMethod.GET)

public String Say(@PathVariable("id") String id){
   //Man man=new Man();
   // man.setAge("25");
   // man.setName("hahahaha");
    return "id:"+id;
}

（2）@RequestParam还可以设置默认值

@RequestParam(value = "id",required = false,defaultValue = "0")

// @RequestMapping(value = "/demo",method = RequestMethod.GET)
 @GetMapping("/demo")

 @PostMapping("/")组合注解