springBoot Controller的使用

注解作用@Controller处理http请求@RestControllerSpring4之后新加的注解，作用和原来的@ResponseBody配合@Controller相同。用于返回Json@PathVariable获取url中的参数@RequestParam获取请求参数的值@RequestMapping配置url映射，需要多个时可以将value写成一个集合@GetMapping组合注解，相当于@RequestMapping(method = RequestMethod.GET)@PostMapping组合注解，相当于@RequestMapping(method = RequestMethod.POST)

示例：

@PathVariable

获取url中所带的参数，如http://127.0.0.1:8081/girl/hello/say/12

@RequestMapping(value = "/say/{id}" ,method = RequestMethod.GET) public Integer say(@PathVariable("id") Integer id){ return id; }

@RequestParam

获取url后所带的请求参数，如http://127.0.0.1:8081/girl/hello/say?id=12

@RequestMapping(value = "/say" ,method = RequestMethod.GET) public Integer say(@RequestParam(value = "id",required = false,defaultValue ="1") Integer myId){ return myId; }

注：@RequestParam中‘required ’值表示时候可不传入，‘defaultValue ’值表示当不传入是的默认值，必须为String类型

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

等价于

@GetMapping(value = "/say")