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1. @component
可以在实体类(pojo)上注释,等同于注入spring的bean对象
2.@PathVariable
url:localhost:8080/hello/666
@RequestMapping(value = "/hello/{id}" )
public String say(@PathVariable("id") String id){ return id; }
3.@RequstParam
url:localhost:8080/hello?id=666
@RequestMapping(value = "/hello" ) public String say(@RequestParam("id") String id){ return id; }