两种方法：

1.在方法参数中加入@RequestHeader

2.在类级别注入HttpServletRequest

建议使用第二种方法，这样可避免每个方法都加入HttpHeaders参数

@Controller
@RequestMapping("/hello")
public class HelloController {
     @Autowired
     private HttpServletRequest request;

     @RequestMapping(value="/printname/{name}", method=RequestMethod.GET)
     public String printName(@PathVariable String name,
              @RequestHeader HttpHeaders headers) {
          System.out.println("from request:" + request.getHeader("code"));
          System.out.println("from parameter:" + headers.getFirst("code"));

          return "hello";
     }
}

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
//..

@Controller
public class HelloController {

    @RequestMapping(value = "/hello.htm")
    public String hello(@RequestHeader(value="User-Agent", defaultValue = "0") String userAgent)

        //..
    }
}