spring mvc获取header

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") String userAgent)
 
        //..
    }
}