@RequestMapping("/aaa")//类级别,可以不需要,如果要了,下面所有的请求路径前都需要加入/aaa   public class DefaultController{    @RequestMapping("/bbb")//方法级别,必须有,决定这个方法处理哪个请求,如果有类级别 /aaa/bbbpublic String xxx()    {    //如果没有类级别的就直接请求/bbb   return;    }
}

@RequestMapping(value="user/{id}/{name}",method=RequestMethod.GET)public String printMessage1(@PathVariable String id,@PathVariable String name, ModelMap model) {System.out.println(id);System.out.println(name);model.addAttribute("message", "111111");return "users";}

@RequestMapping("/somepath/{userName}")
public String register(@PathVariable(value = "userName") String userName) {
ModelAndView mav = new ModelAndView();
return "user/createSuccess";
}在springmvc注解的@RequestMapping("/somepath/{userName}")如何处理默认值的情况,比如我在发送请求的时候,userName有时候是没有的，所以导到了不能匹配这个action
http://localhost:8080/spc/movie/somepath/就不能匹配上面的请求:
http://localhost:8080/spc/movie/somepath/tom而这个才可以匹配。
@PathVariable 会将url中的参数解析到对应的方法参数上，需要在@RequestMapping()指定匹配模式
@RequestMapping("somepath/{userName}")
这时你访问地址"somepath/Tom"就能把"Tom"解析到方法参数userName上

@RequestMapping("/user")或@RequestMapping(value="/user")  对路径进行映射
@RequestMapping(params="user")  对参数进行映射
@RequestParam(value="user") 对参数进行映射 

@RequestMapping(value = "/user", method = RequestMethod.GET)
public String setupForm(@RequestParam("name") String name, ModelMap model) { System.out.println(name);
return "helloWorld";
}

请求方法映射或 的关系：method={RequestMethod.POST, RequestMethod.GET};如果需要支持OPTIONS、TRACE，请添加DispatcherServlet在web.xml的初始化参数：dispatchOptionsRequest 和 dispatchTraceRequest 为true。请求参数映射@RequestMapping(params="create") 有create参数@RequestMapping(params!="create") 没有create参数@RequestMapping(params="create=sfp") create=sfp@RequestMapping(params="create!=sfp") create!=sfp且 的关系 @RequestMapping(params={"test1", "test2=create"})

<form method="post" action="user">a: <input id="a" type="text"   name="a"/>b: <input id="b" type="text"   name="b"/><input type="submit" value="Submit" /></form>

public class Pojo{private String a;private int b;}

@RequestMapping(value = "/user",method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) {  return "helloWorld";
}

@RequestMapping(value = "/user",method = RequestMethod.GET)
public String get(HttpServletRequest request, HttpServletResponse response) { System.out.println(request.getParameter("name")); return "helloWorld";
}