SpringMVC：JSON

@ResponseBody

params="json"：访问我这个方法的时候一定要有参数名为json

返回值User
jackson-all-1.9.0.jar

    @RequestMapping(value="/{nickname}",method=RequestMethod.GET,params="json")
    @ResponseBody
    public User show(@PathVariable String nickname){
        System.out.println(nickname);
        return users.get(nickname);
    }

http://localhost:7070/SSM/user/lisi?json