处理方法返回值

@RequestMapping("/first")
    @ResponseBody
    public Object doOne(){
    return 1;
    }
    @RequestMapping(value = "/second",produces = "text/html;charset=utf-8")
    @ResponseBody
    public Object sss(){
        return "黑夜";
    }

    @RequestMapping(value = "/three")
    @ResponseBody
    public Object ssss(){
        UserInfo info=new UserInfo();
        info.setName("aaaa");
        return info;
    }

@RequestMapping(value = "/four")
    @ResponseBody
    public Object s2(){
        Map<String,UserInfo> map=new HashMap<String, UserInfo>();
        UserInfo info=new UserInfo();
        info.setName("aaaa");
        info.setAge(12);
        UserInfo info1=new UserInfo();
        info1.setName("aaaaa");
        info1.setAge(122);
        map.put(info.getName(),info);
        map.put(info1.getName(),info1);
        return map;
    }

@RequestMapping(value = "/five")
    @ResponseBody
    public Object dofive(){
        List<UserInfo> list=new ArrayList<UserInfo>();
        UserInfo info=new UserInfo();
        info.setName("aaaa");
        info.setAge(12);
        list.add(info);
        return list;
    }