springMVC第一天

 来看几个例子 , 秒懂 , 很简单

//http://localhost/param5?username=zhangsan&age=18
    @GetMapping("/param5")
    public String param5(@RequestParam Map<String,String> map){
        map.forEach((k,v)->{
            System.out.println(k+"==>"+v);
        });
        return "/index.jsp";
    }


    //http://localhost/param4?hobby=zq&hobby=pq&hobby=tq
    @GetMapping("/param4")
    public String param4(@RequestParam List<String> hobby){
        for (String s : hobby) {
            System.out.println(s);
        }
        return "/index.jsp";
    }


    //http://localhost/param3?hobby=zq&hobby=pq&hobby=tq
    @GetMapping("/param3")
    public String param3(String[] hobby){
        for (String s : hobby) {
            System.out.println(s);
        }
        return "/index.jsp";
    }


    //http://localhost/param2?username=zhangsan&age=18
    @GetMapping("/param2")
    public String param2(@RequestParam(value="username",required = false,defaultValue = "haohao") String name, Integer age){
        System.out.println(name+"===="+age);
        return "/index.jsp";
    }

    //http://localhost/param1?username=zhangsan&age=18
    @RequestMapping("/param1")
    public String param1(String username,int age){
        System.out.println(username+"===="+age);
        return "/index.jsp";
    }

来看第二种方式

 用一个user类封装信息 , 很方便 ,(SpringMVC容器已经帮我们把User对象创建了)

    //http://localhost/param6?username=zhangsan&age=18&hobbies=zq&hobbies=pq&birthday=2018/11/11&address.city=tj&address.area=bh
    @GetMapping("/param6")
    public String param6(User user){
        System.out.println(user);
        return "/index.jsp";
    }