SpringMVC四种controller接收参数的方式，三种controller向界面传递参数的方法

分享几种springmvc传递接收参数的方式

/**
	 * 接收参数1
	 * @param req
	 * @return
	 */
	@RequestMapping("/hello3")
	public String hello3(HttpServletRequest req) {
		String name = req.getParameter("name");
		String age = req.getParameter("age");
		System.out.println("name:"+name);
		System.out.println("age:"+age);
		return "hello";
	}
	/**
	 * 接收参数2
	 * @param name
	 * @param age
	 * @return
	 */
	@RequestMapping("/hello4")
	public String hello4(String name,String age) {
		System.out.println("name:"+name);
		System.out.println("age:"+age);
		return "hello";
	}
	/**
	 * 接收参数3(自动装箱)
	 * 成员变量的名字要与页面的参数名字对应
	 * @param user
	 * @return
	 */
	@RequestMapping("/hello5")
	public String hello5(User user) {
		System.out.println("name:"+user.getName());
		System.out.println("age:"+user.getAge());
		return "hello";
	}
	/**
	 * 接收参数4
	 * 利用@RequestParam("页面参数的名字") 自定义变量名
	 * @param user
	 * @return
	 */
	@RequestMapping("/hello6")
	public String hello6(@RequestParam("name") String username,@RequestParam("age") String userage) {
		System.out.println("name:"+username);
		System.out.println("age:"+userage);
		return "hello";
	}
	/**
	 * 传递参数1
	 * 利用ModelAndView对象，通过addobject方法传参
	 * @param user
	 * @return
	 */
	@RequestMapping("/hello7")
	public ModelAndView hello7(ModelAndView mv) {
		mv.setViewName("hello");
		mv.addObject("username", "laowang");
		mv.addObject("age", "50");
		return mv;
	}
	/**
	 * 传递参数2
	 * 利用声明map传参
	 * @param user
	 * @return
	 */
	@RequestMapping("/hello8")
	public String hello8(Map<String,Object> map) {
		map.put("username", "陈");
		map.put("age", "26");
		return "hello";
	}
	/**
	 * 传递参数3
	 * 利用声明model对象addAttribute方法进行传参
	 * @param user
	 * @return
	 */
	@RequestMapping(value="/hello9")
	public String hello9(Model model) {
		System.out.println("hello9");
		model.addAttribute("username", "二傻");
		model.addAttribute("age", "18");
		return "hello";
	}