SpringMVC @RequestMapping的几种形式

（一）：通过url传参型：

//本方法将处理 /courses/view?courseId=123 形式的URL
	@RequestMapping(value="/view", method=RequestMethod.GET)
	public String viewCourse(@RequestParam("courseId") Integer courseId, Model model) {
		Course course = courseService.getCoursebyId(courseId);
		log.debug("A courseView : courseId {}" + courseId);
		model.addAttribute(course);
		return "course_overview";
	}

 （二）：/courses/view2/123 :

//本方法将处理 /courses/view2/123 形式的URL
	@RequestMapping("/view/{courseId}")
	public String viewCourse2(@PathVariable("courseId") Integer courseId, Map<String, Object>model) {
		Course course = courseService.getCoursebyId(courseId);
		log.debug("A courseView2 : courseId  {}" + courseId);
		model.put("course", course);
		return "course_overview";
	}

（三） 直接用HttpServletrequest的形式：

//本方法将处理 /courses/view3?courseId=123 形式的URL
	@RequestMapping("view3")
	public String viewCourse3(HttpServletRequest request) {
		//获得参数
		Integer courseId = Integer.valueOf(request.getParameter("courseId"));
		//寻找课程
		Course course = courseService.getCoursebyId(courseId);
		//日志
		log.debug("A viewCourse : courseId " + courseId );
		//设置属性
		request.setAttribute("course", course);
		
		return "course_overview";
	}