Spring MVC ???????????

??????????

Spring MVC???????????????HTTP???????????????????????????????????????????????????????????

@RequestParam????????????????????
- value???????????
- required???????????????? true?
- defaultValue???????????????????

@RequestHeader???????????????????????????????????????????????

??@RequestParam????

??????? @RequestParam ????

@RequestMapping(value="/testRequestParam")public String testRequestParam(    @RequestParam(value="username") String username,    @RequestParam(value="age", required=false, defaultValue="0") int age) {    System.out.println("testRequestParam - username=" + username + ", age=" + age);    return "success";}

?????

testRequestParam

??@RequestHeader??

@RequestHeader ??????????????????????

@RequestMapping(value="/testRequestHeader")public String testRequestHeader(    @RequestHeader(value="Accept-Language") String acceptLanguage) {    System.out.println("testRequestHeader - Accept-Language: " + acceptLanguage);    return "success";}

?????

testRequestHeader

??@CookieValue??

@CookieValue ?????????? Cookie ??????????

@RequestMapping("/testCookieValue")public String testCookieValue(    @CookieValue("JSESSIONID") String sessionId) {    System.out.println("testCookieValue: sessionId: " + sessionId);    return "success";}

?????

testCookieValue

????POJO????

Spring MVC???POJO???????????????????????POJO??????????????????

@RequestMapping("/testPojo")public String testPojo(User user) {    System.out.println("testPojo: " + user);    return "success";}

????????

Spring MVC ??????????????????

1. ModelAndView

ModelAndView ???????????????????????? ModelAndView ????????????????

@RequestMapping("/handle04")public ModelAndView handle04() {    ModelAndView mv = new ModelAndView();    mv.setViewName("success0");    mv.addObject("msg", "???");    return mv;}

?????

handle04

2. Map ? Model

???????????? Map ? Model ????????????????????

@RequestMapping("/testMap")public String testMap(Map
   
     map) {    map.put("names", Arrays.asList("Tom", "Jerry", "Kite"));    return "success";}

?????

testMap

3. SessionAttributes ??

@SessionAttributes ???????????? HttpSession ?????????????

@Controller@SessionAttributes("user")public class SpringMVCController {    @RequestMapping("/testSessionAttributes")    public String testSessionAttributes(Map
   
     map) {        User user = new User("Tom", "123", "tom@atguigu.com", 22);        map.put("user", user);        map.put("school", "atguigu");        return "success";    }}

?????

testSessionAttributes

????

?????????????????Spring MVC ??????????????????????? @RequestParam?@RequestHeader?@CookieValue ????POJO?ModelAndView?Map?SessionAttributes?Spring MVC ????????????

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