SpringMvc

Model、ModelMap、@ModelAttribute

@ModelAttribute ：被该注解修饰的方法，会在每一次请求时优先执行，用于接收前台jsp页面传入的参数

  1. 优先级：ModelAndView  > Model/ModelMap(按书写顺序) > request.setAttribute
  3. @RequestMapping("/test5")
  4. public String test5(Model mm ,ModelMap mmp,HttpServletRequest request){
  5.     request.setAttribute("key1", "123456");
  6.     mm.addAttribute("key1", "12345");
  7.     mmp.addAttribute("key1", "1234567");
  8.     return "mytest";
  9. }//前端为 1234567 1234567

@ModelAttribute

spring学习之@ModelAttribute运用详解
例如从表单获取：

  1. // task-list.jsp、task-page.jsp
  2. <input type="hidden" name="account" value='${param["account"]}'/>
  3. <input type="text" name="pageNo" id="pageNo">
// TaskController
public String load(@PathVariable String type, HttpServletRequest request, ModelMap modelMap,
                        @ModelAttribute TaskSetting taskSetting) {
    taskSetting.getAccount();
    taskSetting.getPageNo();
}

@RequestAttribute、@SessionAttribute

从原理层面掌握@RequestAttribute、@SessionAttribute的使用

@RequestAttribute作为参数获取，或HttpServletRequest::getAttribute

 @GetMapping("/success")
public void success(@RequestAttribute String msg, @RequestAttribute Integer code, HttpServletRequest request) {
    request.getAttribute("msg");
}

WebMvcConfigurer