Spring MVC--RequestMapping

1. Request narrowing

When accessing the equivalent of adding a layer of catalogs @RequestMapping comment on the class: project name / user / .......

1  // narrowing request 
2 @RequestMapping ( "User" )
 . 3  public  class UserControoler {}

 

2. parameter binding

1 @ResponseBody
2 @RequestMapping("/findById.action")   
3 public String findById(HttpServletRequest request,@RequestParam(name = "uid",required = true) Integer id){ // 必须要有参数uid
4   return "***";  
5 }

 

2.2 submission

1 @RequestMapping
　　(
　　　　path = "/queryAll.action",
　　　　method = {RequestMethod.POST,RequestMethod.GET}，
2      params = {"uid=1"}
3   )

 

 

3. controller returns the value the ModelandView method (most commonly used) String void 

. 1   public ModelAndView test1 () {// the most common and convenient 

2      　ModelAndView ModelAndView = new new ModelAndView ();
 . 3        modelAndView.addObject ( "MSG", "Hello" );
 . 4        modelAndView.setViewName ( "../ the index.jsp " );
 . 5     
. 6        return ModelAndView;
 . 7 }

. 1    public String test2 (the Model Model) { // Model data save request to a domain, the shared data forwarding, redirection, twice request, the data is not shared 
2 model.addAttribute ( "msg", "hello " );
 . 3     　　return " Forward: the index.jsp ../ " ;
 . 4     　　return " the redirect: the index.jsp ../ " 
. 5}  

1     public void test3(HttpServletRequest request, HttpServletResponse response){
2         request.setAttribute("msg","日月星辰");
3         request.getRequestDispatcher("../index.jsp").forward(request,response);
4     }

 

5. File Upload

springmvc.xml - must be resolved fileUpload component id: multipartResolver

  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

 

 

web.jsp

1     <form method="post" enctype="multipart/form-data" action="user/upload.action">
2         <input type="file" name="file">
3         <input type="submit" value="上传">
4     </form>

 

Controller Class @RequestMapping ( "user") // narrowing request

. 1      @RequestMapping ( "/ upload.action" )
 2      @ResponseBody
 . 3      public String Upload (a MultipartFile File) throws IOException {
 . 4          // file name 
. 5          String OriginalFilename = file.getOriginalFilename ();
 . 6          String UUID = UUID.randomUUID (). . toString () Replace ( "-", "" ); // do not overlap with the 32-bit characters
 . 7          int (. "I = originalFilename.lastIndexOf" );
 . 8          String suffix = originalFilename.substring (I);
 . 9  
10          // the page file name attribute value 
11          String name = file.getName();
12         System.out.println(originalFilename);
13         System.out.println(name);
14         File file1 = new File("E:\\upload\\"+uuid+suffix);
15         file.transferTo(file1);
16         return "上传中";
17     }