Spring MVC--RequestMapping

1. 窄化请求

在类上用注解 @RequestMapping 相当于在加一层目录访问时：项目名/user/.......

1 //窄化请求
2 @RequestMapping("user")
3 public class UserControoler {}

2. 参数绑定

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 提交方式

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

3. controller方法返回值 ModelandView (最常用) String void

1  public ModelAndView test1(){ // 最常用，最方便
2     　ModelAndView modelAndView = new ModelAndView();
3       modelAndView.addObject("msg","你好");
4       modelAndView.setViewName("../index.jsp");
5    
6       return modelAndView;
7 }

1   public String test2(Model model){ //model将数据保存到了request域中了，所以转发数据共享，重定向时，是两次请求，数据不共享
2     　　model.addAttribute("msg","你好");
3     　　return "forward:../index.jsp";
4     　　return "redirect:../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. 文件上传

springmvc.xml -- 解析fileUpload组件 id 必须为：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") // 窄化请求

 1     @RequestMapping("/upload.action")
 2     @ResponseBody
 3     public String upload(MultipartFile file) throws IOException {
 4         //文件名
 5         String originalFilename = file.getOriginalFilename();
 6         String uuid = UUID.randomUUID().toString().replace("-", ""); // 32位字符用不重复
 7         int i = originalFilename.lastIndexOf(".");
 8         String suffix = originalFilename.substring(i);
 9 
10         //页面的file的name属性值
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     }

来源：https://www.cnblogs.com/xxing/p/11867322.html

标签

modelandview

string