springboot-web开发

左手的ㄟ右手 2022-10-13 10:30 39阅读 0赞

### 文章目录 ###

*   *   *  抽取公共页面
         *  遍历数据
         *  拦截器
         *  文件上传
         *  原生servlet注入

### 抽取公共页面 ###

表单提交

IndexController

//去登录页
        @GetMapping(value = {
        "/","/login"})
        public String loginPage(){
        
            return "login";
        }
    
        @PostMapping("/login")
        public String main(User user, HttpSession session, Model model){
        
            if(StringUtils.hasLength(user.getUsername()) && "12345".equals(user.getPassword())){
        
                    session.setAttribute("loginUser",user);
                //登录成功重定向到main.html,防止表单重复提交
                return "redirect:/main.html";
            }else {
        
                model.addAttribute("msg","账号密码错误");
                return "login";
            }
        }
    
        /*
        跳转页面，
        去main页面
         */
        @GetMapping("/main.html")
        public  String mainPage(HttpSession session,Model model){
        
    
            Object loginUser = session.getAttribute("loginUser");
            if(loginUser != null){
        
                return "main";
            }else {
        
                model.addAttribute("msg","请重新登录");
                return "login";
            }
        }

登录时错误提示

显示登录用户

<a href="#" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                        <img src="images/photos/user-avatar.png" alt="" />
                        [[${
        session.loginUser.username}]]
                        <span class="caret"></span>
                    </a>

### 遍历数据 ###

@GetMapping("/dynamic_table")
        public String dynamic_table(Model model){
        
            List<User> users = Arrays.asList(new User("zhangsan","123435"),
                    new User("lisi","1234567"),
                    new User("wangwu","12345678"),
                    new User("jahui","93749237"));
    
            model.addAttribute("users",users);
    
            return "table/dynamic_table";
        }

<thead>
            <tr>
                <th>#</th>
                <th>用户名</th>
                <th>密码</th>
    
            </tr>
            </thead>
            <tbody>
                <tr class="gradeX" th:each="user,status:${users}">
                    <td th:text="${status.count}">aaa</td>
                    <td th:text="${user.username}">bbb</td>
                    <td>[[${user.password}]]</td>
                </tr>
    
    
            </tbody>
    
            </table>

### 拦截器 ###

@Configuration
    public class AdminWebConfig implements WebMvcConfigurer {
        
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
        
            registry.addInterceptor(new LoginInterceptor())
                    .addPathPatterns("/**")
                    .excludePathPatterns("/","/login","/css/**","/fonts/**","/img/**","/js/**");
    
        }
    }

/*
        目标方法执行之前
         */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        
            //登录检查
            HttpSession session = request.getSession();
    
            Object loginUser = session.getAttribute("loginUser");
    
            if(loginUser != null){
        
                return true;
            }
    
    //        session.setAttribute("msg","先登录");
    //        response.sendRedirect("/");
            request.setAttribute("msg","请先登录");
            request.getRequestDispatcher("/").forward(request,response);
    
            return false;
        }
    
    
    
        /*
        目标方法执行完成以后
         */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        
    
        }
    
        /*
        页面渲染之后
         */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        
    
        }

### 文件上传 ###

@Controller
    public class FormTestController {
        
    
        @GetMapping("/form_layouts")
        public String from_layouts() {
        
    
            return "form/form_layouts";
        }
    
        /**
         * 自动封装上传过来的文件
         * @param email
         * @param username
         * @param headerImg
         * @param photos
         * @return
         */
        @PostMapping("/upload")
        public String upload(@RequestParam("email") String email,
                             @RequestParam("username") String username,
                             @RequestParam("headerImg") MultipartFile headerImg,
                             @RequestPart("photos") MultipartFile[] photos) throws IOException {
        
            if(!headerImg.isEmpty()){
        
                String originalFilename = headerImg.getOriginalFilename();
                headerImg.transferTo(new File("D:\\abc\\"+originalFilename));
            }
            if(photos.length>0){
        
                for(MultipartFile photo:photos){
        
                    if(!photo.isEmpty()){
        
                        String originalFilename = photo.getOriginalFilename();
                        photo.transferTo(new File("D:\\abc\\"+originalFilename));
                    }
                }
            }
    
    
            return "main";
        }
    
    }

spring.servlet.multipart.max-file-size=10MB
    spring.servlet.multipart.max-request-size=100MB

### 原生servlet注入 ###

@WebServlet(urlPatterns = "/my")
    public class MyServlet extends HttpServlet {
        
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            resp.getWriter().write("66666");
        }
    }

@ServletComponentScan(basePackages = "com.atjh.boot05webadmin")
    @SpringBootApplication
    public class Boot05WebAdminApplication {
        
    
        public static void main(String[] args) {
        
            SpringApplication.run(Boot05WebAdminApplication.class, args);
        }
    
    }