springboot-web开发

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

<form class="form-signin" action="index.html" method="post" th:action="@{/login}">

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

<label style="color: red" th:text="${msg}"></label>

显示登录用户

<a href="#" class="btn btn-default dropdown-toggle" data-toggle="dropdown"><img src="data: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 {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/","/login","/css/**","/fonts/**","/img/**","/js/**");}
}

/*目标方法执行之前*/@Overridepublic 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*/@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}/*页面渲染之后*/@Overridepublic 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";}}

 <form role="form" th:action="@{/upload}" method="post" enctype="multipart/form-data"><div class="form-group"><label for="exampleInputEmail1">邮箱</label><input type="email" name="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email"></div><div class="form-group"><label for="exampleInputPassword1">名字</label><input type="password" name="username" class="form-control" id="exampleInputPassword1" placeholder="Password"></div><div class="form-group"><label for="exampleInputFile">头像</label><input type="file" name="headerImg" id="exampleInputFile"></div><div class="form-group"><label for="exampleInputFile">生活照</label><input type="file" name="photos" multiple></div><div class="checkbox"><label><input type="checkbox"> 检查</label></div><button type="submit" class="btn btn-primary">提交</button></form>

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 {@Overrideprotected 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);}}

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springboot-web开发

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

springboot-web开发相关推荐

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