SpringBoot2----拦截器和文件上传功能

  registry.addInterceptor(new LoginHanlderIntercept()).
            //拦截任意多层路径下的所有请求,某些请求不进行拦截
            addPathPatterns("/**").excludePathPatterns("/","/login")
            //将静态资源文件夹的资源放行
    .excludePathPatterns("/css/**","/fonts/**","/images/**","/js/**");

public class LoginHanlderIntercept implements HandlerInterceptor
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user=request.getSession().getAttribute("loginUser");
        if(user==null)
        {
            //未登陆,返回登陆页面
            request.setAttribute("msg","没有权限请先登陆");
            //转发到登录页
            request.getRequestDispatcher("/").forward(request,response);
            //重定向到登录页,但是这样是两次请求,那么登录页面就无法获取到request域中的值
            //response.sendRedirect("/");
            return false;
        }
        else
        {
            //已登陆，放行请求
            return true;
        }
    }

   @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}

@Controller
public class IndexController
{
    //get方式的请求，来到登录页面
    @GetMapping({"/","/login"})
    public String ToLoginPage()
    {
        //到达登录页面
        return "login";
    }

    //post方式的请求来到主页面
    @PostMapping("/login")
    public String main(User user, HttpSession session, Model model)
    {
        //如果用户名和密码不为空，就放到session域中保存起来
        if(!StringUtils.isEmpty(user.getUsername())&&!StringUtils.isEmpty(user.getPassword()))
        {
            //登录成功后，将登录用户的信息放入到session域中
            session.setAttribute("loginUser",user);
            //防止表单重复提交建议使用重定向
            //登录成功重定向到main.html
            return "redirect:main.html";
        }
        else
        {
            model.addAttribute("msg","账号密码错误");
            //回到主页
            return "login";
        }
    }

    //去main页面
    @GetMapping("/main.html")
    public String mainPage()
    {
        return "main";
    }
}

@Configuration
public class WebConfig implements WebMvcConfigurer
{

    @Override
    public void addInterceptors(InterceptorRegistry registry)
    {
    registry.addInterceptor(new LoginHanlderIntercept()).
            //拦截任意多层路径下的所有请求,某些请求不进行拦截
            addPathPatterns("/**").excludePathPatterns("/","/login")
            //将静态资源文件夹的资源放行
    .excludePathPatterns("/css/**","/fonts/**","/images/**","/js/**");
    }
}

   //MultipartFile---自动封装上传过来的文件
    @PostMapping("/upload")
    public String upload(@RequestParam("name")String name,
                          //单个文件上传
                          @RequestPart("hs") MultipartFile headImage,
                         //多文件上传--数组形式
                         @RequestPart("ls")MultipartFile[] photos) throws IOException {
        //日志调试,{}是占位符，{}有几个，后面对应跟着的参数就需要有几个
        log.info("上传的信息: username={},headImage={},photos={}",
                name,headImage.getSize(),photos.length);
        //下面展示将上传的文件，保存到电脑的对应磁盘路径
        //上传的文件不为空，才保存到磁盘中
        if(!headImage.isEmpty()){
            //下面是获取上传文件的原始文件名
            String originalFilename = headImage.getOriginalFilename();
            headImage.transferTo(new File("D:\\resource\\"+originalFilename));
        }
         //多文件上传，如果文件数组不为空，才进行保存操作
        if(photos.length > 0){
            for (MultipartFile photo : photos) {
                if(!photo.isEmpty()){
                    String originalFilename = photo.getOriginalFilename();
                    photo.transferTo(new File("D:\\resource\\"+originalFilename));
                }
            }
        }
        return "main";
    }

                        <form role="form" th:action="@{/upload}" method="post" enctype="multipart/form-data">
                          ...
                            <div class="form-group">
                                <label for="exampleInputFile">头像</label>
                                <input type="file" name="hs" id="exampleInputFile">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputFile">生活照片</label>
                                <!--这里multiple表示是多文件上传，可以选择多个文件同时上传-->
                                <input type="file" name="ls" id="photos" multiple>
                            </div>
                            ...
                        </form>

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