SpringMVC基本配置

港控/mmm° 2022-06-13 07:57 314阅读 0赞

1静态资源映射：

@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //addResourceLocations指的是文件放置的目录，addResourceHandler指的是对外暴露的访问路径
        registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/assets/");
    }

2拦截器配置：

定义拦截器：

public class DemoInterceptor extends HandlerInterceptorAdapter {
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            long startTime=System.currentTimeMillis();
            request.setAttribute("startTime",startTime);
            return true;
        }
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            long startTime=(Long) request.getAttribute("startTime");
            request.removeAttribute("startTime");
            long endTime=System.currentTimeMillis();
            System.out.println("本次请求处理时间为："+new Long(endTime-startTime)+"ms");
            request.setAttribute("handlingTime",endTime-startTime);
        }
    }

//匹配某些路径
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(demoInterceptor()).addPathPatterns("/**")
                .excludePathPatterns(
                        "/anno/*");
    }

3@ControllerAdvice的使用（具体用法看注解）：

/**组合了Component注解 * 将对控制器的全局配置放置在同一个位置 * 注解了该注解的类可以使用@ExceptionHandler,@InitBinder,@ModelAttribute注解到方法上 * 着对所有注解了@RequestMapping的控制器内的方法有效 */ @ControllerAdvice
    public class ExceptionHandlerAdvice {
        /** * 该注解用于全局处理控制器里的异常 * @param exception * @param request * @return */ @ExceptionHandler(value = Exception.class)
        public ModelAndView exception(Exception exception, WebRequest request){
            ModelAndView modelAndView=new ModelAndView("error");
            modelAndView.addObject("errorMessage",exception.getMessage());
            return modelAndView;
        }
        //可以让全局的@RequestMapping都能获取到此处设置的键值对
        @ModelAttribute
        public void addAttributes(Model model){
            model.addAttribute("msg","额外信息");
        }
    
        /** * 该注解用来设置WebDataBinder,WebDataBinder用来自动绑定前台请求参数到Model中,该方法会忽略request参数的id * @param webDataBinder */ @InitBinder
        public void initBinder(WebDataBinder webDataBinder){
            webDataBinder.setDisallowedFields("id");
        }
    }

测试例子：

@Controller
    public class AdviceController {
        @RequestMapping("/advice")
        public String getSomething(@ModelAttribute("msg") String msg,DemoObj obj){
            throw new IllegalArgumentException("非常抱歉，参数有误/"+"来自@ModelAttribute:"+msg);
        }
    }

4快捷的ViewController:

如果页面跳转无业务逻辑，只是简单的页面转向，可以通过重写addViewControllers来简化配置

@Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/index").setViewName("index");
    }