WebMvcConfigurer

1.概述

WebMvcConfigurer配置类其实是Spring内部的一种配置方式，采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制，可以自定义一些Handler，Interceptor，ViewResolver，MessageConverter。基于java-based方式的spring mvc配置，需要创建一个配置类并实现**WebMvcConfigurer** 接口；

在Spring Boot 1.5版本都是靠重写WebMvcConfigurerAdapter的方法来添加自定义拦截器，消息转换器等。SpringBoot 2.0 后，该类被标记为@Deprecated（弃用）。官方推荐直接实现WebMvcConfigurer或者直接继承WebMvcConfigurationSupport，方式一实现WebMvcConfigurer接口（推荐），方式二继承WebMvcConfigurationSupport类

视图解析器

实现：

1.实现WebMvcConfigurer接口

2.重写configureViewResolvers 该方法是用来配置视图解析器的该方法有一个参数ViewResolverRegistry是一个注册器用来注册你想定义的视图解析器

	 * Configure view resolvers to translate String-based view names returned from

	 * controllers into concrete {@link org.springframework.web.servlet.View}

	 * implementations to perform rendering with.

	default void configureViewResolvers(ViewResolverRegistry registry) {

3.添加@EnableWebMvc 开启个性化定制

4.覆盖configurerViewResolvers

@ComponentScan(basePackages="com.czxy.mvc.controller")

public class MvcConfiguration implements WebMvcConfigurer {

    public void configureViewResolvers(ViewResolverRegistry registry) {

        registry.jsp("/pages/",".jsp");

异常处理器

异常处理器的实现方式有两种

第一种：实现类编写实现类实现HandlerExceptionResolver接口

第二种：增强类

使用@ControllerAdvice对Controller进行增强

使用ExceptionHandler用于捕获控制器里面的异常并进行处理？

方式一：实现HandlerExceptionResolver接口

public class CustomExceptionResolver  implements HandlerExceptionResolver {

    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {

        CustomExcption customExcption = null;

        if(e instanceof CustomExcption) {

            customExcption = (CustomExcption) e;

            customExcption = new CustomExcption("系统繁忙，请稍后重试！");

        ModelAndView modelAndView = new ModelAndView();

        modelAndView.addObject("message" ,customExcption.getMessage());

        modelAndView.setViewName("forward:/error.jsp");

        return modelAndView;

方式二：通知类

@CotrollerAdvice 全局异常处理

@ExceptionHandler 用来统一处理方法异常

public class GlobalExceptionResolver {

    @ExceptionHandler(CustomExcption.class)

    public String custom(CustomExcption ec, Model model) {

        model.addAttribute("message", ec.getMessage() + "Global");

        return "forward:/error.jsp";

    @ExceptionHandler(Exception.class)

    public String other(Exception e, Model model) {

        model.addAttribute("message", "系统繁忙，请稍后重试！" + "Global");

        return "forward:/error.jsp";

拦截器

preHandler：拦截器之前执行返回true继续执行返回false结束

postHandler：执行完Controller之后执行

afterCompletion：视图渲染完成之后完成

拦截器：

public class MyInterceptor implements HandlerInterceptor {

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        System.out.println("1 拦截前");

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

        System.out.println("3 执行中");

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

        System.out.println("5 最后完成");

实现WebMvcConfigurer接口重写addInterceptor方法设置拦截路径

@Configuration      //配置类

@ComponentScan(basePackages = {"com.czxy.inter.controller","com.czxy.inter.interceptor"})

public class SpringMVCConfig implements WebMvcConfigurer {

    private MyInterceptor myInterceptor;

    public void addInterceptors(InterceptorRegistry registry) {

        InterceptorRegistration interceptorRegistration1 = registry.addInterceptor(myInterceptor);

        interceptorRegistration1.addPathPatterns("/**");

本文使用文章同步助手同步

SpringMVC 最新 WebMvcConfigurer 视图解析器 异常处理器 拦截器

WebMvcConfigurer

视图解析器

异常处理器

拦截器

SpringMVC 最新 WebMvcConfigurer 视图解析器异常处理器拦截器