springBoot Web开发

public void addResourceHandlers(ResourceHandlerRegistry registry) {
    if (!this.resourceProperties.isAddMappings()) {
        logger.debug("Default resource handling disabled");
    } else {
        Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
        CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
        if (!registry.hasMappingForPattern("/webjars/**")) {
            this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }

        String staticPathPattern = this.mvcProperties.getStaticPathPattern();
        if (!registry.hasMappingForPattern(staticPathPattern)) {
            this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }

    }
}

public String getStaticPathPattern() {
    return this.staticPathPattern;
}

private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};

if (!this.resourceProperties.isAddMappings()) {
        logger.debug("Default resource handling disabled");
    } 

@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
    WelcomePageHandlerMapping welcomePageHandlerMapping = new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext), applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());
    welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));
    welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations());
    return welcomePageHandlerMapping;
}

private Optional<Resource> getWelcomePage() {
    String[] locations = WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations());
    return Arrays.stream(locations).map(this::getIndexHtml).filter(this::isReadable).findFirst();
}

private Resource getIndexHtml(String location) {
    return this.resourceLoader.getResource(location + "index.html");
}

this.mvcProperties.getStaticPathPattern()
getResource(location + "index.html")

public static final String DEFAULT_PREFIX = "classpath:/templates/";
public static final String DEFAULT_SUFFIX = ".html";

@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty(
    prefix = "spring.mvc",
    name = {"locale"}
)
public LocaleResolver localeResolver() {
    if (this.mvcProperties.getLocaleResolver() == org.springframework.boot.autoconfigure.web.servlet.WebMvcProperties.LocaleResolver.FIXED) {
        return new FixedLocaleResolver(this.mvcProperties.getLocale());
    } else {
        AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
        localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
        return localeResolver;
    }
}

public class MyLocaleResolver implements LocaleResolver {
    //解析请求
    @Override
    public Locale resolveLocale(HttpServletRequest httpServletRequest) {
        //获取请求中的请求参数
        String language = httpServletRequest.getParameter("l");
        //如果没有就使用默认的
        Locale locale = Locale.getDefault();
        //如果请求的连接携带了地区参数
        if(!StringUtils.isEmpty(language)){
            String[] split = language.split("_");
            //国家，对象
            locale = new Locale(split[0],split[1]);
        }
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Locale locale) {

    }
}

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {

    //注入自定义国际化组件
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    //登陆拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**")
             .excludePathPatterns("/index.html","/","/user/login","/css/**","/js/**","/img/**");
    }
}

public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //登陆成功之后，应该有用户的session
        Object loginUser = request.getSession().getAttribute("loginUser");

        if(loginUser == null){//没有登陆
            request.setAttribute("msg", "没有权限，请先登录");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        }else {
            return true;
        }

    }
}

@Controller
public class LoginController {

    @RequestMapping("/user/login")
    public String login(@RequestParam("username")String username,
                        @RequestParam("password")String password,
                        Model model, HttpSession session){
        if(!StringUtils.isEmpty(username) && "123456".equals(password)){
            session.setAttribute("loginUser", username);
            return "redirect:/main.html";
        }else {
            model.addAttribute("msg","用户名或密码错误！");
            return "index";
        }

    }
}

@PostMapping("/emp")
public String addEmp(Employee employee){
    employeeDao.save(employee);
    return "redirect:/emps";
}