java之拦截器Interceptor/自定义视图解析器

拦截器，return true 是放行

package com.jay.interceptors;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {
        //拦截前
        String url = request.getRequestURL().toString();
        if (url.contains("login")) {
            return true;
        }
        HttpSession session = request.getSession();
        String name = (String) session.getAttribute("username");
        System.out.println(name);
        if (name != null) {
            return true;
        } else {
            request.getRequestDispatcher("/login").forward(request, response);
        }
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //拦截后
    }

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

在Spring xml中配置拦截器 /** 是拦截所有请求

<!--拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <bean class="com.jay.interceptors.LoginInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

 在SpringBoot中配置拦截器，在自定义解析器中

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**")
                .excludePathPatterns("/index","/login","/css/**","/js/**","/img/**");
    }

 视图解析器

package com.jay.SpringBootStudy8.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        //设置视图请求地址，相当于 @RequestMapping("/a")
//        registry.addViewController("/a").setViewName("views/sysuser/index");
//        registry.addViewController("/index.html").setViewName("index");
    }
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
//        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**")
//                .excludePathPatterns("/index","/login","/css/**","/js/**","/img/**");
    }
}