轉自：https://blog.csdn.net/qq_26555463/article/details/78296103

如果是一個后臺的管理項目的,有些東西是不能直接就可以訪問的,必須要登錄才可以進去,所以就需要進行登錄攔截,只有登錄過的用戶才可以正常訪問.?
登錄攔截是不會攔截jsp頁面的方法,所以我們需要在Controller寫方法進行頁面的調用,而且需要把jsp頁面從webapp文件夾下放到WEB-INF下面,因為webapp下的文件是可以直接訪問到的:文件目錄?
,?
首先創建一個WebConfig.class文件,進行攔截器的創建,攔截器需要實現WebMvcConfigurerAdapter類,繼承ApplicationContextAware類,?
代碼如下:

package com;import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.annotation.Configuration; import org.springframework.util.ResourceUtils; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import com.interceptor.LoginInterceptor; @Configuration public class WebConfig extends WebMvcConfigurerAdapter implements ApplicationContextAware { private ApplicationContext applicationContext; public WebConfig(){ super(); } @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { System.out.println("1"); registry.addResourceHandler("/static/**").addResourceLocations(ResourceUtils.CLASSPATH_URL_PREFIX+"/static/"); registry.addResourceHandler("/templates/**").addResourceLocations(ResourceUtils.CLASSPATH_URL_PREFIX+"/templates/"); super.addResourceHandlers(registry); } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { System.out.println("11"); this.applicationContext = applicationContext; } @Override public void addInterceptors(InterceptorRegistry registry) { System.out.println("111"); //攔截規則：除了login，其他都攔截判斷 registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login","/user/gologin"); super.addInterceptors(registry); } }

上面的文件除了/user/login(登錄信息驗證方法),/user/gologin(返回登錄頁面方法)這兩個方法不攔截,別的都攔截判斷?

然后編寫自定義的驗證規則,判斷攔截到的請求是否通過

package com.interceptor;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class LoginInterceptor implements HandlerInterceptor { private static final Logger log = LoggerFactory.getLogger(LoginInterceptor.class); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // TODO Auto-generated method stub log.info("------preHandle------"); // 獲取session HttpSession session = request.getSession(true); // 判斷用戶ID是否存在，不存在就跳轉到登錄界面 if (session.getAttribute("userId") == null) { log.info("------:跳轉到login頁面！"); System.out.println(request.getContextPath() + "/login"); response.sendRedirect("/user/gologin"); return false; } else { return true; } } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // TODO Auto-generated method stub } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { // TODO Auto-generated method stub } }

?

當用戶登錄成功,將用戶的信息存到session中,之后的訪問,就會去session中判斷有沒有用戶信息,如果沒有用戶信息,則跳轉到登錄頁面,進行用戶登錄

轉載于:https://www.cnblogs.com/sharpest/p/8670711.html

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