spring boot拦截器配置

1.在spring boot配置文件application.properties中添加要拦截的链接

com.url.interceptor=/user/test

2.编写拦截器代码 ，创建UrlInterceptorUtil 类

 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.support.PropertiesLoaderUtils;
 import org.springframework.stereotype.Component;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import java.util.Properties;

 @Component
 public class UrlInterceptorUtil extends HandlerInterceptorAdapter {

     private String noCheckUrls;
     private static Properties props ;

     @Override
     public boolean preHandle(HttpServletRequest request,
                              HttpServletResponse response, Object handler) throws Exception {
         String url=request.getRequestURI();
         Resource resource = new ClassPathResource("/application.properties");//
         props = PropertiesLoaderUtils.loadProperties(resource);
         noCheckUrls=props.getProperty("com.url.interceptor","");
         if(!noCheckUrls.contains(url)){
                 return true;
         }
         HttpSession session=request.getSession();
 　　　　　//业务逻辑处理
         if (session.getAttribute("User")==null){

             response.sendRedirect("/index");
             return false;
         }
         return true;
     }

         @Override
         public void postHandle(HttpServletRequest request,
                                HttpServletResponse response, Object o, ModelAndView mav)
             throws Exception {
 //        System.out.println("postHandle");
     }

     @Override
     public void afterCompletion(HttpServletRequest request,
                                 HttpServletResponse response, Object o, Exception excptn)
             throws Exception {
 //        System.out.println("afterCompletion");
     }
 }

3.配置spring boot拦截

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
//标注此文件为一个配置项，spring boot才会扫描到该配置。该注解类似于之前使用xml进行配置
@Configuration
public class CustomWebMvcConfigurerAdapter extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //对所有的请求进行拦截
        registry.addInterceptor(new UrlInterceptorUtil()).addPathPatterns("/**");
    }
}