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("/**");
    }
}