1、創建一個登陸攔截器SecurityInterceptor，它繼承HandlerInterceptorAdapter類

package com.cn.commodity.config;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

 
public class SecurityInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        HttpSession session = request.getSession();
        if (session.getAttribute(WebSecurityConfig.SESSION_KEY) != null
 
) {
            return true;
        }

        // 跳轉登錄-------controller類中的登陸方法
        String url = "/login";
        response.sendRedirect(url);
        return false;
    }
}

2、創建一個URL攔截器WebSecurityConfig類，主要在這個類中實現URL攔截。註意：具體的攔截依據項目而定。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class WebSecurityConfig extends WebMvcConfigurerAdapter {

    public static final String SESSION_KEY = "user";

    @Bean
    public SecurityInterceptor getSecurityInterceptor() {
        return new SecurityInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration addInterceptor = registry.addInterceptor(getSecurityInterceptor());
        // 排除配置--對下面的不進行攔截
        addInterceptor.excludePathPatterns("/index");
        addInterceptor.excludePathPatterns("/login");
      //  addInterceptor.excludePathPatterns("/user/**");
        addInterceptor.excludePathPatterns("/start/**");
        // 攔截配置
        addInterceptor.addPathPatterns("/**");
    }
}

3、自己寫一個controller和一些jsp，就可以實現了。

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class JspController {
    @RequestMapping("/index")
    public String index(){
        return  "index";
    }

    @RequestMapping("/login")
    public String login(){
        return  "login";
    }
}

4、jsp目錄和配置圖

Springboot2.0實現URL攔截