使用拦截器做登录

定义controller

@RestController
public class TestController {
    @RequestMapping("/login")
    public String login(HttpSession session,String name,String password){
        System.out.println(name);
        System.out.println(password);
        // 这个需要查数据库判断用户名和密码是否正确
        if(Objects.equals(name, "xx") && Objects.equals(password, "xx"))
        {
            // 成功服务器记录sessionid，并设置生存时间，可以自行设置删除策略
            LoginInterceptor.MAP.put(session.getId(),16);
            return "成功";
        }
        return "失败";

    }
    @RequestMapping("/index")
    public String index(){
        return "登录";
    }
    @RequestMapping("/hello")
    public String helloWorld(){
        return "hello world";
    }
    @RequestMapping("/hello02")
    public String helloWorld02(){
        return "hello world 02";
    }
}

编写拦截的具体逻辑

已经登录，可以继续执行

package com.example.dockerredisqueue.Interceptor;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;

public class LoginInterceptor implements HandlerInterceptor {
    // 这里我们也可以放在redis
    public static final HashMap<String, Integer> MAP = new HashMap<>();
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 如果我们的map有浏览器存过来的sessionid我们就任务他是已经登录了。
        if(MAP.containsKey(request.getRequestedSessionId())) {
            return true;
        }
        // 失败我们跳转新的页面
        request.setAttribute("msg","登录出错");
        request.getRemoteHost();
        request.getRequestDispatcher("/index").forward(request,response);
        return false;
    }
}

配置拦截器的作用域

package com.example.dockerredisqueue.Interceptor;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.handler.MappedInterceptor;

@Configuration
public class InterceptorConfig {
    @Bean
    public MappedInterceptor loginInterceptor(){
        // 设置拦截器的作用域
        return new MappedInterceptor(new String[]{"/**"},new String[]{"/login","/index"},new LoginInterceptor());
    }
}