代码展示

建立实体类

UserBean

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import io.swagger.annotations.ApiModel;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

/**
 * @Author: Ljh
 * @Date: 2021/5/11 16:20
 */

@Data
@Accessors(chain = true)
@EqualsAndHashCode(callSuper = false)
@AllArgsConstructor
@NoArgsConstructor
@TableName("tab_member")
@ApiModel(value="用户", description="注册时产生的基本账户")
public class UserBean {
    @TableId(type = IdType.AUTO)
    private Integer memberId;
    private Integer memberAccountNumber;
    private String memberPassword;
    private String memberPhone;
}

RespBean

/**
 * @Author: Ljx
 * @Date: 2021/5/13 21:58
 */
public class RespBean {
    private Integer status;
    private String msg;
    private Object obj;

    public static RespBean build() {
        return new RespBean();
    }

    public static RespBean ok(Object obj) {
        return new RespBean(200, null, null);
    }

    public static RespBean ok(String msg) {
        return new RespBean(200, msg, null);
    }

    public static RespBean ok(String msg, Object obj) {
        return new RespBean(200, msg, obj);
    }

    public static  RespBean error(Object obj){
        return new RespBean(500,null,obj);
    }

    public static RespBean error(String msg) {
        return new RespBean(500, msg, null);
    }

    public static RespBean error(String msg, Object obj) {
        return new RespBean(500, msg, obj);
    }

    private RespBean() {
    }

    private RespBean(Integer status, String msg, Object obj) {
        this.status = status;
        this.msg = msg;
        this.obj = obj;
    }

    public Integer getStatus() {
        return status;
    }

    public RespBean setStatus(Integer status) {
        this.status = status;
        return this;
    }

    public String getMsg() {
        return msg;
    }

    public RespBean setMsg(String msg) {
        this.msg = msg;
        return this;
    }

    public Object getObj() {
        return obj;
    }

    public RespBean setObj(Object obj) {
        this.obj = obj;
        return this;
    }
}

建立持久层

ListenerMapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;
import studio.banner.forumwebsite.bean.UserBean;

/**
 * @Author: Ljx
 * @Date: 2021/5/14 21:05
 */
@Repository
public interface ListenerMapper extends BaseMapper<UserBean> {
}

建立服务层接口

IListenerService

import java.util.List;

/**
 * @Author: Ljx
 * @Date: 2021/5/14 21:00
 */
public interface IListenerService {
    /**
     * 查询所有用户
     * @return
     */
    List<UserBean> selectAllUser();
}

建立服务层实现

ListenerServiceImpl

import java.util.List;

/**
 * @Author: Ljx
 * @Date: 2021/5/14 21:09
 */
@Service
public class ListenerServiceImpl implements IListenerService {
    @Autowired
    private ListenerMapper listenerMapper;
    @Override
    public List<UserBean> selectAllUser() {
        List<UserBean> list = listenerMapper.selectList(null);
        return list;
    }
}

建立控制层

ListenerController

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import studio.banner.forumwebsite.bean.RespBean;
import studio.banner.forumwebsite.bean.UserBean;
import studio.banner.forumwebsite.config.MyHttpSessionListener;
import studio.banner.forumwebsite.service.impl.ListenerServiceImpl;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * @Author: Ljx
 * @Date: 2021/5/13 22:02
 */
@RestController
@Api(tags = "统计在线人数", value = "CollectController")
public class ListenerController {
    private static final Logger logger = LoggerFactory.getLogger(ListenerController.class);
    /**
     * 登录
     */
    @Autowired
    private ListenerServiceImpl listenerService;
    @ApiOperation(value = "用户登录", notes = "用户对象不能为空", httpMethod = "POST")
    @PostMapping("/login")
    public RespBean getUser(Integer username, String password, HttpSession session) {
        session.setMaxInactiveInterval(60*30);
        for (UserBean user: listenerService.selectAllUser()) {
            if (username.equals(user.getMemberAccountNumber()) && password.equals(user.getMemberPassword())){
                logger.info("用户【"+username+"】登陆开始！");
                session.setAttribute("loginName",username);
                logger.info("用户【"+username+"】登陆成功！");
                return RespBean.ok("用户【"+username+"】登陆成功！");
            }
        }
        logger.info("用户【"+username+"】登录失败！");
        return RespBean.error("用户【"+username+"】登录失败！");
    }
    /**
     *查询在线人数
     */
    @ApiOperation(value = "查询在线人数", httpMethod = "GET")
    @GetMapping("/online")
    public RespBean online() {
        return  RespBean.ok("当前在线人数：" + MyHttpSessionListener.online + "人");
    }
    /**
     * 退出登录
     */
    @ApiOperation(value = "退出登录", httpMethod = "GET")
    @GetMapping ("/logout")
    public RespBean logout(HttpServletRequest request) {
        logger.info("用户退出登录开始！");
        HttpSession session = request.getSession(false);
        if(session != null){
            session.removeAttribute("loginName");
            session.invalidate();
        }
        logger.info("用户退出登录结束！");
        return RespBean.ok("退出成功");
    }
    /**
     * 判断session是否有效
     * @param httpServletRequest
     * @return String
     */
    @ApiOperation(value = "判断session是否有效",httpMethod = "GET")
    @GetMapping("/getSession")
    public RespBean getSession(HttpServletRequest httpServletRequest) {
        HttpSession session = httpServletRequest.getSession();
        Integer loginName = (Integer) session.getAttribute("loginName");
        if (loginName != null) {
            return RespBean.ok("session有效");
        }
        return null;
    }
}

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