Springboot+Nodejs+Vue实现前后端分离校园二手交易平台

作者主页：编程千纸鹤

作者简介：Java、前端、Pythone开发多年，做过高程，项目经理，架构师

主要内容：Java项目开发、毕业设计开发、面试技术整理、最新技术分享

项目编号：BS-PT-066

一，项目简介

本项目基于springboot+vue实现了一个前后端分离模式的校园二手交易平台。校内师生可以在此平台上注册自己的账户，然后发布自己想要处理的二手物品，平台本身不实现在线交易功能，发布的二手物品由买卖双方自行联系进行线下交易。主要实现的功能有用户注册、登陆、发布商品、收藏商品、统计浏览量和收藏量、在线留言、全文检索、管理个人发布的商品和留言等功能。系统功能完整，业务模式清晰，开发结构简单，比较符合目前后端分离模式开发的主流诉求，可以用作毕业设计或课程设计以及期未作业使用。

二，环境介绍

语言环境：Java:  jdk1.8

数据库：Mysql: mysql5.7   REDIS缓存数据库

应用服务器：Tomcat:  tomcat8.5.31

开发工具：IDEA或eclipse

后台开发技术：springboot+mybatisplus+jdk8+mysql5.6

前后台开发技术：VUE+ElementsUI

三，系统展示

用户登陆注册

发布二手物品

查看详情

查看我的收藏

查看我发布的商品：可以进行商品上下架 和删除操作

管理我发布的留言

四，核心代码展示

package cn.fleamarket.controller;

import cn.fleamarket.common.R;
import cn.fleamarket.domain.Favorites;
import cn.fleamarket.domain.User;
import cn.fleamarket.service.FavoritesService;
import cn.fleamarket.service.UserService;
import cn.fleamarket.utils.StringTool;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;


/**
 * 产品收藏表
 *
 * @author znz
 * @date 2022-09-12 10:46:22
 */
@RestController
@RequestMapping("/favorites")
public class FavoritesController {

    @Autowired
    private FavoritesService favoritesService;


    @Autowired
    UserService userService;

    @PostMapping(value = "/favoriteList", produces = "application/json")
    @ApiOperation("收藏分页查询列表,入参是page:第几页,number:每页几条")
    public R> favoritesList(@RequestBody Map params) {
        if (Objects.isNull(params)) {
            return R.error("参数错误!");
        }
        User nowUser = userService.qureyByUserName(params.getOrDefault("username","").toString());
        if (Objects.isNull(nowUser)) {
            return R.error("用户未登录!");
        }
        params.put("userId",nowUser.getId());
        Page favoritesPage = favoritesService.selectListPage(params);

        List data = favoritesPage
                .getRecords().stream()
                .filter(distinctByKey(Favorites::getProductId))
                .collect(Collectors.toList());

        return R.pageBuild(favoritesPage.getTotal(),
                favoritesPage.hasNext(),
                favoritesPage.hasPrevious(), data);
    }

    @PostMapping(value = "/addFavorites", produces = "application/json")
    @ApiOperation("添加收藏,pid:商品id")
    public JSONObject addFavorites(@RequestBody JSONObject jsonObject, HttpServletRequest request, HttpServletResponse response) {
        JSONObject ret = new JSONObject();
        User user = null;
        try {
            user =  userService.qureyByUserName(jsonObject.getString("username"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            List list = favoritesService.selectByUid(user.getId());
            if (list.size() != 0) {
                for (int i = 0; i < list.size(); i++) {
                    if (list.get(i).getProductId().equals(jsonObject.getString("pid"))) {
                        ret.put("code", -1);
                        ret.put("data", false);
                        ret.put("msg", "添加失败");
                        return ret;
                    }
                }
            }
            if (user != null) {
                String productId = jsonObject.getString("pid");
                Integer state = jsonObject.getInteger("state");
                Favorites favorites = new Favorites();
                favorites.setId(StringTool.getUUID());
                favorites.setUserId(user.getId());
                favorites.setProductId(productId);
                favorites.setCreateTime(new Date());
                favorites.setState(state);
                Integer isS = favoritesService.addFavorites(favorites);
                if (isS > 0) {
                    ret.put("data", true);
                    ret.put("code", 0);
                    ret.put("msg", "添加成功");
                } else {
                    ret.put("code", -1);
                    ret.put("data", false);
                    ret.put("msg", "添加失败");
                }
            } else {
                ret.put("msg", "用户未登录");
            }

        } catch (Exception e) {
            e.printStackTrace();
            ret.put("code", -1);
            ret.put("data", false);
            ret.put("msg", "未知错误");
        }
        return ret;
    }

    @PostMapping(value = "/deleteFavorites", produces = "application/json")
    @ApiOperation("删除收藏,fid:收藏id")
    public JSONObject deleteFavorites(@RequestBody JSONObject jsonObject, HttpServletRequest request, HttpServletResponse response) {
        JSONObject ret = new JSONObject();
        User user = null;
        try {
            user = userService.qureyByUserName(jsonObject.getString("username"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            if (user != null) {
                String fid = jsonObject.getString("fid");
                Integer isS = favoritesService.deleteFavorites(fid);
                if (isS > 0) {
                    ret.put("code", 0);
                    ret.put("data", true);
                    ret.put("msg", "删除成功");
                }
            } else {
                ret.put("msg", "用户未登录");
            }
        } catch (Exception e) {
            e.printStackTrace();
            ret.put("code", -1);
            ret.put("data", false);
            ret.put("msg", "删除失败");
        }
        return ret;
    }


    private static  Predicate distinctByKey(Function keyExtractor) {
        Map seen = new ConcurrentHashMap<>();
        return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
    }


}

package cn.fleamarket.controller;

import cn.fleamarket.common.R;
import cn.fleamarket.config.PathConfig;
import cn.fleamarket.domain.Image;
import cn.fleamarket.service.ImageService;
import cn.fleamarket.utils.StringTool;
import com.alibaba.fastjson.JSONObject;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.SneakyThrows;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.util.Objects;


/**
 * 图片表
 *
 * @author znz
 * @date 2022-09-12 10:46:22
 */
@RestController
@RequestMapping("/image")
@Api("图片接口")
@CrossOrigin
public class ImageController {

    @Autowired
    ImageService imageService;

    @Autowired
    private PathConfig pathConfig;


    /**
     * 上传img
     *
     * @param file 文件
     * @return {@link JSONObject}
     */
    @SneakyThrows
    @PostMapping("/uploadImg")
    @ApiOperation("图片上传")
    public R uploadImg(MultipartFile file) {
        JSONObject ret = new JSONObject();
        String fileName = file.getOriginalFilename();
        String newFileName = StringTool.getUUID() + Objects.requireNonNull(fileName).substring(fileName.indexOf("."));
        Image image = new Image();
        File file1;
        String os = System.getProperty("os.name");
        if (os.toLowerCase().startsWith("win")) {
            file1 = new File(pathConfig.getWinPath(), newFileName);
        } else {
            file1 = new File(pathConfig.getWinPath(), newFileName);
        }

        if (!file1.exists()) {
            System.out.println(file1.mkdir());
        }
        file.transferTo(file1);
        image.setId(StringTool.getUUID());
        image.setImgUrl(newFileName);
        imageService.insert(image);
        return R.ok(0,"图片上传成功",File.separator + "static" + File.separator + "img" + File.separator + image.getImgUrl());
    }
}

package cn.fleamarket.controller;

import cn.fleamarket.domain.Message;
import cn.fleamarket.domain.User;
import cn.fleamarket.service.MessageService;
import cn.fleamarket.service.UserService;
import cn.fleamarket.utils.StringTool;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 留言接口
 */
@RestController
@RequestMapping("/message")
@Api("留言接口")
public class MessageController {
    @Autowired
    MessageService messageService;
    @Autowired
    UserService userService;

    @PostMapping(value = "/messageList", produces = "application/json")
    @ApiOperation("分页查询留言列表,入参是page:第几页,number:每页几条,pId:属于哪个商品的id")
    public JSONObject messageList(@RequestBody JSONObject jsonObject) {
        JSONObject ret = new JSONObject();
        try {
            Long page = jsonObject.getLong("page");
            Long number = jsonObject.getLong("number");
            String pId = jsonObject.getString("pId");
            Map map = new HashMap<>();
            map.put("page", page);
            map.put("number", number);
            map.put("pId", pId);
            if (page != null && number != null) {
                Page messagePage = messageService.selectListPage(map);
                List messagesList = messagePage.getRecords();
                ret.put("code", 0);
                ret.put("data", StringTool.ListToJsonArray(messagesList));
                ret.put("total", messagePage.getTotal());//总数
                ret.put("next", messagePage.hasNext());//下一页
                ret.put("previous", messagePage.hasPrevious());//上一页
                ret.put("msg", "查询成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
            ret.put("code", -1);
            ret.put("data", null);
            ret.put("msg", "查询失败");
        }
        return ret;
    }

    @PostMapping("/addMessage")
    @ApiOperation("新增留言接口，text:留言内容,tid:发送人(不用填),fid:接受人(填商品id)")
    public JSONObject addMessage(@RequestBody JSONObject jsonObject, HttpServletRequest request) {
        JSONObject ret = new JSONObject();
        Message message = new Message();
        try {
            User user = userService.qureyByUserName(jsonObject.getString("username"));
            message.setTid(user.getId());
            message.setTime(new Date());
            message.setId(StringTool.getUUID());
            message.setFid(jsonObject.getString("fid"));
            message.setText(jsonObject.getString("text"));
            if (messageService.addMessage(message) > 0) {
                ret.put("code", 0);
                ret.put("data", true);
                ret.put("msg", "新增留言成功");
            } else {
                ret.put("code", -1);
                ret.put("data", false);
                ret.put("msg", "新增留言失败");
            }

        } catch (Exception e) {
            e.printStackTrace();
            ret.put("code", -1);
            ret.put("data", false);
            ret.put("msg", "新增留言失败");
        }
        return ret;
    }

    @PostMapping(value = "/messageListByUser", produces = "application/json")
    @ApiOperation("分页查询我的留言,入参是page:第几页,number:每页几条")
    public JSONObject productListByUser(@RequestBody JSONObject jsonObject, HttpServletRequest request) {
        JSONObject ret = new JSONObject();
        try {
            Long page = jsonObject.getLong("page");
            Long number = jsonObject.getLong("number");
            Map map = new HashMap<>();
            User user = userService.qureyByUserName(jsonObject.getString("username"));
            map.put("page", page);
            map.put("number", number);
            map.put("userId", user.getId());
            if (page != null && number != null) {
                Page messagePage = messageService.selectListPageByUser(map);
                List messageList = messagePage.getRecords();
                ret.put("code", 0);
                  ret.put("data", StringTool.ListToJsonArray(messageList));
                ret.put("total", messagePage.getTotal());//总数
                ret.put("next", messagePage.hasNext());//下一页
                ret.put("previous", messagePage.hasPrevious());//上一页
                ret.put("msg", "查询成功");
            }
        } catch (Exception e) {
            ret.put("code", -1);
            ret.put("data", null);
            ret.put("msg", "查询失败");
            e.printStackTrace();
        }
        return ret;
    }

    @PostMapping("/delete")
    @ApiOperation("删除留言接口，主要传留言id即可")
    public JSONObject delete(@RequestBody JSONObject jsonObject, HttpServletRequest request) {
        JSONObject ret = new JSONObject();
        String pId = jsonObject.getString("id");
        User user = null;
        try {
            user = userService.qureyByUserName(jsonObject.getString("username"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            int i = messageService.delete(user.getId(), pId);
            if (i > 0) {
                ret.put("code", "0");
                ret.put("data", true);
                ret.put("msg", "删除留言成功");
            } else {
                ret.put("code", "-1");
                ret.put("data", false)        ;
                ret.put("msg", "删除留言失败");
            }
        } catch (Exception e) {
            ret.put("code", "-1");
            ret.put("data", false);
            ret.put("msg", "删除留言失败");
            e.printStackTrace();
        }
        return ret;
    }
}

package cn.fleamarket.controller;

import java.util.*;


import cn.fleamarket.domain.Product;
import cn.fleamarket.domain.User;
import cn.fleamarket.service.MessageService;
import cn.fleamarket.service.ProductService;
import cn.fleamarket.service.UserService;
import cn.fleamarket.utils.StringTool;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;


/**
 * 商品表
 *
 * @author znz
 * @email ${email}
 * @date 2022-09-12 10:46:22
 */
@RestController
@RequestMapping("/product")
@Api("商品接口")
public class ProductController {
    @Autowired
    ProductService productService;
    @Autowired
    UserService userService;
    @Autowired
    MessageService messageService;

    @PostMapping(value = "/productList", produces = "application/json")
    @ApiOperation("分页查询列表,入参是page:第几页,number:每页几条，key:查询条件(可选)")
    public JSONObject productList(@RequestBody JSONObject jsonObject) {
        JSONObject ret = new JSONObject();
        try {
            Long page = jsonObject.getLong("page");
            Long number = jsonObject.getLong("number");
            String key = jsonObject.getString("key");
            JSONArray jsonArray = jsonObject.getJSONArray("pId");
            Map map = new HashMap<>();
            map.put("page", page);
            map.put("number", number);
            map.put("key", key);
            if (page != null && number != null) {
                Page productPage = productService.selectListPage(map);
                List productList = productPage.getRecords();
                ret.put("code", 0);
                ret.put("data", StringTool.ListToJsonArray(productList));
                ret.put("total", productPage.getTotal());//总数
                ret.put("next", productPage.hasNext());//下一页
                ret.put("previous", productPage.hasPrevious());//上一页
                ret.put("msg", "查询成功");
                return ret;
            }
            if (jsonArray.size() != 0 && jsonArray != null) {
                List list = new ArrayList<>();
                for (int i = 0; i < jsonArray.size(); i++) {
                    Product product = productService.selectById(jsonArray.get(i).toString());
                    list.add(product);
                }
                ret.put("code", 0);
                ret.put("data", StringTool.ListToJsonArray(list));
                ret.put("msg", "查询成功");
                return ret;
            }
        } catch (Exception e) {
            ret.put("code", -1);
            ret.put("data", null);
            ret.put("msg", "查询失败");
        }
        return ret;
    }

    @PostMapping(value = "/productListByUser", produces = "application/json")
    @ApiOperation("分页查询属于某个用户的商品列表,就是我发布的商品,入参是page:第几页,number:每页几条")
    public JSONObject productListByUser(@RequestBody JSONObject jsonObject, HttpServletRequest request) {
        JSONObject ret = new JSONObject();
        try {
            Long page = jsonObject.getLong("page");
            Long number = jsonObject.getLong("number");
            Map map = new HashMap<>();
            User user = userService.qureyByUserName(jsonObject.getString("username"));
            map.put("page", page);
            map.put("number", number);
            map.put("userId", user.getId());
            if (page != null && number != null) {
                Page productPage = productService.selectListPageByUser(map);
                List productList = productPage.getRecords();
                ret.put("code", 0);
                ret.put("data", StringTool.ListToJsonArray(productList));
                ret.put("total", productPage.getTotal());//总数
                ret.put("next", productPage.hasNext());//下一页
                ret.put("previous", productPage.hasPrevious());//上一页
                ret.put("msg", "查询成功");
            }
        } catch (Exception e) {
            ret.put("code", -1);
            ret.put("data", null);
            ret.put("msg", "查询失败");
        }
        return ret;
    }

    @PostMapping(value = "/productListById", produces = "application/json")
    @ApiOperation("分页查询属于某个用户的商品列表,就是我发布的商品,入参是page:第几页,number:每页几条")
    public JSONObject productListById(@RequestBody JSONObject jsonObject, HttpServletRequest request) {
        JSONObject ret = new JSONObject();
        try {
            Long page = jsonObject.getLong("page");
            Long number = jsonObject.getLong("number");
            Object[] pIds = jsonObject.getJSONArray("pId").toArray();
            List