Campus second-hand trading platform based on SSM

In the course design of the final term, I made up a group of three. Two roommates and I decided to build a second-hand trading platform on campus. At the beginning, we were full of interest and passion, but the later time conflict made the three of us a little tired for this project. It was just two days after the project was decided. BezosLee had passed 360’s online written test and received a free training invitation from 360 company, so she had to go to 360 headquarters in Beijing for a week of training. Fortunately, after the training, she had an interview and got the internship Offer. At the end of April, L_75 had a one-week ACM training to prepare for the Shandong ACM competition on May 9. Fortunately, as his retirement competition, he won a bronze medal. As for me, I am preparing for the postgraduate entrance examination. Besides the volleyball training at 6:00 am every day for the school volleyball league at the end of May, I also need to study English and advanced mathematics every day. But I’m sure the three of us will do well, do what we want, do what we love.

In today’s university campuses, with the improvement of students’ purchasing ability and the annual admission and graduation, there are many types of second-hand goods. At present, second-hand commodity trading has become a popular after-school life of contemporary college students. Taking our school as an example, the “flea” market is held every year, which shows the demand of college students for second-hand goods trading. However, this way has many limitations and contingency, which is far from meeting the demand of students.

The establishment of a campus second-hand trading platform can greatly facilitate students in school, convenient students also create a glorious saving, waste shameful campus cultural atmosphere. The most important is that it can also through the network will not use their own things on the Internet, can also find their own needs on the Internet, inexpensive, to achieve a win-win situation.

　　

　　　　　　　　　　　　　　　System use case diagrams

　　　　　　　　　　　　　　　

Each user has his or her own published idle items. In the personal center module, you can view the published idle items and delete and modify the corresponding items. The GoodsExtand class is introduced because objects and images have a one-to-many relationship.

public class GoodsExtend {
    private Goods goods;
    private List<Image> images = new ArrayList<Image>();
    /** omit the getter/setter method */
}Copy the code

This module is to get all the commodity information published by the user. Obtain the user information from session, query the commodities released by the user according to the user ID, obtain the corresponding picture information of the commodities according to the commodity ID, and finally return the associated objects of the commodities and pictures, as well as the corresponding commodity information and picture information to the foreground for display.

@RequestMapping(value = "/allGoods")
public ModelAndView goods(HttpServletRequest request) {
    User cur_user = (User)request.getSession().getAttribute("cur_user");
    Integer userId = cur_user.getId();
    List<Goods> goodsList = goodsService.getGoodsByUserId(userId);
    List<GoodsExtend> goodsAndImage = new ArrayList<GoodsExtend>();
    for (int i = 0; i < goodsList.size() ; i++) {
        // Encapsulate the user information and image information into the GoodsExtend class and pass it to the foreground
        GoodsExtend goodsExtend = new GoodsExtend();
        Goods goods = goodsList.get(i);
        List<Image> images = imageService.getImagesByGoodsPrimaryKey(goods.getId());
        goodsExtend.setGoods(goods);
        goodsExtend.setImages(images);
        goodsAndImage.add(i, goodsExtend);
    }
    ModelAndView mv = new ModelAndView();
    mv.addObject("goodsAndImage",goodsAndImage);
    mv.setViewName("/user/goods");
    return mv;
}Copy the code

On the main page of the system, the items are divided into 7 categories, such as the latest release, idle digital, campus transport, electrical appliances and daily use, books and teaching materials, cosmetics and clothing, sports chess and cards, tickets and small objects. Click the classification name, request the background, the background database of goods for the classification of foreign key query, the commodity information returned to the page, the page will jump to show the corresponding classification of commodity information.

　　

At the top of the home page, a search box is added. If you enter the keyword in the search box, the background will be requested. The background will query the name and description in the commodity list according to the keyword, query the commodity with the keyword and the picture information of the object, and return to the foreground to display the corresponding commodity information, such as query: Book, you can query the goods of the book, and avoid the error that the name of the goods does not take the word “book”.

　　

Click classification, can be achieved under the classification, query the corresponding commodity information, in the classification, also can be fuzzy query, but in the classification of fuzzy, matching is catelog_id, and then match the name and describle in the category, for example, in the campus walk classification input: Emma, the query is the campus under the “Emma” commodity information.

　　

　　

@RequestMapping(value = "/catelog/{id}")
public ModelAndView catelogGoods(HttpServletRequest request,@PathVariable("id") Integer id,
                                 @RequestParam(value = "str",required = false) String str) throws Exception {
    List<Goods> goodsList = goodsService.getGoodsByCatelog(id,str,str);
    Catelog catelog = catelogService.selectByPrimaryKey(id);
    List<GoodsExtend> goodsExtendList = new ArrayList<GoodsExtend>();
    for(int i = 0; i<goodsList.size(); i++) { GoodsExtend goodsExtend =new GoodsExtend();
        Goods goods = goodsList.get(i);
        List<Image> imageList = imageService.getImagesByGoodsPrimaryKey(goods.getId());
        goodsExtend.setGoods(goods);
        goodsExtend.setImages(imageList);
        goodsExtendList.add(i,goodsExtend);
    }
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject("goodsExtendList", goodsExtendList);
    modelAndView.addObject("catelog", catelog);
    modelAndView.addObject("search",str);
    modelAndView.setViewName("/goods/catelogGoods");
    return modelAndView;
}Copy the code

Commodity management module also adopts the form of tables, supporting multi-condition query, paging, view details and other operations, the difference is that commodity information can not be modified but can be deleted. Click the name of the product to enter the details page, showing all the data of the product.

　　

The Squirrel Workshop has realized the basic functions of a second-hand transaction platform on campus. Since alipay’s payment interface cannot be introduced, offline transactions can only be carried out, which adds a lot of difficulties to the management of goods and the transactions between sellers and buyers. Although the platform has no special functions, we have achieved it with the efforts of the three of us. Although there is a gap with the initial expectation, we are still satisfied.