JavaWeb黑马旅游网-学习笔记09【旅游线路收藏】

男娘i 2022-10-23 15:26 153阅读 0赞

>  *  **[Java后端 学习路线 笔记汇总表【黑马程序员】][Java_ _]**
> 
> 1.  [JavaWeb黑马旅游网-学习笔记01【准备工作】][JavaWeb_-_01]
> 2.  [JavaWeb黑马旅游网-学习笔记02【注册功能】][JavaWeb_-_02]
> 3.  [JavaWeb黑马旅游网-学习笔记03【登陆和退出功能】][JavaWeb_-_03]
> 4.  [JavaWeb黑马旅游网-学习笔记04【BaseServlet抽取】][JavaWeb_-_04_BaseServlet]
> 5.  [JavaWeb黑马旅游网-学习笔记05【分类数据展示功能】][JavaWeb_-_05]
> 6.  [JavaWeb黑马旅游网-学习笔记06【旅游线路分页展示分页展示】][JavaWeb_-_06]
> 7.  [JavaWeb黑马旅游网-学习笔记07【旅游线路查询】][JavaWeb_-_07]
> 8.  [JavaWeb黑马旅游网-学习笔记08【旅游线路详情】][JavaWeb_-_08]
> 9.  [JavaWeb黑马旅游网-学习笔记09【旅游线路收藏】][JavaWeb_-_09]
> 10. [JavaWeb黑马旅游网-学习笔记10【项目代码】][JavaWeb_-_10]

**目录**

46-旅游线路收藏\_分析

判断当前登录用户是否收藏过该线路

47-旅游线路收藏\_判断是否收藏\_后台代码

RouteServlet.java

FavoriteService.java

FavoriteDao.java

48-旅游线路收藏\_判断是否收藏\_前台代码

49-旅游线路收藏\_收藏次数动态展示

50-旅游线路收藏\_点击按钮收藏\_分析

51-旅游线路收藏\_点击按钮收藏\_后台代码

RouteServlet.java

52-旅游线路收藏\_点击按钮收藏\_前台代码

53-旅游线路收藏\_点击按钮收藏\_前台效果优化

RouteServlet.java

FavoriteService.java

FavoriteDao.java

--------------------

# 46-旅游线路收藏\_分析 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70][]
> 
> ![20210302202918442.png][] ![20210302202932194.png][]

## 判断当前登录用户是否收藏过该线路 ##

> 当页面加载完成后，发送ajax请求，获取用户是否收藏的标记。
> 
> 根据标记，展示不同的按钮样式。
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 1][]

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 2][]

# 47-旅游线路收藏\_判断是否收藏\_后台代码 #

## RouteServlet.java ##

package cn.itcast.travel.web.servlet;
    
    import cn.itcast.travel.domain.PageBean;
    import cn.itcast.travel.domain.Route;
    import cn.itcast.travel.domain.User;
    import cn.itcast.travel.service.FavoriteService;
    import cn.itcast.travel.service.RouteService;
    import cn.itcast.travel.service.impl.FavoriteServiceImpl;
    import cn.itcast.travel.service.impl.RouteServiceImpl;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    @WebServlet("/route/*")
    public class RouteServlet extends BaseServlet {
        private RouteService routeService = new RouteServiceImpl();
    
        private FavoriteService favoriteService = new FavoriteServiceImpl();
    
        /**
         * 判断当前登录用户是否收藏过该线路
         *
         * @param request
         * @param response
         * @throws ServletException
         * @throws IOException
         */
        public void isFavorite(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //1. 获取线路id
            String rid = request.getParameter("rid");
            //2. 获取当前登录的用户 user
            User user = (User) request.getSession().getAttribute("user");
            int uid;//用户id
            if (user == null) {
                //用户尚未登录
                uid = 0;
            } else {
                //用户已经登录
                uid = user.getUid();
            }
            //3. 调用FavoriteService查询是否收藏
            boolean flag = favoriteService.isFavorite(rid, uid);
            //4. 写回客户端
            writeValue(flag, response);
        }
    }

## FavoriteService.java ##

package cn.itcast.travel.service;
    
    public interface FavoriteService {
        /**
         * 判断是否收藏
         *
         * @param rid
         * @param uid
         * @return
         */
        public boolean isFavorite(String rid, int uid);
    
        /**
         * 添加收藏
         *
         * @param rid
         * @param uid
         */
        void add(String rid, int uid);
    }

## FavoriteDao.java ##

package cn.itcast.travel.dao;
    
    import cn.itcast.travel.domain.Favorite;
    
    public interface FavoriteDao {
        /**
         * 根据rid和uid查询收藏信息
         *
         * @param rid
         * @param uid
         * @return
         */
        public Favorite findByRidAndUid(int rid, int uid);
    
        /**
         * 根据rid 查询收藏次数
         *
         * @param rid
         * @return
         */
        public int findCountByRid(int rid);
    
        /**
         * 添加收藏
         *
         * @param i
         * @param uid
         */
        void add(int i, int uid);
    }

# 48-旅游线路收藏\_判断是否收藏\_前台代码 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 3][]

# 49-旅游线路收藏\_收藏次数动态展示 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 4][]
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 5][]
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 6][]
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 7][]

# 50-旅游线路收藏\_点击按钮收藏\_分析 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 8][]

# 51-旅游线路收藏\_点击按钮收藏\_后台代码 #

## RouteServlet.java ##

package cn.itcast.travel.web.servlet;
    
    import cn.itcast.travel.domain.PageBean;
    import cn.itcast.travel.domain.Route;
    import cn.itcast.travel.domain.User;
    import cn.itcast.travel.service.FavoriteService;
    import cn.itcast.travel.service.RouteService;
    import cn.itcast.travel.service.impl.FavoriteServiceImpl;
    import cn.itcast.travel.service.impl.RouteServiceImpl;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    @WebServlet("/route/*")
    public class RouteServlet extends BaseServlet {
        private RouteService routeService = new RouteServiceImpl();
    
        private FavoriteService favoriteService = new FavoriteServiceImpl();
    
        /**
         * 添加收藏
         *
         * @param request
         * @param response
         * @throws ServletException
         * @throws IOException
         */
        public void addFavorite(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //1. 获取线路rid
            String rid = request.getParameter("rid");
            //2. 获取当前登录的用户
            User user = (User) request.getSession().getAttribute("user");
            int uid;//用户id
            if (user == null) {
                //用户尚未登录
                return;
            } else {
                //用户已经登录
                uid = user.getUid();
            }
            //3. 调用service添加
            favoriteService.add(rid, uid);
        }
    }

# 52-旅游线路收藏\_点击按钮收藏\_前台代码 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 9][]

# 53-旅游线路收藏\_点击按钮收藏\_前台效果优化 #

## RouteServlet.java ##

/**
     * 添加收藏
     *
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void addFavorite(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1. 获取线路rid
        String rid = request.getParameter("rid");
        //2. 获取当前登录的用户
        User user = (User) request.getSession().getAttribute("user");
        int uid;//用户id
        if (user == null) {
            //用户尚未登录
            return;
        } else {
            //用户已经登录
            uid = user.getUid();
        }
        //3. 调用service添加
        favoriteService.add(rid, uid);
    }

## FavoriteService.java ##

package cn.itcast.travel.service;
    
    public interface FavoriteService {
        /**
         * 添加收藏
         *
         * @param rid
         * @param uid
         */
        void add(String rid, int uid);
    }

## FavoriteDao.java ##

package cn.itcast.travel.dao;
    
    import cn.itcast.travel.domain.Favorite;
    
    public interface FavoriteDao {
        /**
         * 添加收藏
         *
         * @param i
         * @param uid
         */
        void add(int i, int uid);
    }

> 你要尽全力保护你的梦想。那些嘲笑你梦想的人，因为他们必定会失败，他们想把你变成和他们一样的人。 ---《当幸福来敲门》

[Java_ _]: https://blog.csdn.net/weixin_44949135/article/details/113773297
[JavaWeb_-_01]: https://blog.csdn.net/weixin_44949135/article/details/114031199
[JavaWeb_-_02]: https://blog.csdn.net/weixin_44949135/article/details/114121075
[JavaWeb_-_03]: https://blog.csdn.net/weixin_44949135/article/details/114229387
[JavaWeb_-_04_BaseServlet]: https://blog.csdn.net/weixin_44949135/article/details/114259853
[JavaWeb_-_05]: https://blog.csdn.net/weixin_44949135/article/details/114272117
[JavaWeb_-_06]: https://blog.csdn.net/weixin_44949135/article/details/114283166
[JavaWeb_-_07]: https://blog.csdn.net/weixin_44949135/article/details/114288829
[JavaWeb_-_08]: https://blog.csdn.net/weixin_44949135/article/details/114291075
[JavaWeb_-_09]: https://blog.csdn.net/weixin_44949135/article/details/114293637
[JavaWeb_-_10]: https://blog.csdn.net/weixin_44949135/article/details/114305933
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