Java后端 学习路线 笔记汇总表【黑马程序员】JavaWeb黑马旅游网-学习笔记01【准备工作】JavaWeb黑马旅游网-学习笔记02【注册功能】JavaWeb黑马旅游网-学习笔记03【登陆和退出功能】JavaWeb黑马旅游网-学习笔记04【BaseServlet抽取】JavaWeb黑马旅游网-学习笔记05【分类数据展示功能】JavaWeb黑马旅游网-学习笔记06【旅游线路分页展示分页展示】JavaWeb黑马旅游网-学习笔记07【旅游线路查询】JavaWeb黑马旅游网-学习笔记08【旅游线路详情】JavaWeb黑马旅游网-学习笔记09【旅游线路收藏】JavaWeb黑马旅游网-学习笔记10【项目代码】
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
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。
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idString rid = request.getParameter("rid");//2. 获取当前登录的用户 userUser user = (User) request.getSession().getAttribute("user");int uid;//用户idif (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
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
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ridString 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idif (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
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ridString 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idif (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》
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