JavaWeb图书商城网上书城

前言

博主使用JavaWeb开发的一款商城项目，可以衍生出其他各种商品销售网站
前台：书籍查看，分页，购物车，个人信息，登录注册，按类别检索
后台：用户管理，类别管理，用户管理，订单管理

JavaWeb网上书店运行视频

下面介绍下该项目的实现过程

数据库设计

首先是数据库：

项目目录：

工具类

数据库操作

public class DBUtil {// 数据库驱动程序private String driver;// 数据库连接信息private String url;// 连接数据库的用户名private String username;// 连接数据库的密码private String password;// 连接对象private Connection con;// 预编译语句对象private PreparedStatement pstmt;// 查询结果分页时，每页显示记录数。public static final long PAGE_REC_NUM = 8;public void setDriver(String driver) {this.driver = driver;}public void setUrl(String url) {this.url = url;}public void setUsername(String username) {this.username = username;}public void setPassword(String password) {this.password = password;}public DBUtil() {driver = "com.mysql.jdbc.Driver";url = "jdbc:mysql://localhost:3306/good_shop?characterEncoding=utf8&serverTimezone=UTC&useSSL=false";    // 数据库名meal可变username = "root";password = "px980305";  // 数据库密码可变}// 初始化方法，加载驱动程序，获得数据库的连接对象。private void init() {try {Class.forName(driver);con = DriverManager.getConnection(url, username, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}}// 数据库操作对象的关闭private void close() {if (pstmt != null) {try {pstmt.close();} catch (SQLException e) {e.printStackTrace();}}if (con != null) {try {con.close();} catch (SQLException e) {e.printStackTrace();}}}// 为预编译的SQL语句中的占位符?设置值，值被放在字符串数组params中。private void setParams(String[] params) {if (params != null) {for (int i = 0; i < params.length; i++) {try {pstmt.setString(i + 1, params[i]);} catch (SQLException e) {e.printStackTrace();}}}}// 执行更新类（增删改）的SQL语句，SQL语句中含有占位符。public int update(String sql, String[] params) {int result = 0;init();try {pstmt = con.prepareStatement(sql);setParams(params);result = pstmt.executeUpdate();} catch (SQLException e) {e.printStackTrace();} finally {close();}return result;}// 执行更新类（增删改）的SQL语句，SQL语句中不含有占位符。public int update(String sql) {return update(sql, null);}// 执行返回多条记录的查询操作，结果被封装到List中。public List<Map<String, String>> getList(String sql, String[] params) {List<Map<String, String>> list = null;init();try {pstmt = con.prepareStatement(sql);setParams(params);ResultSet rs = pstmt.executeQuery();list = getListFromRS(rs);rs.close();} catch (Exception e) {e.printStackTrace();} finally {close();}return list;}public List<Map<String, String>> getList(String sql) {return getList(sql, null);}// 执行返回至多一条记录的查询操作，结果被封装到Map中。public Map<String, String> getMap(String sql, String[] params) {Map<String, String> m = null;List<Map<String, String>> l = getList(sql, params);if (l != null && l.size() != 0) {m = (Map<String, String>) (l.get(0));}return m;}public Map<String, String> getMap(String sql) {return getMap(sql, null);}// 将结果集中的内容封装到List中private List<Map<String, String>> getListFromRS(ResultSet rs) throws SQLException {List<Map<String, String>> list = new ArrayList<Map<String, String>>();ResultSetMetaData rsmd = rs.getMetaData();while (rs.next()) {Map<String, String> m = new HashMap<String, String>();for (int i = 1; i <= rsmd.getColumnCount(); i++) {String colName = rsmd.getColumnLabel(i);String s = rs.getString(colName);if (s != null) {m.put(colName, s);}}list.add(m);}return list;}// 查询结果分页时，返回分页信息的Map，包括总页数，每页记录数和当前页中的记录。public Map<String, Object> getPage(String sql, String[] params, String curPage) {Map<String, Object> page = new HashMap<String, Object>();String newSql = sql + " limit " + (Long.parseLong(curPage) - 1) * PAGE_REC_NUM + "," + PAGE_REC_NUM;List<Map<String, String>> pageList = getList(newSql, params);sql = sql.toLowerCase();String countSql = "";if (sql.indexOf("group") >= 0) {countSql = "select count(*) as tempNum from (" + sql + ") as temp";} else {countSql = "select count(*) as tempNum " + sql.substring(sql.indexOf("from"));}String count_s = (String) getMap(countSql, params).get("tempNum");long count = Long.parseLong(count_s);long totalPage = 0;if (count % PAGE_REC_NUM == 0)totalPage = count / PAGE_REC_NUM;elsetotalPage = count / PAGE_REC_NUM + 1;page.put("list", pageList);page.put("totalPage", totalPage);page.put("curpage", curPage);page.put("recNum", PAGE_REC_NUM);return page;}public Map<String, Object> getPage(String sql, String curPage) {return getPage(sql, null, curPage);}
}

文件下载与图片上传

package util;import java.io.File;
import java.io.IOException;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Part;public class FileUploadUtil {// 上传单一文件public static String uploadSingleFile(Part part, HttpServletRequest request) {String path = null;String fileName = getFileName(part);if (!fileName.equals("")) {// 得到上传文件的文件扩展名String fileExtName = getFileExtName(part);String newFileName = System.currentTimeMillis() + fileExtName;// 得到上传文件保存路径的服务器端硬盘物理路径String savePath = request.getServletContext().getRealPath("/img");File f = new File(savePath);if (!f.exists()) {f.mkdirs();}// 文件上传try {part.write(savePath + File.separator + newFileName);path = "img/" + newFileName;} catch (IOException e) {e.printStackTrace();}}return path;}/*** 根据请求头解析出文件名 请求头的格式：火狐和google浏览器下：form-data; name="file";* filename="snmp4j--api.zip" IE浏览器下：form-data; name="file";* filename="E:\snmp4j--api.zip"* * @param header 请求头* @return 文件名*/public static String getFileName(Part part) {/*** String[] tempArr1 = header.split(";");代码执行完之后，在不同的浏览器下，tempArr1数组里面的内容稍有区别* 火狐或者google浏览器下：tempArr1={form-data,name="file",filename="snmp4j--api.zip"}* IE浏览器下：tempArr1={form-data,name="file",filename="E:\snmp4j--api.zip"}*/String header = part.getHeader("content-disposition");String[] tempArr1 = header.split(";");/*** 火狐或者google浏览器下：tempArr2={filename,"snmp4j--api.zip"}* IE浏览器下：tempArr2={filename,"E:\snmp4j--api.zip"}*/String[] tempArr2 = tempArr1[2].split("=");// 获取文件名，兼容各种浏览器的写法String fileName = tempArr2[1].substring(tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", "");return fileName;}public static String getFileExtName(Part part) {String fileName = getFileName(part);if(fileName.equals("")) {return "";}else {return fileName.substring(fileName.lastIndexOf("."));}}
}

时间格式转换

public class Times {public String getTime(){Long timeStamp = System.currentTimeMillis();  //获取当前时间戳SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String time = sdf.format(new Date(Long.parseLong(String.valueOf(timeStamp)))); return time;}}

Controller控制器（servlet)

管理员获取所有商品的servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");String gname=request.getParameter("gname");if(gname==""){gname="";}String curpage=request.getParameter("curpage");if(curpage==""){curpage="1";}Map<String, Object> cars=gs.getGoodsPage(gname, curpage);request.setAttribute("goods", cars);request.getRequestDispatcher("/admin/good_list.jsp").forward(request, response);}

商品数据库操作 service和dao结合了

public class GoodService {DBUtil db=new DBUtil();public  List<Map<String,String>> getGoods(String gname){String sql = "select goods.id id,goods.gname gname,goods.price price ,types.typename typename,goods.image image from goods inner join types on types.id=goods.typeid where goods.gname like '%"+gname+"%' order by id";return db.getList(sql);}public  Map<String, Object> getGoodsPage(String gname,String curpage,String uid){String sql = "select goods.id id,goods.gname gname,goods.price price ,types.typename typename,goods.image image from goods inner join types on types.id=goods.typeid where goods.gname like '%"+gname+"%' and goods.uid=? ";String[] params = new String[]{uid};return db.getPage(sql, params, curpage);}public  Map<String, Object> getGoodsPage(String gname,String curpage){String sql = "select goods.id id,goods.gname gname,goods.price price ,types.typename typename,goods.image image from goods inner join types on types.id=goods.typeid where goods.gname like '%"+gname+"%' ";return db.getPage(sql, null, curpage);}public  List<Map<String,String>> getGoodsByType(String type){String sql = "select goods.id id,goods.gname gname,goods.price price ,goods.info info,types.typename typename,goods.image image from goods inner join types on types.id=goods.typeid where types.typename like '%"+type+"%' ";return db.getList(sql);}public int addGood(Good good) {// 带占位符的sql语句String sql = "insert into goods(gname,price,image,typeid,uid,info) values(?,?,?,?,?,?)";String[] params = new String[]{good.getGname(),good.getPrice(),good.getImage(),good.getTypeid(),good.getUid(),good.getInfo()};// 得到预编译的语句对象return db.update(sql, params);}public int delGood(String id) {String sql = "delete from goods where id=?";String[] params= {id};return db.update(sql,params);}public int update(Good good) {String sql= "update goods set gname=?,price=?,image=?,typeid=? where id=?";String[] params= {good.getGname(),good.getPrice(),good.getImage(),good.getTypeid(),String.valueOf(good.getId())};    return db.update(sql,params);}public  Good getGoodById(String id){String sql = "select goods.id id,goods.gname gname,goods.price price ,goods.info info,goods.uid uid,types.typename typename,goods.image image from goods inner join types on types.id=goods.typeid where goods.id=?  order by id";String[] params = {id};Map<String,String> g=db.getMap(sql, params);Good good=new Good();if(g!=null){good.setId(Integer.valueOf(id));good.setGname(g.get("gname"));good.setImage(g.get("image"));good.setPrice(g.get("price"));good.setInfo(g.get("info"));good.setUid(g.get("uid"));good.setTypename(g.get("typename"));}else{good=null;}return good;}
}

前端显示所有商品

<c:forEach items="${requestScope.goods.list }" var="good"><tr><td style="width:80px;height:70px"><img src="${basePath}/${good.image }" style="width:60px;height:50px"></td><td>${good.gname }</td><td>${good.price }元</td><td>${good.typename }</td><td><a href="${basePath}/GoodGetById?id=${good.id }"><button type="button" class="btn btn-success">编辑</button></a><a href="${basePath}/GoodDelServlet?id=${good.id }"><button type="button" class="btn btn-danger">删除</button></a></td></tr></c:forEach>

以下是项目界面展示

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JavaWeb图书商城网上书城

前言

数据库设计

项目目录：

工具类

Controller控制器（servlet)

以下是项目界面展示

JavaWeb图书商城网上书城相关推荐

最新文章

热门文章

JavaWeb图书商城 网上书城

前言

数据库设计

项目目录：

工具类

Controller控制器（servlet)

以下是项目界面展示

JavaWeb图书商城 网上书城相关推荐

最新文章

热门文章

JavaWeb图书商城网上书城

JavaWeb图书商城网上书城相关推荐