12-13 库存信息管理系统
1.首先是建立 商品类 与上一周的课程管理体统类似
package com.hjf.entity; public class Course { private int id; private String name; private String shengc; private String xingh; private String guig; private String shul; private String riq; private String shij; private String ruk; private String songh; public String getsongh() { return songh; } public void setsongh(String songh) { this.songh = songh; } public String getruk() { return ruk; } public void setruk(String ruk) { this.ruk = ruk; } public String getshij() { return shij; } public void setshij(String shij) { this.shij = shij; } public String getriq() { return riq; } public void setriq(String riq) { this.riq = riq; } public String getshul() { return shul; } public void setshul(String shul) { this.shul = shul; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getshengc() { return shengc; } public void setshengc(String shengch) { this.shengc = shengch; } public String getxingh() { return xingh; } public void setxingh(String xingh) { this.xingh = xingh; } public String getguig() { return guig; } public void setguig(String guig) { this.guig = guig; } public Course() { // TODO 自动生成的构造函数存根 } public Course(int id, String name, String shengc, String xingh,String guig,String shul,String riq,String shij,String ruk,String songh) { this.id = id; this.name = name; this.shengc = shengc; this.xingh = xingh; this.guig = guig; this.shul = shul; this.riq = riq; this.shij = shij; this.ruk = ruk; this.songh = songh; } public Course(String name, String shengc, String xingh,String guig,String shul,String riq,String shij,String ruk,String songh) { this.name = name; this.shengc = shengc; this.xingh = xingh; this.guig = guig; this.shul = shul; this.riq = riq; this.shij = shij; this.ruk = ruk; this.songh = songh; } }
2.然后是dao层的增删改查
package com.hjf.dao; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import com.hjf.entity.Course; import com.hjf.util.DBUtil; /** * 课程Dao * Dao层操作数据 * @author xie * * */ public class CourseDao { /** * 添加 * @param course * @return */ public boolean add(Course course) { String sql = "insert into course(name, shengc, xingh,guig,shul,riq,shij,ruk,songh) values('" + course.getName() + "','" + course.getshengc() + "','" + course.getxingh() + "','" + course.getguig()+ "','" + course.getshul() + "','" + course.getriq()+ "','" + course.getshij()+ "','" + course.getruk()+ "','" + course.getsongh() + "')"; Connection conn = DBUtil.getConn(); Statement state = null; boolean f = false; int a = 0; try { state = conn.createStatement(); state.executeUpdate(sql); } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * 删除 * * @param id * @return */ public boolean delete (int id) { boolean f = false; String sql = "delete from course where id='" + id + "'"; Connection conn = DBUtil.getConn(); Statement state = null; int a = 0; try { state = conn.createStatement(); a = state.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * 修改 * @param name * @param pass */ public boolean update(Course course) { String sql = "update course set name='" + course.getName() + "', shengc='" + course.getshengc() + "', xingh='" + course.getxingh()+"',guig='" + course.getguig()+"',shul='" + course.getshul()+"',riq='" + course.getriq() +"',shij='" + course.getshij()+"',ruk='" + course.getruk()+"',songh='" + course.getsongh() + "' where id='" + course.getId() + "'"; Connection conn = DBUtil.getConn(); Statement state = null; boolean f = false; int a = 0; try { state = conn.createStatement(); a = state.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * @param name * @return */ public boolean name(String name) { boolean flag = false; String sql = "select name from course where name = '" + name + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { flag = true; } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return flag; } /** * 通过ID得到类 * @param id * @return */ public Course getCourseById(int id) { String sql = "select * from course where id ='" + id + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; Course course = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { String name = rs.getString("name"); String shengc = rs.getString("shengc"); String xingh = rs.getString("xingh"); String guig = rs.getString("guig"); String shul = rs.getString("shul"); String riq = rs.getString("riq"); String shij = rs.getString("shij"); String ruk = rs.getString("ruk"); String songh = rs.getString("songh"); course = new Course(id, name, shengc,xingh,guig,shul,riq,shij,ruk,songh); } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return course; } /** * 通过name得到Course * @param name * @return */ public Course getCourseByName(String name) { String sql = "select * from course where name ='" + name + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; Course course = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { int id = rs.getInt("id"); String shengc = rs.getString("shengc"); String xingh = rs.getString("xingh"); String guig = rs.getString("guig"); String shul = rs.getString("shul"); String riq = rs.getString("riq"); String shij = rs.getString("shij"); String ruk = rs.getString("ruk"); String songh = rs.getString("songh"); course = new Course(id, name, shengc,xingh,guig,shul,riq,shij,ruk,songh); } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return course; } /** * 查找 */ public List<Course> search(String name, String riq,String songh) { String sql = "select * from course where 1=1 "; if (name != "") { sql += "and name like '%" + name + "%'"; } if (riq != "") { sql += "and riq like '%" + riq+ "%'"; } if (songh != "") { sql += "and songh like '%" + songh+ "%'"; } List<Course> list = new ArrayList<>(); Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); Course bean = null; while (rs.next()) { int id = rs.getInt("id"); String name2 = rs.getString("name"); String shengc2 = rs.getString("shengc"); String xingh2 = rs.getString("xingh"); String guig2 = rs.getString("guig"); String shul2 = rs.getString("shul"); String riq2 = rs.getString("riq"); String shij2 = rs.getString("shij"); String ruk2 = rs.getString("ruk"); String songh2 = rs.getString("songh"); bean = new Course(id, name2, shengc2,xingh2,guig2,shul2,riq2,shij2,ruk2,songh2); list.add(bean); } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return list; } /** * 全部数据 */ public List<Course> list() { String sql = "select * from course"; List<Course> list = new ArrayList<>(); Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); Course bean = null; while (rs.next()) { int id = rs.getInt("id"); String name2 = rs.getString("name"); String shengc2 = rs.getString("shengc"); String xingh2 = rs.getString("xingh"); String guig2 = rs.getString("guig"); String shul2 = rs.getString("shul"); String riq2 = rs.getString("riq"); String shij2 = rs.getString("shij"); String ruk2 = rs.getString("ruk"); String songh2 = rs.getString("songh"); bean = new Course(id, name2, shengc2,xingh2,guig2,shul2,riq2,shij2,ruk2,songh2); list.add(bean); } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return list; } }
3.service接口
package com.hjf.service; import java.util.List; import com.hjf.dao.CourseDao; import com.hjf.entity.Course; /** * CourseService * 服务层 * @author Hu * */ public class CourseService { CourseDao cDao = new CourseDao(); /** * 添加 * @param course * @return */ public boolean add(Course course) { boolean f = false; if(!cDao.name(course.getName())) { cDao.add(course); f = true; } return f; } /** * 删除 */ public void del(int id) { cDao.delete(id); } /** * 修改 * @return */ public void update(Course course) { cDao.update(course); } /** * 通过ID得到一个Course * @return */ public Course getCourseById(int id) { return cDao.getCourseById(id); } /** * 通过Name得到一个Course * @return */ public Course getCourseByName(String name) { return cDao.getCourseByName(name); } /** * 查找 * @return */ public List<Course> search(String name,String riq,String songh) { return cDao.search( name,riq,songh); } /** * 全部数据 * @return */ public List<Course> list() { return cDao.list(); } }
4.severlet 层 不用更改
package com.hjf.servlet; import java.io.IOException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.hjf.entity.Course; import com.hjf.service.CourseService; @WebServlet("/CourseServlet") public class CourseServlet extends HttpServlet { private static final long serialVersionUID = 1L; CourseService service = new CourseService(); /** * 方法选择 */ protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); String method = req.getParameter("method"); if ("add".equals(method)) { add(req, resp); } else if ("del".equals(method)) { del(req, resp); } else if ("update".equals(method)) { update(req, resp); } else if ("search".equals(method)) { search(req, resp); } else if ("getcoursebyid".equals(method)) { getCourseById(req, resp); } else if ("getcoursebyname".equals(method)) { getCourseByName(req, resp); } else if ("list".equals(method)) { list(req, resp); } } /** * 添加 * @param req * @param resp * @throws IOException * @throws ServletException */ private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); String shengc = req.getParameter("shengc"); String xingh = req.getParameter("xingh"); String guig = req.getParameter("guig"); String shul = req.getParameter("shul"); String riq = req.getParameter("riq"); String shij = req.getParameter("shij"); String ruk = req.getParameter("ruk"); String songh = req.getParameter("songh"); Course course = new Course( name, shengc,xingh,guig,shul,riq,shij,ruk,songh); //添加后消息显示 if(service.add(course)) { req.setAttribute("message", "添加成功"); req.getRequestDispatcher("add.jsp").forward(req,resp); } else { req.setAttribute("message", "商品名称重复，请重新录入"); req.getRequestDispatcher("add.jsp").forward(req,resp); } } /** * 全部 * @param req * @param resp * @throws ServletException */ private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); List<Course> courses = service.list(); req.setAttribute("courses", courses); req.getRequestDispatcher("list.jsp").forward(req,resp); } /** * 通过ID得到Course * @param req * @param resp * @throws ServletException */ private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); Course course = service.getCourseById(id); req.setAttribute("course", course); req.getRequestDispatcher("detail2.jsp").forward(req,resp); } /** * 通过名字查找 * 跳转至删除 * @param req * @param resp * @throws IOException * @throws ServletException */ private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); Course course = service.getCourseByName(name); if(course == null) { req.setAttribute("message", "查无此商品！"); req.getRequestDispatcher("del.jsp").forward(req,resp); } else { req.setAttribute("course", course); req.getRequestDispatcher("detail.jsp").forward(req,resp); } } /** * 删除 * @param req * @param resp * @throws IOException * @throws ServletException */ private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); service.del(id); req.setAttribute("message", "删除成功！"); req.getRequestDispatcher("del.jsp").forward(req,resp); } /** * 修改 * @param req * @param resp * @throws IOException * @throws ServletException */ private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); String name = req.getParameter("name"); String shengc = req.getParameter("shengc"); String xingh = req.getParameter("xingh"); String guig = req.getParameter("guig"); String shul = req.getParameter("shul"); String riq = req.getParameter("riq"); String shij = req.getParameter("shij"); String ruk = req.getParameter("ruk"); String songh = req.getParameter("songh"); Course course = new Course(id, name, shengc,xingh,guig,shul,riq,shij,ruk,songh); service.update(course); req.setAttribute("message", "修改成功"); req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp); } /** * 查找 * @param req * @param resp * @throws ServletException */ private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); String riq = req.getParameter("riq"); String songh = req.getParameter("songh"); List<Course> courses = service.search( name, riq,songh); req.setAttribute("courses", courses); req.getRequestDispatcher("searchlist.jsp").forward(req,resp); } }
5.数据可的连接
package com.hjf.util; //数据库连接 import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; /** * 数据库连接工具 * @author Zheng * */ public class DBUtil { public static String db_url = "jdbc:mysql://localhost:3306/course?useSSL=false"; public static String db_user = "root"; public static String db_pass = "root"; public static Connection getConn () { Connection conn = null; try { Class.forName("com.mysql.jdbc.Driver");//加载驱动 conn = DriverManager.getConnection(db_url, db_user, db_pass); } catch (Exception e) { e.printStackTrace(); } return conn; } /** * 关闭连接 * @param state * @param conn */ public static void close (Statement state, Connection conn) { if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close (ResultSet rs, Statement state, Connection conn) { if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }
数据库的建立
到这里 Java的代码就完成了
下面是网页界面 的代码
1首先是主界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>首页</title> <style> .a{ font-size: 26px; margin-top: 20px; } </style> </head> <body> <div align="center"> <h1 style="color: red;">库存信息管理系统</h1> <div class="a"> <a href="add.jsp">商品信息录入</a> </div> <div class="a"> <a href="CourseServlet?method=list">商品信息修改</a> </div> <div class="a"> <a href="del.jsp">商品信息删除</a> </div> <div class="a"> <a href="search.jsp">商品信息查询</a> </div> </div> </body> </html>
2.增加界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">商品入库</h1> <a href="index.jsp">返回主页</a> <form action="CourseServlet?method=add" method="post" onsubmit="return check()"> <div class="a"> 商品名称<input type="text" id="name" name="name"/> </div> <div class="a"> 生产厂家<input type="text" id="shengc" name="shengc" /> </div> <div class="a"> 型号<input type="text" id="xingh" name="xingh" /> </div> <div class="a"> 规格<input type="text" id="guig" name="guig" /> </div> <div class="a"> 数量<input type="text" id="shul" name="shul" /> </div> <div class="a"> 日期<input type="text" id="riq" name="riq" /> </div> <div class="a"> 时间<input type="text" id="shij" name="shij" /> </div> <div class="a"> 入库单位<input type="text" id="ruk" name="ruk" /> </div> <div class="a"> 送货人<input type="text" id="songh" name="songh" /> </div> <div class="a"> <button type="submit" class="b">保 存</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var shengc = document.getElementById("shengc"); var xingh = document.getElementById("xingh"); var guig=document.getElementById("guig"); var shul=document.getElementById("shul"); var riq=document.getElementById("riq"); var ruk=document.getElementById("ruk"); var songh=document.getElementById("songh") //非空 if(name.value == '') { alert('商品名称为空'); name.focus(); return false; } if(shengc.value == '') { alert('生产场地为空'); shengc.focus(); return false; } if(xingh.value == '') { alert('型号为空'); xingh.focus(); return false; } if(guig.value == '') { alert('规格为空'); guig.focus(); return false; } if(shul.value == '') { alert('shul为空'); shul.focus(); return false; } if(riq.value == '') { alert('上课地点为空'); riq.focus(); return false; } if(shij.value == '') { alert('课程名称为空'); shij.focus(); return false; } if(ruk.value == '') { alert('教师为空'); ruk.focus(); return false; } if(songh.value == '') { alert('上课地点为空'); songh.focus(); return false; } } </script> </body> </html>
3.删除界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">商品信息删除</h1> <a href="index.jsp">返回主页</a> <form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()"> <div class="a"> 商品名称<input type="text" id="name" name="name"/> </div> <div class="a"> <button type="submit" class="b">查 找</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; //非空 if(name.value == '') { alert('商品名称为空'); name.focus(); return false; } } </script> </body> </html>
删除前的显示界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">商品信息删除</h1> <a href="index.jsp">返回主页</a> <form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()"> <div class="a"> 商品名称<input type="text" id="name" name="name"/> </div> <div class="a"> <button type="submit" class="b">查 找</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; //非空 if(name.value == '') { alert('商品名称为空'); name.focus(); return false; } } </script> </body> </html>
修改界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">商品信息修改</h1> <a href="index.jsp">返回主页</a> <form action="CourseServlet?method=update" method="post" onsubmit="return check()"> <div class="a"> 商品名称<input type="text" id="name" name="name" value="${course.name}"/> </div> <div class="a"> 生产商家<input type="text" id="shengc" name="shengc" value="${course.shengc}"/> </div> <div class="a"> 型号<input type="text" id="xingh" name="xingh" value="${course.xingh}"/> </div> <div class="a"> 规格<input type="text" id="guig" name="guig" value="${course.guig}"/> </div> <div class="a"> 数量<input type="text" id="shul" name="shul" value="${course.shul}"/> </div> <div class="a"> 日期<input type="text" id="riq" name="riq" value="${course.riq}"/> </div> <div class="a"> 时间<input type="text" id="shij" name="shij" value="${course.shij}"/> </div> <div class="a"> 入库单为<input type="text" id="ruk" name="ruk" value="${course.ruk}"/> </div> <div class="a"> 送货人<input type="text" id="songh" name="songh" value="${course.songh}"/> </div> <input type="hidden" id="id" name="id" value="${course.id}"/> <div class="a"> <button type="submit" class="b">修 改</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var shengc = document.getElementById("shengc"); var xingh = document.getElementById("xingh"); var guig=document.getElementById("guig"); var shul=document.getElementById("shul"); var riq=document.getElementById("riq"); var ruk=document.getElementById("ruk"); var songh=document.getElementById("songh") } </script> </body> </html>
显示界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } .tb, td { border: 1px solid black; font-size: 22px; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">商品信息列表</h1> <a href="index.jsp">返回主页</a> <table class="tb"> <tr> <td>id</td> <td>商品名称</td> <td>型号</td> <td>规格</td> <td>数量</td> <td>日期</td> <td>时间</td> <td>入库单位</td> <td>送货人</td> <td align="center" colspan="2">操作</td> </tr> <c:forEach items="${courses}" var="item"> <tr> <td>${item.id}</td> <td>${item.name}</td> <td>${item.xingh}</td> <td>${item.guig}</td> <td>${item.riq}</td> <td>${item.shij}</td> <td>${item.ruk}</td> <td>${item.songh}</td> <td><a href="CourseServlet?method=getcoursebyid&id=${item.id}">修改</a></td> </tr> </c:forEach> </table> </div> </body> </html>
搜索 检索 模糊搜索加二面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <div align="center"> <h1 style="color: red;">商品信息查询</h1> <a href="index.jsp">返回主页</a> <form action="CourseServlet?method=search" method="post" onsubmit="return check()"> <div class="a"> 商品名称<input type="text" id="name" name="name"/> </div> <div class="a"> 日期<input type="text" id="riq" name="riq" /> </div> <div class="a"> 送货人<input type="text" id="songh" name="songh" /> </div> <div class="a"> <button type="submit" class="b">查 询</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var riq = document.getElementById("riq"); var songh = document.getElementById("songh"); //非空 if(name.value == '' && riq.value == '' && songh.value == '') { alert('请填写一个条件'); return false; } } </script> </body> </html>
检索成功界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } .tb, td { border: 1px solid black; font-size: 22px; } </style> </head> <body> <div align="center"> <h1 style="color: red;">课程信息列表</h1> <a href="index.jsp">返回主页</a> <table class="tb"> <tr> <td>id</td> <td>商品名称</td> <td>生产厂家</td> <td>型号</td> <td>规格</td> <td>数量</td> <td>日期</td> <td>时间</td> <td>入库单位</td> <td>送货人</td> </tr> <!-- forEach遍历出adminBeans --> <c:forEach items="${courses}" var="item" varStatus="status"> <tr> <td>${item.id}</td> <td><a>${item.name}</a></td> <td>${item.shengc}</td> <td>${item.xingh}</td> <td>${item.guig}</td> <td>${item.shul}</td> <td><a>${item.riq}</a></td> <td>${item.shij}</td> <td>${item.ruk}</td> <td><a>${item.songh}</a></td> </tr> </c:forEach> </table> </div> </body> </html>
数据库的增删该查要每个方法都连接上数据库
连接上数据库 每次的 类中的变量 都要准确同一 错一处就很难找出来 还会报错 ；
