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" οnsubmit="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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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" οnsubmit="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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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" οnsubmit="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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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" οnsubmit="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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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" οnsubmit="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&nbsp;&nbsp;&nbsp;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；

转载于:https://www.cnblogs.com/1983185414xpl/p/10116741.html

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