仓库管理系统

建两张数据表，一张用来商品的增删改查，一张记录商品的出库与入库信息

建两个实体类，用来传递商品与单据的信息

在添加与删除时，填写入库或者出库单据，入库时增加商品，出库时删除商品。course类写商品的增删改查，另一个dao类只写单据的添加，自后将两张表连接起来

//course.dao
package com.hjf.entity;

public class Course {

    private int id;
    private String name;
    private String sname;
    private String xinghao;
    private String size;
    
    
    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 getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getXinghao() {
        return xinghao;
    }

    public void setXinghao(String shape) {
        this.xinghao = shape;
    }

    public String getSize() {
        return size;
    }

    public void setSize(String size) {
        this.size = size;
    }

    public Course() {}
    
    public Course(int id, String name, String sname, String xinghao, String size) {
        this.id = id;
        this.name = name;
        this.sname =sname;
        this.xinghao = xinghao;
        this.size=size;
    }
    
    public Course(String name, String sname, String xinghao, String size) {
        this.name = name;
        this.sname =sname;
        this.xinghao = xinghao;
        this.size=size;
    }

}

//danju.java
package com.hjf.entity;

public class danju {
    private int id;
    private String name;
    private String sname;
    private String xinghao;
    private String size;
    private String pname;
    private String rname;
    private int number;
    private String riqi;
    private String shijian;
    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 getSname() {
        return sname;
    }
    public void setSname(String sname) {
        this.sname = sname;
    }
    public String getXinghao() {
        return xinghao;
    }
    public void setXinghao(String xinghao) {
        this.xinghao = xinghao;
    }
    public String getSize() {
        return size;
    }
    public void setSize(String size) {
        this.size = size;
    }
    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }
    public String getRiqi() {
        return riqi;
    }
    public void setRiqi(String riqi) {
        this.riqi = riqi;
    }
    public String getShijian() {
        return shijian;
    }
    public void setShijian(String shijian) {
        this.shijian = shijian;
    }
    public String getPname() {
        return pname;
    }
    public void setPname(String pname) {
        this.pname = pname;
    }
    public String getRname() {
        return rname;
    }
    public void setRname(String rname) {
        this.rname = rname;
    }
    public danju(int id, String name, String sname, String xinghao, String size,int number,String riqi,String shijian,String rname,String pname) {
        this.id = id;
        this.name = name;
        this.sname =sname;
        this.xinghao = xinghao;
        this.size=size;
        this.number=number;
        this.riqi=riqi;
        this.shijian=shijian;
        this.rname=rname;
        this.pname=pname;
    }
    public danju( String name, String sname, String xinghao, String size,int number,String riqi,String shijian,String rname,String pname) {
        
        this.name = name;
        this.sname =sname;
        this.xinghao = xinghao;
        this.size=size;
        this.number=number;
        this.riqi=riqi;
        this.shijian=shijian;
        this.rname=rname;
        this.pname=pname;
    }
    
    

}

//course.dao
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.entity.danju;
import com.hjf.util.DBUtil;

/**
 * 课程Dao
 * Dao层操作数据
 * @author Hu
 *
 */
public class CourseDao {

    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(Course course,danju danju1) {
        String sql = "insert into course(name, sname, xinghao,size) values('" + course.getName() + "','" + course.getSname() + "','" + course.getXinghao() + "','" + course.getSize() + "')";
        String sql1 = "insert into danju(name, sname, xinghao,size,number,riqi,shijian,rname,pname) values('" + danju1.getName() + "','" + danju1.getSname() + "','" + danju1.getXinghao() + "','" + danju1.getSize() + "','" + danju1.getNumber() + "','" + danju1.getRiqi() + "','" + danju1.getShijian() + "','" + danju1.getRname() + "','" + danju1.getPname() + "')";
        //创建数据库链接
        Connection conn = DBUtil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;
        
        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
            state.executeUpdate(sql1);
            
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //关闭连接
            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() + "', sname='" + course.getSname() + "', xinghao='" + course.getXinghao()+ "', size='" + course.getSize()
            + "' 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;
    }
    
    /**
     * 验证课程名称是否唯一
     * true --- 不唯一
     * @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得到课程信息
     * @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 sname = rs.getString("sname");
                String xinghao = rs.getString("xinghao");
                String size = rs.getString("size");
                course = new Course(id, name, sname, xinghao,size);
            }
        } 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 sname = rs.getString("sname");
                String xinghao = rs.getString("xinghao");
                String size = rs.getString("size");
                course = new Course(id, name, sname, xinghao,size);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }
        
        return course;
    }
    
    /**
     * 查找
     * @param name
     * @param teacher
     * @param classroom
     * @return
     */
    public List<danju> search(String name) {
        String sql = "select * from jilu where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        List<danju> list = new ArrayList<>();
        Connection conn = DBUtil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            danju bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                int number = rs.getInt("number");
                String name2 = rs.getString("name");
                String sname = rs.getString("sname");
                String xinghao = rs.getString("xinghao");
                String size = rs.getString("size");
                String rname = rs.getString("rname");
                String pname = rs.getString("pname");
                String riqi = rs.getString("riqi");
                String shijian = rs.getString("shijian");
                bean = new danju(id,name2,sname,xinghao,size,number,riqi,shijian,rname,pname);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }
        
        return list;
    }
    
    /**
     * 全部数据
     * @param name
     * @param sname
     * @param xinghao
     * @param size
     * @return
     */
    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 name = rs.getString("name");
                String sname = rs.getString("sname");
                String xinghao = rs.getString("xinghao");
                String size = rs.getString("size");
                bean = new Course(id, name,sname,xinghao,size);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(rs, state, conn);
        }
        
        return list;
    }

}

//courseservlet
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.entity.danju;
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 {
        resp.setContentType("text/html;charset=utf-8");
        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 {
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        //获取数据
        String name = req.getParameter("name");
        String sname = req.getParameter("sname");
        String xinghao = req.getParameter("xinghao");
        String size = req.getParameter("size");
        int number = Integer.parseInt(req.getParameter("number"));
        String riqi = req.getParameter("riqi");
        String shijian = req.getParameter("shijian");
        String rname = req.getParameter("rname");
        String pname = req.getParameter("pname");
        Course course = new Course(name, sname, xinghao,size);
        danju danju1=new danju( name,sname,xinghao,size,number,riqi,shijian,rname,pname);
        //添加后消息显示
        if(service.add(course,danju1)) {
            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");
        resp.setContentType("text/html;charset=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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        String name = req.getParameter("name");
        String sname = req.getParameter("sname");
        String xinghao = req.getParameter("xinghao");
        String size = req.getParameter("size");
        Course course = new Course(id, name, sname, xinghao,size);
        
        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{
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        List<danju> danju1 = service.search(name);
        req.setAttribute("daju1", danju1);
        req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
    }
}

//DBU.java
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.entity.danju;
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 {
        resp.setContentType("text/html;charset=utf-8");
        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 {
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        //获取数据
        String name = req.getParameter("name");
        String sname = req.getParameter("sname");
        String xinghao = req.getParameter("xinghao");
        String size = req.getParameter("size");
        int number = Integer.parseInt(req.getParameter("number"));
        String riqi = req.getParameter("riqi");
        String shijian = req.getParameter("shijian");
        String rname = req.getParameter("rname");
        String pname = req.getParameter("pname");
        Course course = new Course(name, sname, xinghao,size);
        danju danju1=new danju( name,sname,xinghao,size,number,riqi,shijian,rname,pname);
        //添加后消息显示
        if(service.add(course,danju1)) {
            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");
        resp.setContentType("text/html;charset=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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        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{
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        String name = req.getParameter("name");
        String sname = req.getParameter("sname");
        String xinghao = req.getParameter("xinghao");
        String size = req.getParameter("size");
        Course course = new Course(id, name, sname, xinghao,size);
        
        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{
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        List<danju> danju1 = service.search(name);
        req.setAttribute("daju1", danju1);
        req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
    }
}

//add.jsp
<%@ 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>

</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: black;">商品单据信息录入</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="sname" name="sname" />
            </div>
            <div class="a">
                型号<input type="text" id="xinghao" name="xinghao" />
            </div>
            <div class="a">
                规格<input type="text" id="size" name="size" />
            </div>
            <div class="a">
                数量<input type="text" id="number" name="number" />
            </div>
            <div class="a">
                日期<input type="text" id="riqi" name="riqi" />
            </div>
            <div class="a">
                时间<input type="text" id="shijian" name="shijian" />
            </div>
            <div class="a">
                单位<input type="text" id="rname" name="rname" />
            </div>
            <div class="a">
                姓名<input type="text" id="pname" name="pname" />
            </div>
            <div class="a">
                <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</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>

<%@ 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>

</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: black;">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&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('课程名称为空');
                name.focus();
                return false;
            }
        }
    </script>
</body>
</html>

<%@ 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;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: black;">课程信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>商品名称</td>
                <td>${course.name}</td>
            </tr>
            <tr>
                <td>出产厂家</td>
                <td>${course.sname}</td>
            </tr>
            <tr>
                <td>型号</td>
                <td>${course.xinghao}</td>
            </tr>
            <tr>
                <td>规格</td>
                <td>${course.size}</td>
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="CourseServlet?method=del&id=${course.id}" >删&nbsp;&nbsp;&nbsp;除</a>
        </div>
    </div>
    <script type="text/javascript">
        function check() {
            if (confirm("真的要删除吗？")){
                return true;
            }else{
                return false;
            }
        }
    </script>
</body>
</html>