zoukankan html css js c++ java

仓库管理msi系统

实验思路：

建表：

代码：

 1 package com.hjf.util;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.sql.Statement;
 8 
 9 /**
10  * 鏁版嵁搴撹繛鎺ュ伐鍏�
11  * @author Hu
12  *
13  */
14 public class DBUtil {
15     
16     public static String db_url = "jdbc:mysql://localhost:3306/ware?useSSL=false&useUnicode=true&characterEncoding=UTF-8";
17     public static String db_user = "root";
18     public static String db_pass = "15568958907lx";
19     
20     public static Connection getConn () {
21         Connection conn = null;
22         
23         try {
24             Class.forName("com.mysql.jdbc.Driver");//鍔犺浇椹卞姩
25             conn = DriverManager.getConnection(db_url, db_user, db_pass);
26         } catch (Exception e) {
27             e.printStackTrace();
28         }
29         
30         return conn;
31     }
32     
33     /**
34      * 鍏抽棴杩炴帴
35      * @param state
36      * @param conn
37      */
38     public static void close (Statement state, Connection conn) {
39         if (state != null) {
40             try {
41                 state.close();
42             } catch (SQLException e) {
43                 e.printStackTrace();
44             }
45         }
46         
47         if (conn != null) {
48             try {
49                 conn.close();
50             } catch (SQLException e) {
51                 e.printStackTrace();
52             }
53         }
54     }
55     
56     public static void close (ResultSet rs, Statement state, Connection conn) {
57         if (rs != null) {
58             try {
59                 rs.close();
60             } catch (SQLException e) {
61                 e.printStackTrace();
62             }
63         }
64         
65         if (state != null) {
66             try {
67                 state.close();
68             } catch (SQLException e) {
69                 e.printStackTrace();
70             }
71         }
72         
73         if (conn != null) {
74             try {
75                 conn.close();
76             } catch (SQLException e) {
77                 e.printStackTrace();
78             }
79         }
80     }
81 
82 }

  1 package com.hjf.servlet;
  2 
  3 import java.io.IOException;
  4 import java.util.List;
  5 
  6 import javax.servlet.ServletException;
  7 import javax.servlet.annotation.WebServlet;
  8 import javax.servlet.http.HttpServlet;
  9 import javax.servlet.http.HttpServletRequest;
 10 import javax.servlet.http.HttpServletResponse;
 11 
 12 import com.hjf.dao.CourseDao;
 13 import com.hjf.entity.Course;
 14 import com.hjf.service.CourseService;
 15 
 16 @WebServlet("/CourseServlet")
 17 public class CourseServlet extends HttpServlet {
 18     
 19     private static final long serialVersionUID = 1L;
 20 
 21     CourseDao dao = new CourseDao();
 22     
 23     /**
 24      * 方法选择
 25      */
 26     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 27         req.setCharacterEncoding("utf-8");
 28         String method = req.getParameter("method");
 29         
 30         if ("add".equals(method)) {
 31             add(req, resp);
 32         } else if ("del".equals(method)) {
 33             del(req, resp);
 34         } else if ("update".equals(method)) {
 35             update(req, resp);
 36         } else if ("search".equals(method)) {
 37             search(req, resp);
 38         } else if ("getcoursebyid".equals(method)) {
 39             getCourseById(req, resp);
 40         } else if ("getcoursebyname".equals(method)) {
 41             getCourseByName(req, resp);
 42         } else if ("list".equals(method)) {
 43             list(req, resp);
 44         }
 45     }
 46 
 47     /**
 48      * 添加
 49      * @param req
 50      * @param resp
 51      * @throws IOException 
 52      * @throws ServletException 
 53      */
 54     private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
 55         req.setCharacterEncoding("utf-8");
 56         //获取数据
 57         String name = req.getParameter("name");
 58         String factory = req.getParameter("factory");
 59         String model = req.getParameter("model");
 60         String spec = req.getParameter("spec");
 61         Course course = new Course(name, factory, model,spec);
 62         
 63         //添加后消息显示
 64         if(dao.add(course)) {
 65             req.setAttribute("message", "添加成功");
 66             req.getRequestDispatcher("add.jsp").forward(req,resp);
 67         } else {
 68             req.setAttribute("message", "名称重复，请重新录入");
 69             req.getRequestDispatcher("add.jsp").forward(req,resp);
 70         }
 71     }
 72     
 73     /**
 74      * 全部
 75      * @param req
 76      * @param resp
 77      * @throws ServletException 
 78      */
 79     private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
 80         req.setCharacterEncoding("utf-8");
 81         
 82         List<Course> courses = dao.list();
 83         req.setAttribute("courses", courses);
 84         req.getRequestDispatcher("list.jsp").forward(req,resp);
 85     }
 86 
 87     /**
 88      * 通过ID得到Course
 89      * @param req
 90      * @param resp
 91      * @throws ServletException 
 92      */
 93     private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
 94         req.setCharacterEncoding("utf-8");
 95         int id = Integer.parseInt(req.getParameter("id"));
 96         Course course = dao.getCourseById(id);
 97         req.setAttribute("course", course);
 98         req.getRequestDispatcher("detail2.jsp").forward(req,resp);
 99     }
100 
101     /**
102      * 通过名字查找
103      * 跳转至删除
104      * @param req
105      * @param resp
106      * @throws IOException
107      * @throws ServletException 
108      */
109     private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
110         req.setCharacterEncoding("utf-8");
111         String name = req.getParameter("name");
112         Course course = dao.getCourseByName(name);
113         if(course == null) {
114             req.setAttribute("message", "查无此课程！");
115             req.getRequestDispatcher("del.jsp").forward(req,resp);
116         } else {
117             req.setAttribute("course", course);
118             req.getRequestDispatcher("detail.jsp").forward(req,resp);
119         }
120     }
121     
122     /**
123      * 删除
124      * @param req
125      * @param resp
126      * @throws IOException
127      * @throws ServletException 
128      */
129     private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
130         req.setCharacterEncoding("utf-8");
131         int id = Integer.parseInt(req.getParameter("id"));
132         dao.delete(id);
133         req.setAttribute("message", "删除成功！");
134         req.getRequestDispatcher("del.jsp").forward(req,resp);
135     }
136     
137     /**
138      * 修改
139      * @param req
140      * @param resp
141      * @throws IOException
142      * @throws ServletException 
143      */
144     private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
145         req.setCharacterEncoding("utf-8");
146         int id = Integer.parseInt(req.getParameter("id"));
147         String name = req.getParameter("name");
148         String factory = req.getParameter("factory");
149         String model = req.getParameter("model");
150         String spec = req.getParameter("spec");
151         Course course = new Course(id, name, factory, model,spec);
152         
153         dao.update(course);
154         req.setAttribute("message", "修改成功");
155         req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
156     }
157     
158     /**
159      * 查找
160      * @param req
161      * @param resp
162      * @throws ServletException 
163      */
164     private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
165         req.setCharacterEncoding("utf-8");
166         String name = req.getParameter("name");
167         String factory = req.getParameter("factory");
168         String model = req.getParameter("model");
169         String spec = req.getParameter("spec");
170         List<Course> courses = dao.search(name, factory, model,spec);
171         req.setAttribute("courses", courses);
172         req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
173     }
174 }

 1 package com.hjf.entity;
 2 
 3 public class Course {
 4 
 5     private int id;
 6     private String name;
 7     private String factory;
 8     private String model;
 9     private String spec;    
10     public int getId() {
11         return id;
12     }
13     public void setId(int id) {
14         this.id = id;
15     }
16     public String getName() {
17         return name;
18     }
19     public void setName(String name) {
20         this.name = name;
21     }
22     public String getfactory() {
23         return factory;
24     }
25     public void setTeacher(String factory) {
26         this.factory = factory;
27     }
28     public String getmodel() {
29         return model;
30     }
31     public void setClassroom(String model) {
32         this.model = model;
33     }
34     public void setspec(String spec){
35         this.spec=spec;
36     }    
37     public String getspec(){
38         return spec;
39     }    
40     public Course() {}
41     
42     public Course(int id, String name, String teacher, String classroom,String spec) {
43         this.id = id;
44         this.name = name;
45         this.factory = factory;
46         this.model = model;
47         this.spec=spec;
48     }
49     
50     public Course(String name, String teacher, String classroom,String spec) {
51         this.name = name;
52         this.factory = factory;
53         this.model = model;
54         this.spec=spec;
55     }
56 }

  1 package com.hjf.dao;
  2 
  3 import java.sql.Connection;
  4 
  5 import java.sql.ResultSet;
  6 import java.sql.SQLException;
  7 import java.sql.Statement;
  8 import java.util.ArrayList;
  9 import java.util.List;
 10 
 11 import com.hjf.entity.Course;
 12 import com.hjf.util.DBUtil;
 13 
 14 /**
 15  * 璇剧▼Dao
 16  * Dao灞傛搷浣滄暟鎹�
 17  * @author Hu
 18  *
 19  */
 20 public class CourseDao {
 21 
 22     /**
 23      * 娣诲姞
 24      * @param course
 25      * @return
 26      */
 27     public boolean add(Course course) {
 28         String sql = "insert into ware(name, factory, model ,spec) values('" + course.getName() + "','" + course.getfactory() + "','" + course.getmodel() + "','"+course.getspec() + "')";
 29         Connection conn = DBUtil.getConn();
 30         Statement state = null;
 31         boolean f = false;
 32         int a = 0;
 33         
 34         try {
 35             state = conn.createStatement();
 36             a = state.executeUpdate(sql);
 37         } catch (Exception e) {
 38             e.printStackTrace();
 39         } finally {
 40             DBUtil.close(state, conn);
 41         }
 42         
 43         if (a > 0) {
 44             f = true;
 45         }
 46         return f;
 47     }
 48 
 49     /**
 50      * 鍒犻櫎
 51      * 
 52      * @param id
 53      * @return
 54      */
 55     public boolean delete (int id) {
 56         boolean f = false;
 57         String sql = "delete from ware where id='" + id + "'";
 58         Connection conn = DBUtil.getConn();
 59         Statement state = null;
 60         int a = 0;
 61         
 62         try {
 63             state = conn.createStatement();
 64             a = state.executeUpdate(sql);
 65         } catch (SQLException e) {
 66             e.printStackTrace();
 67         } finally {
 68             DBUtil.close(state, conn);
 69         }
 70         
 71         if (a > 0) {
 72             f = true;
 73         }
 74         return f;
 75     }
 76 
 77     /**
 78      * 淇�敼
 79      * @param name
 80      * @param pass
 81      */
 82     public boolean update(Course course) {
 83         String sql = "update ware set name='" + course.getName() + "',factory='" + course.getfactory() + "', model='" + course.getmodel() + "', spec='" + course.getspec()
 84             + "' where id='" + course.getId() + "'";
 85         Connection conn = DBUtil.getConn();
 86         Statement state = null;
 87         boolean f = false;
 88         int a = 0;
 89 
 90         try {
 91             state = conn.createStatement();
 92             a = state.executeUpdate(sql);
 93         } catch (SQLException e) {
 94             e.printStackTrace();
 95         } finally {
 96             DBUtil.close(state, conn);
 97         }
 98         
 99         if (a > 0) {
100             f = true;
101         }
102         return f;
103     }
104     
105     /**
106      * 楠岃瘉璇剧▼鍚嶇О鏄�惁鍞�竴
107      * true --- 涓嶅敮涓�
108      * @param name
109      * @return
110      */
111     public boolean name(String name) {
112         boolean flag = false;
113         String sql = "select name from ware where name = '" + name + "'";
114         Connection conn = DBUtil.getConn();
115         Statement state = null;
116         ResultSet rs = null;
117         
118         try {
119             state = conn.createStatement();
120             rs = state.executeQuery(sql);
121             while (rs.next()) {
122                 flag = true;
123             }
124         } catch (SQLException e) {
125             e.printStackTrace();
126         } finally {
127             DBUtil.close(rs, state, conn);
128         }
129         return flag;
130     }
131     
132     /**
133      * 閫氳繃ID寰楀埌绫�
134      * @param id
135      * @return
136      */
137     public Course getCourseById(int id) {
138         String sql = "select * from ware where id ='" + id + "'";
139         Connection conn = DBUtil.getConn();
140         Statement state = null;
141         ResultSet rs = null;
142         Course course = null;
143         
144         try {
145             state = conn.createStatement();
146             rs = state.executeQuery(sql);
147             while (rs.next()) {
148                 String name = rs.getString("name");
149                 String factory = rs.getString("factory");
150                 String model = rs.getString("model");
151                 String spec = rs.getString("spec");
152                 course = new Course(id, name, factory, model,spec);
153             }
154         } catch (Exception e) {
155             e.printStackTrace();
156         } finally {
157             DBUtil.close(rs, state, conn);
158         }
159         
160         return course;
161     }
162     
163     /**
164      * 閫氳繃name寰楀埌Course
165      * @param name
166      * @return
167      */
168     public Course getCourseByName(String name) {
169         String sql = "select * from ware where name ='" + name + "'";
170         Connection conn = DBUtil.getConn();
171         Statement state = null;
172         ResultSet rs = null;
173         Course course = null;
174         
175         try {
176             state = conn.createStatement();
177             rs = state.executeQuery(sql);
178             while (rs.next()) {
179                 int id = rs.getInt("id");
180                 String factory = rs.getString("factory");
181                 String model = rs.getString("model");
182                 String spec = rs.getString("spec");
183                 course = new Course(id, name, factory, model,spec);
184             }
185         } catch (Exception e) {
186             e.printStackTrace();
187         } finally {
188             DBUtil.close(rs, state, conn);
189         }
190         
191         return course;
192     }
193     
194     /**
195      * 鏌ユ壘
196      * @param name
197      * @param teacher
198      * @param classroom
199      * @return
200      */
201     public List<Course> search(String name, String factory, String model,String spec) {
202         String sql = "select * from ware where ";
203         if (name != "") {
204             sql += "name like '%" + name + "%'";
205         }
206         if (factory != "") {
207             sql += "factory like '%" + factory + "%'";
208         }
209         if (model != "") {
210             sql += "model like '%" + model + "%'";
211         }
212         if (spec != "") {
213             sql += "spec like '%" + spec + "%'";
214         }
215         List<Course> list = new ArrayList<>();
216         Connection conn = DBUtil.getConn();
217         Statement state = null;
218         ResultSet rs = null;
219 
220         try {
221             state = conn.createStatement();
222             rs = state.executeQuery(sql);
223             Course bean = null;
224             while (rs.next()) {
225                 int id = rs.getInt("id");
226                 String name2 = rs.getString("name");
227                 String factory2 = rs.getString("factory");
228                 String model2 = rs.getString("model");
229                 String spec2 = rs.getString("spec");
230                 bean = new Course(id, name2, factory2, model2,spec2);
231                 list.add(bean);
232             }
233         } catch (SQLException e) {
234             e.printStackTrace();
235         } finally {
236             DBUtil.close(rs, state, conn);
237         }
238         
239         return list;
240     }
241     
242     /**
243      * 鍏ㄩ儴鏁版嵁
244      * @param name
245      * @param teacher
246      * @param classroom
247      * @return
248      */
249     public List<Course> list() {
250         String sql = "select * from ware";
251         List<Course> list = new ArrayList<>();
252         Connection conn = DBUtil.getConn();
253         Statement state = null;
254         ResultSet rs = null;
255 
256         try {
257             state = conn.createStatement();
258             rs = state.executeQuery(sql);
259             Course bean = null;
260             while (rs.next()) {
261                 int id = rs.getInt("id");
262                 String name2 = rs.getString("name");
263                 String factory2 = rs.getString("factory");
264                 String model2 = rs.getString("model");
265                 String spec2 = rs.getString("spec");
266                 bean = new Course(id, name2, factory2, model2,spec2);
267                 list.add(bean);
268             }
269         } catch (SQLException e) {
270             e.printStackTrace();
271         } finally {
272             DBUtil.close(rs, state, conn);
273         }
274         
275         return list;
276     }
277 
278 }

<%@ 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;
    }
</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">
                名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                生产商家<input type="text" id="factory" name="factory" />
            </div>
            <div class="a">
                型号<input type="text" id="model" name="model" />
            </div>
            <div class="a">
                规格<input type="text" id="spec" name="spec"/>
            </div>
            <div class="a">
                <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;&nbsp;存</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            var factory = document.getElementById("factory");
            var model = document.getElementById("model");
            var spec = document.getElementById("spec");
            
            //非空
            if(name.value == '') {
                alert('名称为空');
                name.focus();
                return false;
            }
            if(factory.value == '') {
                alert('生产商家为空');
                factory.focus();
                return false;
            }
            if(model.value == '') {
                alert('型号为空');
                model.focus();
                return false;
            }
            if(spec.value == '') {
                alert('规格为空');
                spec.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;
    }
</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">
                名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                <button type="submit" class="b">查&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('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: red;">商品信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>名称</td>
                <td>${ware.name}</td>
            </tr>
            <tr>
                <td>生产商家</td>
                <td>${ware.factory}</td>
            </tr>
            <tr>
                <td>型号</td>
                <td>${ware.model}</td>
            </tr>
            <tr>
                <td>规格</td>
                <td>${ware.spec}</td>
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="CourseServlet?method=del&id=${ware.id}">删&nbsp;&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>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <%
22          Object message = request.getAttribute("message");
23          if(message!=null && !"".equals(message)){
24      
25     %>
26          <script type="text/javascript">
27               alert("<%=request.getAttribute("message")%>");
28          </script>
29     <%} %>
30     <div align="center">
31         <h1 style="color: red;">商品信息修改</h1>
32         <a href="index.jsp">返回主页</a>
33         <form action="CourseServlet?method=update" method="post" onsubmit="return check()">
34             <div class="a">
35                 名称<input type="text" id="name" name="name" value="${ware.name}"/>
36             </div>
37             <div class="a">
38                 生产商家<input type="text" id="factory" name="factory" value="${ware.factory}"/>
39             </div>
40             <div class="a">
41                 型号<input type="text" id="model" name="model" value="${ware.model}"/>
42             </div>
43             <div class="a">
44                 规格<input type="text" id="spec" name="spec" value="${ware.spec}"/>
45             </div>
46             <input type="hidden" id="id" name="id" value="${ware.id}"/>
47             <div class="a">
48                 <button type="submit" class="b">修&nbsp;&nbsp;&nbsp;&nbsp;改</button>
49             </div>
50         </form>
51     </div>
52     <script type="text/javascript">
53         function check() {
54             var name = document.getElementById("name");;
55             var factory = document.getElementById("factory");
56             var model = document.getElementById("model");
57             var spec = document.getElementById("spec");
58             
59             //非空
60             if(name.value == '') {
61                 alert('名称为空');
62                 name.focus();
63                 return false;
64             }
65             if(factory.value == '') {
66                 alert('生产商家为空');
67                 factory.focus();
68                 return false;
69             }
70             if(model.value == '') {
71                 alert('型号为空');
72                 model.focus();
73                 return false;
74             }
75             if(spec.value == '') {
76                 alert('规格为空');
77                 spec.focus();
78                 return false;
79             }
80             
81             
82         }
83     </script>
84 </body>
85 </html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>首页</title>
 8 <style>
 9     .a{
10         font-size: 26px;
11         margin-top: 20px;
12     }
13 </style>
14 </head>
15 <body>
16     <div align="center">
17         <h1 style="color: red;">商品基本信息管理系统</h1>
18         <div class="a">
19             <a href="add.jsp">商品信息录入</a>
20         </div>
21         <div class="a">
22             <a href="CourseServlet?method=list">商品信息修改</a>
23         </div>
24         <div class="a">
25             <a href="del.jsp">商品信息删除</a>
26         </div>
27         <div class="a">
28             <a href="search.jsp">商品信息查询</a>
29         </div>
30     </div>
31 </body>
32 </html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 4 <!DOCTYPE html>
 5 <html>
 6 <head>
 7 <meta charset="UTF-8">
 8 <title>Insert title here</title>
 9 <style>
10     .a{
11         margin-top: 20px;
12     }
13     .b{
14         font-size: 20px;
15          160px;
16         color: white;
17         background-color: greenyellow;
18     }
19     .tb, td {
20         border: 1px solid black;
21         font-size: 22px;
22     }
23 </style>
24 </head>
25 <body>
26     <%
27          Object message = request.getAttribute("message");
28          if(message!=null && !"".equals(message)){
29      
30     %>
31          <script type="text/javascript">
32               alert("<%=request.getAttribute("message")%>");
33          </script>
34     <%} %>
35     <div align="center">
36         <h1 style="color: red;">商品信息列表</h1>
37         <a href="index.jsp">返回主页</a>
38         <table class="tb">
39             <tr>
40                 <td>id</td>
41                 <td>名称</td>
42                 <td>生产商家</td>
43                 <td>型号</td>
44                 <td>规格</td>
45                 <td align="center" colspan="2">操作</td>
46             </tr>
47             <c:forEach items="${wares}" var="item">
48                 <tr>
49                     <td>${item.id}</td>
50                     <td>${item.name}</td>
51                     <td>${item.factory}</td>
52                     <td>${item.model}</td>
53                     <td>${item.spec}</td>
54                     <td><a href="CourseServlet?method=getcoursebyid&id=${item.id}">修改</a></td>
55                 </tr>
56             </c:forEach>
57         </table>
58     </div>
59 </body>
60 </html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <div align="center">
22         <h1 style="color: red;">商品信息查询</h1>
23         <a href="index.jsp">返回主页</a>
24         <form action="CourseServlet?method=search" method="post" onsubmit="return check()">
25             <div class="a">
26                 名称<input type="text" id="name" name="name"/>
27             </div>
28             <div class="a">
29                 生产商家<input type="text" id="factory" name="factory" />
30             </div>
31             <div class="a">
32                 型号<input type="text" id="model" name="model" />
33             </div>
34             <div class="a">
35                 规格<input type="text" id="spec" name="spec" />
36             </div>
37             <div class="a">
38                 <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;&nbsp;询</button>
39             </div>
40         </form>
41     </div>
42     <script type="text/javascript">
43         function check() {
44             var name = document.getElementById("name");;
45             var factory = document.getElementById("factory");
46             var model = document.getElementById("model");
47             var spec = document.getElementById("spec");
48             
49             //非空
50             if(name.value == '' && factory.value == '' && model.value == '' && spec.value == '') {
51                 alert('请填写一个条件');
52                 return false;
53             }
54         }
55     </script>
56 </body>
57 </html>

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 4 <!DOCTYPE html>
 5 <html>
 6 <head>
 7 <meta charset="UTF-8">
 8 <title>Insert title here</title>
 9 <style>
10     .a{
11         margin-top: 20px;
12     }
13     .b{
14         font-size: 20px;
15          160px;
16         color: white;
17         background-color: greenyellow;
18     }
19     .tb, td {
20         border: 1px solid black;
21         font-size: 22px;
22     }
23 </style>
24 </head>
25 <body>
26     <div align="center">
27         <h1 style="color: red;">商品信息列表</h1>
28         <a href="index.jsp">返回主页</a>
29         <table class="tb">
30             <tr>
31                 <td>id</td>
32                 <td>名称</td>
33                 <td>生产商家</td>
34                 <td>型号</td>
35                 <td>规格</td>
36             </tr>
37             <!-- forEach遍历出adminBeans -->
38             <c:forEach items="${wares}" var="item" varStatus="status">
39                 <tr>
40                     <td>${item.id}</td>
41                     <td><a>${item.name}</a></td>
42                     <td>${item.factory}</td>
43                     <td>${item.model}</td>
44                     <td>${item.spec}</td>
45                 </tr>
46             </c:forEach>
47         </table>
48     </div>
49 </body>
50 </html>

实验总结：500——servlet错误

404找不到连接途径

我觉得这次试验就是为了解决这两个问题！！！！！！！！！

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原文地址：https://www.cnblogs.com/0518liu/p/10117257.html