学习练习读取学生信息表并添加数据

Posted 2020-08-03 Clown

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 1 <%@page import="java.sql.*"%>
 2 <%@page import="java.sql.DriverManager"%>
 3 <%@ page language="java" contentType="text/html; charset=UTF-8"
 4     pageEncoding="UTF-8"%>
 5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 6 <html>
 7 <head>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <title>学生信息</title>
10 </head>
11 <body>
12 学生信息列表
13 <br>
14 <%
15 
16 try
17 {
18 // 1. 连接数据库
19 // 1)加载驱动
20     Class.forName("oracle.jdbc.driver.OracleDriver");
21 
22 // 2)得到连接
23  Connection conn =  DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL",
24          "test1","1234");
25 // 2. 读取数据库
26 Statement st = conn.createStatement();
27 
28 ResultSet rs = st.executeQuery("select * from T_STUDENTS");
29 
30 // 3. 输出结果集
31 if (rs != null)
32 {
33     while(rs.next())
34     {
35         out.print("SNO = " + rs.getString("SNO") + "  ");
36         out.print("name = "  + rs.getString("sname") + "  ");
37         out.print("ssex = " + rs.getString("ssex") + "  ");
38         out.print("sbirthday = " + rs.getString("sbirthday") + "  ");
39         out.print("calss = " + rs.getString("class") + "<br>");
40         
41     }
42     rs.close();
43 }
44 
45 // 4. 释放资源
46 st.close();
47 conn.close();
48 }
49 catch (Exception e)
50 
51 {
52 
53     e.printStackTrace();
54     System.out.println("连接数据库失败");
55 } 
56 
57 %>
58 
59 添加学生信息<br>
60 <form action="SaveStudent" method = "post">
61 学号：<input type = "text" name = "sno"><br>
62 名称：<input type = "text" name = "sname"><br>
63 性别：<input type = "text" name = "ssex"><br>
64 生日：<input type = "text" name = "sbirthday"><br>
65 班级：<input type = "text" name = "class"><br>
66 
67 <input type = "submit" value = "保存">
68 </form>
69 
70 </body>
71 </html>

 1 package com.hanqi.web;
 2 import java.sql.*;
 3 import java.io.IOException;
 4 import java.sql.Connection;
 5 import java.sql.PreparedStatement;
 6 
 7 import javax.servlet.ServletException;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 
12 
13 public class SaveStudent extends HttpServlet {
14     private static final long serialVersionUID = 1L;
15      
16     public SaveStudent() {
17         super();
18         
19     }
20 
21     
22     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
23         
24         // 处理保存数据的请求
25         
26         // 1.接受参数
27         String sno = request.getParameter("sno");
28         String sname = request.getParameter("sname");
29         String ssex = request.getParameter("ssex");
30         String sbirthday = request.getParameter("sbirthday");
31         String sclass = request.getParameter("class");
32         
33         // 2.验证参数
34         if (sno != null && sno.trim().length() != 0
35                 && sname !=null && sname.trim().length() !=0)
36         {
37             try
38             {
39             // 3.保存参数
40             Class.forName("oracle.jdbc.driver.OracleDriver");
41 
42             // 2)得到连接
43              Connection conn =  DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL",
44                      "test1","1234");
45             // 2. 读取数据库
46             //Statement st = conn.createStatement();
47             PreparedStatement pst = conn.prepareStatement(
48                     "insert into  t_students(sno,sname,ssex,class)"+
49             "values(?,?,?,?)");
50             
51             pst.setString(1, sno);
52             pst.setString(2, sname);
53             pst.setString(3, ssex);
54             //pst.setDate(4, x);
55             pst.setString(4, sclass);
56             
57             pst.executeUpdate();
58             
59             pst.close();
60             conn.close();
61             
62             
63             // 4.跳转页面
64             response.getWriter().print("保存成功");;
65             response.setHeader("refresh", "3;URL=index.jsp");
66             
67             }
68             catch(Exception e)
69             {
70                 e.printStackTrace();
71                 response.getWriter().print("保存失败");;
72                 response.setHeader("refresh", "3;URL=index.jsp");
73             }
74             
75             
76         }
77         else
78         {
79             response.getWriter().print("请正确提交数据");;
80             response.setHeader("refresh", "3;URL=index.jsp");
81         }
82         
83     
84     }
85 
86     
87     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
88         
89         doGet(request, response);
90     }
91 
92 }

 1 package com.hanqi.web;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.Filter;
 5 import javax.servlet.FilterChain;
 6 import javax.servlet.FilterConfig;
 7 import javax.servlet.ServletException;
 8 import javax.servlet.ServletRequest;
 9 import javax.servlet.ServletResponse;
10 
11 
12 public class MyFilter implements Filter {
13 
14     public MyFilter() {
15         
16     }
17 
18     
19     public void destroy() {
20         
21     }
22 
23     
24     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
25         
26         //添加过滤
27         request.setCharacterEncoding("UTF-8");
28         
29         response.setContentType("text/html");
30         
31         response.setCharacterEncoding("UTF-8");
32         
33         
34         
35         
36         chain.doFilter(request, response);
37     }
38 
39     
40     public void init(FilterConfig fConfig) throws ServletException {
41         
42     }
43 
44 }

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