使用 servlet 连接数据库
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使用 servlet 连接数据库
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1.項目工程 web.xml 配置
1 <servlet>2 <description>This is the description of my J2EE component</description>
3 <display-name>This is the display name of my J2EE component</display-name>
4 <servlet-name>DBServlet</servlet-name>
5 <servlet-class>org.olive.DBServlet</servlet-class>
6 <init-param>
7 <param-name>driverName</param-name>
8 <param-value>com.microsoft.jdbc.sqlserver.SQLServerDriver</param-value>
9 </init-param>
10 <init-param>
11 <param-name>username</param-name>
12 <param-value>sa</param-value>
13 </init-param>
14 <init-param>
15 <param-name>password</param-name>
16 <param-value></param-value>
17 </init-param>
18 <init-param>
19 <param-name>dbName</param-name>
20 <param-value>pubs</param-value>
21 </init-param>
22
23 </servlet> 1 <servlet-mapping>
2 <servlet-name>DBServlet</servlet-name>
3 <url-pattern>/servlet/DBServlet</url-pattern>
4 </servlet-mapping>
2.servlet? java文件
DBServlet.java 1 package org.olive;2
3 import java.io.*; //導(dǎo)入java.io包
4 import java.util.*;
5 import java.sql.*;
6 import javax.servlet.*;
7 import javax.servlet.http.*;
8 public class DBServlet extends HttpServlet{ //定義一個繼承HttpServlet的公有類
9 ServletConfig config=null; //定義一個ServletConfig對象
10 private String driverName=""; //定義私有字符串常量并初始化
11 private String username=""; //定義的數(shù)據(jù)庫用戶名
12 private String password=""; //定義的數(shù)據(jù)庫連接密碼
13 private String dbName=""; //定義的數(shù)據(jù)庫名
14 private Connection conn; //初始化連接
15 private Statement stmt; //初始化數(shù)據(jù)庫操作
16 ResultSet rs=null; //初始化結(jié)果集
17 public void init(ServletConfig config)throws ServletException{
18 super.init(config); //繼承父類的init()方法
19 this.config=config; //獲取配置信息
20 driverName=config.getInitParameter("driverName");//從配置文件中獲取JDBC驅(qū)動名
21 username=config.getInitParameter("username"); //獲取數(shù)據(jù)庫用戶名
22 password=config.getInitParameter("password"); //獲取數(shù)據(jù)庫連接密碼
23 dbName=config.getInitParameter("dbName"); //獲取要連接的數(shù)據(jù)庫
24 }
25 public void doGet(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{
26
27 resp.setContentType("text/html;charset=GBK"); //設(shè)置字符編碼格式
28 PrintWriter out=resp.getWriter(); //實(shí)例化對象，用于頁面輸出
29 out.println("<html>"); //實(shí)現(xiàn)生成靜態(tài)Html
30 out.println("<head>");
31 out.println("<meta http-equiv=\"Content-Type\"content=\"text/html;charset=GBK\">");
32 out.println("<title>DataBase Connection</title>");
33 out.println("</head>");
34 out.println("<body bgcolor=\"white\">");
35 out.println("<center>");
36 String url="jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=pubs";
37 try{
38 Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
39 conn=DriverManager.getConnection(url,username,password);
40 stmt=conn.createStatement();
41 String sql="use pubs select * from publishers";
42 rs=stmt.executeQuery(sql);
43 out.println("Servlet訪問數(shù)據(jù)庫成功");
44 out.println("<table border=1 bordercolorlight=#000000>");
45 out.println("<tr><td width=40>序號</td>");
46 out.println("<td>書名</td>");
47 out.println("<td>城市</td>");
48 out.println("<td>州</td>");
49 out.println("<td>國</td></tr>");
50 while(rs.next()){
51 out.println("<tr><td>"+rs.getString(1)+"</td>");
52 out.println("<td>"+rs.getString(2)+"</td>");
53 out.println("<td>"+rs.getString(3)+"</td>");
54 out.println("<td>"+rs.getString(4)+"</td>");
55 out.println("<td>"+rs.getString(5)+"</td>");
56 out.println("<tr>");
57 }
58 out.println("</table>");
59 rs.close();
60 stmt.close();
61 conn.close();
62
63 }catch(Exception e){
64 e.printStackTrace();
65 out.println(e.toString());
66 }
67 out.println("</center>");
68 out.println("</body>");
69 out.println("</html>");
70 }
71 public void doPost(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{
72 this.doGet(req,resp);
73 }
74 public void destory(){
75 config=null;
76 driverName=null;
77 username=null;
78 password=null;
79 dbName=null;
80 conn=null;
81 stmt=null;
82 rs=null;
83 }
84 }
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