1.项目工程 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.*; //导入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{ //定义一个继承HttpServlet的公有类
9 ServletConfig config=null; //定义一个ServletConfig对象
10 private String driverName=""; //定义私有字符串常量并初始化
11 private String username=""; //定义的数据库用户名
12 private String password=""; //定义的数据库连接密码
13 private String dbName=""; //定义的数据库名
14 private Connection conn; //初始化连接
15 private Statement stmt; //初始化数据库操作
16 ResultSet rs=null; //初始化结果集
17 public void init(ServletConfig config)throws ServletException{
18 super.init(config); //继承父类的init()方法
19 this.config=config; //获取配置信息
20 driverName=config.getInitParameter("driverName");//从配置文件中获取JDBC驱动名
21 username=config.getInitParameter("username"); //获取数据库用户名
22 password=config.getInitParameter("password"); //获取数据库连接密码
23 dbName=config.getInitParameter("dbName"); //获取要连接的数据库
24 }
25 public void doGet(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{
26
27 resp.setContentType("text/html;charset=GBK"); //设置字符编码格式
28 PrintWriter out=resp.getWriter(); //实例化对象，用于页面输出
29 out.println("<html>"); //实现生成静态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访问数据库成功");
44 out.println("<table border=1 bordercolorlight=#000000>");
45 out.println("<tr><td width=40>序号</td>");
46 out.println("<td>书名</td>");
47 out.println("<td>城市</td>");
48 out.println("<td>州</td>");
49 out.println("<td>国</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 }