注：該servlet鏈接的是mySql數據庫，數據庫名為test_db 在運行前需要加載mySql數據庫驅動 DBServlet servlet文件代碼如下:: package com; import java.io.*; //導入java.io包 import java.util.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; public class DBServlet extends HttpServlet{ //定義一個繼承HttpServlet的公有類 ServletConfig config=null; //定義一個ServletConfig對象 private String driverName=""; //定義私有字符串常量並初始化 private String username=""; //定義的數據庫用戶名 private String password=""; //定義的數據庫連接密碼 private String dbName=""; //定義的數據庫名 private Connection conn; //初始化連接 private Statement stmt; //初始化數據庫操作 ResultSet rs=null; //初始化結果集 public void init(ServletConfig config)throws ServletException{ super.init(config); //繼承父類的init()方法 this.config=config; //獲取配置信息 driverName=config.getInitParameter("driverName");//從配置文件中獲取JDBC驅動名 username=config.getInitParameter("username"); //獲取數據庫用戶名 password=config.getInitParameter("password"); //獲取數據庫連接密碼 dbName=config.getInitParameter("dbName"); //獲取要連接的數據庫 } public void doGet(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{ resp.setContentType("text/html;charset=GBK"); //設置字符編碼格式 PrintWriter out=resp.getWriter(); //實例化對象，用於頁面輸出 out.println("<html>"); //實現生成靜態Html out.println("<head>"); out.println("<meta http-equiv=\"Content-Type\"content=\"text/html;charset=GBK\">"); out.println("<title>DataBase Connection</title>"); out.println("</head>"); out.println("<body bgcolor=\"white\">"); out.println("<center>"); String url="jdbc:mysql://127.0.0.1:3307/test_db"; try{ Class.forName("com.mysql.jdbc.Driver"); conn=DriverManager.getConnection(url,username,password); stmt=conn.createStatement(); String sql="select * from t_food_order"; rs=stmt.executeQuery(sql); out.println("Servlet訪問數據庫成功"); out.println("<table border=1 bordercolorlight=#000000>"); out.println("<tr><td width=40>序號</td>"); out.println("<td>書名</td>"); out.println("<td>城市</td>"); //out.println("<td>州</td>"); //out.println("<td>國</td></tr>"); while(rs.next()){ out.println("<tr><td>"+rs.getString(1)+"</td>"); out.println("<td>"+rs.getString(2)+"</td>"); out.println("<td>"+rs.getString(3)+"</td>"); //out.println("<td>"+rs.getString(4)+"</td>"); //out.println("<td>"+rs.getString(5)+"</td>"); out.println("<tr>"); } out.println("</table>"); rs.close(); stmt.close(); conn.close(); }catch(Exception e){ e.printStackTrace(); out.println(e.toString()); } out.println("</center>"); out.println("</body>"); out.println("</html>"); } public void doPost(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{ this.doGet(req,resp); } public void destory(){ config=null; driverName=null; username=null; password=null; dbName=null; conn=null; stmt=null; rs=null; } } web.xml文件如下：： <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>DBServlet</servlet-name> <servlet-class>com.DBServlet</servlet-class> <init-param> <param-name>driverName</param-name> <param-value>com.mysql.jdbc.Driver</param-value> </init-param> <init-param> <param-name>username</param-name> <param-value>root</param-value> </init-param> <init-param> <param-name>password</param-name> <param-value>root</param-value> </init-param> <init-param> <param-name>dbName</param-name> <param-value>test_db</param-value> </init-param> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>Ka</servlet-name> <servlet-class>com.Ka</servlet-class> </servlet> <servlet-mapping> <servlet-name>DBServlet</servlet-name> <url-pattern>/DBServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Ka</servlet-name> <url-pattern>/Ka</url-pattern> </servlet-mapping> </web-app>
轉自：http://www.cnblogs.com/penseur/archive/2012/05/15/2502120.html
servlet連接MySql數據庫
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