一，本例使用JDBC连接mysql数据库
package com.test; import java.io.IOException; import java.io.PrintWriter; import java.sql.*; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class GetMysql extends HttpServlet { /** * Constructor of the object. */ public GetMysql() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ private static final long serUid=1L; //加载驱动 static final String jdbc="com.mysql.jdbc.Driver"; //要连接的数据库url static final String db_url="jdbc:mysql://localhost:3306/test"; //数据库用户名 static final String user="dyb"; //数据库密码 static final String pass="174372150"; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn=null; Statement stmt=null; //显示的数据的格式 response.setContentType("text/html;charset=UTF-8"); PrintWriter out =response.getWriter(); try { Class.forName("com.mysql.jdbc.Driver"); //输入用户名密码和连接。 conn=DriverManager.getConnection(db_url,user,pass); //用于向数据库发送sql语句 stmt=conn.createStatement(); String sql=null; //输入sql语句获取想要的数据 sql="SELECT t.title,t.new_id," + "t.news_type_id,t.new_date," + "d.name FROM t_news t " + "JOIN t_type_id d on t.news_type_id=d.t_type_id"; //发送sql语句并返回结果 ResultSet rs=stmt.executeQuery(sql); //循环遍历打印结果 while (rs.next()) { int id=rs.getInt("t.news_type_id"); String lr=rs.getString("t.title"); String dd=rs.getString("t.new_date"); String name=rs.getString("d.name"); out.print("ID:"+id); out.print("内容："+lr); out.print("日期："+dd); out.print("名称："+name); out.println("</BR>"); } //关闭通道 rs.close(); conn.close(); stmt.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the POST method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }