servelet 连接mysql

package helloworld;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.*;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 */

@WebServlet("/HelloWorld")

public class HelloWorld extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * Default constructor.

     */

    public HelloWorld() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Connection conn = null;

          Statement stmt = null;

          ResultSet rs = null;

          response.setContentType("text/html");

          response.setCharacterEncoding("gb2312");

          PrintWriter out = response.getWriter();

          out.println("<table border=1>");

          out.println("<tr><td>查询结果</td></tr>");

          try{

           Class.forName("com.mysql.jdbc.Driver"); //lib

           conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/gs?user=root&password=root");

           stmt = conn.createStatement();

           rs = stmt.executeQuery("select * from user");

           while(rs.next()){

            out.println("<tr>");

            out.println("<td>"+rs.getString("name")+"</td>");

            out.println("</tr>");

           }

           out.println("</table>");

          }catch (ClassNotFoundException e){

           e.printStackTrace();

           }catch (SQLException e){

            e.printStackTrace();

           }

          finally{

            try{

             if(rs !=null){

              rs.close();

              rs=null;

             }

             if(stmt != null){

              stmt.close();

              stmt=null;

             }

             if(conn!=null){

              conn.close();

              conn=null;

             }

            }

             catch(SQLException e){

              e.printStackTrace();

             }

            }

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        PrintWriter out = response.getWriter();

        out.println("<html><head><title>helloworld</title><head><body>hello world!!!</body></html>");

    }

}
巴特西

servelet 连接mysql

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