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>");
          
        
    }

}

 

posted @ 2015-08-04 10:39  fleam  阅读(186)  评论(0)    收藏  举报