Servlet中连接数据库并显示

来源：互联网发布：ai中文版mac下载编辑：程序博客网时间：2024/05/16 12:05

将jar包复制到项目lib目录下
mysql-connector-java-5.1.6-bin下载地址：
http://115.com/file/dp521sz8
package testConn;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShowConn extends HttpServlet {

   @Override
   protectedvoid doGet(HttpServletRequest req, HttpServletResponse resp)
         throws ServletException, IOException {
      Connection conn = null;
      Statement stmt = null;
      ResultSet rs = null;
      resp.setContentType("text/html");
      resp.setCharacterEncoding("Gb2312");
      PrintWriter out = resp.getWriter(); //输出流
      out.println("<tableborder=1>");   //打印出表格
      out.print("<tr><td>名字</td><td>主人</td><td>年龄</td><td>出生日期</td></tr>");
      try{
         Class.forName("com.mysql.jdbc.Driver");
         conn =DriverManager.getConnection("jdbc:mysql://localhost/test01?user=root&password=");
         //test01数据库
         stmt = conn.createStatement();
         rs = stmt.executeQuery("select * from pet;");//查询语句
         while(rs.next()){ //每当有一条记录就输出一行
            out.print("<tr>");//从pet中获取value
            out.println("<td>"+rs.getString("name") +"</td>");
            out.println("<td>"+rs.getString("owner") +"</td>");
            out.println("<td>"+rs.getString("age") + "</td>");
            out.println("<td>"+rs.getString("birth") +"</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();
         }
      }
   }
}