用QueryRunner读取数据库的内容，每个对象代表一条记录来读取

package cn.com.jobedu.blog;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

public class GetBlogServlet extends HttpServlet {

 private static final long serialVersionUID = -7152478870507997462L;

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  DataSource ds = null;
  String id = request.getParameter("id");
  try {
   InitialContext context = new InitialContext();
   ds = (DataSource) context.lookup("java:/comp/env/jdbc/mysqlds");
  } catch (Exception e) {
   System.out.println("获取数据源时出错");
  }
  try {
   String sql = "select id, title, content, createdtime from blog where id="
     + id;
   QueryRunner qr = new QueryRunner(ds);
   List list = (List) qr.query(sql, new BeanListHandler(Blog.class)); //Blog类中提供get和set方法
   Blog blog = (Blog) list.get(0);
   
   System.out.println(blog.getId());
   System.out.println(blog.getTitle());
   System.out.println(blog.getContent());
   System.out.println(blog.getCreatedTime());
   

  } catch (SQLException e) {
   e.printStackTrace();
  }
  

  //request.setAttribute("message", message);
  //request.getRequestDispatcher("/addBlogResult.jsp").forward(request,response);
 }
}