jsp代码实例第306

code306.java

package pack08;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

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


//DBServlet类
@WebServlet(name = "code305",urlPatterns = "/page11/pack08.code305")
public class code305 extends HttpServlet
{
  protected Connection conn = null;
  protected ResultSet execSQL(String sql,Object... args) throws Exception
  {
    PreparedStatement pStmt = conn.prepareStatement(sql);
    for (int i = 0; i < args.length; i++)
    {
      pStmt.setObject(i+1, args[i]);
    }
    pStmt.execute();
    return pStmt.getResultSet();
  }

  protected boolean checkValidationCode(HttpServletRequest request,String validationCode)
  {
    String codeSession = (String)request.getSession().getAttribute("validationCode");
    if (codeSession == null)
    {
      String temp = "验证码过期";
      request.setAttribute("info", temp);
      request.setAttribute("codeError", temp);
      return false;
    }

    if (!validationCode.equalsIgnoreCase(codeSession))
    {
      String temp = "验证码不正确";
      request.setAttribute("info", temp);
      request.setAttribute("codeError", temp);
      return false;
    }

    return true;
  }

  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    try
    {
      if (conn == null)
      {
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test";
        String user = "root";
        String pwd = "mysql123";
        conn = DriverManager.getConnection(url,user,pwd);
      }
    } catch (Exception e)
    {
      //e.printStackTrace();
    }
  }

  @Override
  public void destroy()
  {
    try
    {
      if (conn != null)
      {
        conn.close();
      }
    } catch (Exception e)
    {
      //e.printStackTrace();
    }
  }
}