deletereader.java

JAVA的MVC三层开发的图书馆管理系统。

package mypackage;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.sql.*;
import javax.sql.DataSource;

public class DeleteReader extends HttpServlet 
{
  private static final String CONTENT_TYPE = "text/html; charset=GBK";

  public void init(ServletConfig config) throws ServletException
  {
    super.init(config);
  }

  public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    response.setContentType(CONTENT_TYPE);
    DataSource ds = (DataSource)request.getSession().getServletContext().getAttribute("DataSrc");
    String id = request.getParameter("id");
    String sql = "delete * from reader where readerid =" + id;
    int seccess = 0;
    try{
      Connection conn = ds.getConnection();
      Statement stmt = conn.createStatement();
      seccess = stmt.executeUpdate(sql);
      stmt.close();
      conn.close();
    }
    catch(SQLException e){
      System.out.println(e.getMessage());
    }
    if(seccess > 0)
   request.getSession().getServletContext().getRequestDispatcher("Seccess.jsp").forward(request, response);
    else
     request.getSession().getServletContext().getRequestDispatcher("Fail.jsp").forward(request, response);
  }
}