delete.java 2.0 KB

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  1. package p1;
  2. import java.io.IOException;
  3. import java.io.PrintWriter;
  4. import java.sql.Connection;
  5. import java.sql.DriverManager;
  6. import java.sql.PreparedStatement;
  7. import javax.servlet.ServletException;
  8. import javax.servlet.http.HttpServlet;
  9. import javax.servlet.http.HttpServletRequest;
  10. import javax.servlet.http.HttpServletResponse;
  11. public class delete extends HttpServlet {
  12. protected void processRequest(HttpServletRequest request, HttpServletResponse response)
  13. throws ServletException, IOException {
  14. response.setContentType("text/html;charset=UTF-8");
  15. try (PrintWriter out = response.getWriter()) {
  16. String driver="com.mysql.cj.jdbc.Driver";
  17. String url="jdbc:mysql://localhost:3306/edu?characterEncoding=utf-8"
  18. + "&serverTimezone=UTC";
  19. String usr="root";
  20. String password="1234";
  21. try{
  22. Class.forName(driver);
  23. Connection conn=DriverManager.getConnection(url,usr,password);
  24. String sqlString="delete from manager1 where count=?";
  25. PreparedStatement pstmt=conn.prepareStatement(sqlString);
  26. String count =request.getParameter("count");
  27. pstmt.setString(1, count);
  28. pstmt.execute();
  29. }catch(Exception e){
  30. System.err.println("error:"+e);
  31. }
  32. response.sendRedirect("pages/display.jsp");
  33. }
  34. }
  35. @Override
  36. protected void doGet(HttpServletRequest request, HttpServletResponse response)
  37. throws ServletException, IOException {
  38. processRequest(request, response);
  39. }
  40. @Override
  41. protected void doPost(HttpServletRequest request, HttpServletResponse response)
  42. throws ServletException, IOException {
  43. processRequest(request, response);
  44. }
  45. @Override
  46. public String getServletInfo() {
  47. return "Short description";
  48. }
  49. }