📄 ck_login.java
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import db.*;
import java.sql.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ck_login extends HttpServlet {
/**
* Constructor of the object.
*/
public ck_login() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String user_id = request.getParameter("user_id");
String pwd = request.getParameter("pwd");
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
try {
Connection con=DBConnection.getConnection();
PreparedStatement stm =
con.prepareStatement("select * from users where id='" + user_id
+"' and pwd='" + pwd + "'");
ResultSet rs = stm.executeQuery();
if(rs.next()){
Cookie ck= new Cookie("user_id",user_id);
ck.setMaxAge(-1);
ck.setPath("/"); //可设到"/GuestBook"
response.addCookie(ck);
response.sendRedirect("../view_msg.jsp");
}else{
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>登录错误</TITLE></HEAD>");
out.println(" <BODY>");
out.println("用户ID：" + user_id + "不存在，或密码错误，请 <a href=\"../login.html\">返回</a> 重新输入！");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
rs.close();
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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