delservlet.java

jsp+servlet经典的登录注册

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import dao.DAO;

public class DelServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		request.setCharacterEncoding("gbk");
		response.setContentType("text/html;charset=gbk");
		PrintWriter out = response.getWriter();
		try {
			int userID = Integer.parseInt(request.getParameter("userID").toString());
			String sql = "delete login where userID=" + userID + "";
			DAO dao = new DAO();
			int n = dao.del(sql);
System.out.println(n);			
			if(n == 1){
				out.write("<script type='text/javascript'>alert('删除成功!');</script>");
			} else {
				out.write("<script type='text/javascript'>alert('删除失败!');</script>");
			}
			response.sendRedirect("/login/servlet/LoginCheck");
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
		out.flush();
		out.close();
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

}