servletadmin.java

在线教育平台： 从小学

package edu;

import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Servletadmin extends javax.servlet.http.HttpServlet implements
		javax.servlet.Servlet {
	public void doGet(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		int id = 0;
		HttpSession session = req.getSession(true);
		String admin = req.getParameter("admin");
		int success = 0;
		String sort = "";
		try {
			sort = session.getAttribute("sort").toString();
		} catch (NullPointerException e) {
		}
		String action = null;
		action = req.getParameter("action");
		try {
			id = Integer.valueOf(req.getParameter("id")).intValue();
		} catch (NumberFormatException e) {
		}
		AdminBean admins = null;
		// String message="";
		if (sort.equals("admin")) {
			if ("new".equalsIgnoreCase(action)) {

				admins = doNew(req, res);

				sendBean(req, res, admins, "addadmin.jsp");
			}

			if ("update".equalsIgnoreCase(action)) {
				try {
					admins = doUpdate(req, res, admin);

					sendBean(req, res, admins, "addadmin.jsp");
				} catch (SQLException e) {
				}
			}

			if ("delete".equalsIgnoreCase(action)) {

				try {
					success = doDelete(id);
				} catch (SQLException e) {
				}
				if (success != 1) {
					doError(req, res, "删除失败. Rows affected: " + success);
				} else {
					res.sendRedirect("addadmin.jsp");
				}

			}
		} else
			doError(req, res, "你无权操作，或你还没有登陆！");
	}

	public AdminBean doNew(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		AdminBean admins = new AdminBean();
		Md5Bean md5 = new Md5Bean();
		String pswss = req.getParameter("pswss");
		String admin = new String(req.getParameter("admin").getBytes(
				"ISO8859_1"));

		String psw = req.getParameter("psw");

		if (isTrue(req, res, pswss, admin, psw) && hasLogin(req, res, admin)) {

			psw = md5.getMD5ofStr(psw);
			admins.setAdmin(admin);
			admins.setPsw(psw);

			admins.addAdmin();
		}
		return admins;

	}

	public AdminBean doUpdate(HttpServletRequest req, HttpServletResponse res,
			String admin) throws ServletException, IOException, SQLException {
		AdminBean admins = new AdminBean();
		Md5Bean md5 = new Md5Bean();
		int id = 0;
		admin = new String(req.getParameter("admin").getBytes("ISO8859_1"));
		String pswss = req.getParameter("pswss");
		String psw = req.getParameter("psw");
		try {
			id = Integer.valueOf(req.getParameter("id")).intValue();
		} catch (NumberFormatException e) {
		}
		if (isTrue(req, res, pswss, admin, psw)) {
			psw = md5.getMD5ofStr(psw);
			admins.setAdmin(admin);
			admins.setPsw(psw);
			admins.setId(id);

			admins.updateAdmin();
		}
		return admins;
	}

	public int doDelete(int id) throws SQLException {
		int num = 0;
		AdminBean admins = new AdminBean();
		num = admins.deleteAdmin(id);
		return num;
	}

	public void sendBean(HttpServletRequest req, HttpServletResponse res,
			AdminBean admins, String target) throws ServletException,
			IOException {
		req.setAttribute("admins", admins);
		try {
			RequestDispatcher rd = req.getRequestDispatcher(target);
			rd.forward(req, res);
		} catch (Throwable t) {
		}
	}

	public void doError(HttpServletRequest req, HttpServletResponse res,
			String str) throws ServletException, IOException {

		req.setAttribute("problem", str);
		try {
			RequestDispatcher rd = req
					.getRequestDispatcher("/errorpage_ad.jsp");
			rd.forward(req, res);
		} catch (Throwable t) {

		}

	}

	public boolean hasLogin(HttpServletRequest req, HttpServletResponse res,
			String name) throws ServletException, IOException {
		boolean f = true;
		String message = "对不起，该帐号已经被注册过了!";
		AdminBean admins = new AdminBean();
		f = admins.hasLogin(name);
		if (f == false) {
			doError(req, res, message);
		}
		return f;
	}

	public boolean isTrue(HttpServletRequest req, HttpServletResponse res,
			String pswss, String name, String psw) throws ServletException,
			IOException {
		boolean f = true;
		String message = "";

		if (name == null || name.equals("")) {
			f = false;
			message = "帐号不能为空，请重新填写！";
			doError(req, res, message);
		}

		if (psw == null || psw.equals("")) {
			f = false;
			message = "密码不能为空，请重新填写！";
			doError(req, res, message);
		}

		if (pswss.equals("") != psw.equals("")) {
			f = false;
			message = "两密码不匹配，请重新填写！";
			doError(req, res, message);
		}

		return f;

	}

	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {

		doGet(req, res);

	}

}