loginaction.java

学生管理系统的Java实现

package request.action;

import java.sql.ResultSet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import request.forms.LoginForm;
import dao.DataStoreDao;
import bean.MD5;

public class LoginAction extends Action {
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		LoginForm loginForm = (LoginForm) form;
		MD5 md5 = new MD5();
		HttpSession session = request.getSession(true);
		ActionErrors errors = new ActionErrors();
		ActionMessages messages = new ActionMessages();

		String login_id = (String) loginForm.getId();
		String login_password = (String) loginForm.getPassword();
		login_password = new String(login_password.getBytes("UTF-8"), "GBK");

		login_password = md5.getMD5ofStr(login_password);//md5编码
		DataStoreDao db = DataStoreDao.getInstance();

		if (db == null) {
			errors.add("db.error", new ActionMessage("db.connection.error"));
			saveErrors(request, errors); // <html:errors property="db.error"/>
			return (mapping.findForward("fail"));
		}

		ResultSet st = null;
		String sql = "select id,password,lv,name from teacher where id='" + login_id
				+ "' and password='" + login_password + "'";

		try {
			st = db.read(sql);

			if (st != null && st.next()) {

				// session
				session.setAttribute("lv", st.getString(3));
				session.setAttribute("current_user", login_id);
				session.setAttribute("current_name", st.getString(4));
				db.stop();
				return (mapping.findForward("success"));
			} else {

				messages.add("login.error", new ActionMessage(
						"admin.login.error"));
				saveMessages(request, messages);
				form.reset(mapping, request);//调用重置


				return (mapping.findForward("fail"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}