queryclassinfo.java

中学教学管理系统

package servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

import utility.DBConnection;
import beans.Class;

public class QueryClassInfo extends HttpServlet {

	public QueryClassInfo() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

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

		HttpSession session = request.getSession();
		
		//设定编码类型，避免传递中文参数出现乱码
		request.setCharacterEncoding("gb2312");
		
		String classNo = request.getParameter("calssNumber");
		
		if(classNo==null || classNo.equals(""))
		{
			response.sendRedirect("/TeacherManager/manageClassSetting/inquire_class_information.jsp?suc=false");
			return;
		}
		
		//数据库
		try{
			Connection con = DBConnection.getConnection();
			Statement st = con.createStatement();
			String query = "select * from class where class.classNo = '" + classNo +"';";
			ResultSet rs = st.executeQuery(query);
			
			if(!rs.next())
			{
				con.close();
				response.sendRedirect("/TeacherManager/manageClassSetting/inquire_class_information.jsp?suc=false");
				return;
			}
			
			Class c = new Class();
			c.setClassNo(rs.getString("classNo"));
			c.setClassRoomNo(rs.getString("classroomNo"));
			c.setTeacherNo(rs.getString("teachNo"));
			c.setClassSize(rs.getString("classSize"));
			c.setClassYear(rs.getString("classYear"));
			session.setAttribute("classInfo", c);
			
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
			response.sendRedirect("/TeacherManager/manageClassSetting/inquire_class_information.jsp?suc=false");
			return;
		}
		
		response.sendRedirect("/TeacherManager/manageClassSetting/inquire_class_information.jsp?suc=true");
		return;
	}

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

		doGet(request, response);
	}

	public void init() throws ServletException {
		// Put your code here
	}

}