deletestudentregister.java

servlet做控制层示例

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   DeleteStudentRegister.java

package com.saintbo.servlet.student;

import com.saintbo.entity.student.TblStudentRegister;
import com.saintbo.javabean.sys.UserInfo;
import com.saintbo.servlet.MyExtendedServlet;
import com.saintbo.session.student.StudentSessionLocal;
import com.saintbo.session.student.StudentSessionLocalHome;
import com.saintbo.util.upload.RequestHashtable;
import com.saintbo.util.upload.UploadRequest;
import java.io.IOException;
import javax.naming.InitialContext;
import javax.servlet.*;
import javax.servlet.http.HttpSession;

public class DeleteStudentRegister extends MyExtendedServlet
{

    public DeleteStudentRegister()
    {
    }

    public void handle()
        throws IOException, ServletException
    {
        UserInfo userInfo = (UserInfo)session.getAttribute("USERINFO");
        int userAuthority = super.checkAuthority(userInfo, 1, 0);
        if(userAuthority != 1)
            return;
        reqInfo = UploadRequest.upload(req);
        Long rowsID = new Long((String)reqInfo.get("RowsID"));
        String studentID = "";
        if(userInfo.getUserType().equals(new Integer(1)))
            studentID = userInfo.getUserID();
        else
        if(userInfo.getUserType().equals(new Integer(3)))
            studentID = (String)reqInfo.get("StudentID");
        TblStudentRegister studentRegister = null;
        String errorMessage = "";
        boolean result = false;
        if(rowsID != null)
            try
            {
                InitialContext jndiContext = new InitialContext();
                StudentSessionLocalHome home = (StudentSessionLocalHome)jndiContext.lookup("StudentSessionLocal");
                StudentSessionLocal local = home.create();
                studentRegister = local.getStudentRegisterByID(rowsID);
                if(studentRegister != null)
                {
                    if(studentRegister.getIsRegisterID().equals("1"))
                        errorMessage = "此条辅修信息教务处已经确认，您不能删除.";
                    else
                    if(studentRegister.getIsRegisterID().equals("0"))
                    {
                        studentRegister.remove();
                        result = true;
                    }
                } else
                {
                    errorMessage = "在数据库中找不到您要的这条辅修信息.";
                }
                local.remove();
                jndiContext.close();
            }
            catch(Exception e)
            {
                errorMessage = "当删除学生辅修信息时出现错误.";
                result = false;
                e.printStackTrace();
            }
        else
            errorMessage = "传进来的学生辅修信息关键字不能为空.";
        if(result)
        {
            getServletContext().getRequestDispatcher("/student/studregisterlist.jsp?studentID=" + studentID).forward(req, res);
        } else
        {
            session.setAttribute("ERRORMESSAGE", errorMessage);
            getServletContext().getRequestDispatcher("/error/error.jsp").forward(req, res);
        }
    }
}