TeacherSvlt.java
上传用户:ht0805
上传日期:2013-10-20
资源大小:384k
文件大小:5k
- import java.io.*;
- import java.sql.*;
- import javax.servlet.*;
- import javax.servlet.http.*;
- public class TeacherSvlt extends HttpServlet{
-
- public void doGet(HttpServletRequest req, HttpServletResponse res)
- throws ServletException, IOException {
-
- String tea_id =req.getParameter("id");
- int success = 0;
- String action = action = req.getParameter("action");
- teacher tea = null;
- String message="";
-
-
- if ("new".equalsIgnoreCase(action)) {
- tea = doNew(req,res);
-
- sendBean(req, res, tea, "/getteacher.jsp");
- }
-
- if ("update".equalsIgnoreCase(action)) {
- try{
- tea = doUpdate(req,res, tea_id);
- sendBean(req,res,tea,"/getteacher.jsp");
- }
- catch(SQLException e){}
- }
-
- if ("delete".equalsIgnoreCase(action)) {
- try{
- success = doDelete(tea_id);
- }
- catch(SQLException e){}
- if (success != 1) {
- doError(req, res, "TeacherSvlt: Delete unsuccessful. Rows affected: " + success);
- } else {
- res.sendRedirect("http://localhost:8080/test/getteacher.jsp");
- }
- }}
-
-
- public teacher doNew(HttpServletRequest req,HttpServletResponse res )
- throws ServletException,IOException{
- teacher tea= new teacher();
- String tea_id=req.getParameter("id");
- String name=new String(req.getParameter("name").getBytes("ISO8859_1"));
- String password= req.getParameter("password");
- String title=new String (req.getParameter("title").getBytes("ISO8859_1"));
-
- if(isTrue(req,res,tea_id,name,password) && hasLogin(req,res,tea_id)){
-
- tea.setId(tea_id);
- tea.setName(name);
- tea.setPassword(password);
- tea.setTitle(title);
- tea.addTeacher();
- }
- return tea;
-
- }
-
-
- public teacher doUpdate(HttpServletRequest req,HttpServletResponse res , String id)
- throws ServletException,IOException,SQLException {
- teacher tea = new teacher();
-
- String name=new String(req.getParameter("name").getBytes("ISO8859_1"));
- String password = req.getParameter("password");
- String title = new String(req.getParameter("title").getBytes("ISO8859_1"));
- if(isTrue(req,res,id,name,password)){
- tea.setId(id);
- tea.setName(name);
- tea.setPassword(password);
- tea.setTitle(title);
- tea.update();
- }
- return tea;
- }
-
- public int doDelete(String id) throws SQLException {
- int num=0;
- teacher tea=new teacher();
- num=tea.delete(id);
- return num;
- }
-
- public void sendBean(HttpServletRequest req, HttpServletResponse res,
- teacher tea, String target)
- throws ServletException, IOException {
- req.setAttribute("tea", tea);
- RequestDispatcher rd = getServletContext().getRequestDispatcher(target);
- rd.forward(req, res);
- }
-
-
- public void doError(HttpServletRequest req,
- HttpServletResponse res,
- String str)
- throws ServletException, IOException {
-
- req.setAttribute("problem", str);
- RequestDispatcher rd = getServletContext().getRequestDispatcher("/errorpage.jsp");
- rd.forward(req, res);
- }
-
-
- public boolean hasLogin(HttpServletRequest req, HttpServletResponse res,String id)
- throws ServletException, IOException{
- boolean f=true;
- String message="对不起,该教师号已经被注册过了!";
- teacher tea= new teacher();
- f= tea.hasLogin(id);
- if(f==false){
- doError(req,res,message);
- }
- return f;
- }
-
-
- public boolean isTrue(HttpServletRequest req, HttpServletResponse res,
- String id,String name,String password)
- throws ServletException, IOException {
- boolean f=true;
- String message ="";
- if(id==null || id.equals("")) {
- f=false;
- message="错误,教师号不能为空!";
- doError(req,res,message); }
-
- if(name==null || name.equals("")) {
- f=false;
- message="教师姓名不能为空,请重新填写!";
- doError(req,res,message); }
-
-
- if(password==null || password.equals("")) {
- f=false;
- message="密码不能为空,请重新填写!";
- doError(req,res,message); }
- return f;
-
- }
-
- public void doPost(HttpServletRequest req, HttpServletResponse res)
- throws ServletException, IOException {
- doGet(req, res);
- }
-
-
- }