麻烦我解释解释代码

Question

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312"); //定义响应头
PrintWriter out = response.getWriter(); //获取打印流。
CodeChange code=new CodeChange();//实例化一个对象
HttpSession session=request.getSession();//获取当前用户的session
String action=request.getParameter("action");//获取请求的标识，和其他的表单参数没区别
String name=request.getParameter("name");//用户名
String psw=request.getParameter("pwd");//密码
session.setAttribute("name", name);//用户名放到session中
if(action.equals("index")){//判断标识，做出具体的操作
String idStr=request.getParameter("choose");//获取一个前提传过来的值 
　　　　　if(idStr.equals("0")){//验证用户名密码 。0是管理员
if(name.equals("admin")&&psw.equals("admin")){
request.getRequestDispatcher("/adminManager/main.jsp").forward(request, response);//成功后转发到adminManager/main.jsp
}else{
request.getRequestDispatcher("failed.html").forward(request, response);//失败转发到 错误页面
}
}else if(idStr.equals("1")){//1是学生？
StudentInf st=new StudentInf();//实例化一个对象
st.setStu_ID(code.getString(name));//赋值 名字st.setStu_password(code.getString(psw));//赋值 密码
StudentDAO sdao=new StudentDAO();
if(sdao.searchStu(st)){//验证上变的用户，和密码
String stu_ID=st.getStu_ID();
StudentInf stu=sdao.searchStuById(stu_ID);
session.setAttribute("stu_id", code.getString(name));
session.setAttribute("stu_name", stu.getStu_name());
request.getRequestDispatcher("/studentManager/stu_main.jsp").forward(request, response);//验证成功转发
}else{
request.getRequestDispatcher("failed.html").forward(request, response);//失败 转发到错误页面
}
}else{//其他就是教师
TearcherInf ad=new TearcherInf();
ad.setTearcher_ID(code.getString(name));
ad.setPassword(code.getString(psw));
TearcherDAO tdao=new TearcherDAO();
if(tdao.searchTear(ad)){
session.setAttribute("tearcherID", ad.getTearcher_ID());
session.setAttribute("password", ad.getPassword());
request.getRequestDispatcher("/tearcherManager/tearcher_main.jsp").forward(request, response);
}else{//这块没啥用   不会走 。
request.getRequestDispatcher("failed.html").forward(request, response);
}
}
}
}

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Answer 2

servlet中的代码
接受4个前台的参数action，name，pwd，choos
把name存入session里
如果action==index
判断choose是否是0，判断是否是admin登录，
如果是admin登录跳到adminManager/main.jsp否则跳到错误页面
choose是1跳到根据id查找这个student判断在跳到("/studentManager/stu_main.jsp，并存入session中
如果是老师查找teach存入session跳转("/tearcherManager/tearcher_main.jsp
,
这是你业务层的代码，主要是看你业务中要做什么功能！！