帮看一下HttpServletRequest的问题！！！

qabp 2004-05-06 05:20:07

public class DepartmentManager {
//...
public void viewByNO(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException{
try{
String depno=request.getParameter("depno");
if (depno==null) request.setAttribute("msg","null!");
else request.setAttribute("msg",depno);
//DepartmentMap dm=new DepartmentMap();
//Department dep=dm.load(depno);
//request.setAttribute("dep",dep);
}catch(Exception e){

}
}
//...
}

public class DepAndDutyServlet extends HttpServlet {
//..
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
depMan.viewByNO(request,response);
}

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

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request,response);
}
//..
}

depno的值传不给DepartmentManager，怎么回事呀？

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qabp 2004-05-11

问题解决了！
不是没setAttribute的问题，是取dep的语句有问题
原来用<jsp:useBean...>改用request.getAttribute()就可以了

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qabp 2004-05-08

可是其他函数可以的呀。你看看我其他几个函数：
public void getAllDepartment(HttpServletRequest request,HttpServletResponse response)
throws javax.servlet.ServletException,java.io.IOException{
try{
String sqlstr="SELECT * from Department ";
String orderstr="ORDER BY DepNo";
DepartmentMap dm=new DepartmentMap();
ArrayList deplist=new ArrayList();
deplist=dm.batchLoad(sqlstr,null,orderstr);
request.setAttribute("deplist",deplist);
}catch(Exception e){
}
}

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zkjbeyond 2004-05-07

depMan.viewByNO(request,response);
我怀疑是request在viewByNO中设置后没有传回。函数里是传值，不是传引用

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qabp 2004-05-07

证实可以把depno传进viewByNo()里，但是request.setAttribute(）不起作用，set了一个String的参数也不行。可是为什么另一个函数中的request.setAttribute(）又可以呢？

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bearr79 2004-05-07

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qabp 2004-05-06

把代码放在servlet里面可以

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qabp 2004-05-06

zkjbeyond(jigi),你改的代码可以在页面中显示传进viewByNO的值吗？
怎么显示不了呢？

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qabp 2004-05-06

duanyuxy123(这几年) ( ),有一个返回所有记录的函数（没贴出来）
没问题。而我贴的这个函数是要从jsp传一个参数depno给servlet再给DepartmentManager的，结果发现传的参数是空的

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zkjbeyond 2004-05-06

我家里没有环境。
controller?action=depshow&redirect=test2&depno=001
你是要提交给这个SERVLET吧。如果没传进去可能不是这段代码的问题。

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zkjbeyond 2004-05-06

public void viewByNO(HttpServletRequest request,HttpServletResponse response){
try{
String depno=request.getParameter("depno");
if (depno==null) response.getWriter().println("null");
else response.getWriter().println("yes");
}catch(Exception e){
}
}

public class DepAndDutyServlet extends HttpServlet {
//..
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
viewByNO(request,response);
}

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

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request,response);
}
//..
}
把方法放到servlet里试一把。