帮看一下HttpServletRequest的问题！！！

[qabp]

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？

[qabp]

好象就没传进servlet

[qabp]

controller?action=depshow&redirect=test2&depno=001

[duan123]

DepartmentManager是servlet吗？

[qabp]

传进servlet了！
可是从servlet传不出去？
不传值给DepartmentManager的函数执行正常！

[qabp]

不是，是一个Bean

[qabp]

class

[duan123]

不传值给DepartmentManager的函数执行正常！


这句话是什么意思？

[wlzxgdut]

关注！

[zkjbeyond]

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。

[zkjbeyond]

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。

[qabp]

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

[qabp]

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？

[qabp]

把代码放在servlet里面可以

[bearr79]

up

[qabp]

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？

[zkjbeyond]

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

[qabp]

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){
}
}

[qabp]

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