为什么我这两种方法访问的结果会不一样？

Question

不时的。现在我知道前一种是通过servlet响应的。后一种就是jsp

Answer 1

对的，http://localhost:8080/cbserver/orderForm
这是运行Servlet的一种方式，http://localhost:8080/cbserver/orderForm.jsp也可以配置成Servlet来运行的。

Answer 2

哦谢谢~
邦我看看这个吧
http://expert.csdn.net/Expert/topic/1729/1729429.xml?temp=.246319

Answer 3

哦谢谢~
邦我看看这个吧
http://expert.csdn.net/Expert/topic/1729/1729429.xml?temp=.246319

Answer 4

"不时的。现在我知道前一种是通过servlet响应的。后一种就是jsp"
好像不大对阿？我现在有搞糊涂了。http://localhost:8080/cbserver/orderForm这样的地址我怎么知道到底是servlet还是jsp在相应啊？
还有linqi(linqi）你说的：jsp也可以配置成servlet运行的？怎么个配置发啊？？谢谢

Answer 5

我把文件部分贴出来，大家帮我看看吧！
---web.xml
<servlet>
    <servlet-name>Dispatcher</servlet-name>
    <display-name>Dispatcher</display-name>
    <servlet-class>com.sun.cb.Dispatcher</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>RetailPriceListServlet</servlet-name>
    <display-name>RetailPriceListServlet</display-name>
    <servlet-class>com.sun.cb.RetailPriceListServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Dispatcher</servlet-name>
    <url-pattern>/orderForm</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Dispatcher</servlet-name>
    <url-pattern>/checkoutForm</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Dispatcher</servlet-name>
    <url-pattern>/checkoutAck</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RetailPriceListServlet</servlet-name>
    <url-pattern>/loadPriceList</url-pattern>
  </servlet-mapping>
-----orderForm.jsp
<%@ taglib uri="/jstl-c" prefix="c" %>
<%@ taglib uri="/jstl-fmt" prefix="fmt" %>
<%@ page import="java.util.*" %>
<%@ page errorPage="errorpage.jsp" %><form action="<c:out value='${pageContext.request.contextPath}'/>/orderForm" method=post>
<center><table cellpadding=4 cellspacing=2 border=0><tr>
<td colspan=4><fmt:message key="OrderInstructions"/></td>
</tr><tr>
<td colspan=4>
&nbsp;</td>
</tr><tr bgcolor="#CC9999">
<td align="center" colspan=4><font size=5><b><fmt:message key="OrderForm"/><b></font></td>
</tr><tr bgcolor="#CC9999">
<td align=center><B><fmt:message key="Coffee"/></B></td>
<td align=center><B><fmt:message key="Price"/></B></td>
<td align=center><B><fmt:message key="Quantity"/></B></td>
<td align=center><B><fmt:message key="Total"/></B></td>
</tr><c:forEach var="sci" items="${sessionScope.cart.items}" >
<tr bgcolor="#CC9999">
<td><c:out value="${sci.item.coffeeName}" /></td>
<td align=right>$<c:out value="${sci.item.retailPricePerPound}" /></td>
<td align=center><input type="text" name="<c:out value='${sci.item.coffeeName}' />_pounds" value="<c:out value='${sci.pounds}' />" size="3"  maxlength="3"></td> 
<td align=right>$<c:out value="${sci.price}" /></td>
</tr>
</c:forEach><tr>
<td>&nbsp;</td>
<td> 
<a href="<c:out value='${pageContext.request.contextPath}'/>/checkoutForm?firstName=Coffee&lastName=Lover&email=jane@home&areaCode=123&phoneNumber=456-7890&street=99&city=Somewhere&state=CA&zip=95050&CCNumber=1234-2345-5678&CCOption=0"><fmt:message key='Checkout'/></a>
</td>
<td><input type="submit" value="<fmt:message key='Update'/>"></td>
<td align=right>$<c:out value="${sessionScope.cart.total}" /></td>
<td>&nbsp;</td>
</tr><tr>
<td colspan=5><c:out value="${requestScope.orderError}" /></td>
</tr>
</table>
</center>
</form>

Answer 6

邦我分析一下这个代码吧：现在我不懂得是，当我请求http://localhost:8080/cbserver/orderForm这个地址的时候，他来的显示内容格式这种代码我怎么没有发现阿？他这里好像是取得数据阿，没有显示阿，他怎么显示的呢？还有
request.getRequestDispatcher("/template.jsp").forward(request, response);
这行代码试什么意思？？//Dispatcher.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.math.BigDecimal;public class Dispatcher extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response) {   
      HttpSession session = request.getSession();
      ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
      if (messages == null) {
         Locale locale=request.getLocale();
         messages = ResourceBundle.getBundle("com.sun.cb.messages.CBMessages", locale); 
         session.setAttribute("messages", messages);
      }    ServletContext context = getServletContext();
    RetailPriceList rpl = (RetailPriceList)context.getAttribute("retailPriceList");
    if (rpl == null) {
      try {
          rpl = new RetailPriceList();
          context.setAttribute("retailPriceList", rpl);
        } catch (Exception ex) {
          context.log("Couldn't create price list: " + ex.getMessage());
        }
    }
    ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
    if (cart == null) {
        cart = new ShoppingCart(rpl);
        session.setAttribute("cart", cart);
    }
    String selectedScreen = request.getServletPath();
    request.setAttribute("selectedScreen", selectedScreen);    if (selectedScreen.equals("/checkoutForm")) {
      CheckoutFormBean checkoutFormBean = new CheckoutFormBean(cart, rpl, messages);      request.setAttribute("checkoutFormBean", checkoutFormBean);
      try {
        checkoutFormBean.setFirstName(request.getParameter("firstName"));
        checkoutFormBean.setLastName(request.getParameter("lastName"));
        checkoutFormBean.setEmail(request.getParameter("email"));
        checkoutFormBean.setAreaCode(request.getParameter("areaCode"));
        checkoutFormBean.setPhoneNumber(request.getParameter("phoneNumber"));
        checkoutFormBean.setStreet(request.getParameter("street"));
        checkoutFormBean.setCity(request.getParameter("city"));
        checkoutFormBean.setState(request.getParameter("state"));
        checkoutFormBean.setZip(request.getParameter("zip"));
        checkoutFormBean.setCCNumber(request.getParameter("CCNumber"));
        checkoutFormBean.setCCOption(Integer.parseInt(request.getParameter("CCOption")));
      } catch (NumberFormatException e) {
        // not possible
      }
    }
    try {
        request.getRequestDispatcher("/template.jsp").forward(request, response);
    } catch(Exception ex) {
      ex.printStackTrace();
    }
  }
  public void doPost(HttpServletRequest request, HttpServletResponse response) {
    HttpSession session = request.getSession();
    ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
    String selectedScreen = request.getServletPath();
    request.setAttribute("selectedScreen", selectedScreen);    ServletContext context = getServletContext();
    RetailPriceList rpl = (RetailPriceList)context.getAttribute("retailPriceList");
    if (rpl == null) {
      try {
          rpl = new RetailPriceList();
          context.setAttribute("retailPriceList", rpl);
        } catch (Exception ex) {
          context.log("Couldn't create price list: " + ex.getMessage());
        }
    }
    ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
    if (cart == null ) {
        cart = new ShoppingCart(rpl);
        session.setAttribute("cart", cart);
    }
 
    if (selectedScreen.equals("/orderForm")) {
      cart.clear();
      for(Iterator i = rpl.getItems().iterator(); i.hasNext(); ) {
        RetailPriceItem item = (RetailPriceItem) i.next();
        String coffeeName = item.getCoffeeName();
        BigDecimal pounds = new BigDecimal(request.getParameter(coffeeName + "_pounds"));
        BigDecimal price = item.getRetailPricePerPound().multiply(pounds).setScale(2, BigDecimal.ROUND_HALF_UP);
        ShoppingCartItem sci = new ShoppingCartItem(item, pounds, price);
        cart.add(sci);
      }    } else if (selectedScreen.equals("/checkoutAck")) {
      CheckoutFormBean checkoutFormBean = new CheckoutFormBean(cart, rpl, messages);      request.setAttribute("checkoutFormBean", checkoutFormBean);
      try {
        checkoutFormBean.setFirstName(request.getParameter("firstName"));
        checkoutFormBean.setLastName(request.getParameter("lastName"));
        checkoutFormBean.setEmail(request.getParameter("email"));
        checkoutFormBean.setAreaCode(request.getParameter("areaCode"));
        checkoutFormBean.setPhoneNumber(request.getParameter("phoneNumber"));
        checkoutFormBean.setStreet(request.getParameter("street"));
        checkoutFormBean.setCity(request.getParameter("city"));
        checkoutFormBean.setState(request.getParameter("state"));
        checkoutFormBean.setZip(request.getParameter("zip"));
        checkoutFormBean.setCCNumber(request.getParameter("CCNumber"));
        checkoutFormBean.setCCOption(Integer.parseInt(request.getParameter("CCOption")));
      } catch (NumberFormatException e) {
        // not possible
      }
      if (!checkoutFormBean.validate())
        request.setAttribute("selectedScreen", "/checkoutForm");
    }    try {
        request.getRequestDispatcher("/template.jsp").forward(request, response);
    } catch(Exception e) {
    }
  }
}