原本一開始一照上面所寫的照做.....不過他就會一直出現 HTTP 405錯誤~~經過了上網查資料後發現!原來在" dopost " 那裡要改成 " service " 這樣才可以執行....找了一天的蟲○○→↘
(在Beer.htm中method="post" 不行再改 不過通程式可以 method="get")↙↘
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Beer.htm
------------------------

啤酒選擇

選出想喝的啤酒

顏色:

light
amber
brown
dark

=============
BeerExpert.java
-----------------------
package model;
import java.util.*;

public class BeerExpert{
public List getBrands(String color){
List brands=new ArrayList();
if(color.equals("amber")){
brands.add("Jack Amber");
brands.add("Red Moose");
}
else {
brands.add("Jail Pale Ale");
brands.add("Gout Stout");
}
return (brands);
}
}
==============
BeerSelect.java
------------------------------
import model.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class BeerSelect extends HttpServlet{
public void dopost(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException{
String c=request.getParameter("color");
BeerExpert be=new BeerExpert();
List result=be.getBrands(c);
request.setAttribute("styles",result);
RequestDispatcher view=request.getRequestDispatcher("result.jsp");
view.forward(request,response);
}
}
還有一個JSP網頁沒列出~不過問題不在這裡@@"