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?? 清華版的jsp基礎程序對新手很有用
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import javax.servlet.http.*;
public class Boy extends HttpServlet
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //獲得一個向客戶發送數據的輸出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       HttpSession session=request.getSession(true);  //獲取客戶的會話對象
                   session.setAttribute("name","Zhoumin");
       out.println(session.getId());                  //獲取會話的Id.
        out.println("</BODY>");
       out.println("</HTML>");
    }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

Girl.java：
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Girl extends HttpServlet
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //獲得一個向客戶發送數據的輸出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       HttpSession session=request.getSession(true);  //獲取客戶的會話對象
                   session.setAttribute("name","Zhoumin");
       out.println(session.getId());                  //獲取會話的Id.
       String s=(String)session.getAttribute("name"); //獲取會話中存儲的數據。
       out.print("<BR>"+s);
       out.println("</BODY>");
       out.println("</HTML>");
    }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

例子17(效果如圖9.20、9.21所示)
負責選擇商品的JSP頁面
choice.jsp:
<%@ page contentType="text/html;charset=GB2312" %> 
<%@ page import="java.util.*" %>
<%@ page import="Car1" %> 
<HTML>
<BODY bgcolor=cyan><Font size=1>
<P>這里是第一百貨商場，選擇您要購買的商品添加到購物車：
<FORM action="examples/servlet/AddCar" method=post name=form>
       <Select name="item"  value="沒選擇">
          <Option value="TV">電視機
          <Option value="apple">蘋果
          <Option value="coke">可口可樂
          <Option value="milk">牛奶
          <Option value="tea">茶葉
       </Select> 
<P>輸入購買的數量:
    <Input type=text name="mount">
<P>選擇計量單位：
   <INPUT type="radio" name="unit" value="個">個 
   <INPUT type="radio" name="unit" value="公斤">公斤
   <INPUT type="radio" name="unit" value="臺">臺 
   <INPUT type="radio" name="unit" value="瓶">瓶 
<Input type=submit value="提交添加">
</FONT>
</BODY>
</HTML>

負責添加商品的servlet
AddCar.java:
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class AddCar extends HttpServlet
{  
   public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //獲得一個向客戶發送數據的輸出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       HttpSession session=request.getSession(true);  //獲取客戶的會話對象
       String item =request.getParameter("item"),      //獲取客戶選擇的商品名稱。
              mount=request.getParameter("mount"),    //獲取客戶購買的數量。
              unit =request.getParameter("unit");     //獲取商品的計量單位。 
       //將客戶的購買信息存入客戶的session對象中。
        String str="Name: "+item+"  Mount:"+mount+"  Unit:"+unit;
               session.setAttribute(item,str); 
       //將購物車中的商品顯示給客戶：
       out.println(" goods in your car: ");
            Enumeration enum=session.getAttributeNames();
             while(enum.hasMoreElements())
               { String name=(String)enum.nextElement();
                 out.print("<BR>"+(String)session.getAttribute(name));
               } 
     }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

選擇刪除商品的JSP頁面
remove.jsp：
<%@ page contentType="text/html;charset=GB2312" %> 
<%@ page import="java.util.*" %>
<%@ page import="Car1" %> 
<HTML>
<BODY bgcolor=cyan><Font size=1>
<P>選擇要從購物車中刪除的商品：
<FORM action="examples/servlet/RemoveGoods" method=post name=form>
       <Select name="item"  value="沒選擇">
          <Option value="TV">電視機
          <Option value="apple">蘋果
          <Option value="coke">可口可樂
          <Option value="milk">牛奶
          <Option value="tea">茶葉
       </Select> 
<Input type=submit value="提交刪除">
</FONT>
</BODY>
</HTML>

負責刪除商品的servlet
RemoveGoods.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class RemoveGoods extends HttpServlet
{public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //獲得一個向客戶發送數據的輸出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       HttpSession session=request.getSession(true);  //獲取客戶的會話對象
       String item =request.getParameter("item");      //獲取要刪除的商品名稱。
              session.removeAttribute(item);       //刪除商品。
        //將購物車中的商品顯示給客戶：
       out.println("<H3>Now goods in your car:</H3> ");
            Enumeration enum=session.getAttributeNames();
             while(enum.hasMoreElements())
               { String name=(String)enum.nextElement();
                 out.print("<BR>"+(String)session.getAttribute(name));
               } 
     }
public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

servlet源文件
GetNumber.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetNumber extends HttpServlet 
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  response.setContentType("text/html");  
       ServletOutputStream out=response.getOutputStream();
       out.print("A number between 1 and 100 to you,guess it out please! ");
       HttpSession session=request.getSession(true);
       session.setAttribute("count",new Integer(0));
       int number=(int)(Math.random()*100)+1;        //獲取一個隨機數。
       session.setAttribute("save",new Integer(number));
       out.print("<FORM action=Result  method=post name=form>");
       out.print("<INPUT type=text name=boy >");
       out.print("<INPUT type=submit value=Enter>");
       out.print("</FORM>");
    } 
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

Result.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Result extends HttpServlet 
{ public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  response.setContentType("text/html");  
       ServletOutputStream out=response.getOutputStream();
       HttpSession session=request.getSession(true);
       String str=request.getParameter("boy");
      if(str==null) 
        {str="0";
        }
      int guessNumber=Integer.parseInt(str);
      Integer integer=(Integer)session.getAttribute("save");
      int realnumber=integer.intValue();
     if(guessNumber==realnumber)
        { int n=((Integer)session.getAttribute("count")).intValue();
          n=n+1;
          session.setAttribute("count",new Integer(n));
           response.sendRedirect("Success");
        } 
       else if(guessNumber>realnumber)
        { int n=((Integer)session.getAttribute("count")).intValue();
          n=n+1;
          session.setAttribute("count",new Integer(n));
          response.sendRedirect("Larger");
        }
    else if(guessNumber<realnumber)
        { int n=((Integer)session.getAttribute("count")).intValue();
          n=n+1;
          session.setAttribute("count",new Integer(n));
          response.sendRedirect("Smaller");
        }
    } 
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

Larger.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Larger extends HttpServlet 
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  response.setContentType("text/html");  
       ServletOutputStream out=response.getOutputStream();
       out.print("Larger ,try again!"); //所猜的數比實際的數大，請再猜。
       out.print("<BR><FORM action=Result  method=post name=form>");
       out.print("<INPUT type=text name=boy >");
       out.print("<INPUT type=submit value=Enter>");
       out.print("</FORM>");
    } 
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

Smaller.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Smaller extends HttpServlet 
{  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  response.setContentType("text/html");  
       ServletOutputStream out=response.getOutputStream();
       out.print("Smaller ,try again!"); //所猜的數比實際的數小，請再猜。
       out.print("<BR><FORM action=Result  method=post name=form>");
       out.print("<INPUT type=text name=boy >");
       out.print("<INPUT type=submit value=Enter>");
       out.print("</FORM>");
    } 
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}

Success.java
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Success extends HttpServlet 
{  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  response.setContentType("text/html");  
       ServletOutputStream out=response.getOutputStream();
       HttpSession session=request.getSession(true);
       int count=((Integer)session.getAttribute("count")).intValue();
       int num=((Integer)session.getAttribute("save")).intValue();
       long startTime=session.getCreationTime();
       long endTime=session.getLastAccessedTime();
       long spendTime=(endTime-startTime)/1000;
       out.println("Congratulatuon! You are right");
       out.println("afer just"+count+"tries") ;
       out.println("you spend"+spendTime+"Seconds");
       out.println("That Number is"+num);
    } 
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { doPost(request,response);
    }
}
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