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📁 清华版的jsp基础程序对新手很有用
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        out.println("<BR> server name:");
        String serverName=request.getServerName();
        out.println(serverName);
      // 获取服务器的端口号：
        out.println("<BR> ServerPort:");
        int serverPort=request.getServerPort();
        out.println(serverPort);
       //获取客户端提交的所有参数的名字：
        out.println("<BR>Parameter Names");
        Enumeration enum=request.getParameterNames();
             while(enum.hasMoreElements())
              {String s=(String)enum.nextElement();
                out.println(s);
              }      
     //  文本框text提交的信息:
          out.println("<BR> text:");
          String str=request.getParameter("boy");
                 out.println(str);
       out.println("</BODY>");
       out.println("</HTML>");
    }
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

例子9(效果如图9.11所示)
提交注册名字的JSP页面
Example9_9.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY bgcolor=cyan><Font size=1 >   
  <FORM action="examples/servlet/LoginByServlet" method=post >
     <P>输入你的姓名:
     <INPUT type="text" name="name" value="abc"> 
     <BR>
     <P>输入你的e-mail地址:
      <INPUT type="text" name="address" value="ookk@sina.com"> 
     <P>点击送出按钮：
     <BR>  
     <INPUT TYPE="submit" value="送出" name=submit>
  </FORM>
</FONT>  
</BODY>
</HTML>

sevlet源文件
LoginByServlet.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginByServlet  extends HttpServlet
{  Hashtable hashtable=new Hashtable();
  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public synchronized void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");OutputStream();
       response.setContentType("text/html");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       //获取用户提交的名字：
       String person_name=request.getParameter("name"),
              name_found=null;
         if(person_name==null)
             {person_name="";
             }
        //在散列表查找是否已存在该名字：
        name_found=(String)hashtable.get(person_name);
       if(name_found==null)
          { String person_email=request.getParameter("address");
              if(person_email==null)
                  {person_email="";
                  }
            StringTokenizer fenxi=new StringTokenizer(person_email,"  @");
            int n=fenxi.countTokens();
             if(n>=3)
                 {out.print("<BR>"+"there are exists illegal letters in your email");
                 }
             else
                { hashtable.put(person_name,person_name);
                  out.print("<BR>"+"login success!");
                  out.print("<BR>"+"your name is "+person_name);
                }
          }
        else
          {out.print("<BR>"+"This name has exist ");
          }
       out.println("</BODY>");
       out.println("</HTML>");
    }
 
  public synchronized void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

例子10(效果如图9.12所示)
调用servlet的JSP页面
Example9_10：
<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY bgcolor=cyan>
<A Href="examples/servlet/DateServlet" >查看时间<A>
</BODY>
</HTML>

sevlet源文件
DateServlet.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class DateServlet  extends HttpServlet
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       response.setHeader("Refresh","2");  //设置Refresh的值。
       out.println("Now Time:");
       out.println("<BR>"+new Date());
       out.println("</BODY>");
       out.println("</HTML>");
    }
  public  void  doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

例子11(效果如图9.13所示)
Day.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Day extends HttpServlet
{  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       Calendar calendar=Calendar.getInstance(); //创建一个日历对象。
       calendar.setTime(new Date());//用当前时间初始化日历时间。
       int hour=calendar.get(Calendar.HOUR_OF_DAY),
       minute=calendar.get(Calendar.MINUTE),
       second=calendar.get(Calendar.SECOND);
       if(hour>=22)
           {response.sendRedirect("Night");   //重定向。
           }
        else
           { out.print("Now time :");
             out.print(hour+":"+minute+":"+second);            
           }
      out.println("</BODY>");
      out.println("</HTML>");
    }
 
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

Night.java：
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Night extends HttpServlet
{  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       out.println("<H1> It is time to sleep");
       out.println("</BODY>");
       out.println("</HTML>");
    }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    { 
      doPost(request,response);
    }
}

例子12(效果如图9.14、9.15、9.16所示)
提交文件名字的JSP页面
read.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<%! class FileJSP implements FilenameFilter 
     { String str=null;
         FileJSP(String s)
         {str="."+s;
         }
    public  boolean accept(File dir,String name)
         { return name.endsWith(str);
         }              
     }
%>
<P>下面列出了服务器上的一些jsp文件
 <% File dir=new File("d:/Tomcat/Jakarta-tomcat-4.0/webapps/root/");
   FileJSP file_jsp=new FileJSP("jsp");
   String file_name[]=dir.list(file_jsp);
    for(int i=0;i<5;i++)
           {out.print("<BR>"+file_name[i]);
           }
 %>
 <BR>输入文件的名字读取JSP文件的源代码内容：
  <FORM action="examples/servlet/ReadFileServlet" method=post>
     <Input type="text" name="name">
     <Input type=submit value="提交">
  </FORM>
<BR>输入文件的名字显示该JSP文件的运行效果：
  <FORM action="examples/servlet/ReadFileServlet" method=get>
     <Input type="text" name="name">
     <Input type=submit value="提交">
  </FORM>

读取文件的servlet源文件
ReadFileServlet:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ReadFileServlet extends HttpServlet
{  
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  //doPost方法使用了回压流来读取JSP文件的源代码：
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  //获取提交的文件的名字：
       String name=request.getParameter("name");
        //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       File f=new File("d:/Tomcat/Jakarta-tomcat-4.0/webapps/root",name);
       try{ FileReader in=new FileReader(f) ;
            PushbackReader push=new PushbackReader(in);
            int c; 
            char b[]=new char[1];              
            while ( (c=push.read(b,0,1))!=-1)//读取1个字符放入字符数组b。 
             { String s=new String(b);
                if(s.equals("<"))        //回压的条件  
                {  push.unread('&');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                   push.unread('L');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                   push.unread('T');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                }
            else if(s.equals(">"))        //回压的条件  
               {   push.unread('&');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                   push.unread('G');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                   push.unread('T');
                   push.read(b,0,1); //push读出被回压的字符字节,放入数组b.
                   out.print(new String(b));
                  
               }
            else if(s.equals("\n"))        
              { out.print("<BR>");
              }
            else
               {out.print(new String(b));
               }
           }
          push.close();
        }
      catch(IOException e){}     
       out.println("</BODY>");
       out.println("</HTML>");
    }
  //doGet方法将显示JSP源文件运行的效果
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  String name=request.getParameter("name");
        //获得一个向客户发送数据的输出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//设置响应的MIME类型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       File f=new File("d:/Tomcat/Jakarta-tomcat-4.0/webapps/root",name);
       try{ FileReader in=new FileReader(f) ;
            BufferedReader bufferin=new BufferedReader(in);
            String str=null;  
            while((str=bufferin.readLine())!=null)
               {out.print("<BR>"+str); 
               }
            bufferin.close();
            in.close();
          }
      catch(IOException e){}     
       out.println("</BODY>");
       out.println("</HTML>");
     
    }
}
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