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📁 清华版的jsp基础程序 对新手很有用
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</HTML>
例子10(效果如图4.11、4.12所示)
Example4_10.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<HTML>
<BODY>
 <P> 在下面的表格输入成绩:
 <FORM action="Example4_10.jsp" method=post name=form>
  <Table align="CENTER" Border>
     <TR>
            <TH  width=50> 姓名</TH>
            <TH  width=50> 数学</TH>
            <TH  width=50>英语</TH>
     </TR>
    <% int i=0;
       while(i<=6)
         {out.print("<TR>");
             out.print("<TD>");
                 out.print("<INPUT type=text name=name value=姓名>");
             out.print("</TD>");
             out.print("<TD>");
                 out.print("<INPUT type=text name=math value=0>");
             out.print("</TD>");
             out.print("<TD>");
                 out.print("<INPUT type=text name=english value=0>");
             out.print("</TD>");
          out.print("</TR>");
          i++;
        }
     %>
     <TR>
        <TD>
         <INPUT type=submit name="g" value="写入成绩" >
        </TD>
        <TD> Math</TD>
        <TD> English</TD>
     </TR>  
   </Table>
  </FORM>
  <% 
     String name[]=request.getParameterValues("name");
     String math[]=request.getParameterValues("math");
     String english[]=request.getParameterValues("english");
    try{ File f=new File("f:/2000","student.txt");
         FileOutputStream o=new FileOutputStream(f);
         DataOutputStream DataOut=new DataOutputStream(o);
         for(int k=0;k<name.length;k++)
          {DataOut.writeUTF(name[k]);
           DataOut.writeUTF(math[k]);
           DataOut.writeUTF(english[k]);
          }
        DataOut.close();
        o.close();
      } 
    catch(IOException e)
      {      }
    catch(NullPointerException ee)
     {     }
  %>
 <P><BR>查看成绩单:
  <A href=showresult.jsp><BR> 连接到成绩单页面>
</BODY>
</HTML>

showresult.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<HTML>
<BODY>
 <P>成绩单:
 <% try{ File f=new File("f:/2000","student.txt");
         FileInputStream in=new FileInputStream(f);
         DataInputStream DataIn=new DataInputStream(in);
         String name="ok";
         String math="0",english="0";
       out.print("<Table Border>");
           out.print("<TR>");
               out.print("<TH  width=50> 姓名</TH>");
               out.print("<TH  width=50> 数学</TH>");
               out.print("<TH  width=50>英语</TH>");
           out.print("</TR>");
           while((name=DataIn.readUTF())!=null)
             { byte bb[]=name.getBytes("ISO-8859-1");
               name=new String(bb);
               math=DataIn.readUTF();
               english=DataIn.readUTF();
               out.print("<TR>");
                  out.print("<TD width=200>");
                  out.print(name);
                  out.print("</TD>"); 
                  out.print("<TD width=100>");
                  out.print(math);
                  out.print("</TD>"); 
                  out.print("<TD width=100>");
                  out.print(english);
                  out.print("</TD>");
               out.print("</TR>");  
             }
        out.print("</Table>");
        DataIn.close();  in.close();
     }
    catch(IOException ee)
     {     }
  %>
</BODY>
</HTML>

例子11(效果如图4.13、4.14所示)
Example4_11.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<%@ page import ="java.util.*" %>
<HTML>
<BODY>
 <P> 输入货物有关信息:
  <FORM action="input.jsp" method=post >
    <P>货号:
      <INPUT type=text name="N">
    <P>数量:
      <INPUT type=text name="M">
    <BR>
      <INPUT type=submit value="提交">  
  </FORM>
  <FORM action="showgoods.jsp" method=post >
    <P>查看库存情况
      <BR>
      <INPUT type=submit value="去查看库存">  
  </FORM>
</BODY>
</HTML>

input.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<%@ page import ="java.util.*" %>
<HTML>
<BODY> 
  <%! //声明创建一个散列表对象,被所有的客户共享:
      Hashtable hashtable=new Hashtable();
      //一个向散列表填加信息的同步方法:     
      synchronized void putGoodsToHashtable(String key,String list)
        {hashtable.put(key,list);
        }
       //从散列表移去信息的同步方法:
      synchronized void removeGoodsToHashtable(String key)
        {hashtable.remove(key);
        }
  %>
<%--获取客户提交的书号名字和数量--%> 
 <%   String name=request.getParameter("N");
         if(name==null)
             {name="have no any goods number";
             }
          byte  c[]=name.getBytes("ISO-8859-1");
          name=new String(c); 
         String mount=request.getParameter("M");
         if(mount==null)
             {mount="have no any recoder";
             }
          byte  d[]=mount.getBytes("ISO-8859-1");
          mount=new String(d); 
   %>
<%--从文件中读散列表,如果文件不存在,你就是第一个录入的人,负责写散列表到文件--%>
  <%File f=new File("F:/2000","goods_name.txt");
   if(f.exists())
       { try{FileInputStream in=new FileInputStream(f);
            ObjectInputStream object_in=new ObjectInputStream(in);
            hashtable=(Hashtable)object_in.readObject();
            object_in.close();
            in.close(); 
            String temp=(String)hashtable.get(name);
            if(temp==null)
              {temp="";
              }
           if((temp.length())!=0)
              { out.print("<BR>"+"该货号已经存在,您已经修改了数量");
                 String s="货号:"+name+" ,数量:"+mount;
                  removeGoodsToHashtable(name); //首先移去旧的信息。           
                  putGoodsToHashtable(name,s);  //填加新的信息。
                    //将新的散列表写入到文件:
                    try{FileOutputStream o=new FileOutputStream(f);
                        ObjectOutputStream object_out=new ObjectOutputStream(o);
                        object_out.writeObject(hashtable);
                        object_out.close();
                        o.close();
                       }
                    catch(Exception eee)
                      {   }
              }
            else
              {String s="货号:"+name+" ,数量:"+mount;
               putGoodsToHashtable(name,s); //向散列表填加新的货物信息。
                   //再将新的散列表写入到文件:
                    try{FileOutputStream o=new FileOutputStream(f);
                        ObjectOutputStream object_out=new ObjectOutputStream(o);
                        object_out.writeObject(hashtable);
                        object_out.close();
                        o.close();
                       }
                    catch(Exception eee)
                      {    }
                out.print("<BR>"+"您已经将货物存入文件");
                out.print("<BR>"+"货物的货号:"+name);
              }
          }
        catch(IOException e) {}
       }    
else
     { //如果文件不存在,您就是第1个录入信息的人。
          String s="货号:"+name+"数量:"+mount;
          putGoodsToHashtable(name,s);//放信息到散列表。
               //负责创建文件,并将散列表写入到文件:
                  try{ FileOutputStream o=new FileOutputStream(f);
                      ObjectOutputStream object_out=new ObjectOutputStream(o);
                      object_out.writeObject(hashtable);
                      object_out.close();
                      o.close();
                      out.print("<BR>"+"您是第一个录入货物的人");
                      out.print("<BR>"+"货物的货号:"+name);
                     }
                    catch(Exception eee)
                     {   }
    }
   %>
<FORM action="showgoods.jsp" method=post >
    <P>查看库存情况
      <BR> <INPUT type=submit value="去查看库存">  
  </FORM>
<A href="Example4_11.jsp"><BR>返回录入页面
</BODY>
</HTML>

showgoods.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<%@ page import ="java.util.*" %>
<HTML>
<BODY>
  <P> 已有货物的有关信息:
   <% 
      try{File f=new File("F:/2000","goods_name.txt");
          FileInputStream in=new FileInputStream(f);
          ObjectInputStream object_in=new ObjectInputStream(in);
         Hashtable  hashtable=(Hashtable)object_in.readObject();
          object_in.close();
          in.close(); 
          Enumeration enum=hashtable.elements(); 
             while(enum.hasMoreElements())   //遍历当前散列表。
             { String goods=(String)enum.nextElement();
              out.print("<BR>"+"货号及库存:"+goods);
             }
         hashtable.clear();
         }
      catch(ClassNotFoundException event)
           { out.println("无法读出");
           }
      catch(IOException event)
            {out.println("无法读出");
            }
   %>
<A href="Example4_11.jsp"><BR>返回录入页面
</BODY>
</HTML>

例子12(效果如图4.15、4.16、4.17所示)
Example4_12.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<HTML>
<BODY bgcolor=cyan><Font size=1>
<% String str=response.encodeURL("continueWrite.jsp");
%>
 <P>选择您想续写小说的名字:<BR>
   <FORM action="<%=str%>" method=post name=form>
     <BR><INPUT type="radio" name="R" value="spring.doc" >美丽的故事
     <BR><INPUT type="radio" name="R" value="summer.doc" >火热的夏天   
     <BR><INPUT type="radio" name="R" value="autumn.doc" >秋天的收获
     <BR><INPUT type="radio" name="R" value="winter.doc" >冬天的大雪 
    <BR>  <INPUT type=submit name ="g" value="提交">  
  </FORM>
 </BODY>
</HTML>

continueWrite.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<HTML>
<BODY bgcolor=cyan><Font size=1>
<P>小说已有内容:
<Font size=1 Color=Navy>
<%String str=response.encodeURL("continue.jsp");
%>
<%--获取客户提交的小说的名字--%>
 <%String name=(String)request.getParameter("R");
              if(name==null)
              {name="";
              }
       byte  c[]=name.getBytes("ISO-8859-1");
       name=new String(c); 
    session.setAttribute("name",name);
    File storyFileDir=new File("F:/2000","story");
    storyFileDir.mkdir();
     File f=new File(storyFileDir,name);  
    //列出小说的内容:
        try{ RandomAccessFile file=
             new RandomAccessFile(f,"r");
             String temp=null;
             while((temp=file.readUTF())!=null)
                {  byte  d[]=temp.getBytes("ISO-8859-1");
                  temp=new String(d); 
                  out.print("<BR>"+temp);
                }
             file.close();
           }
        catch(IOException e){}
 %> 
 </Font>
 <P>请输入续写的新内容:
  <Form action="<%=str%>" method=post name=form>
    <TEXTAREA name="messages" ROWs="12" COLS=80 WRAP="physical">
    </TEXTAREA>
    <BR>
    <INPUT type="submit" value="提交信息" name="submit">
  </FORM>
 
continue.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<%@ page import ="java.util.*" %>

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