📄 del.jsp

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💻 JSP
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<%@ page contentType="text/html;charset=gb2312" %>
<%@page import="java.io.*" %>
<%@page import="java.util.*" %>
<html>
  <body>
    <%!
      Hashtable hashtable=new Hashtable();
      synchronized void removeGoodsToHashtable(String key){
        hashtable.remove(key);
      }
      synchronized void putGoodsToHashtable(String key,String list){
        hashtable.put(key,list);
      }
     %>
     <%
       String name=null,delete="";
       String oldname=(String)session.getAttribute("name");
       out.print("<br>输入要删除货物的货号：");
       out.print("<form action=del.jsp method=get>");
       out.print("<p>货号：");
       out.print("<input type=text name=N value="+oldname+">");
       out.print("<input type=submit name=del value=del>");
       out.print("</form>");
       name=request.getParameter("N");
       delete=request.getParameter("del");
       if(name==null)
         name="have no any goods number";
       byte c[]=name.getBytes("ISO-8859-1");
       name=new String(c);
       if(delete!=null){
         if(delete.startsWith("del")){
           try{
             File f=new File("D:/jsp2007","goods_name.txt");
             FileInputStream in=new FileInputStream(f);
             ObjectInputStream object_in=new ObjectInputStream(in);
             hashtable=(Hashtable)object_in.readObject();
             object_in.close();
             in.close();
             if(hashtable.containsKey(name)){
                removeGoodsToHashtable(name);
                out.print("<br>"+"货号："+name+"的信息被删除");
                FileOutputStream o=new FileOutputStream(f);
                ObjectOutputStream object_out=new ObjectOutputStream(o);
                object_out.writeObject(hashtable);
                object_out.close();
                o.close();
             }else{
                out.print("<br>"+"没有货号："+name+"记录");
             }
          }catch(IOException ee){
          }
        }
       }
      %>
      <table border="2">
        <tr>
         <td>
          <form action="Example4_11.jsp" method="post">
            <input type="submit" value="录入界面">
          </form>
         </td>
         <td>
          <form action="showgoods.jsp" method="post">
            <input type="submit" value="查看界面">
          </form>
         </td>
         <td>
          <form action="del.jsp" method="post">
            <input type="submit" value="修改界面">
          </form>
        </td>
       </tr>
       </table>
  </body>
</html>
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