jsp网上书店网页设计 第6页

jsp网上书店网页设计 第6页
          }
优．public String getString(String s)
     { if(s==null) s="";
       try {byte a[]=s.getBytes("ISO-8859-1");
            s=new String(a);
           }
       catch(Exception e)
           { }
       return s;
     }
 %>
<% 
    String username=request.getParameter("username");
           username=getString(username);
 
    String password=request.getParameter("password");
           password=getString(password);

    String password1=request.getParameter("password1");
           password1=getString(password1);

    String password2=request.getParameter("password2");
       password2=getString(password2);
   
    Statement sql=null;
    ResultSet rs=null;
    boolean modify=false;
    boolean ifEquals=false;
            ifEquals=(password1.equals(password2))&&(password1.length()<=20)&&(password1.length()>=6);
    if(ifEquals==true)
        {try
           {    Connection con;
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
         con=DriverManager.getConnection("jdbc:odbc:shop","root","123456");
               sql=con.createStatement();
               String condition="SELECT * FROM users WHERE username = "+"'"+username+"'";
               rs =sql.executeQuery(condition);
               while(rs.next())
                 { String n=rs.getString("username");
                   String s=rs.getString("password");
                   if(username.equals(n)&&password.equals(s))
                    { 
                     modify=true;
                     out.print("<h3>密码修改成功！");
                     String c=
         "UPDATE users SET password = "+"'"+password1+"'"+" WHERE username = "+"'"+username+"'";
                     rs =sql.executeQuery(c);
                    }
                  }
           }
         catch(Exception ex) { ex.printStackTrace();}
        }
    else
   { out.print("<h3>两次密码输入不一致或新密码长度不够！");
       }
    if(modify==false&&ifEquals==true)
     { out.print("<br><h3>用户名或旧密码输入错误，请重新输入。");
     }
七．
public String getString(String s)
    { String str=s;
       try{ byte b[]=str.getBytes("ISO-8859-1");
            str=new String(b);
            return str;
     }
   catch(Exception e)
         { return str;
         }
    }
%>
  <%  //获取提交的用户名：
    String username=request.getParameter("username");
       if(username==null)
            {username=" ";
             }
      username=getString(username);
    //获取提交的密码：
    String password=request.getParameter("password");
       if(password==null)
            {password=" ";

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