最进整理了，一些学习过程中的笔记，拿出来跟大家分享，本人决无炫耀之意，只是希望能对各位有点帮助！
1 表单的另一种参数传递方法：
<form name="form1<%=id%>" method="post" action="bookOrder.jsp?bookid=<%=id%>">
<img src="images/all1.gif" width="40" height="40" onClick="submit()"></form>
2 防止为登陆浏览：
if(session.getAttribute("UserName")==null||session.getAttribute("UserName")=="")
{
out.println("<Script language=´javascript´>");
out.println("alert(´对不起！请你登陆后再订阅´)");
out.println("history.go(-1)");
out.println("</script>");
}
else
{
%>
3验证 用户信息的合法性：
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="bookM" scope="page" class="date.SearchBookCar" />
<%! String bookid,bookNumS; int Id,bookNumI;
%>
<%
bookid=request.getParameter("bookid");//得到ID
bookNumS=request.getParameter("bookfield");//得到数量
if(bookNumS!=""&bookNumS!=null)
{
try
{
bookNumI=Integer.parseInt(bookNumS);//转换成int类型
Id=Integer.parseInt(bookid) ;
}
catch(NumberFormatException e)
{
out.println("<Script language=´javascript´>");
out.println("alert(´对不起,您输入的数字格式不对!´)");
out.println("history.back(-1)");
out.println("</script>");
}
boolean one=bookM.bookQuery(Id,bookNumI,""+session.getAttribute("loginTime"),""+session.getAttribute("UserName"));
if(one)
{
out.println("<Script language=´javascript´>");
out.println("alert(´提交成功!´)");
out.println("history.back(-1)");
out.println("</script>");
}
else
{
out.println("<Script language=´javascript´>");
out.println("alert(´您已经订过此书！´)");
out.println("history.back(-1)");
out.println("</script>");
}
}
bookM.bclose();
}%>
4表单的检验
<form action="search.jsp" name="search_form" methor="post">
<input type="submit" name="Submit3" value="确定" onclick=search_sub()>
<script language="javascript">
function search_sub()
{
if(document.search_form.keyword.value==""|document.search_form.keyword.value=="请输入关键字")
{
window.alert("请输入关键字!");
document.search_form.keyword.focus();
return;
}
else
{
document.search_form.submit();
}
}
5搜索的sql代码：
String strSQL="Select * from hotbook";
if(way!=null&&keyword!=null)
{
//////////////出版社********************
if(way.trim().equals("3"))
{
strSQL="SELECT * FROM hotbook where";
strSQL=strSQL+" 出版社 like "+"´%"+keyword+"%´";
}
//////////////出版日期********************
if(way.trim().equals("4"))
{
strSQL="SELECT * FROM hotbook where";
strSQL=strSQL+" 出版日期 like ´%"+keyword+"%´";
}
//////////////书名********************
if(way.trim().equals("1"))
{
strSQL="SELECT * FROM hotbook where";
strSQL=strSQL+" 书名 like ´%"+keyword+"%´";
}
//////////////作者********************
if(way.trim().equals("2"))
{
strSQL="SELECT * FROM hotbook where";
strSQL=strSQL+" 作者 like ´%"+keyword+"%´";
}
//////////////ISBN********************
if(way.trim().equals("5"))
{
strSQL="SELECT * FROM hotbook where";
strSQL=strSQL+" ISBN like ´%"+keyword+"%´";
}
}
6分页显示
if (strSQL!=null)
{
Connection con=yy.getConn();
Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet RSa=stmt.executeQuery(strSQL);
RSa.last();
int qikan_num=0;//每页实际页数
int pageNO=1;//第几页
int pageRecorders=5;//每页10条记录
int pageTotal=RSa.getRow();//共几条
int pageCount=pageTotal/pageRecorders;//每页10条共几页
String strPage = request.getParameter("pagenum");//得到传递上来的页数
if(strPage==null)
{
//表明在QueryString中没有page这一个参数，此时显示第一页数据
pageNO = 1;
}
else
{
//将字符串转换成整型
pageNO= java.lang.Integer.parseInt(strPage);
if(pageNO<1)
{pageNO = 1;}
}
if(pageCount>=0)
{
//将记录指针定位到待显示页的第一条记录//的前一条上
if((pageNO-1)==0)//如果为第一页，则指向第0条
{
RSa.beforeFirst();//如果为第一条记录，
}
else RSa.absolute((pageNO-1) * pageRecorders);//如果为其它，则指向当前条的下一条
}
%>
<table width="772" border="0">
<tr>
<td width="120"><%if (session.getAttribute("UserName")!=null)
{ out.println("<font color=red>欢迎您："+session.getAttribute("UserName")+"</font>");}
else
{ out.println("<font color=red>请您登陆!</font>"); };%>
</td>
<%if(pageNO<=pageCount){%>
<td width="128">
<a href="../search.jsp?pagenum=<%=pageNO+1%>&keyword=<%=keyword%>&way=<%=way%>">下一</a></td>
<%}%>
<%if(pageNO>1){%>
<td width="124">
<a href="../search.jsp?pagenum=<%=pageNO-1%>&keyword=<%=keyword%>&way=<%=way%>">上一</a></td>
<%}%>
<td width="124"> </td>
<td width="124"><a href="search.jsp">查看全部热点书</a></td>
<td width="126"><a href="myorder.jsp" target="_blank">查看我的订单</a></td>
</tr>
</table>
</td>
</tr>
</table>
<table width="660" border=0 align="center" cellpadding=6 cellspacing=0 class=linehight height="123">
<%
while( RSa.next()&&qikan_num<pageRecorders)
{
String bookname= RSa.getString("书名");
String writer=RSa.getString("作者");
float sale2=RSa.getFloat("定价");
String pubname= RSa.getString("出版社");
String pubtime= RSa.getString("出版日期");
int bookid= RSa.getInt("id");
String image= RSa.getString("ISBN");
%>
<tr>
<td align=middle width="23%" height=16><a href=javascript:show("../search_info.jsp?id=<%=bookid%>","详细资料",600,300)><img src="image/hotbook/<%=image%>.jpg" border="0"></a></td>
<td valign=top width="58%" ><b>书名:</b><a href=javascript:show("../search_info.jsp?id=<%=bookid%>","详细资料",600,300)><font color="#cc0000"><b><%= bookname%></b></font></a><br>
<b><br>作者:</b><%=writer%><br>
<b>定价:</b><font color="#cc0000"> ￥<%=sale2%></font><br>
<b>出版社:</b><%=pubname%><br>
<b>出版日期:</b><%=pubtime%></td>
<td valign=bottom width="19%" height=16 >
<form name="form1<%=bookid%>" method="post" action="bookTiqiao.jsp?bookid=<%=bookid%>">
<input type="text" name="bookfield" size="3" maxlength="3" value="1">
本<img src="images/all1.jpg" width="41" height="36" onClick="submit()" style="cursor:hand">
</form>
</td>
</tr>
<tr align=middle>
<td valign=top colspan=3 height=0>
<div align="right"><img src="images/search_end.gif" width="424" height="15"></div>
</td>
</tr>
<%
qikan_num++;
}
%>
</table>
<table width="772" border="0" align="center">
<tr>
<td><%
out.println("<p><b><font color=´#174572´ size=´2´>本页有"+qikan_num+"条纪录，共找到"+pageTotal+"条</font></b></p>");
out.println("<font color=´#cc00000´ size=´2´>当前是第"+pageNO+"页</font>");
out.println("页数");
for(int i=1;i<pageCount+2;i++)
{
%>
<a href="../search.jsp?pagenum=<%=i%>&keyword=<%=keyword%>&way=<%=way%>"><u><%=i%></u></a>
<%
}
RSa.close();
stmt.close();
con.close();
}%>
</td>
</tr>
</table>
7另一种 删除数据后，跳转的方法
<%
if (session.getAttribute("UserName")==null)
{
response.sendRedirect("../index.jsp");
}else{
String keyword1,SQL;
keyword1=request.getParameter("bookid");
SQL="Delete From bookdindan Where ¶©ÔÄÕßid=´"+keyword1+"´";
Connection con=yy.getConn();
Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
stmt.executeUpdate(SQL);
response.sendRedirect("../myorder.jsp");
stmt.close();
con.close();
}
%>
8将 年月日转换的方法 如 2004-05-02 2004年5月2日
<%!
public static String YMD(String dt)
{
try
{
return dt.substring(0,4)+"年"+dt.substring(5,7)+"月"+dt.substring(8,10)+"日";
}
catch(Exception e)
{
}
return "null";
}
%>
9 中文转换
<%!
public String getStr(String str)
{
try
{
String temp_p=str;
byte[] temp_t=temp_p.getBytes("GBK");
String temp=new String(temp_t,"ISO8859_1");
return temp;
}
catch(Exception e)
{
}
return "null";
}
10 用户注销 代码
<%
session.setAttribute("UserName","");
session.setAttribute("station","");
session.setAttribute("id","");
response.sendRedirect("default.jsp");
%>
第二篇
1 防止用户刷新页面，等待10秒
// default.jsp
<%String aaa="b"+session.getAttribute("nF");
if(!aaa.equals("bnull"))
{
session.setAttribute("nF",null);
response.sendRedirect("1.jsp");
}
else
{
session.setAttribute("nF","a");
%>
//1.jsp
<%@ page contentType="text/html; charset=gb2312"%>
<%@ page language="java" %>
<p>对不起，服务器正在运行时，请勿刷新页面，谢谢合作，如有不便敬请谅解</p>
<p>页面将于10秒后重新回到主页.......请等待！！！</p>
<%response.setHeader("Refresh","10;URL=default.jsp");%>
2用javaBean调用javascript指令
//jsp
try{
studentID=(String)session.getAttribute("studentID");
if(studentID==null){
throw new Exception();
}
}catch(Exception e){
Tools.showalert("您还没有登录，或连接超时，请重新登录!",out);
Tools.showJS("window.open(´../login.jsp´,´_self´)",out);
}
//Bean
import javax.servlet.jsp.JspWriter;
public static void showalert(String msg, JspWriter out)
{
try
{
out.print(String.valueOf(String.valueOf((new StringBuffer("<SCRIPT LANGUAGE=\"javascript\"\n> alert(\"")).append(msg).append("\");\n").append("</SCRIPT>\n"))));
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
3用javaBean 返回
public static void goback(JspWriter out)
{
try
{
out.print("<SCRIPT LANGUAGE=\"javascript\"\n> history.go(-1);\n</SCRIPT>\n");
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
4用bean 插入javascript
public static void goback(JspWriter out)
{
try
{
out.print("<SCRIPT LANGUAGE=\"javascript\"\n> history.go(-1);\n</SCRIPT>\n");
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
