jsp常用功能模块
<!-- File name:calendar.jsp -->?
<!-- 顯示任意年、月的日歷，可選擇不同的年、月。?
author:wildfield -->?
<%@ page language="java" import="java.util.*" %>?
<%! String year;?
String month;?
%>?
<% month=request.getParameter("month");?
year =request.getParameter("year");?
%>?
<html>?
<head>?
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">?
<title>日</title>?
<script Language="javascript">?
<!--?
function changeMonth()?
{?
var mm="calendar.jsp?month="+document.sm.elements[0].selectedIndex+"&year="?
+<%=year%>;?
window.open(mm,"_self");?
}?
//--></script>?
</head>?
<%! String days[]; %>?
<%?
days=new String[42];?
for(int i=0;i<42;i++)?
{?
days="";?
}?
%>?
<%?
Calendar thisMonth=Calendar.getInstance();?
if(month!=null&&(!month.equals("null")))?
thisMonth.set(Calendar.MONTH, Integer.parseInt(month) );?
if(year!=null&&(!year.equals("null")))?
thisMonth.set(Calendar.YEAR, Integer.parseInt(year) );?
year=String.valueOf(thisMonth.get(Calendar.YEAR));?
month=String.valueOf(thisMonth.get(Calendar.MONTH));?
thisMonth.setFirstDayOfWeek(Calendar.SUNDAY);?
thisMonth.set(Calendar.DAY_OF_MONTH,1);?
int firstIndex=thisMonth.get(Calendar.DAY_OF_WEEK)-1;?
int maxIndex=thisMonth.getActualMaximum(Calendar.DAY_OF_MONTH);?
for(int i=0;i<maxIndex;i++)?
{?
days[firstIndex+i]=String.valueOf(i+1);?
}?
%>?
<body>?
<FORM name="sm" method="post" action="calendar.jsp">?
?? <%=year%>年? <%=Integer.parseInt(month)+1%>月?
<table border="0" width="168" height="81">?
<div align=center>?
<tr>?
<th width="25" height="16" bgcolor="#FFFF00"><font color="red">日</font>?
</th>?
<th width="25" height="16" bgcolor="#FFFF00">一</th>?
<th width="25" height="16" bgcolor="#FFFF00">二</th>?
<th width="25" height="16" bgcolor="#FFFF00">三</th>?
<th width="25" height="16" bgcolor="#FFFF00">四</th>?
<th width="25" height="16" bgcolor="#FFFF00">五</th>?
<th width="25" height="16" bgcolor="#FFFF00"><font color="green">六</fon?
t></th>?
</tr>?
<% for(int j=0;j<6;j++) { %>?
<tr>?
<% for(int i=j*7;i<(j+1)*7;i++) { %>?
<td width="15%" height="16" bgcolor="#C0C0C0" valign="middle" align="ce?
nter">?
<a href="jump.jsp?year=<%=year%>&month=<%=Integer.parseInt(month)+1%>&d?
ate=<%=days[i]%>" target="main"><%=days[i]%></a></td>?
<% } %>?
</tr>?
<% } %>?
</div>?
</table>?
<table border="0" width="168" height="20">?
<tr>?
<td width=30%><select name="month" size="1" οnchange="changeMonth()" >?
<option value="0">一月</option>?
<option value="1">二月</option>?
<option value="2">三月</option>?
<option value="3">四月</option>?
<option value="4">五月</option>?
<option value="5">六月</option>?
<option value="6">七月</option>?
<option value="7">八月</option>?
<option value="8">九月</option>?
<option value="9">十月</option>?
<option value="10">十一月</option>?
<option value="11">十二月</option>?
</select></td>?
<td width=28%><input type=text name="year" value=<%=year%> size=4 maxlength?
=4></td>?
<td>年</td>?
<td width=28%><input type=submit value="提交"></td>?
</tr>?
</table>?
</FORM>?
<script Language="javascript">?
<!--?
document.sm.month.options.selectedIndex=<%=month%>;?
//-->?
</script>?
</body>?
</html>?
JSP生成彩色驗證碼程序
生成有4個隨機數字和雜亂背景的圖片，數字和背景顏色會改變，服務器端刷新（用history.go(-1)也會
變）
產生驗證碼圖片的文件image.jsp
<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
Color getRandColor(int fc,int bc){//給定范圍獲得隨機顏色
??????? Random random = new Random();
??????? if(fc>255) fc=255;
??????? if(bc>255) bc=255;
??????? int r=fc+random.nextInt(bc-fc);
??????? int g=fc+random.nextInt(bc-fc);
??????? int b=fc+random.nextInt(bc-fc);
??????? return new Color(r,g,b);
??????? }
%>
<%
//設置頁面不緩存
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
// 在內存中創建圖象
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
//生成隨機類
Random random = new Random();
// 設定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//設定字體
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//畫邊框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 隨機產生155條干擾線，使圖象中的認證碼不易被其它程序探測到
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
?int x = random.nextInt(width);
?int y = random.nextInt(height);
??????? int xl = random.nextInt(12);
??????? int yl = random.nextInt(12);
?g.drawLine(x,y,x+xl,y+yl);
}
// 取隨機產生的認證碼(4位數字)
String sRand="";
for (int i=0;i<4;i++){
??? String rand=String.valueOf(random.nextInt(10));
??? sRand+=rand;
??? // 將認證碼顯示到圖象中
??? g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt
(110)));
//調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
??? g.drawString(rand,13*i+6,16);
}
// 將認證碼存入SESSION
session.setAttribute("rand",sRand);
// 圖象生效
g.dispose();
// 輸出圖象到頁面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
使用驗證碼圖片的文件a.jsp
<%@ page contentType="text/html;charset=gb2312" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>認證碼輸入頁面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
</head>
<body>
<form method=post action="check.jsp">
<table>
<tr>
<td align=left>系統產生的認證碼：</td>
<td><img border=0 src="image.jsp"></td>
</tr>
<tr>
<td align=left>輸入上面的認證碼：</td>
<td><input type=text name=rand maxlength=4 value=""></td>
</tr>
<tr>
<td colspan=2 align=center><input type=submit value="提交檢測"></td>
</tr>
</form>
</body>
</html>
驗證的頁面check.jsp
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*"
errorPage="" %>
<html>
<head>
<title>認證碼驗證頁面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
</head>
<body>
<%
?String rand = (String)session.getAttribute("rand");
?String input = request.getParameter("rand");
%>
系統產生的認證碼為： <%= rand %><br>
您輸入的認證碼為： <%= input %><br>
<br>
<%
? if (rand.equals(input)) {
%>
<font color=green>輸入相同，認證成功！</font>
<%
? } else {
%>
<font color=red>輸入不同，認證失敗！</font>
<%
? }
%>
</body>
</html>
總結
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