jsp常用功能模块-JSP实例学习教程

<!-- File name:calendar.jsp --> 

<!-- 显示任意年、月的日历,可选择不同的年、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" onchange="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生成彩色验证码程序

  生成有4个随机数字和杂乱背景的图片,数字和背景颜色会改变,服务器端刷新(用history.go(-1)也会变)

  产生验证码图片的文件image.jsp

<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
Color getRandColor(int fc,int bc){//给定范围获得随机颜色
        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);
        }
%>
<%
//设置页面不缓存
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);

// 在内存中创建图象
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

// 获取图形上下文
Graphics g = image.getGraphics();

//生成随机类
Random random = new Random();

// 设定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);

//设定字体
g.setFont(new Font("Times New Roman",Font.PLAIN,18));

//画边框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);

// 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到
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);
}

// 取随机产生的认证码(4位数字)
String sRand="";
for (int i=0;i<4;i++){
    String rand=String.valueOf(random.nextInt(10));
    sRand+=rand;
    // 将认证码显示到图象中
    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt

(110)));
//调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成
    g.drawString(rand,13*i+6,16);
}

// 将认证码存入SESSION
session.setAttribute("rand",sRand);

// 图象生效
g.dispose();

// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>

 

使用验证码图片的文件a.jsp

<%@ page contentType="text/html;charset=gb2312" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>认证码输入页面</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>系统产生的认证码:</td>
<td><img border=0 src="image.jsp"></td>
</tr>
<tr>
<td align=left>输入上面的认证码:</td>
<td><input type=text name=rand maxlength=4 value=""></td>
</tr>
<tr>
<td colspan=2 align=center><input type=submit value="提交检测"></td>
</tr>
</form>
</body>
</html>

 

验证的页面check.jsp

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*"

errorPage="" %>
<html>
<head>
<title>认证码验证页面</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");
%>
系统产生的认证码为: <%= rand %><br>
您输入的认证码为: <%= input %><br>
<br>
<%
  if (rand.equals(input)) {
%>
<font color=green>输入相同,认证成功!</font>
<%
  } else {
%>
<font color=red>输入不同,认证失败!</font>
<%
  }
%>
</body>
</html>

 http://www.86oo.com/html/113/12160.html
posted @ 2007-09-30 09:55  springMVC3.1例子  阅读(189)  评论(0编辑  收藏  举报