Code [http://www.xueit.com] 1 % @ page language = " java " contentType = " image/jpeg ; charset=UTF-8 " 2 pageEncoding = " UTF-8 " import = " java.awt.*,java.awt.image.*,javax.imageio.*,java.io.* " %
Code
[http://www.xueit.com]
1 <%@ page language="java" contentType="image/jpeg ; charset=UTF-8"
2 pageEncoding="UTF-8" import="java.awt.*,java.awt.image.*,javax.imageio.*,java.io.*"%>
3 <%@ page import ="com.CreatImage"%>
4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5 <html>
6 <head>
7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8 <title>Insert title here</title>
9 </head>
10 <body>
11 <%
12 response.setHeader("Pragma","No-cache");
13 response.setHeader("Cache-Control","no-cache");
14 response.setDateHeader("Expires", 0);
15
16 CreatImage c = new CreatImage(request,response);
17 BufferedImage image = c.creatImage();
18 OutputStream b = response.getOutputStream();
19 %>
20 <%
21 ImageIO.write(image, "JPEG", response.getOutputStream());
22 //必须添加以下两行否则tomcat下jsp出现getOutputStream() has already been called for this response异常
23 out.clear();
24 out = pageContext.pushBody();
25 %>
26 </body>
27 </html>
注意 contentType="image/jpeg ; charset=UTF-8"
Code
[http://www.xueit.com]
1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <%
4 String path = request.getContextPath();
5 %>
6 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
7 <html>
8 <head>
9 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
10 <title>Insert title here</title>
11 <script>
12 function changeCode()
13 {
14 document.getElementById("cc").src="<%=path%>/images.jsp?a=" Math.random();
15 }
16 </script>
17 </head>
18 <body>
19 <form action="" method="post">
20 <table cellspacing="2px" cellpadding="2px" align="center">
21 <tr>
22 <td>用户名：</td>
23 <td><input type="text" id="name" value=""/></td>
24 </tr>
25 <tr>
26 <td>密 码：</td>
27 <td><input type="password" id="password" value=""/></td>
28 </tr>
29 <tr height="26px">
30 <td>验证码：</td><td valign="middle"><input type="text" id="validate"></td>
31 <td><a href="#" onclick="changeCode();"><img alt="" border="0" id="cc" src="<%=path %>/images.jsp"/></a></td>
32 </tr>
33 <tr>
34 <td colspan="2" align="center"><input type="button" name="button" value="submit"/></td>
35 </tr>
36 </table>
37 </form>
38 </body>
39 </html>
