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base64:保存二进制图片内容并显示测试

2013-12-25 11:30 381 查看

base64.jsp--页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page import="java.io.File"%>

<%@page import="java.io.InputStream"%>

<%@page import="sun.misc.BASE64Encoder"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>cookie encoding</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<%

System.out.println("根目录下的图片路径="+this.getServletContext().getRealPath("cookie.gif"));

File file=new File(this.getServletContext().getRealPath("cookie.gif"));

byte[] binary=new byte[(int)file.length()];

InputStream ins=this.getServletContext().getResourceAsStream(file.getName());

ins.read(binary);

ins.close();

String content=BASE64Encoder.class.newInstance().encode(binary);

Cookie cookie=new Cookie("file",content);

response.addCookie(cookie);

%>

</head>

<body>

从Cookie 中获取的二进制图片：<img alt="" src="base64_decode.jsp"><br/>

<textarea id='cookieArea' style='width: 100%;heigh:800px;'></textarea>

<script type="text/javascript">cookieArea.value=document.cookie;</script>

</body>

</html>

base64_decode.jsp--页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page import="sun.misc.BASE64Decoder"%>

<%

out.clear();

for(Cookie cookie:request.getCookies()){

if(cookie.getName().equals("file")){

byte[] binary=BASE64Decoder.class.newInstance().decodeBuffer(cookie.getValue().replace(" ",""));

response.setHeader("Content-Type","image/gif");

response.setHeader("Content-Disposition","inline;filename=cookie.gif");

response.setHeader("Connection","close");

response.setContentLength(binary.length);

response.getOutputStream().write(binary);

response.getOutputStream().flush();

response.getOutputStream().close();

}

}

out.clear();

out = pageContext.pushBody();

%>

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