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jsp文件下载模板

September 20, 2018 • Read: 243 • JSP

download.jsp

<%@page import="java.io.*"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP 'download.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<jsp:include page="../res.jsp" />
</head>
<body>
    <%
        /*
            File 文件,文件夹
            InputStream 输入流
            OutputStream 输出流    
        */
        InputStream is = null;
        OutputStream os = null;
        response.setContentType("application/octet-stream");
        //attachment:附件
        //inline:直接打开
        response.setHeader("Content-Disposition","attachment;filename = test.txt");
        try {
            is = new FileInputStream(new File("D:/test.txt"));
            os = response.getOutputStream();
            byte[] bytes = new byte[1024];
            int len = 0;
            while((len = is.read(bytes)) != -1)
                os.write(bytes,0,len);
            os.flush();
            //解决抛出异常
            out.clear();
            out = pageContext.pushBody();
         } catch(Exception e) {
            e.printStackTrace();
        } finally {//无论发生什么,finally里的代码一定会执行
            if(is != null) {
                try {//如果is关闭失败,os必须也必须关闭掉
                    is.close();
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
            if(os != null) {
                try {
                    os.close();
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
        }
    %>
</body>
</html>
最后编辑于: October 7, 2018
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