file.jsp代碼:<%@ page contentType="text/html; charset=utf-8" language="java"import="java.sql.*,java.util.*,java.io.*" errorPage=""%><%@taglib prefix="s" uri="/struts-tags"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";%><base href="<%=basePath%>"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>檔案預覽</title><link rel="shortcut icon" href="images/DA_SY.gif" /><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><script type="text/javascript" language="javascript" src="js/jquery.js"></script></head><% out.clear(); out = pageContext.pushBody(); response.setContentType("image/jpeg");//設定顯示檔案或圖片的格式如:application/pdf try { String imgName = request.getParameter("fileName"); String imgPath1 = "D:/IPM/hardware/"+imgName; String imgPath2 = "D:/IPM/hardware/error.jpg"; //判斷該路徑下的檔案是否存在 File file = new File(imgPath1); if (file.exists()&& !imgName.equals("")) { DataOutputStream temps = new DataOutputStream(response .getOutputStream()); DataInputStream in = new DataInputStream( new FileInputStream(imgPath1)); byte[] b = new byte[2048]; while ((in.read(b)) != -1) { temps.write(b); temps.flush(); } in.close(); temps.close(); } else { DataOutputStream temps = new DataOutputStream(response .getOutputStream()); DataInputStream in = new DataInputStream( new FileInputStream(imgPath2)); byte[] b = new byte[2048]; while ((in.read(b)) != -1) { temps.write(b); temps.flush(); } in.close(); temps.close(); } } catch (Exception e) { out.println(e.getMessage()); }%><body></body></html>在jsp頁面用超連結等方式訪問檔案或圖片<a href="file.jsp?fileName=xxx">點擊預覽</a>或者<img src="file.jsp?fileName=xxx">
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