本文實例講述了jsp實現從服務器下載xls文件到客戶端的方法。分享給大家供大家參考，具體如下：
參考網上的代碼寫了一個下載xls文件到客戶端的jsp頁面，只要將服務器的文件地址傳給這個jsp頁面就可以實現下載文件到客戶端了。
<%@ page language="java"import="java.util.*"pageEncoding="utf-8"%><%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%><%@ page import="java.io.*" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link href="styles/basic.css" rel="stylesheet" type="text/css" /><title>download</title></head><%response.setCharacterEncoding("gb2312");request.setCharacterEncoding("gb2312");if (request.getParameter("file") != null) {OutputStream os = null;FileInputStream fis = null;try {String file = request.getParameter("file");if (!(new File(file)).exists()) {System.out.println("沒有文件");return;}System.out.println("文件名為："+file);os = response.getOutputStream();response.setHeader("content-disposition", "attachment;filename=" + file);response.setContentType("application/vnd.ms-excel");//此項內容隨文件類型而異byte temp[] = new byte[1000];fis = new FileInputStream(file);int n = 0;while ((n = fis.read(temp)) != -1) {os.write(temp, 0, n);}} catch (Exception e) {out.print("出錯");} finally {if (os != null)os.close();if (fis != null)fis.close();}out.clear();out = pageContext.pushBody();}%><form action="" method="post"><select name="file"><option value="D:/Program Files/apache-tomcat-6.0.18/webapps/StarAttendance/upload/temp.xls">冷山sky_snow</option></select><input type="submit"/></form></html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%@ page import="java.io.*" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link href="styles/basic.css" rel="stylesheet" type="text/css" /> <title>download</title></head><% response.setCharacterEncoding("gb2312"); request.setCharacterEncoding("gb2312"); if (request.getParameter("file") != null) { OutputStream os = null; FileInputStream fis = null; try { String file = request.getParameter("file"); if (!(new File(file)).exists()) { System.out.println("沒有文件"); return; } System.out.println("文件名為："+file); os = response.getOutputStream(); response.setHeader("content-disposition", "attachment;filename=" + file); response.setContentType("application/vnd.ms-excel");//此項內容隨文件類型而異 byte temp[] = new byte[1000]; fis = new FileInputStream(file); int n = 0; while ((n = fis.read(temp)) != -1) { os.write(temp, 0, n); } } catch (Exception e) { out.print("出錯"); } finally { if (os != null) os.close(); if (fis != null) fis.close(); } out.clear(); out = pageContext.pushBody(); }%><form action="" method="post"> <select name="file"> <option value="D:/Program Files/apache-tomcat-6.0.18/webapps/StarAttendance/upload/temp.xls"> 冷山sky_snow </option> </select> <input type="submit"/></form> </html>2.另外一個修改后的版本（下載文件名可包含中文）
<%@ page language="java"import="java.util.*,java.net.*"pageEncoding="utf-8"%><%@ taglib prefix="c"uri="http://java.sun.com/jsp/jstl/core"%><%@ page import="java.io.*" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link href="styles/basic.css" rel="stylesheet" type="text/css" /><title>download</title></head><%response.setCharacterEncoding("UTF-8");request.setCharacterEncoding("UTF-8");String filepath = new String(request.getParameter("file").getBytes("ISO-8859-1"),"UTF-8");System.out.println("============================"+filepath);if (filepath != null) {OutputStream os = null;FileInputStream fis = null;try {String file = filepath;if (!(new File(file)).exists()) {System.out.println("沒有文件");return;}String filefilename = file.substring(file.lastIndexOf("http://")+1);System.out.println("文件名為："+filename);os = response.getOutputStream();response.setHeader("content-disposition", "attachment;filename=" + new String(filename.getBytes("GBK"), "ISO-8859-1"));response.setContentType("application/octet-stream");//八進制流 與文件類型無關byte temp[] = new byte[1024];fis = new FileInputStream(file);int n = 0;while ((n = fis.read(temp)) != -1) {os.write(temp, 0, n);}} catch (Exception e) {out.print("出錯了");} finally {if (os != null)os.close();if (fis != null)fis.close();}out.clear();out = pageContext.pushBody();}%></html>希望本文所述對大家JSP程序設計有所幫助。
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