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("\\")+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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