网页简单文件下载

最近做一个小项目，需要在网页提供一个按钮，进行简单的文件下载，找了一个简便的方式，现将代码分享，菜鸟新手，共勉！感谢无名大神提供支持。

在servlet中，简单的调用该函数，传入request,response,和供用户下载的File文件即可，

public void download_file(HttpServletRequest request,

HttpServletResponse response, File tempFile)

throws java.io.UnsupportedEncodingException {

String filenamedownload = tempFile.toString();

String filenamedisplay = tempFile.getName();

try {

filenamedisplay = URLEncoder.encode(filenamedisplay, "UTF-8");

} catch (UnsupportedEncodingException e1) {

e1.printStackTrace();

}

response.addHeader("Content-Disposition", "attachment;filename="

+ filenamedisplay);

OutputStream output = null;

FileInputStream fis = null;

try {

output = response.getOutputStream();

fis = new FileInputStream(filenamedownload);

byte[] b = new byte[1024];

int i = 0;

while ((i = fis.read(b)) > 0) {

output.write(b, 0, i);

}

output.flush();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fis != null) {

try {

fis.close();

} catch (IOException e) {

e.printStackTrace();

}

fis = null;

}

if (output != null) {

try {

output.close();

} catch (IOException e) {

e.printStackTrace();

}

output = null;

}

}

}

}