Java 下載文件的方法怎么寫

參考下面

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public HttpServletResponse download(String path, HttpServletResponse response) {

try {

// path是指欲下載的文件的路徑。

File file = new File(path);

// 取得文件名。

String filename = file.getName();

// 取得文件的后綴名。

String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();

// 以流的形式下載文件。

InputStream fis = new BufferedInputStream(new FileInputStream(path));

byte[] buffer = new byte[fis.available()];

fis.read(buffer);

fis.close();

// 清空response

response.reset();

// 設(shè)置response的Header

response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));

response.addHeader("Content-Length", "" + file.length());

OutputStream toClient = new BufferedOutputStream(response.getOutputStream());

response.setContentType("application/octet-stream");

toClient.write(buffer);

toClient.flush();

toClient.close();

} catch (IOException ex) {

ex.printStackTrace();

}

return response;

}

// 下載本地文件

public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {

String fileName = "Operator.doc".toString(); // 文件的默認保存名

// 讀到流中

InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路徑

// 設(shè)置輸出的格式

response.reset();

response.setContentType("bin");

response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");

// 循環(huán)取出流中的數(shù)據(jù)

byte[] b = new byte[100];

int len;

try {

while ((len = inStream.read(b)) 0)

response.getOutputStream().write(b, 0, len);

inStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

// 下載網(wǎng)絡(luò)文件

public void downloadNet(HttpServletResponse response) throws MalformedURLException {

int bytesum = 0;

int byteread = 0;

URL url = new URL("windine.blogdriver.com/logo.gif");

try {

URLConnection conn = url.openConnection();

InputStream inStream = conn.getInputStream();

FileOutputStream fs = new FileOutputStream("c:/abc.gif");

byte[] buffer = new byte[1204];

int length;

while ((byteread = inStream.read(buffer)) != -1) {

bytesum += byteread;

System.out.println(bytesum);

fs.write(buffer, 0, byteread);

}

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

//支持在線打開文件的一種方式

public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {

File f = new File(filePath);

if (!f.exists()) {

response.sendError(404, "File not found!");

return;

}

BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));

byte[] buf = new byte[1024];

int len = 0;

response.reset(); // 非常重要

if (isOnLine) { // 在線打開方式

URL u = new URL("" + filePath);

response.setContentType(u.openConnection().getContentType());

response.setHeader("Content-Disposition", "inline; filename=" + f.getName());

// 文件名應(yīng)該編碼成UTF-8

} else { // 純下載方式

response.setContentType("application/x-msdownload");

response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());

}

OutputStream out = response.getOutputStream();

while ((len = br.read(buf)) 0)

out.write(buf, 0, len);

br.close();

out.close();

}

使用java代碼下載word文件

我同事在做項目的時候也遇到這個問題，應(yīng)該是插件本身生成的docx文件是xml格式的，有些版本的word打開是會有提示，如果沒有必要最好生成doc格式的word

Java中文件下載該怎么寫代碼求高手指導

if (upfile.exists()) {

bytes = FileUtils.readFileToByteArray(upfile);

response.setContentType("application/x-download");

String agent = request.getHeader("USER-AGENT");//用戶代理

// 防止中文文件名亂碼

if (null != agent -1 != agent.indexOf("MSIE")) {

String codedfilename = StringUtils.replace(URLEncoder.encode(fileName, "UTF-8"), "+", "%20");

response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);

} else if (null != agent -1 != agent.indexOf("Mozilla")) {

String codedfilename = MimeUtility.encodeText(fileName, "UTF-8", "B");

response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);

} else {

response.setHeader("Content-Disposition", "attachment;filename=" + fileName);

}

response.setContentLength(bytes.length);

response.getOutputStream().write(bytes);

}

有沒大神教教我java怎么實現(xiàn)文件下載的，不要超鏈接那種，要有action求jsp和action

a href="control/downFile.do?pistrPath=' + rec.get('path') + '"'

請求到后臺，把文件地址傳到后臺

/**

* 下載文件

* @param pistrPath

* @param piobjResponse

* @throws MalformedURLException

*/

public void downloadNet(String pistrPath, HttpServletResponse piobjResponse) throws MalformedURLException {

// 下載網(wǎng)絡(luò)文件

int iByte = 0;

System.getProperties();

try {

URL objurl = new URL(pistrPath);

System.out.println(pistrPath);

URLEncoder.encode(objurl.toString(), SengisConstant.STR_CN_ENCODE);

URLConnection objConn = objurl.openConnection();

InputStream objInputStream = objConn.getInputStream();

OutputStream objOutStream = piobjResponse.getOutputStream();

byte[] arrByte = new byte[1204];

while ((iByte = objInputStream.read(arrByte)) != -1) {

objOutStream.write(arrByte, 0, iByte);

}

objOutStream.flush();

objOutStream.close();

objInputStream.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}