JAVA源代码

2022-05-20 04:36:16 第一文档网 [ 字体：小中大 ] [

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源代码,JAVA

public HttpServletResponse download(String path, HttpServletResponse response) { try {

// path是指欲下载的文件的路径。 File file = new File(path);

// 取得文件名。

String filename = file.getName(); // 取得文件的后缀名。

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

// 以流的形式下载文件。

InputStream fis = new BufferedInputStream( new FileInputStream(path)); byte [] buffer = new byte [fis.available()]; fis.read(buffer); fis.close();

// 清空response response.reset();

// 设置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; }

public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {

// 下载本地文件

String fileName = " Operator.doc " .toString(); // 文件的默认保存名 // 读到流中

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

// 设置输出的格式 response.reset();

response.setContentType( " bin " );

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

fileName + " \ "" );

// 循环取出流中的数据

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(); } }

public void downloadNet(HttpServletResponse response) MalformedURLException {

// 下载网络文件 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(); } }

//支持在线打开文件的一种方式

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

File f = new File(filePath); if ( ! f.exists()) {

throws boolean
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) { // 在线打开方式

URL u = new URL( " file:/// " + filePath);

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

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

// 文件名应该编码成UTF-8 } else { // 纯下载方式

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(); }

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