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javacmd下载文件(Javacmd)

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java下载bat文件在本地运行的办法?

12345678910111213141516171819202122    Process process=Runtime.getRuntime().exec("cmd /c run.bat");//要执行的文件的路径为run.bat  // 得到输入流 InputStream inputStream=process.getInputStream(); InputStreamReader inputStreamReader=new InputStreamReader(inputStream); BufferedReader bufferedReader=new BufferedReader(inputStreamReader);   // 得到输出流 OutputStream outputStream=process.getOutputStream(); OutputStreamWriter outputStreamWriter=new OutputStreamWriter(outputStream); BufferedWriter bufferedWriter=new BufferedWriter(outputStreamWriter);   bufferedWriter.write("dd\n"); bufferedWriter.flush(); String temp=null; while((temp=bufferedReader.readLine())!=null) { System.out.println(temp);   }}

java下载文件,怎么指定下载到指定的文件夹下啊,就是不弹出保存框,直接下载到指定的文件夹下,谢谢回答

如果是用 IE 等浏览器下载,这些浏览器都有自己的下载目录定义。

如果是你自己用 Java 写了一个浏览器,则在接收到下载流时,用 FileOutputStream fos = new FileOutputStream("d:\\java-browser\\downloads"); 即可。

java怎么下载压缩文件

可以用java的输入,输出流,设置返回的类型为下转

response.setContentType("application/x-download");//设置为下载application/x-download

String filedownload = "/要下载的文件名";//即将下载的文件的相对路径

String filedisplay = "最终要显示给用户的保存文件名";//下载文件时显示的文件保存名称

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

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

Java 下载文件的方法怎么写

参考下面

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;

}

// 下载本地文件

public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {

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();

}

}

// 下载网络文件

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();

}

}

//支持在线打开文件的一种方式

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) { // 在线打开方式

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

}