本文目录一览:
- 1、java下载bat文件在本地运行的办法?
- 2、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
- 3、java怎么下载压缩文件
- 4、Java 下载文件的方法怎么写
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();
}