java远程下载文件到本地_java远程下载文件到本地
方法一
**
* 下載遠程文件并保存到本地
*
* @param remoteFilePath-遠程文件路徑
* @param localFilePath-本地文件路徑(帶文件名)
*/
public void downloadFile(String remoteFilePath, String localFilePath) {
URL urlfile = null;
HttpURLConnection httpUrl = null;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
File f = new File(localFilePath);
try {
urlfile = new URL(remoteFilePath);
httpUrl = (HttpURLConnection) urlfile.openConnection();
httpUrl.connect();
bis = new BufferedInputStream(httpUrl.getInputStream());
bos = new BufferedOutputStream(new FileOutputStream(f));
int len = 2048;
byte[] b = new byte[len];
while ((len = bis.read(b)) != -1) {
bos.write(b, 0, len);
}
bos.flush();
bis.close();
httpUrl.disconnect();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
bis.close();
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
方法二
/**
* 下載遠程文件并保存到本地
*
* @param remoteFilePath-遠程文件路徑
* @param localFilePath-本地文件路徑(帶文件名)
*/
public void downloadFile(String remoteFilePath, String localFilePath) {
URL website = null;
ReadableByteChannel rbc = null;
FileOutputStream fos = null;
try {
website = new URL(remoteFilePath);
rbc = Channels.newChannel(website.openStream());
fos = new FileOutputStream(localFilePath);//本地要存儲的文件地址 例如：test.txt
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
} catch (Exception e) {
e.printStackTrace();
}finally{
if(fos!=null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(rbc!=null){
try {
rbc.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
總結
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