通过使用java代码传递URL来下载文件
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Download file by passing URL using java code
提问by Bhavika Thakkar
I am trying to write a code in java in which user provide a url link and the program take url link and download a web page as it is and save at particular location..same as save as... option available on webpage.
我正在尝试用 java 编写一个代码，其中用户提供一个 url 链接，程序获取 url 链接并按原样下载网页并保存在特定位置..与网页上提供的另存为...选项相同。
Please can anybody help me
请任何人都可以帮助我
Thanks in advance
提前致谢
回答by Moro
You can use Java URL API to get an input stream on the URL then read the from it and write through output stream on a file.
您可以使用 Java URL API 获取 URL 上的输入流，然后从中读取并通过输出流写入文件。
回答by kgiannakakis
Have a look at the HtmlParser. It has some features that will help you extract resources from a web page.
看看HtmlParser。它有一些功能可以帮助您从网页中提取资源。
回答by Nitul
// Sample URL : http://www.novell.com/coolsolutions/tools/downloads/ntradping.zip
// 示例 URL：http: //www.novell.com/coolsolutions/tools/downloads/ntradping.zip
import java.io.*;
import java.net.*;
public class UrlDownload {
final static int size = 1024;
public static void fileUrl(String fAddress, String localFileName, String destinationDir) {
OutputStream outStream = null;
URLConnection uCon = null;
InputStream is = null;
try {
URL url;
byte[] buf;
int byteRead, byteWritten = 0;
url = new URL(fAddress);
outStream = new BufferedOutputStream(new FileOutputStream(destinationDir + "\" + localFileName));
uCon = url.openConnection();
is = uCon.getInputStream();
buf = new byte[size];
while ((byteRead = is.read(buf)) != -1) {
outStream.write(buf, 0, byteRead);
byteWritten += byteRead;
}
System.out.println("Downloaded Successfully.");
System.out.println("File name:\"" + localFileName + "\"\nNo ofbytes :" + byteWritten);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
is.close();
outStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void fileDownload(String fAddress, String destinationDir) {
int slashIndex = fAddress.lastIndexOf('/');
int periodIndex = fAddress.lastIndexOf('.');
String fileName = fAddress.substring(slashIndex + 1);
if (periodIndex >= 1 && slashIndex >= 0 && slashIndex < fAddress.length() - 1) {
fileUrl(fAddress, fileName, destinationDir);
} else {
System.err.println("path or file name.");
}
}
public static void main(String[] args) {
if (args.length == 2) {
for (int i = 1; i < args.length; i++) {
fileDownload(args[i], args[0]);
}
} else {
}
}
}
It is working fully.
它正在全面工作。
