我想从 Internet url 下载 csv 文件。我已经尝试了所有可以在网上找到但无法下载的代码。
URL google = new URL("myurl");
ReadableByteChannel rbc = Channels.newChannel(google.openStream());
FileOutputStream fos = new FileOutputStream("C://excelsheet.csv");
fos.getChannel().transferFrom(rbc, 0, 1 << 24);
此代码不起作用
我使用了这个功能，它也不起作用。
public stacvoid saveUrl(String filename, String urlString) throws MalformedURLException, IOException
{
BufferedInputStream in = null;
FileOutputStream fout = null;
try
{
in = new BufferedInputStream(new URL(urlString).openStream());
fout = new FileOutputStream(filename);
byte data[] = new byte[1024];
int count;
while ((count = in.read(data, 0, 1024)) != -1)
{
fout.write(data, 0, count);
}
}
finally
{
if (in != null)
in.close();
if (fout != null)
fout.close();
}
}
我在我的 url 上尝试了一个简单的输入流，但这也不起作用。
URL oracle = new URL("myurl");
URLConnection yc = oracle.openConnection();
BufferedReader br = new BufferedReader(new InputStreamReader(
yc.getInputStream()));
现在代替 myurl ，如果我输入任何其他 url ，缓冲读取器确实会获取数据。如果我在浏览器中输入 myurl，我会弹出一个窗口来保存或下载 csv 文件。所以问题不在于不正确的“myurl”
是否有可能在“myurl”上运行的servelet/代码实际上检查请求是否来自浏览器，然后才发送数据。
感谢大家 。使用httpclient，它对我有用。下面是下载 csv 文件的代码，将其保存在本地，然后读取并解析所有令牌。
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet("your url to download");
HttpResponse response = httpclient.execute(httpget);
System.out.println(response.getProtocolVersion());
System.out.println(response.getStatusLine().getStatusCode());
System.out.println(response.getStatusLine().getReasonPhrase());
System.out.println(response.getStatusLine().toString());
HttpEntity entity = response.getEntity();
if (entity != null) {
FileOutputStream fos = new java.io.FileOutputStream("C://excelsheet.csv");
entity.writeTo(fos);
fos.close();
}
//create BufferedReader to read csv file
BufferedReader br = new BufferedReader( new FileReader("C://excelsheet.csv"));
String strLine = "";
StringTokenizer st = null;
int lineNumber = 0, tokenNumber = 0;
while( (strLine = br.readLine()) != null)
{
lineNumber++;
//break comma separated line using ","
st = new StringTokenizer(strLine, ",");
while(st.hasMoreTokens())
{
//display csv values
tokenNumber++;
System.out.println("Line # " + lineNumber +
", Token # " + tokenNumber
+ ", Token : "+ st.nextToken());
}
//reset token number
tokenNumber = 0;
}
}
catch (Exception e) {
System.out.println("insdie the catch part");
System.out.println(e.toString());
}