public static void main(String[] args) {
HttpClient client = new HttpClient(); // Create an instance of HttpClient.
GetMethod method = new GetMethod(url); // Create a method instance.
method
.getParams()
.setParameter(
HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler(
3, false)); // Provide custom retry handler is necessary
try {
int statusCode = client.executeMethod(method); // Execute the method.
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " + method.getStatusLine());
}
byte[] responseBody = method.getResponseBody(); // Read the response body.
System.out.println(
new String(
responseBody)); // Deal with the response.// Use caution: ensure correct character
// encoding and is not binary data
} catch (HttpException e) {
System.err.println("Fatal protocol violation: " + e.getMessage());
e.printStackTrace();
} catch (IOException e) {
System.err.println("Fatal transport error: " + e.getMessage());
e.printStackTrace();
} finally {
method.releaseConnection(); // Release the connection.
}
}
// ���� URL ָ�����ҳ
public String downloadFile(String url) {
String filePath = null;
// 1.���� HttpClinet��������
HttpClient httpClient = new HttpClient();
// ���� HTTP���ӳ�ʱ 5s
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
// 2.���� GetMethod��������
GetMethod getMethod = new GetMethod(url);
// ���� get����ʱ 5s
getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
// �����������Դ���
getMethod
.getParams()
.setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
// 3.ִ��GET����
try {
int statusCode = httpClient.executeMethod(getMethod);
// �жϷ��ʵ�״̬��
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " + getMethod.getStatusLine());
filePath = null;
}
// 4.���� HTTP ��Ӧ����
byte[] responseBody = getMethod.getResponseBody(); // ��ȡΪ�ֽ�����
// ������ҳ url ���ɱ���ʱ���ļ���
filePath =
"temp\\" + getFileNameByUrl(url, getMethod.getResponseHeader("Content-Type").getValue());
File file = new File(filePath);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdir();
}
saveToLocal(responseBody, filePath);
} catch (HttpException e) {
// �����������쳣��������Э�鲻�Ի��߷��ص�����������
System.out.println("�������http��ַ�Ƿ���ȷ");
e.printStackTrace();
} catch (IOException e) {
// ���������쳣
e.printStackTrace();
} finally {
// �ͷ�����
getMethod.releaseConnection();
}
return filePath;
}
public static Data getHTTPData(
HttpServletRequest req, HttpServletResponse res, String surl, long since)
throws DataSourceException, IOException {
int tries = 1;
// timeout msecs of time we're allowed in this routine
// we must return or throw an exception. 0 means infinite.
int timeout = mTimeout;
if (req != null) {
String timeoutParm = req.getParameter("timeout");
if (timeoutParm != null) {
timeout = Integer.parseInt(timeoutParm);
}
}
long t1 = System.currentTimeMillis();
long elapsed = 0;
if (surl == null) {
surl = getURL(req);
}
while (true) {
String m = null;
long tout;
if (timeout > 0) {
tout = timeout - elapsed;
if (tout <= 0) {
throw new InterruptedIOException(
/* (non-Javadoc)
* @i18n.test
* @org-mes=p[0] + " timed out"
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-194", new Object[] {surl}));
}
} else {
tout = 0;
}
try {
HttpData data = getDataOnce(req, res, since, surl, 0, (int) tout);
if (data.code >= 400) {
data.release();
throw new DataSourceException(errorMessage(data.code));
}
return data;
} catch (HttpRecoverableException e) {
// This type of exception should be retried.
if (tries++ > mMaxRetries) {
throw new InterruptedIOException(
/* (non-Javadoc)
* @i18n.test
* @org-mes="too many retries, exception: " + p[0]
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-217", new Object[] {e.getMessage()}));
}
mLogger.warn(
/* (non-Javadoc)
* @i18n.test
* @org-mes="retrying a recoverable exception: " + p[0]
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-226", new Object[] {e.getMessage()}));
} catch (HttpException e) {
String msg =
/* (non-Javadoc)
* @i18n.test
* @org-mes="HttpException: " + p[0]
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-235", new Object[] {e.getMessage()});
throw new IOException(
/* (non-Javadoc)
* @i18n.test
* @org-mes="HttpException: " + p[0]
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-235", new Object[] {e.getMessage()}));
} catch (IOException e) {
try {
Class ssle = Class.forName("javax.net.ssl.SSLException");
if (ssle.isAssignableFrom(e.getClass())) {
throw new DataSourceException(
/* (non-Javadoc)
* @i18n.test
* @org-mes="SSL exception: " + p[0]
*/
org.openlaszlo.i18n.LaszloMessages.getMessage(
HTTPDataSource.class.getName(), "051018-256", new Object[] {e.getMessage()}));
}
} catch (ClassNotFoundException cfne) {
}
throw e;
}
long t2 = System.currentTimeMillis();
elapsed = (t2 - t1);
}
}