我們在開發時經常使用到網路請求，但是有時候會遇到服務端給的url不是最終的，我們用這個url在瀏覽器上鍊接下，會發現url改變了，這就是url不是最終的，而是被重定向後的連結地址。

  那我們如何解決這種問題呢，不多說，看程式碼：

public class HttpClientURLRedirectUtils {

/**
* Http URL重定向
*/
public static String redirect(String url) {
DefaultHttpClient httpclient = null;
try {
httpclient = new DefaultHttpClient();
httpclient.setRedirectHandler(new RedirectHandler() {

@Override
public boolean isRedirectRequested(HttpResponse response,
HttpContext context) {
return false;
}

@Override
public URI getLocationURI(HttpResponse response, HttpContext context)
throws org.apache.http.ProtocolException {
return null;
}
});

HttpGet httpget = new HttpGet(url);
HttpResponse response = httpclient.execute(httpget);

int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == HttpStatus.SC_OK) {
// 獲取響應實體
HttpEntity entity = response.getEntity();
if (entity != null) {
// 列印響應內容長度
// System.out.println("Response content length: " + entity.getContentLength());
// 列印響應內容
// System.out.println("Response content: " + EntityUtils.toString(entity));
}
} else if (statusCode == HttpStatus.SC_MOVED_TEMPORARILY
|| statusCode == HttpStatus.SC_MOVED_PERMANENTLY) {

// System.out.println("當前頁面發生重定向了---");

org.apache.http.Header[] headers = response.getHeaders("Location");
if(headers!=null && headers.length>0){
String redirectUrl = headers[0].getValue();
// System.out.println("重定向的URL:"+redirectUrl);
redirectUrl = redirectUrl.replace(" ", "%20");
return redirectUrl;
}
}

} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 關閉連線,釋放資源
httpclient.getConnectionManager().shutdown();
}
return url;
}

}