Getting URL parameter in java and extract a specific text from that URL

Question

I have a URL and I need to get the value of v from this URL  Here is my URL  http   www youtube com watch v  RCIP6OrQrE  How can I do that

User · Answer

Using pure Java 8

Assumming you want to extract param "v" from url:

             String paramV = Stream.of(url.split("?")[1].split("&"))
                        .map(kv -> kv.split("="))
                        .filter(kv -> "v".equalsIgnoreCase(kv[0]))
                        .map(kv -> kv[1])
                        .findFirst()
                        .orElse("");

User · Answer

I think the one of the easiest ways out would be to parse the string returned by URL getQuery   as  public static Map lt String  String gt  getQueryMap String query          String   params   query split   amp           Map lt String  String gt  map   new HashMap lt String  String gt          for  String param   params              String name   param split      0             String value   param split      1             map put name  value                 return map        You can use the map returned by this function to retrieve the value keying in the parameter name

User · Answer

I have something like this   import org apache http NameValuePair  import org apache http client utils URIBuilder   private String getParamValue String link  String paramName  throws URISyntaxException           List lt NameValuePair gt  queryParams   new URIBuilder link  getQueryParams            return queryParams stream                    filter param - gt  param getName   equalsIgnoreCase paramName                    map NameValuePair  getValue                   findFirst                    orElse

User · Answer

I wrote this last month for Joomla Module when implementing youtube videos   with the Gdata API   I ve since converted it to java   Import These Libraries      import java net URL      import java util regex      Copy Paste this function      public String getVideoId  String videoId   throws Exception           String pattern      https  ftp file     -a-zA-Z0-9  amp                  -a-zA-Z0-9  amp                     Pattern p   Pattern compile pattern           Matcher m   p matcher videoId           int youtu   videoId indexOf  youtu            if m matches    amp  amp  youtu    -1               int ytu   videoId indexOf  http   youtu be                 if ytu    -1                     String   split   videoId split   be                     return split 1                             URL youtube   new URL videoId               String   split   youtube getQuery   split                   int query   split 1  indexOf   amp                 if query    -1                   String   nSplit   split 1  split   amp                     return nSplit 0                 else return split 1                     return null    throw something or return what you want         URL s it will work with  http   www youtube com watch v k0BWlvnBmIE  General URL  http   youtu be k0BWlvnBmIE  Share URL  http   www youtube com watch v UWb5Qc-fBvk amp list FLzH5IF4Lwgv-DM3CupM3Zog amp index 2  Playlist URL

User · Answer

this will work for all sort of youtube url   if url could be  youtube com  v  RCIP6OrQrE youtube com v  RCIP6OrQrE youtube com watch v  RCIP6OrQrE youtube com watch v  RCIP6OrQrE amp feature whatever amp this that   Pattern p   Pattern compile  http     v   a-zA-Z0-9   -       amp        String url    http   www youtube com watch v  RCIP6OrQrE   Matcher m   p matcher url trim       trim to remove leading and trailing space if any  if  m matches          url   m group 1             System out println url     this will extract video id from your url  further reference

User · Answer

If you are using Jersey  which I was  my server component needs to make outbound HTTP requests  it contains the following public method   var multiValueMap   UriComponent decodeQuery uri  true    It is part of org glassfish jersey uri UriComponent  and the javadoc is here  Whilst you may not want all of Jersey  it is part of the Jersey common package which isn t too bad on dependencies

User · Answer

I believe we have a better approach to answer this question   1  Define a function that returns Map values   Here we go   public Map lt String  String gt  getUrlValues String url  throws UnsupportedEncodingException       int i   url indexOf           Map lt String  String gt  paramsMap   new HashMap lt  gt         if  i  gt  -1            String searchURL   url substring url indexOf        1           String params     searchURL split   amp              for  String param   params                String temp     param split                   paramsMap put temp 0   java net URLDecoder decode temp 1    UTF-8                          return paramsMap      2  Call your function surrounding with a try catch block  Here we go  try        Map lt String  String gt  values   getUrlValues  https   example com index php form id 9 amp page 1 amp view id 78         String formId   values get  form id         String page   values get  page         String viewId   values get  view id         Log d  FormID   formId        Log d  Page   page        Log d  ViewID   viewId     catch  UnsupportedEncodingException e         Log e  Error   e getMessage

User · Answer

public static String getQueryMap String query                String   params   query split   amp              for  String param   params                      String name   param split      0          if   YourParam  equals name                return param split      1                       return null

User · Answer

I solved the problem like this  public static String getUrlParameterValue String url  String paramName    String value       List lt NameValuePair gt  result   null   try       result   URLEncodedUtils parse new URI url   UTF 8       value   result stream   filter pair - gt  pair getName   equals paramName   findFirst   get   getValue        System out println  -------------- gt    n    paramName           value     n      catch  URISyntaxException e        e printStackTrace       return value

User · Answer

My solution mayble not good          String url    https   www youtube com watch param test amp v XcHJMiSy 1c amp lis test           int start   url indexOf  v    2             int start   url indexOf  list    5    5 is length of   list              int end   url indexOf   amp    start            end    end    -1   url length     end             System out println url substring start  end               result  XcHJMiSy 1c   work fine with    https   www youtube com watch param test amp v XcHJMiSy 1c amp lis test https   www youtube com watch v XcHJMiSy 1c

User · Answer

Assuming the URL syntax will always be http   www youtube com watch v        String v    http   www youtube com watch v  RCIP6OrQrE  substring 31     or disregarding the prefix syntax   String url    http   www youtube com watch v  RCIP6OrQrE   String v   url substring url indexOf  v      2

User · Answer

Import these libraries  import org apache http NameValuePair  import org apache http message BasicNameValuePair    Similar to the verisimilitude  but with the capabilities of handling multivalue parameters  Note  I ve seen HTTP GET requests without a value  in this case the value will be null   public static List lt NameValuePair gt  getQueryMap String query            List lt NameValuePair gt  queryMap   new ArrayList lt NameValuePair gt         String   params   query split Pattern quote   amp            for  String param   params                String   chunks   param split Pattern quote                String name   chunks 0   value   null            if chunks length  gt  1                value   chunks 1                     queryMap add new BasicNameValuePair name  value              return queryMap      Example   GET  bottom gif e235c08 1509896923 amp  49 6E

User · Answer

If you re on Android  you can do this   Uri uri   Uri parse url   String v   uri getQueryParameter  v

[java] Getting URL parameter in java and extract a specific text from that URL

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