Use httpclient to obtain the webpage source code

Required package: commons-codec-1.3.jar commons-httpclient-3.1.jar

 /**  * GET html *  @ Param  URL *  @ Param  Timeout *  @ Param  Charset *  @ Return       */      Public   Static String gethtmlbyurl (string URL, Int  Timeout, string charset ){ If (Charset = Null  ) Charset = "UTF-8" ; Httpmethod result = New  Getmethod (URL );  Return  Dohttp (result, timeout, charset );}  /**  * HTML is obtained through post *  @ Param  URL *  @ Param  Timeout * @ Param  Charset *  @ Param  Params *  @ Return       */      Public   Static String gethtmlbyurl (string URL, Int Timeout, string charset, Map <string, string> Params ){  If (Charset = Null  ) Charset = "UTF-8"; Postmethod result = New  Postmethod (URL); namevaluepair [] namevalues = New  Namevaluepair [Params. Size ()]; namevaluepair simcard; string [] keys = Params. keyset (). toarray ( New  String [Params. Size ()]); string key;  For ( Int I = 0; I <keys. length; I ++ ) {Key = Keys [I]; simcard =New  Namevaluepair (Key, Params. Get (key); namevalues [I] = Simcard;} result. setrequestbody (namevalues );  Return  Dohttp (result, timeout, charset );}  Public   Static String dohttp (httpmethod result, Int  Timeout, string charset) {httpclient Client = New  Httpclient ();  Try {Httpconnectionmanagerparams managerparams = Client. gethttpconnectionmanager (). getparams (); managerparams. setconnectiontimeout (timeout); client.exe cutemethod (result); inputstream resstream = Result. getresponsebodyasstream (); bufferedreader br = New Bufferedreader ( New  Inputstreamreader (resstream, charset); stringbuffer resbuffer = New  Stringbuffer (); string restemp = "" ;  While (Restemp = Br. Readline ())! = Null  ) {Resbuffer. append (restemp );}  Return  Resbuffer. tostring ();}  Catch  (Httpexception e ){  Return   Null  ;}  Catch (Ioexception e ){  Return   Null  ;}  Catch  (Exception e ){  Return   Null  ;}  Finally  {Result. releaseconnection ();}}