Use JAVA to capture web page data and java to capture web pages

Use JAVA to capture web page data and java to capture web pages

1. Use HttpClient to capture webpage data

Public String getHtml (String htmlurl) throws IOException {StringBuffer sb = new StringBuffer (); String acceptEncoding = "";/* 1. generate the HttpClinet object and set the parameter */HttpClient httpClient = new HttpClient (); GetMethod method = new GetMethod (htmlurl); int statusCode; try {statusCode = httpClient.exe cuteMethod (method ); // determine the access status code if (statusCode! = HttpStatus. SC _ OK) {return null;} else {if (method. getResponseHeader ("Content-Encoding ")! = Null) acceptEncoding = method. getResponseHeader ("Content-Encoding "). getValue (); if (acceptEncoding. toLowerCase (). indexOf ("gzip")>-1) {// create the gzip decompression workflow InputStream is; is = method. getResponseBodyAsStream (); GZIPInputStream gzin = new GZIPInputStream (is); InputStreamReader isr = new InputStreamReader (gzin, Charset. forName (CHARSET); // sets the encoding format of the read stream, custom encoding java. io. bufferedReader br = new java. io. bufferedReade R (isr); String tempbf; while (tempbf = br. readLine ())! = Null) {if (StringUtils. isNotBlank (tempbf) {sb. append (tempbf) ;}} isr. close (); gzin. close (); System. out. println (sb);} else {InputStreamReader isr; isr = new InputStreamReader (method. getResponseBodyAsStream (), CHARSET); java. io. bufferedReader br = new java. io. bufferedReader (isr); String tempbf; while (tempbf = br. readLine ())! = Null) {if (StringUtils. isNotBlank (tempbf) {sb. append (tempbf) ;}} isr. close () ;}} catch (HttpException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();} method. abort (); method. releaseConnection (); return sb. toString ();}

 

Ii. Use HttpPost to capture webpage data

private static CloseableHttpClient httpClient;private static BasicHttpContext httpContext;private static BasicCookieStore cookieStore;private static PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();private static RequestConfig globalConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.BEST_MATCH).build();private static RequestConfig localConfig = RequestConfig.copy(globalConfig).setCookieSpec(CookieSpecs.BROWSER_COMPATIBILITY).build();public String getHtml(String url){HttpClientBuilder builder = HttpClients.custom();cookieStore = new BasicCookieStore();builder.setConnectionManager(cm);builder.setDefaultCookieStore(cookieStore);builder.setDefaultRequestConfig(globalConfig);httpClient = builder.build();httpContext = new BasicHttpContext();httpContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);HttpPost httpPost = new HttpPost(url);httpPost.setConfig(localConfig);httpPost.setHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");httpPost.setHeader("Accept-Encoding","gzip, deflate");httpPost.setHeader("Accept-Language","zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");httpPost.setHeader("Connection","keep-alive");httpPost.setHeader("Cookie","ASP.NET_SessionId=11vrr4ucwsgeqtmpyfx4hmvx; _5t_trace_sid=89c4ffb8633d267e4ae322a157b52471; _5t_trace_tms=1; CheckCode=X0P64");httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0"); List <NameValuePair> nvps = new ArrayList <NameValuePair>();        nvps.add(new BasicNameValuePair("pid", "99-C3-57-35-6D-70-3D-F2"));        nvps.add(new BasicNameValuePair("CurrentlyPageIndex", "2"));        httpPost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));try {CloseableHttpResponse response = httpClient.execute(httpPost,httpContext);int status = response.getStatusLine().getStatusCode();if (status >= 200 && status < 300) {HttpEntity httpEntity = response.getEntity();if(httpEntity!=null){String cont = trimLineToString(httpEntity, "UTF-8");EntityUtils.consume(httpEntity);return cont;}}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}public synchronized static String trimLineToString(HttpEntity entiry,String charset) {StringBuffer sb = new StringBuffer();BufferedReader reader = null;try {InputStream instream = entiry.getContent();reader = new BufferedReader(new InputStreamReader(instream, charset));String str = null;while ((str = reader.readLine()) != null) {if(StringUtils.isNotBlank(str)) {sb.append(str.trim());}}instream.close();} catch (IllegalStateException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (reader != null) {try {reader.close();} catch (IOException e) {e.printStackTrace();}}}return sb.toString();}