使用JAVA抓取网页数据

一、使用 HttpClient 抓取网页数据

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public String getHtml(String htmlurl) throws IOException {         StringBuffer sb = new StringBuffer();         String acceptEncoding = "";         /* 1.生成 HttpClinet 对象并设置参数 */         HttpClient httpClient = new HttpClient();         GetMethod method = new GetMethod(htmlurl);         int statusCode;         try {             statusCode = httpClient.executeMethod(method);             // 判断访问的状态码             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) {                     // 建立gzip解压工作流                     InputStream is;                     is = method.getResponseBodyAsStream();                     GZIPInputStream gzin = new GZIPInputStream(is);                     InputStreamReader isr = new InputStreamReader(gzin, Charset.forName(CHARSET)); // 设置读取流的编码格式，自定义编码                     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();                     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();     }

二、使用HttpPost抓取网页数据

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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();     }