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(); } |
