java 實現(xiàn)通過 post 方式提交json參數(shù)操作
由于所爬取的網(wǎng)站需要驗證碼,通過網(wǎng)頁的開發(fā)人員工具【F12】及在線http post,get接口測試請求工具(http://coolaf.com/)發(fā)現(xiàn)訪問時加上請求頭header 信息時可以跳過驗證碼校驗。
而且該網(wǎng)站只接受post請求,對提交的參數(shù)也只接受json格式,否則請求失敗。
現(xiàn)將通過 post 方式提交json參數(shù)的方法記錄如下:
import java.io.UnsupportedEncodingException; import java.net.URI; import java.net.URLDecoder; import java.util.ArrayList; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.client.utils.URIBuilder; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; /** * <p>@PostJsonParamsTest.java</p> * @version 1.0 * @author zxk * @Date 2018-3-3 */ public class PostJsonParamsTest { // 超時時間 private static final int RUN_TIME =10000; // 爬取初始頁數(shù) private String page; public static void main(String[] args) throws Exception { PostJsonParamsTest crawl = new PostJsonParamsTest(); // 請求的url地址 String url ="http://www.gzcredit.gov.cn/Service/CreditService.asmx/searchOrgWithPage"; // 設(shè)置起始訪問頁碼 crawl.setPage("1"); String isStop = ""; // 設(shè)置請求 HttpRequestBase request = null; request = new HttpPost(url); try { // 設(shè)置config RequestConfig requestConfig = RequestConfig.custom() .setSocketTimeout(RUN_TIME) .setConnectTimeout(RUN_TIME) .setConnectionRequestTimeout(RUN_TIME) .build(); request.setConfig(requestConfig); // json 格式的 post 參數(shù) String postParams ="{\"condition\":{\"qymc\":\"%%%%\",\"cydw\":\"\"},\"pageNo\":"+crawl.getPage()+",\"pageSize\":100,count:2709846}"; System.out.println(postParams); HttpEntity httpEntity = new StringEntity(postParams); ((HttpPost) request).setEntity(httpEntity); // 添加請求頭,可以繞過驗證碼 request.addHeader("Accept","application/json, text/javascript, */*"); request.addHeader("Accept-Encoding","gzip, deflate"); request.addHeader("Accept-Language", "zh-CN,zh;q=0.8"); request.addHeader("Connection", "keep-alive"); request.addHeader("Host", "www.gzcredit.gov.cn"); request.addHeader("Content-Type", "application/json; charset=UTF-8"); URIBuilder builder = new URIBuilder(url); URI uri = builder.build(); uri = new URI(URLDecoder.decode(uri.toString(), "UTF-8")); request.setURI(uri); while(!isStop.equals("停止")||isStop.equals("重跑")){ isStop = crawl.crawlList(request); if(isStop.equals("爬取")){ crawl.setPage(String.valueOf(Integer.parseInt(crawl.getPage())+1)); } // if("2713".equals(crawl.getPage())) break; if("2".equals(crawl.getPage())){ break; } } } catch (NumberFormatException e) { e.printStackTrace(); throw new NumberFormatException("數(shù)字格式錯誤"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); throw new UnsupportedEncodingException("不支持的編碼集"); } } /** * 爬取搜索列表 * @param page * @return */ private String crawlList(HttpRequestBase request){ int statusCode = 0; // 下面兩種方式都可以用來創(chuàng)建客戶端連接,相當(dāng)于打開了一個瀏覽器 CloseableHttpClient httpClient = HttpClients.createDefault(); // HttpClient httpClient = HttpClientBuilder.create().build(); HttpEntity httpEntity = null; HttpResponse response = null; try { try { response = httpClient.execute(request); } catch (Exception e){ e.printStackTrace(); EntityUtils.consumeQuietly(httpEntity); return "重跑"; } //打印狀態(tài) statusCode =response.getStatusLine().getStatusCode(); if(statusCode!=200){ EntityUtils.consumeQuietly(httpEntity); return "重跑"; } //實體 httpEntity = response.getEntity(); String searchListStr = EntityUtils.toString(httpEntity,"GBK").replaceAll("\\\\米", "米"); String allData = (String) JSONObject.parseObject(searchListStr).get("d"); // 字符串值中間含雙引號的替換處理 String s = allData.replaceAll("\\{\"","{'") .replaceAll("\":\"", "':'") .replaceAll("\",\"", "','") .replaceAll("\":", "':") .replaceAll(",\"", ",'") .replaceAll("\"\\}", "'}") .replaceAll("\"", "") .replaceAll("'", "\"") .replaceAll("<br />", "") .replaceAll("\t", "") .replaceAll("\\\\", "?"); JSONObject jsonData = JSONObject.parseObject(s); JSONArray jsonContent = jsonData.getJSONArray("orgList"); searchListStr = null; allData = null; s = null; if (jsonContent==null || jsonContent.size()<1) { return "重跑"; } System.out.println(jsonContent.toJSONString()); return "爬取"; } catch (Exception e) { e.printStackTrace(); return "重跑"; } finally{ EntityUtils.consumeQuietly(httpEntity); } } private String getPage() { return page; } private void setPage(String page) { this.page = page; } }
補充知識:JAVA利用HttpClient發(fā)送post請求,將請求數(shù)據(jù)放到body里
我就廢話不多說了,大家還是直接看代碼吧~
/** * post請求 ,請求數(shù)據(jù)放到body里 * @param url 請求地址 * @param bodyData 參數(shù) * @author wangyj * @date 2019年4月20日 */ public static String doPostBodyData(String url, String bodyData) throws Exception{ String result = ""; CloseableHttpClient httpClient = null; CloseableHttpResponse response = null; try { HttpPost httpPost = getHttpPost(url, null); // 請求地址 httpPost.setEntity(new StringEntity(bodyData, Encoding)); httpClient = getHttpClient(); // 得到返回的response response = httpClient.execute(httpPost); HttpEntity entity = response.getEntity(); result = getResult(entity, Encoding); } catch (Exception e) { throw e; } finally { // 關(guān)閉httpClient if (null != httpClient) { httpClient.close(); } // 關(guān)閉response if (null != response) { EntityUtils.consume(response.getEntity()); // 會自動釋放連接 response.close(); } } return result; }
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