HttpClient---cookie（保持登录）

public class APIMthod { // 创建CookieStore实例 private static CookieStore cookieStore = null; private static HttpClientContext context = null; private static String response = ""; public static String sendGetByHttpCient(String url){ HttpResponse httpResponse = null; CloseableHttpClient client = HttpClients.custom().setDefaultCookieStore(cookieStore).build(); try { HttpGet httpGet = new HttpGet(url); httpResponse = client.execute(httpGet); response = printResponse(httpResponse); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally { try { // 关闭流并释放资源 client.close(); } catch (IOException e) { e.printStackTrace(); } } return response; } public static String sendPostByHttpCient(String url, Map<String, String> parameterMap){ HttpResponse httpResponse = null; UrlEncodedFormEntity postEntity = null; CloseableHttpClient client = HttpClients.custom().setDefaultCookieStore(cookieStore).build(); try { HttpPost httpPost = new HttpPost(url); postEntity = new UrlEncodedFormEntity(getParam(parameterMap), "UTF-8"); httpPost.setEntity(postEntity); httpResponse = client.execute(httpPost); response = printResponse(httpResponse); if (cookieStore == null || "".equals(cookieStore)) { String host = httpPost.getURI().getHost(); setCookieStore(httpResponse, host); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally { try { // 关闭流并释放资源 client.close(); } catch (IOException e) { e.printStackTrace(); } } return response; } public static String printResponse(HttpResponse httpResponse) throws ParseException, IOException { String responseString = ""; // 获取响应消息实体 HttpEntity entity = httpResponse.getEntity(); // 判断响应实体是否为空 if (entity != null) { responseString = EntityUtils.toString(entity); } return responseString; } public static void setContext() { context = HttpClientContext.create(); Registry<CookieSpecProvider> registry = RegistryBuilder .<CookieSpecProvider> create() .register(CookieSpecs.BEST_MATCH, new BestMatchSpecFactory()) .register(CookieSpecs.BROWSER_COMPATIBILITY, new BrowserCompatSpecFactory()).build(); context.setCookieSpecRegistry(registry); context.setCookieStore(cookieStore); } public static void setCookieStore(HttpResponse httpResponse,String host) { cookieStore = new BasicCookieStore(); // JSESSIONID if (null == httpResponse.getFirstHeader("Set-Cookie")) { cookieStore = null; }else { String setCookie = httpResponse.getFirstHeader("Set-Cookie").getValue(); String JSESSIONID = setCookie.substring("JSESSIONID=".length(),setCookie.indexOf(";")); // 新建一个Cookie BasicClientCookie cookie = new BasicClientCookie("JSESSIONID",JSESSIONID); cookie.setVersion(0); cookie.setDomain(host); cookie.setPath("/"); cookieStore.addCookie(cookie); } } public static List<Cookie> getCookies(){ if (null == cookieStore) { return null; } return cookieStore.getCookies(); } public static void deleteCookies(){ if (cookieStore != null) { cookieStore.clear(); cookieStore = null; } } public static List<NameValuePair> getParam(Map<String, String> parameterMap) { List<NameValuePair> param = new ArrayList<NameValuePair>(); Iterator it = parameterMap.entrySet().iterator(); while (it.hasNext()) { Entry parmEntry = (Entry) it.next(); param.add(new BasicNameValuePair((String) parmEntry.getKey(),(String) parmEntry.getValue())); } return param; }