httpclient 登陸成功後返回的cookie值訪問下一頁面

HttpClient4.x能夠自帶維持會話功能，只要使用同一個HttpClient且未關閉鏈接，則能夠使用相同會話來訪問其餘要求登陸驗證的服務（見TestLogin()方法中的「執行get請求」部分）。

若是須要使用HttpClient池，而且想要作到一次登陸的會話供多個HttpClient鏈接使用，就須要本身保存會話信息。由於客戶端的會話信息是保存在cookie中的（JSESSIONID），因此只須要將登陸成功返回的cookie複製到各個HttpClient使用便可。使用Cookie的方法有兩種，能夠本身使用CookieStore來保存（見TestCookieStore()方法），也能夠經過HttpClientContext上下文來維持（見TestContext()方法）。

 

package com.sunbin.httpSession; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import org.apache.http.HeaderIterator; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.ParseException; import org.apache.http.client.CookieStore; import org.apache.http.client.config.CookieSpecs; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.protocol.HttpClientContext; import org.apache.http.config.Registry; import org.apache.http.config.RegistryBuilder; import org.apache.http.cookie.CookieSpecProvider; import org.apache.http.impl.client.BasicCookieStore; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.cookie.BasicClientCookie; import org.apache.http.impl.cookie.BestMatchSpecFactory; import org.apache.http.impl.cookie.BrowserCompatSpecFactory; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import org.junit.Test; public class TestHttpClient { // 建立CookieStore實例
  static CookieStore cookieStore = null; static HttpClientContext context = null; String loginUrl = "http://127.0.0.1:8080/CwlProClient/j_spring_security_check"; String testUrl = "http://127.0.0.1:8080/CwlProClient/account/querySubAccount.action"; String loginErrorUrl = "http://127.0.0.1:8080/CwlProClient/login/login.jsp"; @Test public void testLogin() throws Exception { System.out.println("----testLogin"); // // 建立HttpClientBuilder // HttpClientBuilder httpClientBuilder = HttpClientBuilder.create(); // // HttpClient // CloseableHttpClient client = httpClientBuilder.build(); // 直接建立client
    CloseableHttpClient client = HttpClients.createDefault(); HttpPost httpPost = new HttpPost(loginUrl); Map parameterMap = new HashMap(); parameterMap.put("j_username", "sunb012"); parameterMap.put("j_password", "sunb012"); UrlEncodedFormEntity postEntity = new UrlEncodedFormEntity( getParam(parameterMap), "UTF-8"); httpPost.setEntity(postEntity); System.out.println("request line:" + httpPost.getRequestLine()); try { // 執行post請求
      HttpResponse httpResponse = client.execute(httpPost); String location = httpResponse.getFirstHeader("Location") .getValue(); if (location != null && location.startsWith(loginErrorUrl)) { System.out.println("----loginError"); } printResponse(httpResponse); // 執行get請求
      System.out.println("----the same client"); HttpGet httpGet = new HttpGet(testUrl); System.out.println("request line:" + httpGet.getRequestLine()); HttpResponse httpResponse1 = client.execute(httpGet); printResponse(httpResponse1); // cookie store
 setCookieStore(httpResponse); // context
 setContext(); } catch (IOException e) { e.printStackTrace(); } finally { try { // 關閉流並釋放資源
 client.close(); } catch (IOException e) { e.printStackTrace(); } } } @Test public void testContext() throws Exception { System.out.println("----testContext"); // 使用context方式
    CloseableHttpClient client = HttpClients.createDefault(); HttpGet httpGet = new HttpGet(testUrl); System.out.println("request line:" + httpGet.getRequestLine()); try { // 執行get請求
      HttpResponse httpResponse = client.execute(httpGet, context); System.out.println("context cookies:"
          + context.getCookieStore().getCookies()); printResponse(httpResponse); } catch (IOException e) { e.printStackTrace(); } finally { try { // 關閉流並釋放資源
 client.close(); } catch (IOException e) { e.printStackTrace(); } } } @Test public void testCookieStore() throws Exception { System.out.println("----testCookieStore"); // 使用cookieStore方式
    CloseableHttpClient client = HttpClients.custom() .setDefaultCookieStore(cookieStore).build(); HttpGet httpGet = new HttpGet(testUrl); System.out.println("request line:" + httpGet.getRequestLine()); try { // 執行get請求
      HttpResponse httpResponse = client.execute(httpGet); System.out.println("cookie store:" + cookieStore.getCookies()); printResponse(httpResponse); } catch (IOException e) { e.printStackTrace(); } finally { try { // 關閉流並釋放資源
 client.close(); } catch (IOException e) { e.printStackTrace(); } } } public static void printResponse(HttpResponse httpResponse) throws ParseException, IOException { // 獲取響應消息實體
    HttpEntity entity = httpResponse.getEntity(); // 響應狀態
    System.out.println("status:" + httpResponse.getStatusLine()); System.out.println("headers:"); HeaderIterator iterator = httpResponse.headerIterator(); while (iterator.hasNext()) { System.out.println("\t" + iterator.next()); } // 判斷響應實體是否爲空
    if (entity != null) { String responseString = EntityUtils.toString(entity); System.out.println("response length:" + responseString.length()); System.out.println("response content:"
          + responseString.replace("\r\n", "")); } } public static void setContext() { System.out.println("----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) { System.out.println("----setCookieStore"); cookieStore = new BasicCookieStore(); // JSESSIONID
    String setCookie = httpResponse.getFirstHeader("Set-Cookie") .getValue(); String JSESSIONID = setCookie.substring("JSESSIONID=".length(), setCookie.indexOf(";")); System.out.println("JSESSIONID:" + JSESSIONID); // 新建一個Cookie
    BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", JSESSIONID); cookie.setVersion(0); cookie.setDomain("127.0.0.1"); cookie.setPath("/CwlProClient"); // cookie.setAttribute(ClientCookie.VERSION_ATTR, "0"); // cookie.setAttribute(ClientCookie.DOMAIN_ATTR, "127.0.0.1"); // cookie.setAttribute(ClientCookie.PORT_ATTR, "8080"); // cookie.setAttribute(ClientCookie.PATH_ATTR, "/CwlProWeb");
 cookieStore.addCookie(cookie); } public static List<NameValuePair> getParam(Map 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; } }