HttpClient4 获取cookie

大家好，又见面了，我是你们的朋友全栈君。

HttpClient4.x可以自带维持会话功能，只要使用同一个HttpClient且未关闭连接，则可以使用相同会话来访问其他要求登录验证的服务（见TestLogin()方法中的“执行get请求”部分）。
如果需要使用HttpClient池，并且想要做到一次登录的会话供多个HttpClient连接使用，就需要自己保存会话信息。因为客户端的会话信息是保存在cookie中的（JSESSIONID），所以只需要将登录成功返回的cookie复制到各个HttpClient使用即可。
使用Cookie的方法有两种，可以自己使用CookieStore来保存（见TestCookieStore()方法），也可以通过HttpClientContext上下文来维持（见TestContext()方法）。
附带HttpClient4.3示例代码 http://www.myexception.cn/program/1459749.html 。
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 {
// 创建CookieStore实例
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");
// // 创建HttpClientBuilder
// HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
// // HttpClient
// CloseableHttpClient client = httpClientBuilder.build();
// 直接创建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 {
// 执行post请求
HttpResponse httpResponse = client.execute(httpPost);
String location = httpResponse.getFirstHeader("Location")
.getValue();
if (location != null && location.startsWith(loginErrorUrl)) {
System.out.println("----loginError");
}
printResponse(httpResponse);
// 执行get请求
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 {
// 关闭流并释放资源
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 {
// 执行get请求
HttpResponse httpResponse = client.execute(httpGet, context);
System.out.println("context cookies:"
+ context.getCookieStore().getCookies());
printResponse(httpResponse);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 关闭流并释放资源
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 {
// 执行get请求
HttpResponse httpResponse = client.execute(httpGet);
System.out.println("cookie store:" + cookieStore.getCookies());
printResponse(httpResponse);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 关闭流并释放资源
client.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void printResponse(HttpResponse httpResponse)
throws ParseException, IOException {
// 获取响应消息实体
HttpEntity entity = httpResponse.getEntity();
// 响应状态
System.out.println("status:" + httpResponse.getStatusLine());
System.out.println("headers:");
HeaderIterator iterator = httpResponse.headerIterator();
while (iterator.hasNext()) {
System.out.println("\t" + iterator.next());
}
// 判断响应实体是否为空
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);
// 新建一个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;
}
}