httpclient使用cookie

这篇文章主要讲解 httpclient如何使用cookie

我们在使用httpclient模拟登陆时,要保留登陆时服务器返回的cookie,这时我们要使用BasicCookieStore

maven 配置

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<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.5.3</version>
</dependency>

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package org.xxz.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.cookie.Cookie;
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.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

/*
commons-logging-1.2.jar
httpclient-4.5.3.jar
httpcore-4.4.3.jar
httpmime-4.5.3.jar
*/
public class HttpUtil {

private static BasicCookieStore cookieStore = new BasicCookieStore();

// 设置请求超时时间
private static RequestConfig config = RequestConfig.custom()//
.setSocketTimeout(5000) //
.setConnectTimeout(5000) //
.setConnectionRequestTimeout(5000) //
.build();

public static String post(String url, Map<String, String> params) {
HttpPost request = new HttpPost(url);
request.setConfig(config);
buildParams(params, request);
return req(request);
}

private static void buildParams(Map<String, String> params, HttpPost request) {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
if (params != null && params.size() > 0) {
for (Map.Entry<String, String> entry : params.entrySet()) {
nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
try {
request.setEntity(new UrlEncodedFormEntity(nameValuePairs, "utf-8"));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("无效的字符编码", e);
}
}
}

private static String req(HttpUriRequest request) {
CloseableHttpClient httpClient = HttpClients.custom().setDefaultCookieStore(cookieStore).build();
request.addHeader("User-Agent",
"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");

ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
@Override
public String handleResponse(final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
System.out.println("status=" + status);
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
}
};
String responseBody = null;
try {
responseBody = httpClient.execute(request, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("-------" + request.getURI() + "-------");
System.out.println("responseBody=" + responseBody);
printCookie();
return responseBody;
}

private static void printCookie() {
System.out.print("cookies=");
List<Cookie> cookies = cookieStore.getCookies();
if (cookies.isEmpty()) {
System.out.println("None");
} else {
for (int i = 0; i < cookies.size(); i++) {
System.out.print(cookies.get(i).toString());
}
System.out.println("\n------------------------------------------");
}
}

}