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HttpContext能够包含任意的对象,因此在两个不同的线程中共享上下文是不安全的,建议每个线程都一个它自己执行的上下文。
在HTTP请求执行的这一过程中, HttpClient添加了下列属性到执行上下文中:
HttpContext context = <...>
HttpClientContext clientContext = HttpClientContext.adapt(context);
HttpHost target = clientContext.getTargetHost();
HttpRequest request = clientContext.getRequest();
HttpResponse response = clientContext.getResponse();
RequestConfig config = clientContext.getRequestConfig();
代表一个逻辑相关的会话中的多个请求序列应该被同一个HttpContext实例执行,以确保请求之间会话上下文和状态信息的自动传输。
下面的例子中:请求配置在最初被初始化,它将在执行上下文中一直保持。共享与同一个会话中所有连续的请求。
CloseableHttpClient httpclient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom()
.setSocketTimeout(1000)
.setConnectTimeout(1000)
.build();
HttpGet httpget1 = new HttpGet("http://localhost/1");
httpget1.setConfig(requestConfig);
CloseableHttpResponse response1 = httpclient.execute(httpget1, context);
try {
HttpEntity entity1 = response1.getEntity();
} finally {
response1.close();
}
HttpGet httpget2 = new HttpGet("http://localhost/2");
CloseableHttpResponse response2 = httpclient.execute(httpget2, context);
try {
HttpEntity entity2 = response2.getEntity();
} finally {
response2.close();
}
import java.util.List;
import org.apache.http.client.CookieStore;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;
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.util.EntityUtils;
/**
* This example demonstrates the use of a local HTTP context populated with
* custom attributes.
*/
public class ClientCustomContext {
public final static void main(String[] args) throws Exception {
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
// Create a local instance of cookie store
CookieStore cookieStore = new BasicCookieStore();
// Create local HTTP context
HttpClientContext localContext = HttpClientContext.create();
// Bind custom cookie store to the local context
localContext.setCookieStore(cookieStore);
HttpGet httpget = new HttpGet("http://localhost/");
System.out.println("Executing request " + httpget.getRequestLine());
// Pass local context as a parameter
CloseableHttpResponse response = httpclient.execute(httpget, localContext);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
List<Cookie> cookies = cookieStore.getCookies();
for (int i = 0; i < cookies.size(); i++) {
System.out.println("Local cookie: " + cookies.get(i));
}
EntityUtils.consume(response.getEntity());
} finally {
response.close();
}
} finally {
httpclient.close();
}
}
}
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原文链接 : https://chenjazz.blog.csdn.net/article/details/47279521
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