httpclient4

新手求助，httpclient连接超时

提示：

新手求助，httpclient连接超时

有时使用httpclient的时候，需要等待N长时间，可能此时你决定放弃或者重试。实现上非常简单添加一个参数即可


//这里的超时单位是毫秒。这里的http.socket.timeout相当于SO_TIMEOUT
httpClient.getParams().setIntParameter("http.socket.timeout",3000);


HttpConnectionManagerParams managerParams
= httpClient.getHttpConnectionManager().getParams();
// 设置连接超时时间(单位毫秒)
managerParams.setConnectionTimeout(30000);
// 设置读数据超时时间(单位毫秒)
managerParams.setSoTimeout(120000);



1，设置get方法请求超时为 5 秒



GetMethod getMethod= new GetMethod(url);
getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,5000 );



2，设置 Http 连接超时为5秒




HttpClient httpClient= new HttpClient();
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000 );



设置连接超时和请求超时，这两个超时的意义不同，需要分别设置。

httpclient4.5 connectionrequesttimeout是什么超时

提示：

httpclient4.5 connectionrequesttimeout是什么超时

从连接池获取连接的超时时间，如果连接池里连接都被用了，且超过这个connectionrequesttimeout，会抛出超时异常

连接超时是ConnectTimeout
读取超时是SocketTimeout

具体写法：
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(5000).setConnectTimeout(5000).setSocketTimeout(30000)
.build();

httpclient 怎么带上登录成功后返回的cookie值访问下一页面

提示：

httpclient 怎么带上登录成功后返回的cookie值访问下一页面

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）。 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 registry = RegistryBuilder . 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 getParam(Map parameterMap) { List param = new ArrayList(); 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; }}