本文研究的主要是java网络爬虫连接超时的问题，具体如下。
在网络爬虫中，经常会遇到如下报错。即连接超时。针对此问题，一般解决思路为：将连接时间、请求时间设置长一下。如果出现连接超时的情况，则在重新请求【设置重新请求次数】。
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
下面的代码便是使用httpclient解决连接超时的样例程序。直接上程序。
package daili;import java.io.IOException;import java.net.URI;import org.apache.http.HttpRequest;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.params.CookiePolicy;import org.apache.http.client.protocol.ClientContext;import org.apache.http.impl.client.BasicCookieStore;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;import org.apache.http.impl.client.HttpClients;import org.apache.http.impl.cookie.BasicClientCookie2;import org.apache.http.params.HttpConnectionParams;import org.apache.http.params.HttpParams;import org.apache.http.protocol.BasicHttpContext;import org.apache.http.protocol.ExecutionContext;import org.apache.http.protocol.HttpContext;import org.apache.http.util.EntityUtils;/* * author:合肥工业大学 管院学院 钱洋 *[email protected]*/public class Test1 {public static void main(String[] args) throws ClientProtocolException, IOException, InterruptedException {getRawHTML("http://club.autohome.com.cn/bbs/forum-c-2098-1.html#pvareaid=103447");}public static String getRawHTML ( String url ) throws ClientProtocolException, IOException, InterruptedException{//初始化DefaultHttpClient httpclient = new DefaultHttpClient();httpclient.getParams().setParameter("http.protocol.cookie-policy", CookiePolicy.BROWSER_COMPATIBILITY);//设置参数HttpParams params = httpclient.getParams();//连接时间HttpConnectionParams.setConnectionTimeout(params, 6000);HttpConnectionParams.setSoTimeout(params, 6000*20);//超时重新请求次数DefaultHttpRequestRetryHandler dhr = new DefaultHttpRequestRetryHandler(5,true);HttpContext localContext = new BasicHttpContext();HttpRequest request2 = (HttpRequest) localContext.getAttribute( ExecutionContext.HTTP_REQUEST);httpclient.setHttpRequestRetryHandler(dhr);BasicCookieStore cookieStore = new BasicCookieStore();BasicClientCookie2 cookie = new BasicClientCookie2("Content-Type","text/html;charset=UTF-8");BasicClientCookie2 cookie1 = new BasicClientCookie2("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36");cookieStore.addCookie(cookie);cookieStore.addCookie(cookie1);localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);HttpGet request = new HttpGet();request.setURI(URI.create(url));HttpResponse response = null;String rawHTML = "";response = httpclient.execute(request,localContext);int StatusCode = response.getStatusLine().getStatusCode();//获取响应状态码System.out.println(StatusCode);if(StatusCode == 200){//状态码200表示响应成功//获取实体内容rawHTML = EntityUtils.toString (response.getEntity());System.out.println(rawHTML);//输出实体内容EntityUtils.consume(response.getEntity());//消耗实体} else {//关闭HttpEntity的流实体EntityUtils.consume(response.getEntity());//消耗实体Thread.sleep(20*60*1000);//如果报错先休息30分钟}httpclient.close();System.out.println(rawHTML);return rawHTML;}}
结果：
总结
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