Java tutorial
package cn.wanghaomiao.seimi.core; /* Copyright 2015 Wang Haomiao<et.tw@163.com> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ import cn.wanghaomiao.seimi.annotation.Interceptor; import cn.wanghaomiao.seimi.def.BaseSeimiCrawler; import cn.wanghaomiao.seimi.http.HttpClientFactory; import cn.wanghaomiao.seimi.http.HttpMethod; import cn.wanghaomiao.seimi.struct.BodyType; import cn.wanghaomiao.seimi.struct.CrawlerModel; import cn.wanghaomiao.seimi.struct.Request; import cn.wanghaomiao.seimi.struct.Response; import cn.wanghaomiao.seimi.utils.StrFormatUtil; import cn.wanghaomiao.seimi.utils.StructValidator; import cn.wanghaomiao.xpath.exception.NoSuchAxisException; import cn.wanghaomiao.xpath.exception.NoSuchFunctionException; import cn.wanghaomiao.xpath.exception.XpathSyntaxErrorException; import cn.wanghaomiao.xpath.model.JXDocument; import com.alibaba.fastjson.JSON; import org.apache.commons.lang3.StringUtils; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpHost; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.client.methods.RequestBuilder; import org.apache.http.entity.ContentType; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import org.apache.http.protocol.HttpCoreContext; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.lang.reflect.Method; import java.nio.charset.Charset; import java.util.List; import java.util.Map; import java.util.concurrent.TimeUnit; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * @author [et.tw@163.com] * @since 2015/8/21. */ public class SeimiProcessor implements Runnable { private SeimiQueue queue; private List<SeimiInterceptor> interceptors; private CrawlerModel crawlerModel; private BaseSeimiCrawler crawler; private Logger logger = LoggerFactory.getLogger(getClass()); public SeimiProcessor(List<SeimiInterceptor> interceptors, CrawlerModel crawlerModel) { this.queue = crawlerModel.getQueueInstance(); this.interceptors = interceptors; this.crawlerModel = crawlerModel; this.crawler = crawlerModel.getInstance(); } private Pattern metaRefresh = Pattern.compile( "<(?:META|meta|Meta)\\s+(?:HTTP-EQUIV|http-equiv)\\s*=\\s*\"refresh\".*(?:url|URL)=(\\S*)\".*/?>"); @Override public void run() { while (true) { Request request = null; try { request = queue.bPop(crawlerModel.getCrawlerName()); if (request == null) { continue; } if (crawlerModel == null) { logger.error("No such crawler name:'{}'", request.getCrawlerName()); continue; } if (request.isStop()) { logger.info("SeimiProcessor[{}] will stop!", Thread.currentThread().getName()); break; } // if (!StructValidator.validateAnno(request)) { logger.warn("Request={} is illegal", JSON.toJSONString(request)); continue; } if (!StructValidator.validateAllowRules(crawler.allowRules(), request.getUrl())) { logger.warn("Request={} will be dropped by allowRules=[{}]", JSON.toJSONString(request), StringUtils.join(crawler.allowRules(), ",")); continue; } if (StructValidator.validateDenyRules(crawler.denyRules(), request.getUrl())) { logger.warn("Request={} will be dropped by denyRules=[{}]", JSON.toJSONString(request), StringUtils.join(crawler.denyRules(), ",")); continue; } //???Request??? if (request.getCurrentReqCount() >= request.getMaxReqCount()) { continue; } if (!request.isSkipDuplicateFilter() && crawlerModel.isUseUnrepeated() && queue.isProcessed(request) && request.getCurrentReqCount() == 0) { logger.info("This request has bean processed,so current request={} will be dropped!", JSON.toJSONString(request)); continue; } queue.addProcessed(request); HttpClient hc; if (crawlerModel.isUseCookie()) { hc = HttpClientFactory.getHttpClient(10000, crawler.getCookieStore()); } else { hc = HttpClientFactory.getHttpClient(); } RequestBuilder requestBuilder = RequestGenerator.getHttpRequestBuilder(request, crawlerModel); HttpContext httpContext = new BasicHttpContext(); HttpResponse httpResponse = hc.execute(requestBuilder.build(), httpContext); Response seimiResponse = renderResponse(httpResponse, request, httpContext); Matcher mm = metaRefresh.matcher(seimiResponse.getContent()); int refreshCount = 0; while (!request.isUseSeimiAgent() && mm.find() && refreshCount < 3) { String nextUrl = mm.group(1).replaceAll("'", ""); if (!nextUrl.startsWith("http")) { String prefix = getRealUrl(httpContext); nextUrl = prefix + nextUrl; } logger.info("Seimi refresh url to={} from={}", nextUrl, requestBuilder.getUri()); requestBuilder.setUri(nextUrl); httpResponse = hc.execute(requestBuilder.build(), httpContext); seimiResponse = renderResponse(httpResponse, request, httpContext); mm = metaRefresh.matcher(seimiResponse.getContent()); refreshCount += 1; } Method requestCallback = crawlerModel.getMemberMethods().get(request.getCallBack()); if (requestCallback == null) { continue; } for (SeimiInterceptor interceptor : interceptors) { Interceptor interAnno = interceptor.getClass().getAnnotation(Interceptor.class); if (interAnno.everyMethod() || requestCallback.isAnnotationPresent(interceptor.getTargetAnnotationClass()) || crawlerModel.getClazz() .isAnnotationPresent(interceptor.getTargetAnnotationClass())) { interceptor.before(requestCallback, seimiResponse); } } if (crawlerModel.getDelay() > 0) { TimeUnit.SECONDS.sleep(crawlerModel.getDelay()); } requestCallback.invoke(crawlerModel.getInstance(), seimiResponse); for (SeimiInterceptor interceptor : interceptors) { Interceptor interAnno = interceptor.getClass().getAnnotation(Interceptor.class); if (interAnno.everyMethod() || requestCallback.isAnnotationPresent(interceptor.getTargetAnnotationClass()) || crawlerModel.getClazz() .isAnnotationPresent(interceptor.getTargetAnnotationClass())) { interceptor.after(requestCallback, seimiResponse); } } logger.debug("Crawler[{}] ,url={} ,responseStatus={}", crawlerModel.getCrawlerName(), request.getUrl(), httpResponse.getStatusLine().getStatusCode()); } catch (Exception e) { logger.error(e.getMessage(), e); if (request == null) { continue; } if (request.getCurrentReqCount() < request.getMaxReqCount()) { request.incrReqCount(); queue.push(request); logger.info( "Request process error,req will go into queue again,url={},maxReqCount={},currentReqCount={}", request.getUrl(), request.getMaxReqCount(), request.getCurrentReqCount()); } else if (request.getCurrentReqCount() >= request.getMaxReqCount() && request.getMaxReqCount() > 0) { crawler.handleErrorRequest(request); } } } } private Response renderResponse(HttpResponse httpResponse, Request request, HttpContext httpContext) { Response seimiResponse = new Response(); HttpEntity entity = httpResponse.getEntity(); seimiResponse.setHttpResponse(httpResponse); seimiResponse.setReponseEntity(entity); seimiResponse.setRealUrl(getRealUrl(httpContext)); seimiResponse.setUrl(request.getUrl()); seimiResponse.setRequest(request); seimiResponse.setMeta(request.getMeta()); if (entity != null) { Header referer = httpResponse.getFirstHeader("Referer"); if (referer != null) { seimiResponse.setReferer(referer.getValue()); } if (!entity.getContentType().getValue().contains("image")) { seimiResponse.setBodyType(BodyType.TEXT); try { seimiResponse.setData(EntityUtils.toByteArray(entity)); ContentType contentType = ContentType.get(entity); Charset charset = contentType.getCharset(); if (charset == null) { seimiResponse.setContent(new String(seimiResponse.getData(), "ISO-8859-1")); String docCharset = renderRealCharset(seimiResponse); seimiResponse.setContent( new String(seimiResponse.getContent().getBytes("ISO-8859-1"), docCharset)); seimiResponse.setCharset(docCharset); } else { seimiResponse.setContent(new String(seimiResponse.getData(), charset)); seimiResponse.setCharset(charset.name()); } } catch (Exception e) { e.printStackTrace(); logger.error("no content data"); } } else { seimiResponse.setBodyType(BodyType.BINARY); try { seimiResponse.setData(EntityUtils.toByteArray(entity)); seimiResponse.setContent(StringUtils.substringAfterLast(request.getUrl(), "/")); } catch (Exception e) { logger.error("no data can be read from httpResponse"); } } } return seimiResponse; } private String renderRealCharset(Response response) throws NoSuchFunctionException, XpathSyntaxErrorException, NoSuchAxisException { String charset; JXDocument doc = response.document(); charset = StrFormatUtil.getFirstEmStr(doc.sel("//meta[@charset]/@charset"), "").trim(); if (StringUtils.isBlank(charset)) { charset = StrFormatUtil.getFirstEmStr(doc.sel("//meta[@http-equiv='charset']/@content"), "").trim(); } if (StringUtils.isBlank(charset)) { String ct = StringUtils.join(doc.sel( "//meta[@http-equiv='Content-Type']/@content|//meta[@http-equiv='content-type']/@content"), ";") .trim(); charset = StrFormatUtil.parseCharset(ct.toLowerCase()); } return StringUtils.isNotBlank(charset) ? charset : "UTF-8"; } private String getRealUrl(HttpContext httpContext) { Object target = httpContext.getAttribute(HttpCoreContext.HTTP_TARGET_HOST); Object reqUri = httpContext.getAttribute(HttpCoreContext.HTTP_REQUEST); if (target == null || reqUri == null) { return null; } HttpHost t = (HttpHost) target; HttpUriRequest r = (HttpUriRequest) reqUri; return r.getURI().isAbsolute() ? r.getURI().toString() : t.toString() + r.getURI().toString(); } }