add cookie support & add docs

webmagic-core/src/main/java/us/codecraft/webmagic/Page.java

@@ -10,6 +10,7 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
+ * Page保存了抓取的结果，并可定义下一次抓取的链接内容。
  * Author: code4crafter@gmail.com
  * Date: 13-4-21
  * Time: 上午11:22
@@ -65,7 +66,7 @@ public class Page {
         }
     }
 
-    public void addTargetRequests(String requestString) {
+    public void addTargetRequest(String requestString) {
         if (StringUtils.isBlank(requestString) || requestString.equals("#")) {
             return;
         }
@@ -75,6 +76,12 @@ public class Page {
         }
     }
 
+    public void addTargetRequest(Request request) {
+        synchronized (targetRequests) {
+            targetRequests.add(request);
+        }
+    }
+
     public Selectable getUrl() {
         return url;
     }

webmagic-core/src/main/java/us/codecraft/webmagic/Request.java

@@ -1,7 +1,22 @@
 package us.codecraft.webmagic;
 
 /**
- * Request对象是
+ * Request对象封装了待抓取的url信息。<br/>
+ * 在PageProcessor中，Request对象可以通过{@link us.codecraft.webmagic.Page#getRequest()} 获取。<br/>
+ * Request对象包含一个extra属性，可以写入一些必须的上下文，这个特性在某些场合会有用。<br/>
+ * <pre>
+ *      Example:
+ *          抓取<a href="${link}">${linktext}</a>时，希望提取链接link，并保存linktext的信息。
+ *      在上一个页面：
+ *      public void process(Page page){
+ *          Request request = new Request(link,linktext);
+ *          page.addTargetRequest(request)
+ *      }
+ *      在下一个页面：
+ *      public void process(Page page){
+ *          String linktext =  (String)page.getRequest().getExtra()[0];
+ *      }
+ * </pre>
  * Author: code4crafter@gmail.com
  * Date: 13-4-21
  * Time: 上午11:37
@@ -12,15 +27,28 @@ public class Request {
 
     private Object[] extra;
 
+    /**
+     * 构建一个request对象
+     * @param url 必须参数，待抓取的url
+     * @param extra 额外参数，可以保存一些需要的上下文信息
+     */
     public Request(String url, Object... extra) {
         this.url = url;
         this.extra = extra;
     }
 
+    /**
+     * 获取预存的对象
+     * @return object[] 预存的对象数组
+     */
     public Object[] getExtra() {
         return extra;
     }
 
+    /**
+     * 获取待抓取的url
+     * @return url 待抓取的url
+     */
     public String getUrl() {
         return url;
     }

webmagic-core/src/main/java/us/codecraft/webmagic/Site.java

@@ -1,9 +1,9 @@
 package us.codecraft.webmagic;
 
-import java.util.HashSet;
+import java.util.*;
-import java.util.Set;
 
 /**
+ * Site定义一个待抓取的站点的各种信息。
  * Author: code4crafter@gmail.com
  * Date: 13-4-21
  * Time: 下午12:13
@@ -14,11 +14,11 @@ public class Site {
 
     private String userAgent;
 
-    private String cookie;
+    private Map<String,String> cookies = new LinkedHashMap<String, String>();
 
     private String encoding;
 
-    private String startUrl;
+    private List<String> startUrls;
 
     private int sleepTime = 3000;
 
@@ -34,8 +34,8 @@ public class Site {
         return new Site();
     }
 
-    public Site setCookie(String cookie) {
+    public Site setCookie(String name,String value) {
-        this.cookie = cookie;
+        cookies.put(name,value);
         return this;
     }
 
@@ -44,8 +44,8 @@ public class Site {
         return this;
     }
 
-    public String getCookie() {
+    public Map<String,String> getCookies() {
-        return cookie;
+        return cookies;
     }
 
     public String getUserAgent() {
@@ -79,12 +79,12 @@ public class Site {
         return this;
     }
 
-    public String getStartUrl() {
+    public List<String> getStartUrls() {
-        return startUrl;
+        return startUrls;
     }
 
     public Site setStartUrl(String startUrl) {
-        this.startUrl = startUrl;
+        this.startUrls.add(startUrl);
         return this;
     }
 
@@ -106,8 +106,8 @@ public class Site {
 
         if (acceptStatCode != null ? !acceptStatCode.equals(site.acceptStatCode) : site.acceptStatCode != null)
             return false;
-        if (cookie != null ? !cookie.equals(site.cookie) : site.cookie != null) return false;
         if (!domain.equals(site.domain)) return false;
+        if (!startUrls.equals(site.startUrls)) return false;
         if (encoding != null ? !encoding.equals(site.encoding) : site.encoding != null) return false;
         if (userAgent != null ? !userAgent.equals(site.userAgent) : site.userAgent != null) return false;
 
@@ -117,8 +117,8 @@ public class Site {
     @Override
     public int hashCode() {
         int result = domain.hashCode();
+        result = 31 * result + (startUrls != null ? startUrls.hashCode() : 0);
         result = 31 * result + (userAgent != null ? userAgent.hashCode() : 0);
-        result = 31 * result + (cookie != null ? cookie.hashCode() : 0);
         result = 31 * result + (encoding != null ? encoding.hashCode() : 0);
         result = 31 * result + (acceptStatCode != null ? acceptStatCode.hashCode() : 0);
         return result;

webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java

@@ -36,7 +36,9 @@ public class Spider implements Runnable {
 
     public Spider processor(PageProcessor pageProcessor) {
         this.pageProcessor = pageProcessor;
-        schedular.push(new Request(pageProcessor.getSite().getStartUrl()), pageProcessor.getSite());
+        for (String startUrl : pageProcessor.getSite().getStartUrls()) {
+            schedular.push(new Request(startUrl), pageProcessor.getSite());
+        }
         return this;
     }
 

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/Downloader.java

@@ -5,7 +5,7 @@ import us.codecraft.webmagic.Request;
 import us.codecraft.webmagic.Site;
 
 /**
- * Downloader是webmagic抓取页面的核心接口。
+ * Downloader是webmagic下载页面的接口。webmagic默认使用了HttpComponent作为下载器，一般情况，你无需自己实现这个接口。
  * Author: code4crafter@gmail.com
  * Date: 13-4-21
  * Time: 下午12:14
@@ -13,10 +13,11 @@ import us.codecraft.webmagic.Site;
 public interface Downloader {
 
     /**
+     * 下载页面，并保存信息到Page对象中。
      *
      * @param request
      * @param site
      * @return
      */
-    public Page download(Request request,Site site);
+    public Page download(Request request, Site site);
 }

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientPool.java

@@ -1,17 +1,22 @@
 package us.codecraft.webmagic.downloader;
 
 import org.apache.http.HttpVersion;
+import org.apache.http.client.CookieStore;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.params.ClientPNames;
 import org.apache.http.client.params.CookiePolicy;
 import org.apache.http.conn.scheme.PlainSocketFactory;
 import org.apache.http.conn.scheme.Scheme;
 import org.apache.http.conn.scheme.SchemeRegistry;
+import org.apache.http.impl.client.BasicCookieStore;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.impl.conn.PoolingClientConnectionManager;
+import org.apache.http.impl.cookie.BasicClientCookie;
 import org.apache.http.params.*;
 import us.codecraft.webmagic.Site;
 
+import java.util.Map;
+
 /**
  * Author: code4crafter@gmail.com
  * Date: 13-4-21
@@ -50,15 +55,23 @@ public class HttpClientPool {
         schemeRegistry.register(new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));
 
         PoolingClientConnectionManager connectionManager = new PoolingClientConnectionManager(schemeRegistry);
-        connectionManager.setMaxTotal(100);
+        connectionManager.setMaxTotal(poolSize);
         connectionManager.setDefaultMaxPerRoute(100);
-        HttpClient httpClient = new DefaultHttpClient(connectionManager, params);
+        DefaultHttpClient httpClient = new DefaultHttpClient(connectionManager, params);
+        generateCookie(httpClient, site);
         httpClient.getParams().setIntParameter("http.socket.timeout", 60000);
         httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BEST_MATCH);
         return httpClient;
     }
 
-    public void pushBack(HttpClient httpClient) {
+    private void generateCookie(DefaultHttpClient httpClient, Site site) {
-
+        CookieStore cookieStore = new BasicCookieStore();
+        for (Map.Entry<String, String> cookieEntry : site.getCookies().entrySet()) {
+            BasicClientCookie cookie = new BasicClientCookie(cookieEntry.getKey(), cookieEntry.getValue());
+            cookie.setDomain(site.getDomain());
+            cookieStore.addCookie(cookie);
+        }
+        httpClient.setCookieStore(cookieStore);
     }
+
 }

webmagic-core/src/test/java/us/codecraft/webmagic/downloader/HttpClientDownloaderTest.java

@@ -0,0 +1,23 @@
+package us.codecraft.webmagic.downloader;
+
+import org.junit.Assert;
+import org.junit.Test;
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Request;
+import us.codecraft.webmagic.Site;
+
+/**
+ * Author: code4crafer@gmail.com
+ * Date: 13-6-18
+ * Time: 上午8:22
+ */
+public class HttpClientDownloaderTest {
+
+    @Test
+    public void testCookie() {
+        Site site = Site.me().setDomain("www.diandian.com").setCookie("t", "yct7q7e6v319wpg4cpxqduu5m77lcgix");
+        HttpClientDownloader httpClientDownloader = new HttpClientDownloader();
+        Page download = httpClientDownloader.download(new Request("http://www.diandian.com"), site);
+        Assert.assertTrue(download.getHtml().toString().contains("flashsword30"));
+    }
+}

webmagic-samples/src/main/java/us/codecraft/webmagic/samples/KaichibaProcessor.java

@@ -14,7 +14,7 @@ public class KaichibaProcessor implements PageProcessor {
     public void process(Page page) {
         //http://progressdaily.diandian.com/post/2013-01-24/40046867275
         int i = Integer.valueOf(page.getUrl().r("shop/(\\d+)").toString()) + 1;
-        page.addTargetRequests("http://kaichiba.com/shop/"+i);
+        page.addTargetRequest("http://kaichiba.com/shop/" + i);
         page.putField("title",page.getHtml().x("//Title"));
         page.putField("items", page.getHtml().xs("//li[@class=\"foodTitle\"]").rp("^\\s+", "").rp("\\s+$", "").rp("<span>.*?</span>", ""));
     }