add JsonFilePageModelPipeline

webmagic-extension/src/main/java/us/codecraft/webmagic/model/HasKey.java

+package us.codecraft.webmagic.model;
+
+/**
+ * 标志一个Model的key。<br>
+ * 实现了这个接口的Model在输出时会使用getKey()作为标志(例如JsonFilePageModelPipeline中持久化的文件名)。<br>
+ * 如果持久化的文件名是乱码，请再运行的环境变量里加上LANG=zh_CN.UTF-8 。<br>
+ *
+ * @author code4crafter@gmail.com <br>
+ *         Date: 13-8-10 <br>
+ *         Time: 上午7:39 <br>
+ */
+public interface HasKey {
+
+    /**
+     * 在输出时会使用key作为标志(例如JsonFilePageModelPipeline中持久化的文件名)。
+     *
+     * @return key
+     */
+    public String key();
+}

webmagic-extension/src/main/java/us/codecraft/webmagic/pipeline/JsonFilePageModelPipeline.java

+package us.codecraft.webmagic.pipeline;
+
+import com.alibaba.fastjson.JSON;
+import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.log4j.Logger;
+import us.codecraft.webmagic.Task;
+import us.codecraft.webmagic.model.HasKey;
+import us.codecraft.webmagic.model.PageModelPipeline;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * JSON格式持久化到文件的接口。<br>
+ * 如果持久化的文件名是乱码，请再运行的环境变量里加上LANG=zh_CN.UTF-8。<br>
+ *
+ * @author code4crafter@gmail.com <br>
+ *         Date: 13-4-21
+ *         Time: 下午6:28
+ */
+public class JsonFilePageModelPipeline implements PageModelPipeline {
+
+    private String path = "/data/webmagic/";
+
+    private Logger logger = Logger.getLogger(getClass());
+
+    /**
+     * 新建一个FilePipeline，使用默认保存路径"/data/webmagic/"
+     */
+    public JsonFilePageModelPipeline() {
+
+    }
+
+    /**
+     * 新建一个FilePipeline
+     *
+     * @param path 文件保存路径
+     */
+    public JsonFilePageModelPipeline(String path) {
+        if (!path.endsWith("/") && !path.endsWith("\\")) {
+            path += "/";
+        }
+        this.path = path;
+    }
+
+    @Override
+    public void process(Object o, Task task) {
+        String path = this.path + "/" + task.getUUID() + "/";
+        File file = new File(path);
+        if (!file.exists()) {
+            file.mkdirs();
+        }
+        try {
+            String filename;
+            if (o instanceof HasKey) {
+                filename = path + ((HasKey)o).key() + ".json";
+            } else {
+                filename = path + DigestUtils.md5Hex(ToStringBuilder.reflectionToString(o)) + ".json";
+            }
+            PrintWriter printWriter = new PrintWriter(new FileWriter(filename));
+            printWriter.write(JSON.toJSONString(o));
+            printWriter.close();
+        } catch (IOException e) {
+            logger.warn("write file error", e);
+        }
+    }
+}

webmagic-samples/src/main/java/us/codecraft/webmagic/model/samples/OschinaBlog.java

 package us.codecraft.webmagic.model.samples;
 
 import us.codecraft.webmagic.Site;
-import us.codecraft.webmagic.model.ConsolePageModelPipeline;
+import us.codecraft.webmagic.model.HasKey;
 import us.codecraft.webmagic.model.OOSpider;
 import us.codecraft.webmagic.model.annotation.ExtractBy;
 import us.codecraft.webmagic.model.annotation.TargetUrl;
+import us.codecraft.webmagic.pipeline.JsonFilePageModelPipeline;
 
 import java.util.List;
 
@@ -14,7 +15,7 @@ import java.util.List;
  * Time: 上午7:52 <br>
  */
 @TargetUrl("http://my.oschina.net/flashsword/blog/\\d+")
-public class OschinaBlog {
+public class OschinaBlog implements HasKey{
 
     @ExtractBy("//title")
     private String title;
@@ -27,7 +28,23 @@ public class OschinaBlog {
 
     public static void main(String[] args) {
         OOSpider.create(Site.me().addStartUrl("http://my.oschina.net/flashsword/blog")
-                ,new ConsolePageModelPipeline(), OschinaBlog.class).run();
+                ,new JsonFilePageModelPipeline(), OschinaBlog.class).run();
     }
 
+    public String getTitle() {
+        return title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public List<String> getTags() {
+        return tags;
+    }
+
+    @Override
+    public String key() {
+        return title;
+    }
 }