add default values for @Formatter

webmagic-extension/src/main/java/us/codecraft/webmagic/example/OschinaBlog.java

@@ -26,11 +26,11 @@ public class OschinaBlog {
     @ExtractBy(value = "//div[@class='BlogTags']/a/text()", multi = true)
     private List<String> tags;
 
-    @Formatter("yyyy-MM-dd HH:mm")
     @ExtractBy("//div[@class='BlogStat']/regex('\\d+-\\d+-\\d+\\s+\\d+:\\d+')")
     private Date date;
 
     public static void main(String[] args) {
+        //results will be saved to "/data/webmagic/" in json format
         OOSpider.create(Site.me(), new JsonFilePageModelPipeline("/data/webmagic/"), OschinaBlog.class)
                 .addUrl("http://my.oschina.net/flashsword/blog").run();
     }

webmagic-extension/src/main/java/us/codecraft/webmagic/model/annotation/Formatter.java

@@ -21,7 +21,7 @@ public @interface Formatter {
      *
      * @return formatter params
      */
-    String[] value();
+    String[] value() default "";
 
     /**
      * Specific the class of field of class of elements in collection for field. <br/>

webmagic-extension/src/main/java/us/codecraft/webmagic/model/formatter/DateFormatter.java

@@ -10,7 +10,8 @@ import java.util.Date;
  */
 public class DateFormatter implements ObjectFormatter<Date> {
 
-    private String[] datePatterns = new String[]{"yyyy-MM-dd HH:mm"};
+    public static final String[] DEFAULT_PATTERN = new String[]{"yyyy-MM-dd HH:mm"};
+    private String[] datePatterns = DEFAULT_PATTERN;
 
     @Override
     public Date format(String raw) throws Exception {
@@ -24,6 +25,8 @@ public class DateFormatter implements ObjectFormatter<Date> {
 
     @Override
     public void initParam(String[] extra) {
-        datePatterns = extra;
+        if (extra != null && !(extra.length == 1 && extra[0].length() == 0)) {
+            datePatterns = extra;
+        }
     }
 }

webmagic-extension/src/main/resouces/log4j.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
+<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
+
+    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yy-MM-dd HH:mm:ss,SSS} %-5p %c(%F:%L) ## %m%n" />
+        </layout>
+    </appender>
+
+    <logger name="org.apache" additivity="false">
+        <level value="warn" />
+        <appender-ref ref="stdout" />
+    </logger>
+
+    <root>
+        <level value="info" />
+        <appender-ref ref="stdout" />
+    </root>
+
+</log4j:configuration>

webmagic-extension/src/test/resouces/log4j.xml

@@ -8,23 +8,13 @@
         </layout>
     </appender>
 
-    <logger name="org.springframework" additivity="false">
-        <level value="warn" />
-        <appender-ref ref="stdout" />
-    </logger>
-
     <logger name="org.apache" additivity="false">
         <level value="warn" />
         <appender-ref ref="stdout" />
     </logger>
 
-    <logger name="net.sf.ehcache" additivity="false">
-        <level value="warn" />
-        <appender-ref ref="stdout" />
-    </logger>
-
     <root>
-        <level value="debug" />
+        <level value="info" />
         <appender-ref ref="stdout" />
     </root>