修改SmartContentSelector threshold可定制化 (#1183)

* 修改SmartContentSelector threshold可定制化

* 修改SmartContentSelector threshold可定制化

---------

Co-authored-by: zhaoyiwei <zhaoyiwei@zhongan.com>

webmagic-core/src/main/java/us/codecraft/webmagic/selector/HtmlNode.java

@@ -31,6 +31,11 @@ public class HtmlNode extends AbstractSelectable {
         return select(smartContentSelector, getSourceTexts());
     }
 
+    public Selectable smartContent(int threshold) {
+        SmartContentSelector smartContentSelector = Selectors.smartContent(threshold);
+        return select(smartContentSelector, getSourceTexts());
+    }
+
     @Override
     public Selectable links() {
         return selectElements(new LinksSelector());

webmagic-core/src/main/java/us/codecraft/webmagic/selector/Selectors.java

@@ -20,6 +20,10 @@ public abstract class Selectors {
         return new SmartContentSelector();
     }
 
+    public static SmartContentSelector smartContent(int threshold) {
+        return new SmartContentSelector(threshold);
+    }
+
     public static CssSelector $(String expr) {
         return new CssSelector(expr);
     }

webmagic-core/src/main/java/us/codecraft/webmagic/selector/SmartContentSelector.java

@@ -16,9 +16,15 @@ import java.util.List;
 @Experimental
 public class SmartContentSelector implements Selector {
 
+    private int threshold = 86;
+
     public SmartContentSelector() {
     }
 
+    public SmartContentSelector(int threshold) {
+        this.threshold = threshold;
+    }
+
     @Override
     public String select(String html) {
         html = html.replaceAll("(?is)<!DOCTYPE.*?>", "");
@@ -29,7 +35,6 @@ public class SmartContentSelector implements Selector {
         html = html.replaceAll("(?is)<.*?>", "");
         List<String> lines;
         int blocksWidth =3;
-        int threshold =86;
         int start;
         int end;
         StringBuilder text = new StringBuilder();