diff --git a/webmagic-extension/src/main/java/us/codecraft/webmagic/model/PageModelExtractor.java b/webmagic-extension/src/main/java/us/codecraft/webmagic/model/PageModelExtractor.java
index 375fe5f..8f7a625 100644
--- a/webmagic-extension/src/main/java/us/codecraft/webmagic/model/PageModelExtractor.java
+++ b/webmagic-extension/src/main/java/us/codecraft/webmagic/model/PageModelExtractor.java
@@ -128,7 +128,7 @@ class PageModelExtractor {
 
             FieldExtractor.Source source = null;
             switch (extractBy.source()){
-                case  RawText:
+                case RawText:
                     source = FieldExtractor.Source.RawText;
                     break;
                 case RawHtml:
@@ -144,10 +144,7 @@ class PageModelExtractor {
 
             fieldExtractor = new FieldExtractor(field, selector, source,
                     extractBy.notNull(), List.class.isAssignableFrom(field.getType()));
-            Method setterMethod = getSetterMethod(clazz, field);
-            if (setterMethod != null) {
-                fieldExtractor.setSetterMethod(setterMethod);
-            }
+            fieldExtractor.setSetterMethod(getSetterMethod(clazz, field));
         }
         return fieldExtractor;
     }
diff --git a/webmagic-extension/src/main/java/us/codecraft/webmagic/utils/ExtractorUtils.java b/webmagic-extension/src/main/java/us/codecraft/webmagic/utils/ExtractorUtils.java
index 54a4439..d3fc423 100644
--- a/webmagic-extension/src/main/java/us/codecraft/webmagic/utils/ExtractorUtils.java
+++ b/webmagic-extension/src/main/java/us/codecraft/webmagic/utils/ExtractorUtils.java
@@ -25,22 +25,17 @@ public class ExtractorUtils {
                 selector = new RegexSelector(value);
                 break;
             case XPath:
-                selector = getXpathSelector(value);
+                selector = new XpathSelector(value);
                 break;
             case JsonPath:
                 selector = new JsonPathSelector(value);
                 break;
             default:
-                selector = getXpathSelector(value);
+                selector = new XpathSelector(value);
         }
         return selector;
     }
 
-    private static Selector getXpathSelector(String value) {
-        Selector selector = new XpathSelector(value);
-        return selector;
-    }
-
     public static List<Selector> getSelectors(ExtractBy[] extractBies) {
         List<Selector> selectors = new ArrayList<Selector>();
         if (extractBies == null) {
diff --git a/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageModelExtractorTest.java b/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageModelExtractorTest.java
index 87f0807..192856f 100644
--- a/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageModelExtractorTest.java
+++ b/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageModelExtractorTest.java
@@ -4,6 +4,7 @@ import org.apache.commons.lang3.time.DateFormatUtils;
 import org.apache.commons.lang3.time.DateUtils;
 import org.junit.Test;
 import us.codecraft.webmagic.model.annotation.ExtractBy;
+import us.codecraft.webmagic.model.annotation.ExtractByUrl;
 import us.codecraft.webmagic.model.annotation.Formatter;
 import us.codecraft.webmagic.model.formatter.DateFormatter;
 
@@ -74,6 +75,20 @@ public class PageModelExtractorTest {
 
     }
 
+    public static class ModelJsonStr {
+
+        @ExtractBy(type = ExtractBy.Type.JsonPath, value = "$.name",source = ExtractBy.Source.RawText)
+        private String name;
+
+    }
+
+    public static class ModelUrl {
+
+        @ExtractByUrl("https://api\\.github\\.com/repos/\\w+/(\\w+)")
+        private String name;
+
+    }
+
     @Test
     public void testXpath() throws Exception {
         ModelDateStr modelDate = (ModelDateStr) PageModelExtractor.create(ModelDateStr.class).process(pageMocker.getMockPage());
@@ -115,4 +130,16 @@ public class PageModelExtractorTest {
         ModelCustomList modelDate = (ModelCustomList) PageModelExtractor.create(ModelCustomList.class).process(pageMocker.getMockPage());
         assertThat(modelDate.dates).containsExactly(DateUtils.parseDate("20170601", "yyyyMMdd"), DateUtils.parseDate("20170602", "yyyyMMdd"), DateUtils.parseDate("20170603", "yyyyMMdd"), DateUtils.parseDate("20170604", "yyyyMMdd"));
     }
+
+    @Test
+    public void testExtractJson() throws Exception {
+        ModelJsonStr modelDate = (ModelJsonStr) PageModelExtractor.create(ModelJsonStr.class).process(pageMocker.getMockJsonPage());
+        assertThat(modelDate.name).isEqualTo("webmagic");
+    }
+
+    @Test
+    public void testExtractByUrl() throws Exception {
+        ModelUrl modelDate = (ModelUrl) PageModelExtractor.create(ModelUrl.class).process(pageMocker.getMockJsonPage());
+        assertThat(modelDate.name).isEqualTo("webmagic");
+    }
 }