update jsonpath to 2.2.0 #606

pom.xml

@@ -83,7 +83,7 @@
             <dependency>
                 <groupId>com.jayway.jsonpath</groupId>
                 <artifactId>json-path</artifactId>
-                <version>0.8.1</version>
+                <version>2.2.0</version>
             </dependency>
             <dependency>
                 <groupId>org.slf4j</groupId>

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

@@ -1,9 +1,11 @@
 package us.codecraft.webmagic.selector;
 
+import com.alibaba.fastjson.JSON;
 import com.jayway.jsonpath.JsonPath;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 /**
  * JsonPath selector.<br>
@@ -32,12 +34,20 @@ public class JsonPathSelector implements Selector {
         if (object instanceof List) {
             List list = (List) object;
             if (list != null && list.size() > 0) {
-                return list.iterator().next().toString();
+                return toString(list.iterator().next());
             }
         }
         return object.toString();
     }
 
+    private String toString(Object object) {
+        if (object instanceof Map) {
+            return JSON.toJSONString(object);
+        } else {
+            return String.valueOf(object);
+        }
+    }
+
     @Override
     public List<String> selectList(String text) {
         List<String> list = new ArrayList<String>();
@@ -48,10 +58,10 @@ public class JsonPathSelector implements Selector {
         if (object instanceof List) {
             List<Object> items = (List<Object>) object;
             for (Object item : items) {
-                list.add(String.valueOf(item));
+                list.add(toString(item));
             }
         } else {
-            list.add(String.valueOf(object));
+            list.add(toString(object));
         }
         return list;
     }

webmagic-core/src/test/java/us/codecraft/webmagic/selector/JsonPathSelectorTest.java

@@ -52,4 +52,5 @@ public class JsonPathSelectorTest {
         JSONObject object2=JSON.parseObject("{\"author\":\"Nigel Rees\",\"title\":\"Sayings of the Century\",\"category\":\"reference\",\"price\":8.95}");
         assertThat(object1).isEqualTo(object2);
     }
+
 }