implement Closeable & add testcase

Author: wenshao

src/main/java/com/alibaba/fastjson/JSONValidator.java

@@ -1,10 +1,11 @@
 package com.alibaba.fastjson;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Reader;
 
-public abstract class JSONValidator implements Cloneable {
+public abstract class JSONValidator implements Cloneable, Closeable {
     public enum Type {
         Object, Array, Value
     }

src/test/java/com/alibaba/json/bvt/validate/JSONValidatorTest.java

@@ -6,6 +6,7 @@
 import org.junit.Test;
 
 import java.io.ByteArrayInputStream;
+import java.io.StringReader;
 
 import static org.junit.Assert.*;
 
@@ -100,4 +101,14 @@ public void test_validate() throws Exception {
         JSONValidator validator = JSONValidator.from(json);
         assertTrue(validator.validate());
     }
+
+    @Test
+    public void test_validate_reader() throws Exception {
+        JSONValidator validator = JSONValidator.from(
+                new StringReader(
+                        new String(
+                                JSON.toJSONBytes(EishayDecodeBytes.instance.getContent()))));
+        assertTrue(validator.validate());
+        validator.close();
+    }
 }