bug fixed for public_field & getter diff type

src/main/java/com/alibaba/fastjson/util/FieldInfo.java

@@ -92,7 +92,7 @@ public FieldInfo(String name, //
 
         if (field != null) {
             int modifiers = field.getModifiers();
-            fieldAccess = method == null || (modifiers & Modifier.PUBLIC) != 0;
+            fieldAccess = method == null || ((modifiers & Modifier.PUBLIC) != 0 && method.getReturnType() == field.getType());
             fieldTransient = (modifiers & Modifier.TRANSIENT) != 0;
         } else {
             fieldAccess = false;

src/test/java/com/alibaba/json/bvt/bug/Bug_for_DiffType.java

@@ -0,0 +1,26 @@
+package com.alibaba.json.bvt.bug;
+
+import com.alibaba.fastjson.JSON;
+
+import junit.framework.TestCase;
+
+public class Bug_for_DiffType extends TestCase {
+    public void test_for_diff_type() throws Exception {
+        Model model = new Model();
+        model.setValue(1001);
+
+        JSON.toJSONString(model);
+    }
+
+    public static class Model {
+        public String value;
+
+        public long getValue() {
+            return Long.parseLong(value);
+        }
+
+        public void setValue(long value) {
+            this.value = Long.toString(value);
+        }
+    }
+}