fix #1493

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

@@ -78,6 +78,7 @@ public abstract class JSON implements JSONStreamAware, JSONAware {
  static final SerializeFilter[] emptyFilters = new SerializeFilter[0];
 
  public static String DEFFAULT_DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
+ public static String DEFFAULT_LOCAL_DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS";
 
  public static int DEFAULT_PARSER_FEATURE;
  static {

src/main/java/com/alibaba/fastjson/parser/deserializer/Jdk8DateCodec.java

@@ -373,8 +373,10 @@ public void write(JSONSerializer serializer, Object object, Object fieldName, Ty
  }
  write(out, dateTime, format);
  } else {
- out.writeString(object.toString());
+ format = JSON.DEFFAULT_LOCAL_DATE_TIME_FORMAT;
+ write(out, dateTime, format);
  }
+
  } else {
  out.writeString(object.toString());
  }

src/test/java/com/alibaba/json/bvt/issue_1400/Issue1493.java

@@ -2,27 +2,45 @@
 
 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.serializer.SerializerFeature;
+import com.alibaba.json.bvt.issue_1500.Issue1500;
 import junit.framework.TestCase;
+import org.junit.Assert;
 
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 
 public class Issue1493 extends TestCase {
+
  public void test_for_issue() throws Exception {
+
  TestBean test = new TestBean();
+ String stime2 = "2017-09-22 15:08:56";
 
  LocalDateTime time1 = LocalDateTime.now();
- LocalDateTime time2 = LocalDateTime.parse("2017-09-22 15:08:56", DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
+ LocalDateTime time2 = LocalDateTime.parse(stime2, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
  test.setTime1(time1);
  test.setTime2(time2);
+ String t1 = time1.toString();
+
+ String json = JSON.toJSONString(test, SerializerFeature.WriteDateUseDateFormat);
+ Assert.assertEquals("{\"time1\":\""+t1+"\",\"time2\":\""+stime2+"\"}",json);
+
+
+ JSON.DEFFAULT_LOCAL_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
+ String stime1 = DateTimeFormatter.ofPattern(JSON.DEFFAULT_LOCAL_DATE_TIME_FORMAT).format(time1);
+
+ json = JSON.toJSONString(test, SerializerFeature.WriteDateUseDateFormat);
+ Assert.assertEquals("{\"time1\":\""+stime1+"\",\"time2\":\""+stime2+"\"}",json);
+
+
+ json = JSON.toJSONStringWithDateFormat(test, "yyyy-MM-dd HH:mm:ss", SerializerFeature.WriteDateUseDateFormat);
+ Assert.assertEquals("{\"time1\":\""+stime1+"\",\"time2\":\""+stime2+"\"}",json);
 
- String json = JSON.toJSONStringWithDateFormat(test, "yyyy-MM-dd HH:mm:ss", SerializerFeature.WriteDateUseDateFormat);
- System.out.println(json);
  }
 
  public static class TestBean {
- private LocalDateTime time1;
- private LocalDateTime time2;
+ LocalDateTime time1;
+ LocalDateTime time2;
 
  public LocalDateTime getTime1() {
  return time1;