fastjson 将字符串转Java对象 日期序列化异常 日期格式报错解决

Posted 2023-02-19 抓手

异常信息 

com.alibaba.fastjson.JSONException: For input string: "2022-12"
	at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:693)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:395)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:299)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:572)
	at com.bzcst.bop.oms.strategy.TestDTO.main(TestDTO.java:48)
Caused by: java.lang.NumberFormatException: For input string: "2022-12"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Long.parseLong(Long.java:589)
	at java.lang.Long.parseLong(Long.java:631)
	at com.alibaba.fastjson.serializer.DateCodec.cast(DateCodec.java:335)
	at com.alibaba.fastjson.parser.deserializer.AbstractDateDeserializer.deserialze(AbstractDateDeserializer.java:184)
	at com.alibaba.fastjson.parser.deserializer.AbstractDateDeserializer.deserialze(AbstractDateDeserializer.java:16)
	at com.alibaba.fastjson.parser.deserializer.DefaultFieldDeserializer.parseField(DefaultFieldDeserializer.java:86)
	at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.parseField(JavaBeanDeserializer.java:1277)
	at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:892)
	at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.parseRest(JavaBeanDeserializer.java:1610)
	at com.alibaba.fastjson.parser.deserializer.FastjsonASMDeserializer_1_TestDTO.deserialze(Unknown Source)
	at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:296)
	at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:688)
	... 4 more

json字符串为

String jsonString = "\\"testMonth\\":\\"2022-12\\",\\"testDate\\":\\"2022-10-23\\",\\"testDateTime\\":\\"2022-10-23 23:32:33\\"";

需要转为Java对象

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TestDTO 
    private Date testMonth;
    private Date testDate;
    private Date testDateTime;

    public static void main(String[] args) 
        String jsonString = "\\"testMonth\\":\\"2022-12\\",\\"testDate\\":\\"2022-10-23\\",\\"testDateTime\\":\\"2022-10-18 19:20:21\\"";

        TestDTO testDTO = JSONObject.parseObject(jsonString, TestDTO.class);
        System.out.println(testDTO);
    

其中testMonth 2022-12 就会报错。

查看Debugger

发现源码实际上是通过DefaultJSONParser里面的dateFormatPattern实现序列号格式的。

最终也是通过DefaultJSONParser完成反序列化的。

 

那么可以直接对dateFormatPattern设置值

DefaultJSONParser parser = new DefaultJSONParser(jsonString);
parser.setDateFormat("yyyy-MM");

 测试

    public static void main(String[] args) 
        String jsonString = "\\"testMonth\\":\\"2022-12\\",\\"testDate\\":\\"2022-10-23\\",\\"testDateTime\\":\\"2022-10-18 19:20:21\\"";

        DefaultJSONParser parser = new DefaultJSONParser(jsonString);
        parser.setDateFormat("yyyy-MM");
        TestDTO value = parser.parseObject(TestDTO.class);
        parser.close();
        System.out.println(value);


//        TestDTO testDTO = JSONObject.parseObject(jsonString, TestDTO.class);
//        System.out.println(testDTO);

    

结果正常输出

TestDTO(testMonth=Thu Dec 01 00:00:00 CST 2022, testDate=Sun Oct 23 00:00:00 CST 2022, testDateTime=Tue Oct 18 19:20:21 CST 2022)

重写toString后结果更清晰

TestDTO receivableMonth=2022-12-01 00:00:00, testDate=2022-10-23 00:00:00, testTime=2022-10-18 19:20:21