springboot 日期转化报错

问题场景:

使用Springboot框架搭建服务,传日期参数json参数为2016-08-15 17:00:00这种格式,springboot中不能识别,将其转化为对象对应的日期属性。而是抛出异常信息,提示转换失败。

代码:

传参对应实体类

public class Demo {
    private String id;


    private Date date;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }
}

controller

 @RequestMapping("/demo")
    public String demo(@RequestBody Demo demo) {
        System.out.println(demo.getId());
        return "this is client1";
    }

ajax调用使用的postman

请求报错:

{
    "timestamp": "2018-09-17T14:01:00.278+0000",
    "status": 400,
    "error": "Bad Request",
    "message": "JSON parse error: Cannot deserialize value of type `java.util.Date` from String "2018-09-17 21:46:08": not a valid representation (error: Failed to parse Date value '2018-09-17 21:46:08': Cannot parse date "2018-09-17 21:46:08": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSSZ', parsing fails (leniency? null)); nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.util.Date` from String "2018-09-17 21:46:08": not a valid representation (error: Failed to parse Date value '2018-09-17 21:46:08': Cannot parse date "2018-09-17 21:46:08": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSSZ', parsing fails (leniency? null))
 at [Source: (PushbackInputStream); line: 3, column: 9] (through reference chain: com.hanggle.eurekaclient.Demo["date"])",
    "path": "/demo"
}

错误原因是日期转换失败,由于springboot默认采用jackson,而jackson只能识别以下几种日期格式:

"yyyy-MM-dd'T'HH:mm:ss.SSSZ""yyyy-MM-dd'T'HH:mm:ss.SSS'Z'""yyyy-MM-dd";

"EEE, dd MMM yyyy HH:mm:ss zzz";

long类型的时间戳(毫秒时间戳)

不能识别yyyy-MM-dd HH:mm:ss类似格式的数据,所以转换失败。 

解决办法有以下几种:

1. 采用long时间戳(毫秒时间戳!!!!)如:1537191968000 

2.在传参的对象上加上@JsonFormat注解并且指定时区(此方法治标不治本)

@JsonFormat(locale="zh", timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")

如果项目中使用json解析框架为fastjson框架,则可使用如下解决方法:
在实体字段上使用@JsonFormat注解格式化日期

@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd HH:mm:ss")

3、采用全局处理方式统一处理,推荐这个做法

重写springboot默认转换

 参考:https://blog.csdn.net/qq906627950/article/details/79503801

public class MyDateFormat extends DateFormat {

    private DateFormat dateFormat;

    private SimpleDateFormat format1 = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");

    public MyDateFormat(DateFormat dateFormat) {
        this.dateFormat = dateFormat;
    }

    @Override
    public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
        return dateFormat.format(date, toAppendTo, fieldPosition);
    }

    @Override
    public Date parse(String source, ParsePosition pos) {

        Date date = null;

        try {

            date = format1.parse(source, pos);
        } catch (Exception e) {

            date = dateFormat.parse(source, pos);
        }

        return date;
    }

    // 主要还是装饰这个方法
    @Override
    public Date parse(String source) throws ParseException {

        Date date = null;

        try {

            // 先按我的规则来
            date = format1.parse(source);
        } catch (Exception e) {

            // 不行,那就按原先的规则吧
            date = dateFormat.parse(source);
        }

        return date;
    }

    // 这里装饰clone方法的原因是因为clone方法在jackson中也有用到
    @Override
    public Object clone() {
        Object format = dateFormat.clone();
        return new MyDateFormat((DateFormat) format);
    }


}
@Configuration
public class WebConfig {

    @Autowired
    private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder;

    @Bean
    public MappingJackson2HttpMessageConverter MappingJsonpHttpMessageConverter() {

        ObjectMapper mapper = jackson2ObjectMapperBuilder.build();

        // ObjectMapper为了保障线程安全性,里面的配置类都是一个不可变的对象
        // 所以这里的setDateFormat的内部原理其实是创建了一个新的配置类
        DateFormat dateFormat = mapper.getDateFormat();
        mapper.setDateFormat(new MyDateFormat(dateFormat));

        MappingJackson2HttpMessageConverter mappingJsonpHttpMessageConverter = new MappingJackson2HttpMessageConverter(
                mapper);
        return mappingJsonpHttpMessageConverter;
    }

}

 参考资料:

https://blog.csdn.net/pp_fzp/article/details/79588374

https://blog.csdn.net/qq906627950/article/details/79503801

原文地址:https://www.cnblogs.com/oskyhg/p/9665627.html