JSONObject 到 Java bean 类不起作用答案

【问题标题】：JSONObject to Java bean class not workingJSONObject 到 Java bean 类不起作用
【发布时间】：2017-08-07 14:10:56
【问题描述】：

我在jersy client 中编写了一个 Web 服务并将一个 json 字符串转换为 bean 类，但日期显示错误。我试过@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")但它仍然在方法中给出了同样的错误。如何在我的代码中将字符串转换为日期格式。

错误：

not a valid representation (error: Failed to parse Date value 'Aug 7, 2017 1:35:00 PM': Can not parse date "Aug 7, 2017 1:35:00 PM": not compatible with any of standard forms ("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd"))

网络服务

    @POST
    @Path("/driverLocation")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Response handleDriverLocation(String jsonRequest) {
        List<DriverLocationDetails> driverLocationDetails = bookingService
                .getLocationDetailsFromDB();
        boolean save = false;
        for (DriverLocationDetails details : driverLocationDetails) {
            Gson g = new Gson();
            jsonRequest = g.toJson(details);
            DriverLocationDetails driverLocationDetail = TmsUtil
                    .readAsObjectOf(DriverLocationDetails.class, jsonRequest);
            save = bookingService.saveLocation(driverLocationDetail);
        }

        JSONObject jo = new JSONObject();
        try {
            if (save) {
                jo.put("Save", "saved");
            } else {
                jo.put("Save", "failed");
            }
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return Response.status(200).entity(jo.toString()).build();

    }

static com.fasterxml.jackson.databind.ObjectMapper MAPPER = new ObjectMapper();
public static <T> T readAsObjectOf(Class<T> clazz, String value) {
        try {
            return MAPPER.readValue(value, clazz);
        } catch (Exception e) {
            logger.error("{}, {}", e.getMessage(), e.fillInStackTrace());
        }
        return null;
    }

控制台

Can not construct instance of java.util.Date from String value 'Aug 7, 2017 1:35:00 PM': not a valid representation (error: Failed to parse Date value 'Aug 7, 2017 1:35:00 PM': Can not parse date "Aug 7, 2017 1:35:00 PM": not compatible with any of standard forms ("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd"))
 at [Source: java.io.StringReader@4d768e3c; line: 1, column: 72] (through reference chain: in.greenorange.model.DriverLocationDetails["gpsLocationTime"]), com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not construct instance of java.util.Date from String value 'Aug 7, 2017 1:35:00 PM': not a valid representation (error: Failed to parse Date value 'Aug 7, 2017 1:35:00 PM': Can not parse date "Aug 7, 2017 1:35:00 PM": not compatible with any of standard forms ("yyyy-MM-dd'T'HH:mm:ss.SSSZ", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "EEE, dd MMM yyyy HH:mm:ss zzz", "yyyy-MM-dd"))
 at [Source: java.io.StringReader@4d768e3c; line: 1, column: 72] (through reference chain: in.greenorange.model.DriverLocationDetails["gpsLocationTime"])

【问题讨论】：

但是您希望它如何工作？....这种模式 "yyyy-MM-dd HH:mm:ss" i不匹配 'Aug 7, 2017 1:35:00 PM' 输入

标签： java json rest web-services

【解决方案1】：

您的模式必须如下所示：

@JsonFormat(pattern = "MMM d',' yyyy HH:mm:ss a")

因为这是您从服务器获得的模式

【讨论】：

【解决方案2】：

我只是用 GSon 来转换，因为 jackson 有转换

DriverLocationDetails driverLocationDetail = g.fromJson(jsonRequest, DriverLocationDetails.class);

【讨论】：