来自JSON Post请求的JSON Post响应

Question

我已经创建了一个REST GET服务，它为我提供“GET JSON响应”，如下所示：

 {
        "payload": {
            "RFID": "E2005180040F003122202E5F",
            "chassisNumber": "4654689761",
            "vehicleNumber": "TN 01 1991"
        },
        "success": "true"
    }

现在我希望从下面的Post Request中获得Post Response：

Vehicle tag Request
{
  "vehicle_no": "TN07B0054"
 }

我已经创建了post方法，但它将整个事件作为参数。

如何仅从vehicle标签请求将Vehicle参数作为"TN07B0054“。

以下是我发出上述车辆标签请求时的POST响应：

{
    "payload": {
        "vehicleNumber": "\"vehicle_no\": \"TN 07 B 0054\""
    },
    "success": "false"
}

Answer 1

您可以创建一个名为VehicleTagRequest的实体

public class VehicleTagRequest {
    private String vehicle_no;

    public String getVehicle_no() {
        return vehicle_no;
    }

    public void setVehicle_no(String vehicle_no) {
        this.vehicle_no = vehicle_no;
    }
}

将字符串反序列化为上述java对象的最简单方法是使用Jackson library (https://github.com/FasterXML/jackson)

如果您正在管理依赖项，则可以在pom.xml中添加依赖项，如下所示(如果您在本地维护依赖项，则不需要执行此步骤)

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0.pr4</version>
        </dependency>

现在对您的车辆标签请求json进行反序列化。

使用Jackson的反序列化是使用ObjectMapper API完成的，如果你不使用注释，我已经做了一个示例代码片段，附在下面-

public class VehicleSerialisation {

    public static void main(String[] args) {
        String vehicle = "{\"vehicle_no\": \"TN07B0054\"}";

        ObjectMapper objectMapper = new ObjectMapper();
        VehicleTagRequest vehicleTagRequest = null;
        try {
            vehicleTagRequest = objectMapper.readValue(vehicle, VehicleTagRequest.class);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.print(vehicleTagRequest.getVehicle_no());
    }
}

然后，您可以使用vehicleTagRequest.getVehicle_no()来形成GET JSON Response请求

Answer 2

这是无效的Json

{
    "payload": {
        "vehicleNumber": "\"vehicle_no\": \"TN 07 B 0054\""
    },
    "success": "false"
}

不带转义字符

{
    "payload": {
        "vehicleNumber": "vehicle_no": "TN 07 B 0054"
    },
    "success": "false"
}

您可以像这样使用

{
        "payload": {
            "vehicleNumber": {
          "vehicle_no": "TN 07 B 0054"
              }
        },
        "success": "false"
    }

你的POJO应该是这样的

public class MyPojo
{
    private Payload payload;

    private String success;

    public Payload getPayload ()
    {
        return payload;
    }

    public void setPayload (Payload payload)
    {
        this.payload = payload;
    }

    public String getSuccess ()
    {
        return success;
    }

    public void setSuccess (String success)
    {
        this.success = success;
    }

    @Override
    public String toString()
    {
        return "ClassPojo [payload = "+payload+", success = "+success+"]";
    }
}