To send a POST HTTP request to a URL and receive the response in XML format, you can use the `java.net.HttpURLConnection` class in Java. To handle the XML response and populate the POJO class with null values for missing elements, you can use JAXB for XML binding. Here's a code example:
Assuming you have a POJO class `ResponseData` that corresponds to the structure of the XML response:
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "response")
public class ResponseData {
private String name;
private String age;
// Add other fields as needed
// Getters and Setters
}
Now, here's the code to send a POST HTTP request, receive the XML response, and populate the `ResponseData` class with null values for missing elements:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
public class Main {
public static void main(String[] args) {
try {
// URL of the API endpoint
URL url = new URL("https://example.com/api/endpoint");
// Create a connection
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
// Set the request method to POST
connection.setRequestMethod("POST");
// Set other request headers, if required
connection.setRequestProperty("Content-Type", "application/xml");
connection.setRequestProperty("Authorization", "Bearer YOUR_ACCESS_TOKEN");
// Enable output and input for the connection
connection.setDoOutput(true);
connection.setDoInput(true);
// Create the request body as per your API requirements
String requestBody = "<request>YOUR_REQUEST_DATA</request>";
// Write the request body to the connection's output stream
try (OutputStream outputStream = connection.getOutputStream()) {
byte[] requestBodyBytes = requestBody.getBytes();
outputStream.write(requestBodyBytes, 0, requestBodyBytes.length);
}
// Get the response code
int responseCode = connection.getResponseCode();
// Read the response body (XML)
if (responseCode == HttpURLConnection.HTTP_OK) {
try (BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
StringBuilder response = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
// Parse the XML response and populate the ResponseData object
String xmlResponse = response.toString();
ResponseData responseData = parseXmlResponse(xmlResponse);
// Print the parsed data
System.out.println("Name: " + responseData.getName());
System.out.println("Age: " + responseData.getAge());
}
} else {
// Handle HTTP response code other than 200 OK
System.out.println("HTTP Error Code: " + responseCode);
}
// Close the connection
connection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
private static ResponseData parseXmlResponse(String xmlResponse) {
try {
JAXBContext jaxbContext = JAXBContext.newInstance(ResponseData.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
return (ResponseData) unmarshaller.unmarshal(new java.io.StringReader(xmlResponse));
} catch (JAXBException e) {
e.printStackTrace();
}
return null;
}
}
In this code, replace the URL with your desired API endpoint and modify the request body as per the API requirements. The response from the API will be in XML format, which will be parsed using JAXB, and the data will be populated into the `ResponseData` POJO class.
Make sure to include the required dependencies for JAXB in your `pom.xml` or build.gradle file. For example, in Maven:
<dependencies>
<!-- Other dependencies -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
</dependency>
</dependencies>
Also, ensure that your `ResponseData` class is annotated correctly for XML binding using JAXB annotations (`@XmlRootElement`, `@XmlElement`, etc.).
Please note that this code is a basic example and might need to be adjusted based on your specific use case and API requirements.
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