How Do I Upload A File And JSON Data In Postman Using Java?

To upload a file and JSON data in Postman using Java, you can use the Apache HttpComponents library. Here is an example that demonstrates the process:

  1. Include the following dependency in your Maven or Gradle project:

    <!-- Maven -->
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.13</version>
    </dependency>
    
    // Gradle
    implementation 'org.apache.httpcomponents:httpclient:4.5.13'
    
  2. Use the below code snippet to upload a file and JSON data:

    import org.apache.http.HttpEntity;
    import org.apache.http.HttpResponse;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.entity.ContentType;
    import org.apache.http.entity.mime.MultipartEntityBuilder;
    import org.apache.http.entity.mime.content.FileBody;
    import org.apache.http.entity.mime.content.StringBody;
    import org.apache.http.impl.client.HttpClientBuilder;
    
    import java.io.File;
    import java.io.IOException;
    
    public class FileUploader {
        public static void main(String[] args) throws IOException {
            String url = "http://your-api-endpoint";
            String filePath = "path/to/your/file.txt";
            String jsonString = "{\"key\": \"value\"}";
    
            HttpClient httpClient = HttpClientBuilder.create().build();
            HttpPost httpPost = new HttpPost(url);
    
            // Create MultipartEntityBuilder
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    
            // Add JSON data
            builder.addPart("data", new StringBody(jsonString, ContentType.APPLICATION_JSON));
    
            // Add file
            File file = new File(filePath);
            FileBody fileBody = new FileBody(file);
            builder.addPart("file", fileBody);
    
            HttpEntity multipart = builder.build();
            httpPost.setEntity(multipart);
    
            HttpResponse response = httpClient.execute(httpPost);
    
            // Handle response
            int statusCode = response.getStatusLine().getStatusCode();
            System.out.println("Status code: " + statusCode);
    
            // Add further code to handle the response as per your requirements
        }
    }
    

Make sure you replace http://your-api-endpoint with the actual URL of the API endpoint you want to make the request to, and path/to/your/file.txt with the valid file path you want to upload.

This code snippet creates a POST request with a MultipartEntityBuilder to send both the file and the JSON data. The file is added as a FileBody while the JSON data is added as a StringBody. The complete HTTP request is then executed using the HttpClient provided by Apache HttpComponents.

About the Author Rex

I'm a passionate tech blogger with an insatiable love for programming! From my early days tinkering with code, I've delved into web dev, mobile apps, and AI. Sharing insights and tutorials with the world is my joy, connecting me to a global community of like-minded tech enthusiasts. Python holds a special place in my heart, but I embrace all challenges. Constantly learning, I attend tech conferences, contribute to open-source projects, and engage in code review sessions. My ultimate goal is to inspire the next generation of developers and contribute positively to the ever-evolving tech landscape. Let's code together!