Java POST API RESTCALL

Java Program for calling POST API to send Multipart file.

Java code:

import java.net.URL;

import java.nio.channels.Channels;

import java.nio.channels.ReadableByteChannel;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.impl.client.HttpClientBuilder;

 // Test.pdf file to upload

File file = new File("Test.pdf");

HttpClient client = HttpClientBuilder.create().build();

HttpPost postRequest = new HttpPost(urlString);

// Adding header parameters

postRequest.addHeader("headerKey","headerValue");

//Creating multipart Entity

MultipartEntityBuilder multiPartEntity = MultipartEntityBuilder.create();

multiPartEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

// setting file inside filebody

FileBody fileBody = new FileBody(file);

// Prepare payload

multiPartEntity.addPart("fileKeyParameter", fileBody);

// Set to request body

postRequest.setEntity(multiPartEntity.build());

// Sending request

HttpResponse response;

response = client.execute(postRequest);

// reading response coming from API call

if (response != null) {

InputStream ips = response.getEntity().getContent();

BufferedReader buf = new BufferedReader(new InputStreamReader(ips, "UTF-8"));

if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {

return (response.getStatusLine().getReasonPhrase());

}

StringBuilder sb = new StringBuilder();

String s;

while (true) {

s = buf.readLine();

if (s == null || s.length() == 0)

break;

sb.append(s);

}

buf.close();

ips.close();

System.out.println(sb.toString());

}