How do I upload attachment to JIRA Issue via REST API?

Loïc GRIVEAU

Is it possible to upload attachment in java using REST API without using cURL ?

Is it possible to upload a file using REST API BROWSER ?

Loïc GRIVEAU

Here my code for upload and download attachment :

public boolean addAttachmentToIssue(String issueKey, String fullfilename) throws IOException{

		CloseableHttpClient httpclient = HttpClients.createDefault();
		
		HttpPost httppost = new HttpPost(jira_attachment_baseURL+"/api/latest/issue/"+issueKey+"/attachments");
		httppost.setHeader("X-Atlassian-Token", "nocheck");
		httppost.setHeader("Authorization", "Basic "+jira_attachment_authentication);
		
		File fileToUpload = new File(fullfilename);
		FileBody fileBody = new FileBody(fileToUpload);
		
		HttpEntity entity = MultipartEntityBuilder.create()
				.addPart("file", fileBody)
				.build();
		
		httppost.setEntity(entity);
        String mess = "executing request " + httppost.getRequestLine();
        logger.info(mess);
        
        CloseableHttpResponse response;
		
        try {
			response = httpclient.execute(httppost);
		} finally {
			httpclient.close();
		}
        
		if(response.getStatusLine().getStatusCode() == 200)
			return true;
		else
			return false;

	}
	
	public boolean getAttachmentFromIssue(String contentURI, String fullfilename) throws IOException {
        
		CloseableHttpClient httpclient = HttpClients.createDefault();
        
        try {
            HttpGet httpget = new HttpGet(contentURI);
            httpget.setHeader("Authorization", "Basic "+jira_attachment_authentication);
                        
            System.out.println("executing request " + httpget.getURI());

            CloseableHttpResponse response = httpclient.execute(httpget);
            
            int status = response.getStatusLine().getStatusCode();
            if (status >=200 && status < 300) {
            	HttpEntity entity = response.getEntity();
            	if (entity.isStreaming()) {
            		byte data[] = EntityUtils.toByteArray(entity);
            		FileOutputStream fout = new FileOutputStream(new File(fullfilename));
            		fout.write(data);
            		fout.close();
            	}
            }
		} finally {
            httpclient.close();
        }
        
        return true;
	}

jira_attachment_authentication is define elsewhere as :

jira_attachment_authentication = new String(org.apache.commons.codec.binary.Base64.encodeBase64((user+":"+pass).getBytes()));