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cghersi
cghersi
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Cristiano Ghersi
Great passion for Software Engineering, mostly coding in Java and C#, I enjoy creating modular and reusable code for everybody!
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Nov 10, 2017
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Recent Snippets See all snippets by cghersi

public by cghersi created Jan 10, 2017  2070  10  5  3

How to write bytes into file in Java

Efficient way to write strings or bytes onto a file.
  import java.nio.file.Files;
  import java.nio.file.Paths;

  public static void writeFile(String path, String content) throws Exception {
		if (isNullOrEmpty(path) || isNullOrEmpty(content)) {
			return;
		}
		Files.write(Paths.get(path), content.getBytes());
	}                     
;

public by cghersi created Jan 10, 2017  2286  2  5  0

Read file in Java

Efficient way to read file in Java using Files class
  import java.nio.file.Files; 
  import java.nio.file.Paths;

  public static String readFile(String path) throws Exception {
		if (isNullOrEmpty(path)) {
			return "";
		}
		return new String(Files.readAllBytes(Paths.get(path)));
	}      
;

public by cghersi created Nov 4, 2012  289541  1  8  0

How to read a file into a string in Java

This simple snippet reads a file and put the content into a returned string
private static String readFileAsString(String filePath) throws java.io.IOException{

	StringBuffer fileData = new StringBuffer(1000);
	BufferedReader reader = new BufferedReader(new FileReader(filePath));
	char[] buf = new char[1024];
	int numRead=0;
	while((numRead=reader.read(buf)) != -1){
		String readData = String.valueOf(buf, 0, numRead);
		fileData.append(readData);
		buf = new char[1024];
	}

	reader.close();
	return fileData.toString();
}            
;

public by cghersi created Dec 16, 2016  2001  5  6  0

How to post an HTTP Request

just consume a RESTful API via POST request
public String sendPostReq(String url, String data, boolean addAccessToken) {
		// Create a new client:
		DefaultHttpClient httpClient = createHttpClient(url.startsWith("https"));
		HttpPost httppost = new HttpPost(url);
		httppost.setHeader("Content-Type", "application/x-www-form-urlencoded");
		httppost.setHeader("Charset", "UTF-8");
		httppost.setHeader("Accept", m_requestFormat.getMimeType());
		httppost.setHeader(S2C_HEADER, S2C_HEADER_VALUE);

		//access the secured service with the authorization cookie
		if (addAccessToken && !Utils.isNullOrEmpty(m_accessToken)) {
			addAccessTokenToCookies();
		}
		httpClient.setCookieStore(m_cookies);
		try {
			httppost.setEntity(new StringEntity(data, "UTF-8"));
		} catch (UnsupportedEncodingException e1) {
			log.error("Cannot encode data: " + data + " due to " + e1);
			return "";
		}

		HttpResponse response = null;
		String res = "";
		try {
			response = httpClient.execute(httppost);
			res = readStreamData(response.getEntity().getContent());
			log.info("Response:" + res);
		} catch (org.apache.http.conn.HttpHostConnectException e) {
			log.error("Cannot receive response due to " + e);
			if (url.contains(LOGIN_URL))
				res = TIMEOUT_RESP;
		} catch (IOException e) {
			log.error("Cannot parse incoming response due to " + e);
		} finally {
			httpClient.getConnectionManager().shutdown();
		}
		
		m_cookies = httpClient.getCookieStore(); //save cookies for the next secured run		
		return res;
	}
;

public by cghersi created Oct 5, 2016  8315  1  5  0

Preprovision a device via API with PLAT.ONE

This is a way to use the PLAT.ONE API to create a device with a full structure: once the device is then active, it will be automatically integrated into the PLAT.ONE environment.
// define the addressing information of the device:
int netId = 1;			
String deviceAddress = "100100";
WSNNodeType nodeType = WSNNodeType.ENDPOINT;
	
// add sensor breakdown:
List<LogNodeConfig> logNodeConfigs = new ArrayList<LogNodeConfig>();
List<ObjectId> objsTemp = new ArrayList<ObjectId>();
ObjectId objectIdTemp = frameParser.getObjID(0, 10);	// ObjectIdLow==0, ObjectIdHigh==10 = Temperature
objsTemp.add(objectIdTemp);
LogNodeConfig myNodeConf1 = frameParser.getLogNodeCfg(0, objsTemp, true);
Tsap tsapTemp = frameParser.getTsap("AA:11:22:33:4E");
myNodeConf1.setTsap(tsapTemp);
logNodeConfigs.add(myNodeConf1);
	
// invoke the API
ACSIresponseTicket<NodeIdentifier> ticket = null;
try {
	ticket = apiManager.ACSI_addNode(netId, nodeAddress, logNodeConfigs, nodeType, null);
} catch (Exception e1) {
	log.error("Could not create node ID= " + nodeAddress + ". "+ e1.getMessage());
	return null;
}

log.trace("Ticket: " +  ticket.getRequestReturnCode());
if (ticket.getRequestReturnCode() != ACSIreturnCodes.SUCCESS)
	return null;

nodeID = ticket.getResponse();
if (nodeID!=null) {
	log.info("Creating node: " + nodeID);
} else {
	log.error("CreateNode returned null NodeIdentifier");
	return null;
}          
;