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Sending special characters using HttpURLConnection in Java

I have a web service and I want to invoke that with "application/x-www-form-urlencoded" content type. The request sometimes contains special characters such as + * - and .... The problem is that destination web service doesn't receive the request perfectly. It receives something like this: "////////////////w==" almost all characters are turned to / . What is the problem?
Here is my code:
URL url = new URL("a-web-service-url");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(httpURLConnection.getOutputStream(), "UTF-8");
outputStreamWriter.write("test=/-+*=!##$%^&*()_");
outputStreamWriter.flush();
InputStream inputStream = httpURLConnection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
StringBuilder stringBuilder;
String line;
for (stringBuilder = new StringBuilder(); (line = bufferedReader.readLine()) != null; stringBuilder = stringBuilder.append(line)) {
;
}
bufferedReader.close();
httpURLConnection.disconnect();
String response = stringBuilder.toString().trim();
The web service receives:
test=////////////////w==

Use URLEncoder to encode the string before sending.
URLEncoder.encode(message, "UTF-8" );
In this case it will be
outputStreamWriter.write(URLEncoder.encode("test=/-+*=!##$%^&*()_", "UTF-8" ));

Error with cURL and java String variable

I'm trying to use glot.io api to compile java code with curl.
I read a text file :
BufferedReader bufferedReader = new BufferedReader(new FileReader("input.txt"));
StringBuffer stringBuffer = new StringBuffer();
String line = bufferedReader.readLine();
while(line != null){
stringBuffer.append(line);
line = bufferedReader.readLine();
}
If I use no quotation marks, I have no problem when I request the url
URL obj = new URL(url);
HttpURLConnection conn = (HttpURLConnection) obj.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty ("Authorization", "Token myToken");
conn.setRequestProperty("Content-Type", "application/json");
String data = "{\"files\": [{\"name\": \"main.java\", \"content\": \"" + stringBuffer.toString() + "\"}]}";
OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream());
out.write(data);
out.close();
BufferedReader bf = new BufferedReader(new InputStreamReader(conn.getInputStream()));
System.out.println(bf.readLine());
But when I use String in my code, the web page return 400 error.
Can you help me ?

JAVA: empty JSON in code, filled JSON in browser

I'm trying to get a json object from the url:
http://www.alfanous.org/jos2?action=search&unit=aya&fuzzy=True&query=حم
However, when I run my code with that url, I got an empty json, and when I'm request the url from my browser, the josn is filled.
what is wrong with my code?
URL url = new URL("http://www.alfanous.org/jos2?action=search&unit=aya&fuzzy=True&query=حم");
URLConnection conn = url.openConnection();
InputStream is = conn.getInputStream();
Scanner scan = new Scanner(is);
while (scan.hasNextLine()) {
System.out.println(scan.nextLine());
}
And I tried also
// Create URL object
URL obj = new URL("http://www.alfanous.org/jos2?action=search&unit=aya&fuzzy=True&query=حم");
// Communicate with the URL by HTTP
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
// add request header
con.setRequestProperty("User-Agent", "Mozilla/5.0");
// Getting response data
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
System.out.println(response.toString());

The solution was to encode the url string before passing it to the URL constructor.
String urlstring = "http://www.alfanous.org/jos2?action=search&unit=aya&fuzzy=True&query=حم";
URLEncoder.encode(urlstring, "UTF-8");
URL url = new URL(urlstring);
Then continues with the previous code shown in the original post.
URLConnection conn = url.openConnection();
InputStream is = conn.getInputStream();
Scanner scan = new Scanner(is);
while (scan.hasNextLine()) {
System.out.println(scan.nextLine());
}
And the moral is.. I should encode the url before I use it!

Try to use BufferedReader like this:
URL url = new URL("http://www.alfanous.org/jos2?action=search&unit=aya&fuzzy=True&query=حم");
URLConnection conn = url.openConnection();
BufferedReader br =new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((thisLine = br.readLine()) != null) {
System.out.println(thisLine);
}

How to add header to HttpRequest of GET method in Java

I have to pass a token as part of validation for each GET request to access RESTful web service. Below is the code I'm using it to access REST api:
public static String httpGet(String urlStr, String[] paramName, String[] paramVal) throws Exception {
URL url = new URL(urlStr);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream out = conn.getOutputStream();
Writer writer = new OutputStreamWriter(out, "UTF-8");
for (int i = 0; i < paramName.length; i++) {
writer.write(paramName[i]);
writer.write("=");
writer.write(URLEncoder.encode(paramVal[i], "UTF-8"));
writer.write("&");
}
writer.close();
out.close();
if (conn.getResponseCode() != 200) {
System.out.println("Response code: "+conn.getResponseCode());
throw new IOException(conn.getResponseMessage());
}
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
conn.disconnect();
return sb.toString();
}
I can't see any such method to set Header conn.setHeader() provided for HttpsURLConnection. It should be something like X-Cookie: token={token}; please help me to find a way to set header.

You can use:
conn.addRequestProperty("X-Cookie", "token={token}");
or setRequestProperty() also works

You are already setting headers on your request in your code when you do the following:
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
I.e. if the service you are communicating with requires that you send your token in the "X-Cookie" header you can simply do the same for that header:
conn.setRequestProperty("X-Cookie", "token={token}");

Http get response utf-8

I have following code. When i get the response, it's characters are faulty. i want to get the response with "UTF-8". How and where can i write that in my code below?
Thanks
URL httpPost = new URL(url);
HttpsURLConnection connection = (HttpsURLConnection) httpPost.openConnection();
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.getOutputStream().write(params.getBytes(Charset.forName("UTF-8")));
connection.getOutputStream().flush();
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
try {
String responseFromServer = response.toString();
dealsResponse = Utils.mapper.readValue(responseFromServer, GetDealsResponse.class);
} finally {
in.close();
}

connection.setRequestProperty("Accept-Charset", "UTF-8");