CODEWITHSUNDEEP
javaservletspostencodingutf-8
Gero
Gero

Reputation: 13553

How to guarantee a java POST request string / text to be UTF-8 encoding

I have a textmessage/string with letters like ä,ü,ß. I want everything to be UTF-8 encoded. When I write to a file or print the string to console, everything is fine. But when I want to send the same string to a web service, I get instead of ä,ü,ß the following �
I read the file from a Servlet. Do I really have to use the following 2 lines to get a UTF-8 encoded text?

byte [] bray = text.getBytes("UTF-8");
                text = new String(bray);

.

public static String readAsStream_UTF8(String filePathName){
        String text ="";
        InputStream input = Thread.currentThread().getContextClassLoader().getResourceAsStream("resources/"+filePathName);
        if(input == null){          
            System.out.println("Inputstream null.");            
        }else{          
            InputStreamReader isr = null;
            try {               
                isr = new InputStreamReader((InputStream)input, "UTF-8");
                BufferedReader reader = new BufferedReader(isr);
                StringBuilder sb = new StringBuilder();
                String sCurrentLine;
                while ((sCurrentLine = reader.readLine()) != null) {
                    sb.append(sCurrentLine);                                
                }       
                text= sb.toString();        

                //it works only if I use the following 2 lines
                byte [] bray = text.getBytes("UTF-8");
                text = new String(bray);

            } catch (Exception e1) { 
                e1.printStackTrace();
            }           
        }               
        return text;
    }

My sendPOST method looks something like the following:

String charset = "UTF-8";
OutputStreamWriter writer = null;
HttpURLConnection con = null;
String response_txt ="";
InputStream iss = null;

try {

    URL url = new URL(urlService);
    con = (HttpURLConnection)url.openConnection();
    con.setDoOutput(true); //triggers POST
    con.setDoInput(true);
    con.setRequestMethod("POST");
    con.setRequestProperty("accept-charset", charset);
    //con.setRequestProperty("Content-Type", "application/soap+xml");
    con.setRequestProperty("Content-Type", "application/soap+xml;charset=UTF-8");


    writer = new OutputStreamWriter(con.getOutputStream());
    writer.write(msg); //send POST data string      
    writer.flush();
    writer.close();

What do I have to do to force the msg, that will be sent to the web service, to really be UTF-8 encoded.

Upvotes: 1

Views: 1167

Answers (1)

wero
wero

Reputation: 32980

If you know the encoding of the file which you want to send you don't need to convert it to an intermediary string. Simply copy its bytes to the output:

// inputstream to a UTF-8 encoded resource file
InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("resources/"+filePathName);

HttpURLConnection con = ...

// set contenttype and encoding
con.setRequestProperty("Content-Type", "application/soap+xml;charset=UTF-8");
// copy input to output
copy(in, con.getOutputStream());

using some copy function.

Additionally you could also set the Content-Length header to the size of the resource file.

Upvotes: 1

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