在Android HTTP请求中发送utf-8编码的字符串

Question

我在我的android应用程序中发了一个HTTP帖子.值从我的应用程序发送到我的网络服务器.问题是,这些值不是我想要的UTF-8.我的网络服务器有UTF-8编码,所以我知道我的应用程序中有代码需要更改.请参阅下面的我的代码段:

private void sendPostRequest(String facebookId, String name, String email) {

        class SendPostReqAsyncTask extends AsyncTask<String, Void, String>{

            @Override
            protected String doInBackground(String... bcs) {

                String bcFacebookId = bcs[0];
                String bcName = bcs[1];
                String bcEmail = bcs[2];



                HttpClient httpClient = new DefaultHttpClient();

                HttpPost httpPost = new HttpPost("URL");

                BasicNameValuePair facebookIdBasicNameValuePair = new BasicNameValuePair("bcFacebookId", bcFacebookId);
                BasicNameValuePair nameBasicNameValuePair = new BasicNameValuePair("bcName", bcName);
                BasicNameValuePair emailBasicNameValiePair = new BasicNameValuePair("bcEmail", bcEmail);

                List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
                nameValuePairList.add(facebookIdBasicNameValuePair);
                nameValuePairList.add(nameBasicNameValuePair);
                nameValuePairList.add(emailBasicNameValiePair);
                try {

                    UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList);

                    httpPost.setEntity(urlEncodedFormEntity);

                    try {
                        HttpResponse httpResponse = httpClient.execute(httpPost);

                        InputStream inputStream = httpResponse.getEntity().getContent();

                        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);

                        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                        StringBuilder stringBuilder = new StringBuilder();

                        String bufferedStrChunk = null;

                        while((bufferedStrChunk = bufferedReader.readLine()) != null){
                            stringBuilder.append(bufferedStrChunk);
                        }

                        return stringBuilder.toString();

                    } catch (ClientProtocolException cpe) {

                        cpe.printStackTrace();
                    } catch (IOException ioe) {
                        System.out.println("Second Exception caz of HttpResponse :" + ioe);
                        ioe.printStackTrace();
                    }

                } catch (UnsupportedEncodingException uee) {
                    System.out.println("An Exception given because of UrlEncodedFormEntity argument :" + uee);
                    uee.printStackTrace();
                }

                return null;
            }

例如,字母'ö'变为'？'.我该如何解决？干杯!

Answer 1

将字符转换为问号的最大原因是将字符转换为字节,然后再转换为字符,而不是匹配.

您提供的代码包含以下内容:

InputStreamReader inputStreamReader = new InputStreamReader(inputStream);

这是有问题的,因为您没有指定如何将字节转换为字符.相反,你可能想要这个:

InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");

您为字符编码指定的内容取决于您在其他地方指定的字符编码.如果不指定字符编码,您将获得"默认"字符编码,这取决于客户端和服务器中的设置.Java使用Unicode,UTF-8是唯一可以保留Java允许的所有字符的编码.

对于调试,您可能希望使用InputStream并从中检索字节,并打印出字节值,以验证它们确实是原始字符值的UTF-8编码表示.'ö'(x00F6)的正确编码是'Ã'(x00C3 x00B6).

您还需要确保原始POST请求是正确的UTF-8编码.UrlEncodedFormEntity类也使用默认字符编码,该编码可能不是UTF-8.改变这个:

UrlEncodedFormEntity uefe = new UrlEncodedFormEntity(nameValuePairList);

至

UrlEncodedFormEntity uefe = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");