Question

我遇到UTF-8字符编码问题。从mysql数据库通过服务器加载内容的我的android应用程序没有正确显示像（é，í，ü，ö，ä等）这样的特殊字符。

我尝试了以下内容：

我查看了我的数据库，看起来都不错。（utf8_unicode_ci）
我创建了一个简单的Java项目，使用我自己的数据库框架直接在我的数据库上工作。一切看起来都不错！
我创建了一个简单的Java项目，使用相同的代码（AsyncTask除外）通过我的服务器从数据库中请求数据。一切看起来都不错！
我查看了服务器日志文件，即发送的响应回到客户端看起来不错！
我看了一下传入的数据，字符串看起来很破！之后转换它，例如通过`new String（line.getBytes（），“utf-8”）'无效。

Number 5看起来很适合普通的java项目，但是我的Android应用程序遇到了麻烦。为此，我使用以下代码：

public class Sender extends AsyncTask<Object, String, Object> {

    private static final String LOG_CLASS = Sender.class.getSimpleName();

    private static final String host = "xxx";
    private static final String port = "8080";
    private static final String serverUrl = "http://" + host + ":" + port + "/WebService/HomeServlet";


    @Override
    protected Object doInBackground(Object ... request) {

        final HttpClient httpclient = new DefaultHttpClient();
        final HttpPost httppost = new HttpPost(serverUrl);

        final List<NameValuePair> params = new ArrayList<NameValuePair>(2);
        params.add(new BasicNameValuePair("SOAP", WsUtils.parseObjectToSoap(request[0])));

        try {
            httppost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();

            if (entity != null) {
                InputStream instream = entity.getContent();
                try {
                    Log.i(LOG_CLASS, "Calling Server: " + serverUrl);

                    InputStreamReader isr = new InputStreamReader(instream, "UTF-8");
                    BufferedReader reader = new BufferedReader(isr);

                    final StringBuilder soapMessage = new StringBuilder();

                    String line;
                    while ((line = reader.readLine()) != null) {
                        Log.i(LOG_CLASS, "xxxxxxxx: " + new String(line.getBytes(), "utf-8"));
                        soapMessage.append(line);
                    }

                    final String fullQualifiedClassName = WsUtils.identifySoapMessage(soapMessage.toString());
                    final Object parsedSoapCall = WsUtils.parseSoapToObject(fullQualifiedClassName, soapMessage.toString());

                    return parsedSoapCall;

                } finally {
                    instream.close();
                }
            }
        } catch (UnsupportedEncodingException e) {
            Log.e(LOG_CLASS, "Encoding is not supported: " + e.getStackTrace());
        } catch (ClientProtocolException e) {
            Log.e(LOG_CLASS, "ClientProtocolException: " + e.getStackTrace());
        } catch (IOException e) {
            Log.e(LOG_CLASS, "IOException: " + e.getStackTrace());
        }


        Log.e(LOG_CLASS, "Error while loading data from Server");
        return null;
    }

}

服务器的这一部分正在发送响应。日志消息显示没有编码问题。

public class HomeServlet extends HttpServlet {

    private static final long serialVersionUID = 7376640150158278177L;

    public static final Logger LOG = Logger.getLogger(HomeServlet.class);
    private Processing processing = new Processing();

        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

            final String soapMessage = req.getParameter("SOAP");

            /* do some work */

            /* Process request (Database processing etc.) */
            final String response = processing.process(parsedSoapCall);
            LOG.info("Incoming request processed, back to client: " + response);

            /* Sending response back to client */
            if (null != response) {
                final PrintWriter writer = resp.getWriter();
                writer.println(response);
            }

        }

    }

DataBase类的连接字符串：

con = DriverManager.getConnection("jdbc:mysql://" + dbHost + ":" + dbPort + "/" + dbName + "?user=" + dbUserName + "&password=" + dbPassword + "&useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&autoReconnect=true");

问题解决了：该问题是由Webserver标头中缺少编码引起的。我已将编码添加到标题中，现在它正常工作。 HttpServletResponse.setContentType（ “text / html的”）; HttpServletResponse.setCharacterEncoding（ “UTF-8”）;

谢谢，伙计们。

Answer 1

不要使用InputStream和InputStreamReader逐行从实体中获取String，请尝试使用：

String responseBody = EntityUtils.toString(entity);

它将正确地自动检测HTTP响应中使用的并在标头中指定的编码。

Answer 2

您可能需要更改

InputStreamReader isr = new InputStreamReader(instream);

到

InputStreamReader isr = new InputStreamReader(instream, "UTF-8");

虽然UTF-8已经是Android的默认字符集。

为什么UTF-8编码在简单的Java项目中工作而在Android中不工作？

2 个答案: