Wie ändere ich die Zeichenfolgencodierung?

Question

Ich habe ein Problem. Ich habe einen String

String str="Привет"; 

, die ich versuche, zu einem Server über ein POST Anfrage zu senden. Die Website, die diese Zeichenfolge erhält, hat den windows-1251 Zeichensatz (auf dem Server alle Dateien, Daten, Text usw. haben Windows-1251) .Es zeigt alle seine Daten gut, außer von russischen Symbolen aus meiner Java-App. Ich habe dieses Problem gegooglet und wie kann ich die Zeichenkodierung in meiner Java App ändern, aber ich habe immer noch keine Lösung.

ich versucht, dieses

String str=new String("Привет".getBytes("utf-8"),"cp1251"); 

zu tun, aber das half nicht.

Die Frage ist also: Wie konvertiere ich Java utf-8 String in cp1251 so dass der Web-Server, der richtig cp1251 Codierung zeigt alle Daten, die von mir akzeptiert. Diese

ist, wie ich Anfrage senden:

protected Map<String, String> getFromUrl(String url, boolean post, Map<String,String> postParams, Map<String,String> files, boolean options, String fbt, String asFile){ 
    dataStream=null; 
    bodyStream=null; 
    url=url.replaceAll("(?iu)^(http(s?)[://]*)+", "http$2://").replaceAll("(\\+|\\s+)", "%20"); 
    if(url.matches("(?iu)^https://.*$"))return getFromUrlSSL(url,post,postParams,files,options,fbt,asFile); 
    else if(!url.matches("(?iu)^((http(s?))|ftp)://.*$"))url="http://"+url; 
    if(url.length()>2048)url=url.substring(0,2048); 
    System.out.println("/*Trying to connect to "+url+"*/"); 
    Map<String, String> mp = new HashMap<String, String>(); 
    String host = this.getHostName(url), content = "", UA = this.getUA(), cookie = this.getCookie(host, UA), referer = "http://"+host+"/"; 
    try{ 
     mp.put("User-Agent",UA); 
     mp.put("cookies",cookie); 
     URL U = new URL(url); 
     HttpURLConnection conn = (HttpURLConnection)U.openConnection(); 
     conn.setInstanceFollowRedirects(false); 
     conn.setRequestProperty("Host", host); 
     conn.setRequestProperty("User-Agent", UA); 
     conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); 
     conn.setRequestProperty("Accept-Language", "ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3"); 
     conn.setRequestProperty("Accept-Encoding", "gzip,deflate"); 
     conn.setRequestProperty("Accept-Charset", "utf-8;q=0.7,*;q=0.7"); 
     conn.setRequestProperty("Keep-Alive", "115"); 
     conn.setRequestProperty("Connection", "keep-alive"); 
     if(arp!=null)for(Map.Entry<String, String> entry : arp.entrySet())conn.setRequestProperty(entry.getKey(),entry.getValue()); 
     if(referer != null&&(arp==null||!arp.containsKey("Referer")))conn.setRequestProperty("Referer", referer); 
     if(cookie != null && !cookie.contentEquals(""))conn.setRequestProperty("Cookie", cookie); 
     if(post&&(postParams!=null&&postParams.size()>0||files!=null&&files.size()>0)){ 
      if(!options)conn.setRequestMethod("POST"); 
      else conn.setRequestMethod("OPTIONS"); 
      conn.setDoOutput(true); 
      OutputStream os; 
      BufferedWriter writer; 
      if(files!=null&&files.size()>0){ 
       String boundary = Long.toHexString(System.currentTimeMillis()); 
       conn.setRequestProperty("Content-Type","multipart/form-data; boundary="+boundary); 

       os=conn.getOutputStream(); 
       writer=new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));; 
       if(postParams!=null&&postParams.size()>0){ 
        Iterator it=postParams.entrySet().iterator(); 
        while(it.hasNext()){ 
         Map.Entry<String,String> pair=(Map.Entry<String, String>)it.next(); 
         writer.append("--" + boundary).append("\r\n"); 
         writer.append("Content-Disposition: form-data; name=\""+pair.getKey()+"\"").append("\r\n"); 
         writer.append("\r\n"); 
         writer.append(pair.getValue()).append("\r\n"); 
        } 
       } 

       Iterator fIt=files.entrySet().iterator(); 
       while(fIt.hasNext())try{ 
        Map.Entry<String, String> fPair=(Map.Entry<String, String>)fIt.next(); 
        String filename=fPair.getValue(); 
        System.out.println("/*"+filename+"*/"); 
        if(!filename.matches("(?iu)^[\\s\\S]*?Content-Disposition. form-data[\\s\\S]*$")){ 
         File file=null; 
         System.out.println("/*"+filename+"*/"); 
         String fe=filename.matches("(?iu)^.*?(\\.[a-z0-9]{1,5})$")?filename.replaceAll("(?iu)^.*?(\\.[a-z0-9]{1,5})$","$1"):".jpg"; 
         if(filename.matches("(?iu)^(http|ftp).*$")){ 
          getFileFromUrl(filename,System.getProperty("user.dir")+"\\curFile"+fe); 
          file = new File(System.getProperty("user.dir")+"\\curFile"+fe); 
         } 
         else file = new File(filename); 
         try{ 
          BufferedImage bimg = ImageIO.read(file); 
          int width = bimg.getWidth(); 
          int height = bimg.getHeight(); 
          if(width<150||height<150)file=null; 
          else if(width/height>3||height/width>3)file=null; 
          else if(width>1024||height>1024){ 
           float ii=width/height,w=ii>0?1024:height/width*1024,h=ii>0?width/height*1024:1024; 
           int type = bimg.getType() == 0? BufferedImage.TYPE_INT_ARGB : bimg.getType(); 
           BufferedImage img = resizeImage(bimg,type,(int)w,(int)h); 
           ImageIO.write(img, "jpg", file); 
           if(filename.matches("(?iu)^(http|ftp).*$"))file = new File(System.getProperty("user.dir")+"\\curFile"+fe); 
           else new File(filename); 
          } 
         } 
         catch(Exception e){ 
          Error.showError("Browser.getFromUrl() can't get data from url",e); 
          return new HashMap<String,String>(){{put("error","fileerror");}}; 
         } 
         if(file!=null){ 
          writer.append("--" + boundary).append("\r\n"); 
          writer.append("Content-Disposition: form-data; name=\""+fPair.getKey()+"\"; filename=\""+file.getName()+"\"").append("\r\n"); 
          writer.append("Content-Type: application/octet-stream").append("\r\n"); 
          writer.append("\r\n").flush(); 
          InputStream input = new FileInputStream(file); 
          //System.out.println(conn.getOutputStream()); 
          try{ 
           byte[] buffer = new byte[1024]; 
           for(int length = 0;(length = input.read(buffer))>0;)os.write(buffer, 0, length); 
           os.flush(); 
          } 
          finally{try{input.close();}catch (IOException logOrIgnore){}} 
          writer.append("\r\n").flush(); 
         } 
        } 
       } 
       catch(Exception e){ 
        Error.showError("Browser.getFromUrl() can't get data from url",e); 
        return new HashMap<String,String>(){{put("error","fileerror");}}; 
       } 
       writer.append("--" + boundary + "--").append("\r\n"); 
      } 
      else{ 
       String params=""; 
       Iterator it=postParams.entrySet().iterator(); 
       while(it.hasNext()){ 
        Map.Entry<String,String> pair=(Map.Entry<String, String>)it.next(); 
        //System.out.println(pair.getKey()+"="+pair.getValue()); 
        /*if(pair.getKey().trim().contentEquals("")&&arp.get("Content-Type")!=null&&arp.get("Content-Type").matches("(?iu)^[\\s\\S]*?application/json[\\s\\S]$"))params+=pair.getValue(); 
        else */ 
        params+=URLEncoder.encode(pair.getKey(),"UTF-8")+"="+URLEncoder.encode(pair.getValue(),"UTF-8")+"&"; 
       } 
       params=params.replaceAll("&+$",""); 
       if(fbt!=null)conn.setRequestProperty("Content-Type",fbt); 
       os=conn.getOutputStream(); 
       writer=new BufferedWriter(new OutputStreamWriter(os, "UTF-8")); 
       if(fbt!=null){ 
        writer.append("Content-Type: "+fbt).append("\r\n"); 
        writer.append("Content-Length: "+params.length()).append("\r\n").append("\r\n"); 
        if(fbt.matches("(?iu)^.*boundary=.*$")){ 
         String boundary=fbt.replaceAll("(?iu)^[\\s\\S]*?boundary=([^;]+)[\\s\\S]*$","$1"); 
         writer.append(boundary).append("\r\n"); 
         it=postParams.entrySet().iterator(); 
         //System.out.println(boundary);System.exit(1); 
         while(it.hasNext()){ 
          Map.Entry<String,String> pair=(Map.Entry<String, String>)it.next(); 
          writer.append("Content-Disposition: form-data; name=\""+pair.getKey()+"\"").append("\r\n\r\n"); 
          writer.append(pair.getValue()).append("\r\n"); 
          writer.append(boundary).append("\r\n"); 
         } 
        } 
        else writer.append(params.replaceAll("(^[=&\\s])|([\\s=&]$)","")); 
       } 
       else writer.write(params.replaceAll("(^[=&\\s])|([\\s=&]$)","")); 
      } 
      writer.flush(); 
      writer.close(); 
      os.close(); 
      //System.out.println(conn.getOutputStream()); 
      conn.setConnectTimeout(120000); 
      conn.setReadTimeout(120000); 
     } 
     else{ 
      conn.setConnectTimeout(7000); 
      conn.setReadTimeout(7000); 
     } 
     conn.connect(); 
     //System.out.println(mp.get("cookies")); 
     mp = processResponseHeaders(conn.getHeaderFields()); 
     //System.out.println(mp.get("cookies")); 
     if(mp.get("cookies")!=null && !mp.get("cookies").trim().contentEquals("") && !mp.get("cookies").contentEquals(cookie))this.setCookie(host, UA, cookie+"; "+mp.get("cookies")); 
     if((needRedirect!=null&&!needRedirect.contentEquals("")) && curRedirect<5){ 
      if(!needRedirect.matches("(?i)^(.{3,5}?://)[\\s\\S]*$"))needRedirect = needRedirect.replaceAll("^([^\\.]*?://)?[^/\\?\\=\\&]*([/\\?\\=\\&])", url.replaceAll("^((http[s]?|ftp)://([^/\\?\\=\\&]*))[\\s\\S]*$","$1")+"$2"); 
      return getFromUrl(needRedirect,false,null,null,false,null,asFile); 
     } 
     try{ 
      dataStream = conn.getErrorStream() != null ? conn.getErrorStream() : conn.getInputStream(); 
      bodyStream = mp.get("content-encoding")!=null && mp.get("content-encoding").equalsIgnoreCase("gzip") ? new BufferedInputStream(new GZIPInputStream(dataStream)) : new BufferedInputStream(dataStream); 
      if(asFile!=null&&!asFile.trim().contentEquals(""))this.getFileFromUrlWIS(bodyStream,asFile); 
      else content = parseByteData(readToByteBuffer(bodyStream, 1024 * 1024), getCharsetFromContentType(conn.getContentType())); 
     } 
     catch(Exception e){Error.showError("Browser.getFromUrl() can't get data from url",e);} 
     finally{ 
      if(bodyStream != null)bodyStream.close(); 
      if(dataStream != null)dataStream.close(); 
     } 
     conn.disconnect(); 
    } 
    catch(Exception e){Error.showError("Browser.getFromUrl() can't get data from url",e);} 
    mp.put("url", url); 
    mp.put("content", content.replaceAll("&nbsp;", " ")/*.replaceAll("<!--[\\s\\S]*?-->", "")*/.replaceAll("[\r\n\t]","").replaceAll("\\s+", " ")); 
    curRedirect=0; 
    return mp; 
} 

Answer 1

Strings sind in UTF-16 in Java. Bytes sind in anderen Kodierungen. Bytes werden über das Netzwerk gesendet. Saiten sind nicht. Wenn Sie Bytes an das Netzwerk senden, verwenden Sie einen CharsetEncoder, um die Bytes in der von Ihnen gewünschten Codierung zu erhalten, und senden Sie diese über das Netzwerk. Sie haben den Code, der tatsächlich Daten über das Netzwerk sendet, nicht angezeigt, so dass es nicht möglich ist, genauer zu sein.