我有问题。我有String
String str="Привет";
我尝试通过POST请求发送到服务器。收到此字符串的网站有windows-1251字符集（在服务器上所有文件，数据，文本等都有windows-1251）。它显示了所有数据，除了从我的Java应用程序收到的俄语符号。我搜索了这个问题，如何在我的Java应用程序中更改字符串编码，但我仍然没有解决方案。
我试图这样做
String str=new String("Привет".getBytes("utf-8"),"cp1251");
但这没有帮助。
所以问题是：如何将Java utf-8字符串转换为cp1251，以便接受cp1251编码的Web服务器显示从我这里收到的所有数据。
这是我发送请求的方式：
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(" ", " ")/*.replaceAll("<!--[\\s\\S]*?-->", "")*/.replaceAll("[\r\n\t]","").replaceAll("\\s+", " "));
curRedirect=0;
return mp;
}
答案 0 :(得分：0)
字符串在Java中是UTF-16。字节在其他编码中。字节通过网络发送。字符串不是。当您向网络发送字节时，使用CharsetEncoder获取所需编码的字节，并通过网络发送。您还没有显示实际通过网络发送数据的代码，因此无法更精确。