Java剪贴板：从Linux上粘贴HTML到Firefox

从Firefox上将HTML粘贴到Linux上的Java6应用程序（仅！）时，出现了一个奇怪的问题。这里是一个小例子：Java剪贴板：从Linux上粘贴HTML到Firefox

import java.awt.Toolkit; 
import java.awt.datatransfer.Clipboard; 
import java.awt.datatransfer.DataFlavor; 
import java.awt.datatransfer.Transferable; 
import java.io.Reader; 
import java.nio.ByteBuffer; 

class ClipboardPrinter { 
    public static void main(String args[]) throws Exception 
    { 
     Clipboard systemClipboard = Toolkit.getDefaultToolkit() 
       .getSystemClipboard(); 
     Transferable transferData = systemClipboard.getContents(null); 
     if (transferData == null) { 
      System.out.println("no content"); 
      return; 
     } 

//  final DataFlavor htmlFlavorString = new DataFlavor("text/html;class=java.lang.String"); 
//  String html = (String)transferData.getTransferData(htmlFlavorString); 
//  System.out.println("html = '" + html + "'"); 

     final DataFlavor htmlFlavor = new DataFlavor("text/html;class=java.nio.ByteBuffer;charset=US-ASCII"); 
     if (!transferData.isDataFlavorSupported(htmlFlavor)) { 
      System.out.println("no text/html reader content"); 
      return; 
     } 

     ByteBuffer bb = (ByteBuffer)transferData.getTransferData(htmlFlavor); 
     byte[] bytes = bb.array(); 
     for (byte b: bytes) 
     { 
      System.out.format("%02x", b); 
     } 
     System.out.println(); 
     final int cutoff = 2; 
     byte[] bytes2 = new byte[bytes.length - cutoff]; 
     for (int i = cutoff; i < bytes.length; i++) 
      bytes2[i-cutoff] = bytes[i]; 
     final String htmlContent = new String(bytes2, "UTF-16LE"); 


     System.out.println("htmlContent = '" + htmlContent + "'"); 
    } 
}

首先我试图使用new DataFlavor("text/html;class=java.lang.String")，（代码在上面的片段注释），但是这会导致在开始时不可用字符串用2个字符用值65533（和它不帮切断这两个字符）。

接下来我用字节缓冲区的数据风味charset=US-ASCII（我用的目的ASCII ！）：charset=UTF-16LE（或UTF-16或UTF-16BE）不会在所有工作。通过上面的charset=US-ASCII解决方案（以及new String(bytes2, "UTF-16LE")），7位字符可以工作（但例如，元音变音器不需要工作，取而代之的是打印'？'）。

我切断了两个字节，因为在开始时似乎有两个boms（当然不是，可能是别的东西）？

我得到与charset=UTF-8和截留值= 6（两个三字节的“替换字符” 0xEFBFBD在开始和变音符号编码为两个错误的字符）中的数据的风味类似的结果。在的情况下，我用new String(bytes2, "UTF-16LE")。

你有关于如何有任何建议：在这个解决方案

支持非ASCII字符（或找到一个更好的解决方案）？
确定它是UTF-16LE还是UTF-16BE？

谢谢！任何提示都表示赞赏！

BTW：这里是我的（Linux）的系统（从）所支持的数据口味：

[java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.Reader] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.lang.String] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.CharBuffer] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[C] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=application/x-java-serialized-object;representationclass=java.lang.String] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.Reader] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.lang.String] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.CharBuffer] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[C] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=unicode] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-8] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16BE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16LE] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=ISO-8859-1] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=US-ASCII] 
java.awt.datatransfer.DataFlavor[mimetype=text/x-moz-url-priv;representationclass=java.io.InputStream] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlinfo;representationclass=java.io.InputStream] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlcontext;representationclass=java.io.InputStream] 
java.awt.datatransfer.DataFlavor[mimetype=text/x-moz-url-priv;representationclass=java.nio.ByteBuffer] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlinfo;representationclass=java.nio.ByteBuffer] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlcontext;representationclass=java.nio.ByteBuffer] 
java.awt.datatransfer.DataFlavor[mimetype=text/x-moz-url-priv;representationclass=[B] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlinfo;representationclass=[B] 
java.awt.datatransfer.DataFlavor[mimetype=text/_moz_htmlcontext;representationclass=[B]]

来源

2013-02-10 Felix Natter

的可能重复的[爪哇拖动并经由的DropTargetListener删除文本]（http://stackoverflow.com/questions/7305628/java-drag-and-drop-text -via-droptargetlistener） – 2014-10-06 22:20:29

Java 6 is not supported any more.所以，问题已经过时了。

来源

2015-05-18 02:20:22 Alex

问题仍然存在于Java7中。在Java8中，情况更糟：当你从Firefox粘贴HTML时，垃圾就会产生（而不是像Java7那样的纯文本）。 – 2015-09-13 15:28:41

我相信这个问题是由于他的事实，他read from clipboard as US-ASCII，然后转换为Unicode，并期望离开德国变音完好。由于US-ASCII是一个7位字符集，德文变音符号不包括在内，并且在将剪贴板作为US-ASCII读取后已经丢失。

public class CharsetDemo { 
    public static void main(String[] args) throws Exception { 
     byte[] bytes; 

     // convert the German umlaut to bytes in US-ASCII charset 
     bytes = "ö".getBytes("US-ASCII"); 
     System.out.println("US-ASCII"); 
     System.out.println("bytes : " + asHexString(bytes)); 
     System.out.println("string: " + new String(bytes, "US-ASCII")); 
     System.out.println(); 

     // create a unicode string from the US-ASCII bytes 
     String utf8String = new String(bytes, "UTF-8"); 
     bytes = utf8String.getBytes("UTF-8"); 
     System.out.println("UTF-8"); 
     System.out.println("bytes : " + asHexString(bytes)); 
     System.out.println("string: " + utf8String); 
     System.out.println(); 

     // convert the German umlaut to bytes in ISO-8859-1 charset 
     bytes = "ö".getBytes("ISO-8859-1"); 
     System.out.println("ISO 8859-1"); 
     System.out.println("bytes : " + asHexString(bytes)); 
     System.out.println("string: " + new String(bytes, "ISO-8859-1")); 
     System.out.println(); 

     // create a unicode string from the ISO-8859-1 bytes 
     utf8String = new String(bytes, "UTF-8"); 
     bytes = utf8String.getBytes("UTF-8"); 
     System.out.println("UTF-8"); 
     System.out.println("bytes : " + asHexString(bytes)); 
     System.out.println("string: " + utf8String); 
     System.out.println(); 

     // bytes of the "REPLACEMET CHARACTER" 
     System.out.println("replacement character bytes: " 
      + asHexString("\uFFFD".getBytes("UTF-8"))); 

    } 

    static String asHexString(byte[] bytes) { 
     StringBuilder sb = new StringBuilder(); 
     for (byte b : bytes) { 
      sb.append(String.format("%X ", b)); 
     } 
     return sb.toString(); 
    } 
}

输出

US-ASCII 
bytes : 3F 
string: ? <--- the question mark represents here the "REPLACEMENT CHARACTER" 

UTF-8 
bytes : 3F 
string: ? 

ISO 8859-1 
bytes : F6 
string: ö 

UTF-8 
bytes : EF BF BD <-- the "REPLACEMENT CHARACTER", as "F6" is not a valid UTF-8 codepoint 
string: � 

replacement character bytes: EF BF BD

来源

2015-05-18 06:49:04 SubOptimal

感谢您的回复。我同意在允许8bit 字符时请求ASCII码没有意义。但是，这并不能解决上面的剪贴板问题。 – 2015-09-13 16:20:08

Java剪贴板：从Linux上粘贴HTML到Firefox

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