将 DOM 元素编码从 CP1251 转换为 UTF-8

Question

我有一个简单的服务器端代码，它接受请求 xml 并将其作为字符串插入到 Oracle 数据库 Clob 列中。 问题是客户端发送带有 CP1251 编码文本的请求 xml，但我需要将它插入到带有 UTF-8 编码的 Oracle 中。 现在我用于 CP1251 的代码是：

        Element soapinElement = (Element) streams.getSoapin().getValue().getAny();  //retrieve request xml      
        Node node = (Node) soapinElement;
        Document document = node.getOwnerDocument();
        DOMImplementationLS domImplLS = (DOMImplementationLS) document.getImplementation();         
        LSSerializer serializer = domImplLS.createLSSerializer();
        LSOutput output = domImplLS.createLSOutput();
        output.setEncoding("CP1251");
        Writer stringWriter = new StringWriter();
        output.setCharacterStream(stringWriter);
        serializer.write(document, output);
        String soapinString = stringWriter.toString();

此代码识别以 CP1251 编码的文本。 任务是使用以 UTF-8 编码的相同但可读的文本。 请提出任何想法。

我试过这个，但它产生了不可读的字符而不是西里尔文：

        Element soapinElement = (Element)   streams.getSoapin().getValue().getAny();            
        Node node = (Node) soapinElement;
        Document document = node.getOwnerDocument();
        DOMImplementationLS domImplLS = (DOMImplementationLS) document.getImplementation();         
        LSSerializer serializer = domImplLS.createLSSerializer();
        LSOutput output = domImplLS.createLSOutput();
        output.setEncoding("CP1251");
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        output.setByteStream(byteArrayOutputStream);
        serializer.write(document, output);
        byte[] result = byteArrayOutputStream.toByteArray();
        InputStream is = new ByteArrayInputStream(result);
        Reader reader = new InputStreamReader(is, "CP1251");
        OutputStream out = new ByteArrayOutputStream();
        Writer writer = new OutputStreamWriter(out, "UTF-8");
        char[] buffer = new char[10];
        int read;
        while ((read = reader.read(buffer)) != -1) {
            writer.write(buffer, 0, read);
        }           
        reader.close();
        writer.close();
        String soapinString = out.toString();

Answer 1

您可以像下面这样解码 CP1251 字符集数据

Charset utf8charset = Charset.forName("UTF-8");
Charset cp1251charset = Charset.forName("CP1251");

// decode CP1251
        CharBuffer data = cp1251charset.decode(ByteBuffer.wrap(result));

并编码为 UTF-8 字符集

// encode UTF-8
        ByteBuffer outputBuffer = utf8charset.encode(data);

并将 ByteBuffer 转换为 byte[]

// UTF-8 Value        
        byte[] outputData = outputBuffer.array();

这应该可以解决您的问题。