解码在android中以utf-8格式编码的字符串

Question

我有一个字符串,它来自xml,它是德语文本.特定于德语的字符通过UTF-8格式进行编码.在显示我需要解码它的字符串之前.

我尝试过以下方法:

try {
    BufferedReader in = new BufferedReader(
            new InputStreamReader(
                    new ByteArrayInputStream(nodevalue.getBytes()), "UTF8"));
    event.attributes.put("title", in.readLine());
} catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

我也试过这个:

try {
    event.attributes.put("title", URLDecoder.decode(nodevalue, "UTF-8"));
} catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

他们都没有工作.如何解码德语字符串

先感谢您.

UDPDATE:

@Override
public void characters(char[] ch, int start, int length)
        throws SAXException {
    // TODO Auto-generated method stub
    super.characters(ch, start, length);
    if (nodename != null) {
        String nodevalue = String.copyValueOf(ch, 0, length);
        if (nodename.equals("startdat")) {
            if (event.attributes.get("eventid").equals("187")) {
            }
        }
        if (nodename.equals("startscreen")) {
            imageaddress = nodevalue;
        }
        else {
            if (nodename.equals("title")) {
                // try {
                // BufferedReader in = new BufferedReader(
                // new InputStreamReader(
                // new ByteArrayInputStream(nodevalue.getBytes()), "UTF8"));
                // event.attributes.put("title", in.readLine());
                // } catch (UnsupportedEncodingException e) {
                // // TODO Auto-generated catch block
                // e.printStackTrace();
                // } catch (IOException e) {
                // // TODO Auto-generated catch block
                // e.printStackTrace();
                // }
                // try {
                // event.attributes.put("title",
                // URLDecoder.decode(nodevalue, "UTF-8"));
                // } catch (UnsupportedEncodingException e) {
                // // TODO Auto-generated catch block
                // e.printStackTrace();
                // }
                event.attributes.put("title", StringEscapeUtils
                        .unescapeHtml(new String(ch, start, length).trim()));
            } else
                event.attributes.put(nodename, nodevalue);
        }
    }
}

Answer 1

您可以将String构造函数与charset参数一起使用:

try
{
    final String s = new String(nodevalue.getBytes(), "UTF-8");
}
catch (UnsupportedEncodingException e)
{
    Log.e("utf8", "conversion", e);
}

此外,由于您从xml文档中获取数据,并且我认为它是UTF-8编码的,可能问题在于解析它.

您应该使用InputStream/ InputSource而不是XMLReader实现,因为它带有编码.因此,如果您从http响应中获取此数据,则可以使用InputStream和InputSource

try
{
    HttpEntity entity = response.getEntity();
    final InputStream in = entity.getContent();
    final SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
    final XmlHandler handler = new XmlHandler();
    Reader reader = new InputStreamReader(in, "UTF-8");
    InputSource is = new InputSource(reader);
    is.setEncoding("UTF-8");
    parser.parse(is, handler);
    //TODO: get the data from your handler
}
catch (final Exception e)
{
    Log.e("ParseError", "Error parsing xml", e);
}

或者只是InputStream:

try
{
    HttpEntity entity = response.getEntity();
    final InputStream in = entity.getContent();
    final SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
    final XmlHandler handler = new XmlHandler();
    parser.parse(in, handler);
    //TODO: get the data from your handler
}
catch (final Exception e)
{
    Log.e("ParseError", "Error parsing xml", e);
}

更新1

以下是完整请求和响应处理的示例:

try
{
    final DefaultHttpClient client = new DefaultHttpClient();
    final HttpPost httppost = new HttpPost("http://example.location.com/myxml");
    final HttpResponse response = client.execute(httppost);
    final HttpEntity entity = response.getEntity();

    final InputStream in = entity.getContent();
    final SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
    final XmlHandler handler = new XmlHandler();
    parser.parse(in, handler);
    //TODO: get the data from your handler
}
catch (final Exception e)
{
    Log.e("ParseError", "Error parsing xml", e);
}

更新2

由于问题不是编码而是源xml被转义为html实体,最好的解决方案是(除了纠正php不要逃避响应),使用apache.commons.lang库非常方便static StringEscapeUtils class.

导入库后,在xml处理程序的characters方法中输入以下内容:

@Override
public void characters(final char[] ch, final int start, final int length) 
    throws SAXException
{
    // This variable will hold the correct unescaped value
    final String elementValue = StringEscapeUtils.
        unescapeHtml(new String(ch, start, length).trim());
    [...]
}

更新3

在您的上一个代码中,问题在于nodevalue变量的初始化.它应该是:

String nodevalue = StringEscapeUtils.unescapeHtml(
    new String(ch, start, length).trim());