在android中解码以utf-8格式编码的字符串 [英] decode string encoded in utf-8 format in android

问题描述

我有一个来自 xml 的字符串，它是德语文本.特定于德语的字符通过 UTF-8 格式进行编码.在显示字符串之前，我需要对其进行解码.

I have a string which comes via an xml , and it is text in German. The characters that are German specific are encoded via the UTF-8 format. Before display the string I need to decode it.

我尝试了以下方法:

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.我如何解码德语字符串

None of them are working. How do I decode the German string

先谢谢你.

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);
        }
    }
}

推荐答案

您可以使用带有 charset 参数的 String 构造函数:

You could use the String constructor with the charset parameter:

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，并且我假设它是 UTF-8 编码的，因此问题可能在于解析它.

Also, since you get the data from an xml document, and I assume it is encoded UTF-8, probably the problem is in parsing it.

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，则可以同时使用 InputStream 和 InputSource

You should use InputStream/InputSource instead of a XMLReader implementation, because it comes with the encoding. So if you're getting this data from a http response, you could either use both InputStream and 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

以下是完整的请求和响应处理示例:

Here is a sample of a complete request and response handling:

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

由于问题不在于编码，而在于将源 xml 转义为 html 实体，因此最好的解决方案是(除了更正 php 以不转义响应之外)，使用 apache.commons.lang 库 非常方便的静态 StringEscapeUtils 类.

As the problem is not the encoding but the source xml being escaped to html entities, the best solution is (besides correcting the php to do not escape the response), to use the apache.commons.lang library's very handy static StringEscapeUtils class.

导入库后，在您的 xml 处理程序的 characters 方法中输入以下内容:

After importing the library, in your xml handler's characters method you put the following:

@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

在您的最后一段代码中，问题在于 nodevalue 变量的初始化.应该是:

In your last code the problem is with the initialization of the nodevalue variable. It should be:

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

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