从 UTF-8 到 ISO-8859-1 的 Java 编码到 XML 文件中
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Java encoding from UTF-8 to ISO-8859-1 into a XML file
提问by Cyril N.
I have been trying to convert a UTF-8 String to its relative in ISO-8859-1 for outputting it in an XML document, and no matter what I try, the output is always wrongly displayed.
我一直在尝试将 UTF-8 字符串转换为 ISO-8859-1 中的相对字符串，以将其输出到 XML 文档中，无论我尝试什么，输出总是错误地显示。
For simplifying the question, I created a code snippet with all the tests I did, and I copy/paste after that the generated document.
为了简化问题，我创建了一个代码片段，其中包含我所做的所有测试，然后复制/粘贴生成的文档。
You can also be sure I tried all the combination possible between new String(xxx.getBytes("UTF-8"), "ISO-8859-1"), by switching UTF & ISO, and sometimes also by setting the same value. Nothing works !
您也可以确定我尝试了 new 之间的所有可能组合String(xxx.getBytes("UTF-8"), "ISO-8859-1")，通过切换 UTF 和 ISO，有时还通过设置相同的值。什么都行不通！
Here's the snippet :
这是片段：
// @see http://stackoverflow.com/questions/229015/encoding-conversion-in-java
private static String changeEncoding(String input) throws Exception {
// Create the encoder and decoder for ISO-8859-1
Charset charset = Charset.forName("ISO-8859-1");
CharsetDecoder decoder = charset.newDecoder();
CharsetEncoder encoder = charset.newEncoder();
// Convert a string to ISO-LATIN-1 bytes in a ByteBuffer
// The new ByteBuffer is ready to be read.
ByteBuffer bbuf = encoder.encode(CharBuffer.wrap(input));
// Convert ISO-LATIN-1 bytes in a ByteBuffer to a character ByteBuffer and then to a string.
// The new ByteBuffer is ready to be read.
CharBuffer cbuf = decoder.decode(bbuf);
return cbuf.toString();
}
// @see http://stackoverflow.com/questions/655891/converting-utf-8-to-iso-8859-1-in-java-how-to-keep-it-as-single-byte
private static String byteEncoding(String input) throws Exception {
Charset utf8charset = Charset.forName("UTF-8");
Charset iso88591charset = Charset.forName("ISO-8859-1");
ByteBuffer inputBuffer = ByteBuffer.wrap(input.getBytes());
// decode UTF-8
CharBuffer data = utf8charset.decode(inputBuffer);
// encode ISO-8559-1
ByteBuffer outputBuffer = iso88591charset.encode(data);
byte[] outputData = outputBuffer.array();
return new String(outputData, "ISO-8859-1");
}
public static Result home() throws Exception {
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
//root elements
Document doc = docBuilder.newDocument();
doc.setXmlVersion("1.0");
doc.setXmlStandalone(true);
Element rootElement = doc.createElement("test");
doc.appendChild(rootElement);
rootElement.setAttribute("original", "héllo");
rootElement.setAttribute("stringToString", new String("héllo".getBytes("UTF-8"), "ISO-8859-1"));
rootElement.setAttribute("stringToBytes", changeEncoding("héllo"));
rootElement.setAttribute("stringToBytes2", byteEncoding("héllo"));
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(doc), new StreamResult(writer));
String output = writer.getBuffer().toString().replaceAll("\n|\r", "");
// The following is Play!Framework specifics for rendering an url, but I believe this is not the problem (I checked in the developer console, the document is correctly in "ISO-8859-1"
response().setHeader("Content-Type", "text/xml; charset=ISO-8859-1");
return ok(output).as("text/xml");
}
And the result :
结果：
<?xml version="1.0" encoding="ISO-8859-1"?>
<test original="h??llo" stringToBytes="h??llo" stringToBytes2="h??llo" stringToString="h????llo"/>
How can I proceed?
我该如何继续？
采纳答案by Cyril N.
For a reason I can't explain, by writing to a file and returning this file to the output fixed the problem of encoding.
由于我无法解释的原因，通过写入文件并将该文件返回到输出修复了编码问题。
I decided to keep this question in case other people had a similar problem.
我决定保留这个问题，以防其他人遇到类似问题。
Here's the snippet :
这是片段：
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
File file = new File("Path/to/file.xml");
transformer.transform(new DOMSource(doc), new StreamResult(file));
response().setHeader("Content-Disposition", "attachment;filename=" + file.getName());
response().setHeader("Content-Type", "text/xml; charset=ISO-8859-1");
return ok(file).as("text/xml");
