java - 如何在Java中的xml字符串中包含 "encoding="UTF-8""？

Question

我正在阅读 customers通过 XStream 对象，然后用空白替换我不需要的任何标签。自 customers包含多个customer它包含它们的 xml 形式。最后.replaceAll("\\<\\?xml(.+?)\\?\\>", "")摆脱多余的<?xml version="1.0" encoding="UTF-8"?>里面customers字符串。

我尝试查找<?xml version="1.0"?>然后将其替换为 <?xml version="1.0" encoding="UTF-8"?>但这并没有引起任何变化。最终输入如下:

<?xml version="1.0"?>

但我想包括 encoding="UTF-8"

清理标签后如何包含该部分？

这里是 XML 的相关代码并将其写入文件。

    //Final XML string of customers
    String xml = xstream.toXML(customers);

    //Remove regex and excess tags
    xml = String.format(xml.replaceAll("<string>", "")
        .replaceAll("</string>", "")
        .replaceAll("<customers>", "")
        .replaceAll("</customers>", "")
        .replaceAll("&lt;", "<")
        .replaceAll("&#13;", "")
        .replaceAll("&gt;", ">")
        .replaceAll("\\<\\?xml(.+?)\\?\\>", ""), 4);

    System.out.println(xml);

    //Create file of grouped XML in a sub-folder
    String timeStamp = new SimpleDateFormat("MM dd yyyy hh.mm.ss a").format(new Date());
    FileWriter fw = new FileWriter("XML Claims\\All Customers" + " " + timeStamp + ".xml");
    fw.write(xml);
    fw.close();

客户对象:

public class Customers {
    //this is a string version of customer object converted through xstream
    public ArrayList<String> customers = new ArrayList<String>();
    public String XMLCreationDate = null;
    public int totalNumberOfRecords = 0;
}

客户对象:

public class Customer {
    public LetterContent letterContent = null;
    public LetterIdentifierInformation letterIdentifierInformation = null;
    public Addressee addressee = null;
}

当前 XML:

<?xml version="1.0"?>
<Customers>
     <Customer>
          <letterContent></letterContent>
          <addressee></address>
     </Customer>
</Customers>

所需的 XML:

<?xml version="1.0" encoding="UTF-8"?>
<Customers>
     <Customer>
          <letterContent></letterContent>
          <addressee></address>
     </Customer>
</Customers>

Answer 1

你可以像下面这样做

XStream xstream = new xStream();  
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();  
Writer writer = new OutputStreamWriter(outputStream, "UTF-8");  
xStream.toXML(object, writer);  
String xml = outputStream.toString("UTF-8");