java - JAXB 编码为 StringWriter : Is it necassary to declare the string encoding (e. g。 UTF-8)？

Question

使用这段代码:

        JAXBContext jaxbContext = JAXBContext.newInstance( aObj.getClass());
        Marshaller marshaller = jaxbContext.createMarshaller();
        StringWriter sw = new StringWriter();
        marshaller.marshal( aObj, sw);
        return sw.toString();

我正在将一个 JAXB 对象直接序列化为一个 StringWriter:我的示例表明像“ü”这样的两个字节 UTF-8 字符被完美序列化，即它们按预期包含在生成的 java 字符串中。稍后，当通过套接字发送时，生成的 java 字符串被序列化为 aXml.getBytes( "UTF-8")。

如果上述编码器没有明确声明 UTF-8 字符编码，会不会有危险？

Answer 1

这并不危险。

By default, the Marshaller will use UTF-8 encoding when generating XML data to a java.io.OutputStream, or a java.io.Writer. Use the setProperty API to change the output encoding used during these marshal operations. Client applications are expected to supply a valid character encoding name as defined in the W3C XML 1.0 Recommendation and supported by your Java Platform.

jaxb.encoding - 值必须是 java.lang.String编码 XML 数据时使用的输出编码。如果未指定此属性，Marshaller 将默认使用“UTF-8”。

Reference here