将XML字符串转为实体类

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具体代码：

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(文件), Charset.forName("utf-8")));
StringBuffer sb = new StringBuffer();
String line;
while((line = br.readLine()) != null){
    sb.append(line);
}
br.close();

// JAXBContext context = JAXBContext.newInstance(实体类.class);
// Unmarshaller unmarshaller = context.createUnmarshaller();
// StringReader sr = new StringReader(sb.toString());
// 实体类 xmlObject = (实体类)unmarshaller.unmarshal(sr);


SOAPMessage message = MessageFactory.newInstance().createMessage(null, new ByteArrayInputStream(sb.toString().getBytes()));
JAXBContext context = JAXBContext.newInstance(实体类.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
实体类 xmlObject = (实体类) unmarshaller.unmarshal(message.getSOAPBody().extractContentAsDocument());

使用cxf生成的Xml实体类：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "实体类", propOrder = {
    "esbflag",
    ...
})
public class 实体类 {

    @XmlElement(name = "ESB_FLAG", required = true, nillable = true)
    protected String esbflag;

    ...
}

可能会碰到以下异常：

Caused by: javax.xml.bind.UnmarshalException: 意外的元素 (uri:"http://xxx.com/XxxSrv", local:"根节点")。所需元素为<{http://xxx.com/XxxSrv}Envelope>
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:712) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:232) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:227) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:94) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1117) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:542) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:524) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:45) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:137) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:214) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:97) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:80) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:341) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:322) ~[jaxb-runtime-2.3.3.jar:2.3.3]
	... 61 common frames omitted

这个需要在实体类上添加@XmlRootElement，指定根节点name与错误信息中的local:"根节点"保持一致：

@XmlRootElement(name = "根节点")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "实体类", propOrder = {
    "esbflag",
    ...
})
public class 实体类 {

    @XmlElement(name = "ESB_FLAG", required = true, nillable = true)
    protected String esbflag;

    ...
}

问题解决！

===========================

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>

========================================

实体类转SOAP报文字符串

实体类 obj = getObj();
JAXBContext context = JAXBContext.newInstance(实体类.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_ENCODING, "GBK");
StringWriter writer = new StringWriter();
marshaller.marshal(obj , writer);
String soapStr = writer.toString();
writer.close();

如果出现以下异常，也是因为@XmlRootElement根节点的原因：

com.sun.istack.SAXException2: 由于类型 "com.etoak.InputParameters" 缺少 @XmlRootElement 注释, 无法将该类型编集为元素

---

方式一：

    public static <T> String bo2Xml(T bo) {
        return bo2Xml(bo, StandardCharsets.UTF_8.name());
    }

    public static <T> String bo2Xml(T bo, String charset) {
        try (StringWriter writer = new StringWriter()) {
            JAXBContext context = JAXBContext.newInstance(bo.getClass());
            Marshaller marshaller = context.createMarshaller();
            //marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.setProperty(Marshaller.JAXB_ENCODING, charset);
            marshaller.marshal(bo, writer);
            return writer.toString();
        } catch (Exception e) {
            log.error("【{}】实体转xml出现异常：", bo.getClass(), e);
            StringWriter stringWriter = new StringWriter();
            e.printStackTrace(new PrintWriter(stringWriter));
            log.error("{}实体转xml出现异常出现异常：{}", bo.getClass(), stringWriter.toString().replaceAll(LINE_SEPARATOR, LINE_SEPARATOR_EXT));
            return "";
        }
    }

    public static <T> T xml2Bo(String xml, Class<T> clazz) throws Exception {
        SOAPMessage message = MessageFactory.newInstance().createMessage(null, new ByteArrayInputStream(xml.getBytes()));
        JAXBContext context = JAXBContext.newInstance(clazz);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        return (T) unmarshaller.unmarshal(message.getSOAPBody().extractContentAsDocument());
    }

方式二：

    public static <T> String bo2Xml(T bo){
        try {
            JAXBContext ctx = JAXBContext.newInstance(new Class[]{bo.getClass()});
            Marshaller marshaller = ctx.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            StringWriter stringWriter = new StringWriter();
            marshaller.marshal(bo, stringWriter);
            return stringWriter.toString();
        } catch (JAXBException e) {
            e.printStackTrace();
            return null;
        }
    }
    public static <T> T xml2Bo(String xml, Class<T> clazz){
        try {
            JAXBContext ctx = JAXBContext.newInstance(new Class[]{clazz});
            Unmarshaller um = ctx.createUnmarshaller();
            return (T) um.unmarshal(new StringReader(xml));
        } catch (JAXBException e) {
            e.printStackTrace();
            return null;
        }
    }