如何在JAVA中计算soap消息体的大小

import javax.xml.soap.*;

public class SoapMessageSizeCalculator {

    public static void main(String[] args) {
        // 创建SOAP消息体对象
        SOAPMessage soapMessage = createSoapMessage();
        
        // 将SOAP消息体转化为字符串
        String soapString = convertSoapToString(soapMessage);
        
        // 计算字符串的字节数
        int soapSize = calculateStringSize(soapString);
        
        System.out.println("SOAP消息体的大小：" + soapSize + "字节");
    }

    // 创建SOAP消息体对象
    public static SOAPMessage createSoapMessage() {
        // 使用JAX-WS库创建SOAP消息体对象
        // 这里只是示例代码，具体的SOAP消息体内容根据实际需求进行创建
        try {
            MessageFactory messageFactory = MessageFactory.newInstance();
            SOAPMessage soapMessage = messageFactory.createMessage();
            SOAPPart soapPart = soapMessage.getSOAPPart();
            SOAPEnvelope soapEnvelope = soapPart.getEnvelope();
            SOAPBody soapBody = soapEnvelope.getBody();
            SOAPElement soapElement = soapBody.addChildElement("HelloWorld");
            soapElement.addTextNode("Hello, World!");
            return soapMessage;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    // 将SOAP消息体转化为字符串
    public static String convertSoapToString(SOAPMessage soapMessage) {
        try {
            // 使用JAX-WS库提供的Transformer将SOAP消息体转化为字符串
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            Source sourceContent = soapMessage.getSOAPPart().getContent();
            StringWriter stringWriter = new StringWriter();
            transformer.transform(sourceContent, new StreamResult(stringWriter));
            return stringWriter.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    // 计算字符串的字节数
    public static int calculateStringSize(String str) {
        try {
            // 使用JAVA的内置函数将字符串转化为字节数组，并获取字节数组的长度
            byte[] bytes = str.getBytes();
            return bytes.length;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return -1;
    }
}