我在Axis引擎中部署了一个handler，希望用它能够将传递进来的SOAP消息中的一个子元素删除掉，但是用下面的代码似乎只能删除本地SOAPMessage对象中的子元素，对MessageContext无效，也就是还是不能删除传递的SOAP消息中的元素，不知原因何在，还望各位大牛执教,代码如下：
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.FileNotFoundException;

import org.apache.axis.AxisFault;
import org.apache.axis.MessageContext;
import org.apache.axis.Message;
import org.apache.axis.handlers.BasicHandler;
import javax.xml.soap.*;
import java.util.*;


public class WSDemoHandler extends BasicHandler
{
    public void invoke(MessageContext msgContext) throws AxisFault
    {
        SOAPMessage msg=msgContext.getMessage();
      
        SOAPPart part = msg.getSOAPPart();
        SOAPEnvelope env = null;
        SOAPBody body =null;
        try {
            env = part.getEnvelope();

            Name nm = env.createName("inputFile");//要删除掉的子元素名称为“inputFile”

            Iterator it = body.getChildElements();//搜寻每个根元素，要删除的子元素在其中的一个根元素下
            while(it.hasNext())
            {

               SOAPElement child =(SOAPElement)it.next();

                                Iterator target = child.getChildElements(nm);

                while(target.hasNext())
                {
                    SOAPElement temp = (SOAPElement)itChild2.next();

                    temp.detachNode();
                    temp.recycleNode();
                    msg.saveChanges();//不知道是否需要加这句话？
                    System.out.println("delete the child Element");
                }
            }

        } catch (SOAPException e) {
            e.printStackTrace();  //To change body of catch statement use Options | File Templates.
        }

    }
}
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