xjc使用的openjdk实现 com.sun.xml.internal.bind.api.impl.NameConverter#toVariableName 将属性名转换为成员变量名。似乎没有实现可以保持变量名“原样”。如果适用，您可以编写自己的xjc插件，将私有属性名设置为其公共名称。插件可能是这样的：

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;

import com.sun.tools.xjc.Options;
import com.sun.tools.xjc.Plugin;
import com.sun.tools.xjc.model.CClassInfo;
import com.sun.tools.xjc.model.CPropertyInfo;
import com.sun.tools.xjc.model.Model;
import com.sun.tools.xjc.outline.Outline;

public class XJCPlugin extends Plugin {
    @Override
    public String getOptionName() {
        return "XsameElementNames";
    }

    @Override
    public int parseArgument(Options opt, String[] args, int i) {
        return 1;
    }

    @Override
    public String getUsage() {
        return "  -XsameElementNames    :  set property private name as its public name";
    }

    @Override
    public void postProcessModel(Model model, ErrorHandler errorHandler) {
        for (CClassInfo c : model.beans().values()) {
            for (CPropertyInfo prop : c.getProperties()) {
                prop.setName(false, prop.getName(true));
            }
        }
    }

    @Override
    public boolean run(Outline arg0, Options arg1, ErrorHandler arg2) throws SAXException {
        return true;
    }
}