Java系统变量设置方式

近期碰到一个编码的问题，发现整个平台都是用的GB2312，因此导致webservice调用时有些字不能正常接受。

反编译中间件的源码如下：

public static final String node2String(Node node, boolean isPreserveSpace)

  {

    if (node == null)

      return null;

    if (node.getNodeType() == 9) {

      node = ((Document)node).getDocumentElement();

    }

    OutputFormat format = new OutputFormat(node.getOwnerDocument());

    String strEncoding = System.getProperty("xml.encoding");

    if (strEncoding != null) format.setEncoding(strEncoding); else {

     format.setEncoding("GB2312");

    }

    format.setIndenting(false);

    format.setPreserveSpace(isPreserveSpace);

    StringWriter stringOut = new StringWriter();

    XMLSerializer serial = new XMLSerializer(stringOut, format);

    try {

      serial.asDOMSerializer();

      serial.serialize((Element)node);

    } catch (IOException ex) {

      throw new EOSFailure(ex);

    }

    return stringOut.toString();

  }