//返回消息框的无格式文本content是一个JTextPane元件

public String getContentPlainText()

{

   StringBuffer text=new StringBuffer();

   Document   doc   =   content.getDocument();

   Element   root   =   doc.getDefaultRootElement(); 

   int count=root.getElementCount();

   for(int i=0;i<count;i++)

   {

    Element   para   =   root.getElement(i);

    int   start   =   para.getStartOffset();

          int   end   =   para.getEndOffset();

          try

          {

           text.append(doc.getText(start,   end   -   start));

          }

          catch(Exception err)

          {

           err.printStackTrace();

          }

   }

   System.out.println("text:" + text);

         return text.toString();

}