将异常信息保存到String

将异常信息保存到String中:
private String exceptionToString(Throwable e){
		try{
			StringWriter sw = new StringWriter(); 
			PrintWriter pw=new PrintWriter(sw);
			e.printStackTrace(pw);
			String errorMsg=sw.toString();
			return errorMsg;
		}catch(Throwable e1){
			
		}
		return "";
	}