java打印异常Exception的栈信息

try {
			int a = 9/0;
		} catch (Exception e) {
			
		    StringWriter sw = new StringWriter();  
		    PrintWriter pw = new PrintWriter(sw);  
	        e.printStackTrace(pw);  
	        pw.flush();  
	        sw.flush(); 
	        System.err.println(sw.toString());
		}