java web项目整体异常处理机制

//~ Methods ========================================================================================================
	@ExceptionHandler()
	public @ResponseBody String handle(Exception exception, HttpServletRequest request, HttpServletResponse response) {
		logger.error(request.getRequestURI() + " 请求失败", exception);
		
		ResponseData data = new ResponseData(false, exception.getClass() + ": " + exception.getMessage());
		data.setRequestURI(request.getRequestURI());
		
		StackTraceElement[] trace = exception.getStackTrace();
		StringBuilder traceContent = new StringBuilder();
        for (int i=0; i < trace.length; i++)
        	traceContent.append("\tat " + trace[i]);
		data.setExecptionTrace(traceContent.toString());
		
		String json = "";
		try {
			json = mapper.writeValueAsString(data);
		} catch (Exception e1) {
			e1.printStackTrace();
		}
		
		if(!(request.getRequestURI().endsWith(".json") || request.getRequestURI().endsWith("Json")))
			throw new RuntimeException(exception);
		
		response.setStatus(500);//服务端处理失败
		response.setContentType("application/json;charset=UTF-8");
		return json;
	}

//Ajax请求完成执行。判断Session超时，如果超时或者无效，返回的内容为login.jsp页面的内容,页面包含：AJAX-AccessDeniedException
//如果页面包含AJAX-AccessDeniedException，说明session超时或者无效。
Ext.Ajax.on('requestcomplete', function(conn, response, options){
	if(options.params['REQUEST_MODE'] == "AJAX" &&
		response.responseText.indexOf("AJAX-AccessDeniedException") != -1) {
		Ext.Msg.alert('提示', '会话超时，请重新登录!', function(){
            window.location = './login'; 
        });
	}
});

Ext.Ajax.on('requestexception', function(conn, response, options){
	//ajax请求，出现异常，弹出窗口提示信息。
	//var json = response.responseText.replace("</generated></generated>", "");
	var json = response.responseText;
	var data = Ext.decode(json);

	Ext.Msg.alert('提示', "请求URI："+ data.requestURI + "<br>错误信息："+ 
		data.message + "<br><a href='#'>错误堆栈信息</a>", function(){
    });
	return false;
});