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瑞吉外卖：全局异常处理

升级版：同步异常和异步异常都处理

• 范围：带有@Controller的方法或类
• 捕捉：错误为Exception的异常
• 采用logger进行记录
• request.getHeader("x-requested-with") == XMLHttpRequest 的请求是异步请求
• 如果发生错误会自动跳到error/404.html 或者 error/500.html

@ControllerAdvice(annotations = Controller.class)
public class ExceptionAdvice {
    private static final Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class);

    @ExceptionHandler({Exception.class})
    public void handleException(Exception e, HttpServletRequest request, HttpServletResponse response) throws IOException {
        logger.error("服务器发生异常: " + e.getMessage());
        for (StackTraceElement element : e.getStackTrace()) {
            logger.error(element.toString());
        }

        /**
         * 判断是同步异常，还是异步异常
         * 同步异常 返回错误页面
         * 异步异常 返回json字符串
         */

        String xRequestedWith = request.getHeader("x-requested-with");
        if ("XMLHttpRequest".equals(xRequestedWith)) {
            response.setContentType("application/plain;charset=utf-8");
            PrintWriter writer = response.getWriter();
            writer.write(CommunityUtil.getJSONString(1, "服务器异常!"));
        } else {
            response.sendRedirect(request.getContextPath() + "/error");
        }
    }
}