https://my.oschina.net/u/2433960/blog/912760
1.源码接口
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/** * 源码接口定义 */ public interface HandlerExceptionResolver { ModelAndView resolveException( HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex); } |
2.源码接口实现
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@Component public class ExceptionHandler implements HandlerExceptionResolver { @Override public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { // 判断是否AJAX请求 if (request.getHeader("x-requested-with") != null && request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) { try { response.setContentType("application/json;charset=UTF-8"); PrintWriter writer = response.getWriter(); Map<String, Object> map = new HashMap<String, Object>(); map.put("success", false); if (ex instanceof MessageException) {// 安全起见，业务异常前端可见，否则统一归为系统异常 map.put("errorMsg", ex.getMessage()); } else { map.put("errorMsg", "系统异常！"); } Gson gson = new Gson(); writer.write(gson.toJson(map)); writer.flush(); writer.close(); } catch (IOException e) { e.printStackTrace(); } } Map<String, Object> model = new HashMap<>(); return new ModelAndView("/error", model); } } |
ExceptionHandler 实现 HandlerExceptionResolver接口，需要添加 @Component 注解，或者增加配置文件
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<bean class="com.xxg.ExceptionHandler " /> |
。
配置完成，后台Controller中所有的业务异常都会由ExceptionHandler来处理。
