SpringMVC异常处理之HandlerExceptionResolver

我就是我 2022-04-13 08:51 152阅读 0赞

上一篇文章介绍了如何使用`@ExceptionHandler`注解来处理全局异常[SpringMVC异常处理之ExceptionHandler][SpringMVC_ExceptionHandler]，本篇文章主要介绍使用HandlerExceptionResolver处理异常。

public interface HandlerExceptionResolver {
    	ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex);
    }

HandlerExceptionResolver接口中定义了一个resolveException方法，用于处理Controller中的异常。Exception ex参数即Controller抛出的异常。返回值类型是ModelAndView，可以通过这个返回值来设置异常时显示的页面。

1.  定义一个类实现HandlerExceptionResolver接口

@Component
    public class  ExceptionHandler implements HandlerExceptionResolver {
    
        private static final Logger logger = LoggerFactory.getLogger(ExceptionHandler.class);
    
        @Override
        public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                Object o, Exception e) {
            String requestType = httpServletRequest.getHeader("X-Requested-With");
            String contentType = httpServletRequest.getContentType() == null ? "" : httpServletRequest.getContentType().toLowerCase();
    
            String message = e.getMessage();
            if (e instanceof GeneralException) { // 用户自定义异常
                message = ((GeneralException) e).getSimpleMessage();
            } else { // 通用异常
                message = "系统异常！";
            }
          
            // 判断是否是Ajax 请求
            if (contentType.contains("application/json") || (StringUtils.isNotEmpty(requestType)
                    && ("XMLHttpRequest".equalsIgnoreCase(requestType))) {
                Assert.notNull(httpServletResponse);
                httpServletResponse.setContentType("text/json;charset=utf-8");
                ModelAndView modelAndView = new ModelAndView();
                // 返回异常信息(JSON)
                try  {
                	PrintWriter writer = httpServletResponse.getWriter()
                    writer.write(message);
                    writer.flush();
                } catch (IOException ignore) {
                } finally {
                    modelAndView.clear();
                    return modelAndView;
                }
            } else { // 页面跳转
                Map<String, Object> modal = new HashMap<>();
                modal.put("exceptionMessage", message);
                modal.put("ex", e);
                return new ModelAndView("error/error", modal);
            }
        }
    }

2.在Controller方法中抛出异常

@RequestMapping("test")
        public Object test() throws Exception {
            if ("XXXX".equals(type)) {
                // 由customGenericExceptionHnadler处理
                throw new GeneralException(ErrorCode.INTERNAL_ERROR, "XX错误");
            } 
            if ("YYYY".equals(type)) {
                // 由handleAllException处理
                throw new IOException();
            } 
           // 如果业务操作有异常，由handleAllException处理
        }

至此，ExceptionHandler即可对全局异常进行处理。

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[SpringMVC_ExceptionHandler]: https://blog.csdn.net/hzygcs/article/details/84586882