SpringMVC 异常统一处理接口 HandlerExceptionResolver

1.源码接口 

/**
 * 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

@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，不然统一归为系统异常
					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，须要添加 @Component 注解，或者增长配置文件 <bean class="com.xxg.ExceptionHandler " /> 。 

配置完成，后台Controller中全部的业务异常都会由ExceptionHandler来处理。