Spring异常解析器HandlerExceptionResolver

一、spring异常解析器

1. 为什么使用：系统产生的异常，如果没被捕获，会返回给客户端，用户会看到看不懂的异常信息，体验不好

2. 作用：全局异常捕获，统一处理异常

3. HandlerExceptionResolver接口

public interface HandlerExceptionResolver {
    @Nullable
    ModelAndView resolveException(HttpServletRequest var1, HttpServletResponse var2, @Nullable Object var3, Exception var4);
}

二、定义自己的异常解析器，实现HandlerExceptionResolver

@Component
@Slf4j
public class BusinesExceptionHandler implements HandlerExceptionResolver {
    private static String errorMsg = "服务器繁忙，请稍后尝试";
    private static String nullErrorMsg = "null";

    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        ModelAndView modelAndView = new ModelAndView(new MappingJackson2JsonView());
        modelAndView.addObject("message", msg);
        modelAndView.addObject("code", code);
        return modelAndView;
    }
}

三、把自定义的异常解析器，注册到异常解析器列表

@Configuration
@Slf4j
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
        resolvers.add(new BusinesExceptionHandler());
    }
}

参考：

https://blog.csdn.net/qq_22172133/article/details/82147630

https://www.cnblogs.com/taiguyiba/p/11817930.html