zuul 自定义异常处理

两种方式
1.自定义error错误页面

/**
 * 自定义error错误页面
 * @author zhiguang
 */
@RestController
public class ErrorHandlerController implements ErrorController {

    /**
     * 出异常后进入该方法，交由下面的方法处理
     */
    @Override
    public String getErrorPath() {
        return "/error";
    }

    @RequestMapping("/error")
    public Object error(){
        RequestContext ctx = RequestContext.getCurrentContext();
        ZuulException exception = (ZuulException)ctx.getThrowable();
        return Result.choose(exception.nStatusCode, exception.getMessage());
    }

}

我这里是返回的json信息

2.禁用zuul默认的异常处理filter---SendErrorFilter
  在yml中设置
zuul:
    SendErrorFilter:
        error:
            disable:true

然后自定义errorfilter

public class ErrorFilter extends ZuulFilter {

    private static final Logger logger = LoggerFactory.getLogger(ErrorFilter.class);

    @Override
    public String filterType() {
        return "error";
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        try {
            RequestContext context = RequestContext.getCurrentContext();
            ZuulException exception = this.findZuulException(context.getThrowable());
            logger.error("进入系统异常拦截", exception);

            HttpServletResponse response = context.getResponse();
            response.setContentType("application/json; charset=utf8");
            response.setStatus(exception.nStatusCode);
            PrintWriter writer = null;
            try {
                writer = response.getWriter();
                writer.print("{code:"+ exception.nStatusCode +",message:\""+ exception.getMessage() +"\"}");
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if(writer!=null){
                    writer.close();
                }
            }

        } catch (Exception var5) {
            ReflectionUtils.rethrowRuntimeException(var5);
        }

        return null;
    }

    ZuulException findZuulException(Throwable throwable) {
        if (ZuulRuntimeException.class.isInstance(throwable.getCause())) {
            return (ZuulException)throwable.getCause().getCause();
        } else if (ZuulException.class.isInstance(throwable.getCause())) {
            return (ZuulException)throwable.getCause();
        } else {
            return ZuulException.class.isInstance(throwable) ? (ZuulException)throwable : new ZuulException(throwable, 500, (String)null);
        }
    }
}

可以看看SendErrorFilter这个类的源码,这是zuul的默认异常处理类

今天处理异常发现404不走过滤器

   还是走的errorcontroller

/**
 * 自定义error错误页面
 * @author zhiguang
 */
@RestController
public class ErrorHandlerController implements ErrorController {

    /**
     * 出异常后进入该方法，交由下面的方法处理
     */
    @Override
    public String getErrorPath() {
        return "/error";
    }

    @RequestMapping("/error")
    public Object error(HttpServletRequest request, HttpServletResponse response){
        //
        /*RequestContext ctx = RequestContext.getCurrentContext();
        ZuulException exception = (ZuulException)ctx.getThrowable();
        return Result.choose(exception.nStatusCode, exception.getMessage());*/
        Integer status = (Integer)request.getAttribute("javax.servlet.error.status_code");
        return Result.choose(status, status == 404 ? "访问地址不存在" : "内部服务器错误,正在处理");
    }

}

可以查看BasicErrorController;类的源码