Zuul服务网关的自定义异常过滤器

在springcloud中，网关发生异常时，我们需要自定义返回的异常信息给用户看

那么我们就需要自定义异常过滤器了

首先我们需要停用内置的默认异常处理器SendErrorFilter，不然还是走的他默认的异常过滤器

在yml中的配置为：

zuul:
  SendErrorFilter:
    error:
      disable: true

可以继承SendErrorFilter 类，也可以继承ZuulFilter类，实现结果都一样

package com.qiangqiang.filter;

import com.netflix.zuul.context.RequestContext;
import org.springframework.cloud.netflix.zuul.filters.post.SendErrorFilter;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * \* Created with IntelliJ IDEA.
 * \* @author: xiyue
 * \* Date: 2021/1/12
 * \* Time: 13:16
 * \* To change this template use File | Settings | File Templates.
 * \* Description:
 * \
 */
@Component
public class CustomSendErrorFilter extends SendErrorFilter {
    @Override
    public String filterType() {
        return super.filterType();
    }

    @Override
    public int filterOrder() {
        return super.filterOrder();
    }

    @Override
    public boolean shouldFilter() {
        return super.shouldFilter();
    }

    @Override
    public Object run() {
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletResponse response = ctx.getResponse();
        try {
            int responseStatusCode = ctx.getResponseStatusCode();
            // 此处自定义响应体start
            String cumstomBody = "{当前服务出现异常}";//内容省略...
            // 此处自定义响应体end
            response.setStatus(ctx.getResponseStatusCode());
            response.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
            response.getOutputStream().write(cumstomBody.getBytes());
        } catch (IOException e) {
            ReflectionUtils.rethrowRuntimeException(e);
        }
        return null;
    }
}