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详解SpringCloud Finchley Gateway 统一异常处理

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springcloud finchley gateway 统一异常处理 。

全文搜索[@@]搜索重点内容标记

1 . 问题:使用springcloud gateway时,会出现各种系统级异常,默认返回html. 。

2 . finchley版本的gateway,使用webflux形式作为底层框架,而不是servlet容器,所以常规的异常处理无法使用 。

翻阅源码,默认是使用defaulterrorwebexceptionhandler这个类实现结构如下:

详解SpringCloud Finchley Gateway 统一异常处理

可以实现参考defaulterrorwebexceptionhandler和abstracterrorwebexceptionhandler自定义实现errorwebexceptionhandler,然后,注册为bean到spring容器中即可(bean name:"errorwebexceptionhandler") 。

具体实现代码如下:

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package pro.chenggang.example.spring.cloud.gateway.support;
 
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.boot.web.reactive.error.errorwebexceptionhandler;
import org.springframework.cloud.gateway.support.notfoundexception;
import org.springframework.http.httpstatus;
import org.springframework.http.mediatype;
import org.springframework.http.codec.httpmessagereader;
import org.springframework.http.codec.httpmessagewriter;
import org.springframework.http.server.reactive.serverhttprequest;
import org.springframework.util. assert ;
import org.springframework.web.reactive.function.bodyinserters;
import org.springframework.web.reactive.function.server.requestpredicates;
import org.springframework.web.reactive.function.server.routerfunctions;
import org.springframework.web.reactive.function.server.serverrequest;
import org.springframework.web.reactive.function.server.serverresponse;
import org.springframework.web.reactive.result.view.viewresolver;
import org.springframework.web.server.responsestatusexception;
import org.springframework.web.server.serverwebexchange;
import reactor.core.publisher.mono;
 
import java.util.collections;
import java.util.hashmap;
import java.util.list;
import java.util.map;
 
/**
  * @classdesc: 统一异常处理,参考{@link org.springframework.web.server.abstracterrorwebexceptionhandler}修改
  * @author: chenggang
  * @createtime: 2018/10/30
  */
public class jsonexceptionhandler implements errorwebexceptionhandler {
 
  private static final logger log = loggerfactory.getlogger(jsonexceptionhandler. class );
 
  /**
   * messagereader
   */
  private list<httpmessagereader<?>> messagereaders = collections.emptylist();
 
  /**
   * messagewriter
   */
  private list<httpmessagewriter<?>> messagewriters = collections.emptylist();
 
  /**
   * viewresolvers
   */
  private list<viewresolver> viewresolvers = collections.emptylist();
 
  /**
   * 存储处理异常后的信息
   */
  private threadlocal<map<string,object>> exceptionhandlerresult = new threadlocal<>();
 
  /**
   * 参考abstracterrorwebexceptionhandler
   * @param messagereaders
   */
  public void setmessagereaders(list<httpmessagereader<?>> messagereaders) {
   assert .notnull(messagereaders, "'messagereaders' must not be null" );
   this .messagereaders = messagereaders;
  }
 
  /**
   * 参考abstracterrorwebexceptionhandler
   * @param viewresolvers
   */
  public void setviewresolvers(list<viewresolver> viewresolvers) {
   this .viewresolvers = viewresolvers;
  }
 
  /**
   * 参考abstracterrorwebexceptionhandler
   * @param messagewriters
   */
  public void setmessagewriters(list<httpmessagewriter<?>> messagewriters) {
   assert .notnull(messagewriters, "'messagewriters' must not be null" );
   this .messagewriters = messagewriters;
  }
 
  @override
  public mono< void > handle(serverwebexchange exchange, throwable ex) {
   /**
    * 按照异常类型进行处理
    */
   httpstatus httpstatus;
   string body;
   if (ex instanceof notfoundexception) {
    httpstatus = httpstatus.not_found;
    body = "service not found" ;
   } else if (ex instanceof responsestatusexception) {
    responsestatusexception responsestatusexception = (responsestatusexception) ex;
    httpstatus = responsestatusexception.getstatus();
    body = responsestatusexception.getmessage();
   } else {
    httpstatus = httpstatus.internal_server_error;
    body = "internal server error" ;
   }
   /**
    * 封装响应体,此body可修改为自己的jsonbody
    */
   map<string,object> result = new hashmap<>( 2 , 1 );
   result.put( "httpstatus" ,httpstatus);
   result.put( "body" ,body);
   /**
    * 错误记录
    */
   serverhttprequest request = exchange.getrequest();
   log.error( "[全局异常处理]异常请求路径:{},记录异常信息:{}" ,request.getpath(),ex.getmessage());
   /**
    * 参考abstracterrorwebexceptionhandler
    */
   if (exchange.getresponse().iscommitted()) {
    return mono.error(ex);
   }
   exceptionhandlerresult.set(result);
   serverrequest newrequest = serverrequest.create(exchange, this .messagereaders);
   return routerfunctions.route(requestpredicates.all(), this ::rendererrorresponse).route(newrequest)
     .switchifempty(mono.error(ex))
     .flatmap((handler) -> handler.handle(newrequest))
     .flatmap((response) -> write(exchange, response));
 
  }
 
  /**
   * 参考defaulterrorwebexceptionhandler
   * @param request
   * @return
   */
  protected mono<serverresponse> rendererrorresponse(serverrequest request) {
   map<string,object> result = exceptionhandlerresult.get();
   return serverresponse.status((httpstatus) result.get( "httpstatus" ))
     .contenttype(mediatype.application_json_utf8)
     .body(bodyinserters.fromobject(result.get( "body" )));
  }
 
  /**
   * 参考abstracterrorwebexceptionhandler
   * @param exchange
   * @param response
   * @return
   */
  private mono<? extends void > write(serverwebexchange exchange,
           serverresponse response) {
   exchange.getresponse().getheaders()
     .setcontenttype(response.headers().getcontenttype());
   return response.writeto(exchange, new responsecontext());
  }
 
  /**
   * 参考abstracterrorwebexceptionhandler
   */
  private class responsecontext implements serverresponse.context {
 
   @override
   public list<httpmessagewriter<?>> messagewriters() {
    return jsonexceptionhandler. this .messagewriters;
   }
 
   @override
   public list<viewresolver> viewresolvers() {
    return jsonexceptionhandler. this .viewresolvers;
   }
 
  }
}

注册bean 。

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/**
  * 自定义异常处理[@@]注册bean时依赖的bean,会从容器中直接获取,所以直接注入即可
  * @param viewresolversprovider
  * @param servercodecconfigurer
  * @return
  */
@primary
@bean
@order (ordered.highest_precedence)
public errorwebexceptionhandler errorwebexceptionhandler(objectprovider<list<viewresolver>> viewresolversprovider,
                servercodecconfigurer servercodecconfigurer) {
 
  jsonexceptionhandler jsonexceptionhandler = new jsonexceptionhandler();
  jsonexceptionhandler.setviewresolvers(viewresolversprovider.getifavailable(collections::emptylist));
  jsonexceptionhandler.setmessagewriters(servercodecconfigurer.getwriters());
  jsonexceptionhandler.setmessagereaders(servercodecconfigurer.getreaders());
  log.debug( "init json exception handler instead default errorwebexceptionhandler success" );
  return jsonexceptionhandler;
}

[@@]注意事项:

1 .上面为示例代码,其中牵扯到策略工厂和响应封装的类,可以自定义实现 。

2 .注册bean时依赖的bean,都会从spring容器中获取到 。

3 .参考此方法思路,可实现统一异常处理,统一封装错误信息.

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:https://segmentfault.com/a/1190000016854364 。

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