Dubbo消费者consumer捕捉服务提供者provider抛出的自定义异常

在一个公共包里定义一个异常类,继承自RuntimeException。


public class BusinessException extends RuntimeException {

    /**
     * 异常code
     */
    private String code;

    public BusinessException() {
        super();
    }

    public BusinessException(String message) {
        super(message);
    }

    public BusinessException(String code, String message) {
        super(message);
        this.code = code;
    }

    public BusinessException(String message, Throwable cause) {
        super(message, cause);
    }

    public BusinessException(String code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }

    public BusinessException(Throwable cause) {
        super(cause);
    }


    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
}

在服务提供者的Dubbo配置文件中添加下面的内容,主要就是自定义exceptionFilter,然后排出dubbo自带的exceptionFilter

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
     http://code.alibabatech.com/schema/dubbo
     http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- http://dubbo.apache.org/schema/dubbo/dubbo.xsd 上面配置为这个一直报错,改为 http://code.alibabatech.com/schema/dubbo/dubbo.xsd -->

    <!--用于配置当前应用信息,不管该应用是提供者还是消费者 -->
    <dubbo:application  name="dubbo-web-provide"/>
    <!-- 用于配置连接注册中心相关信息 -->
    <dubbo:registry address="zookeeper://localhost:2181" timeout="30000">
        <!--配置redis连接参数 -->
        <!--具体参数配置见com.alibaba.dubbo.registry.redis.RedisRegistry.class -->
        <dubbo:parameter key="max.idle" value="10" />
        <dubbo:parameter key="min.idle" value="5" />
        <dubbo:parameter key="max.active" value="20" />
        <dubbo:parameter key="max.total" value="100" />
    </dubbo:registry>

    <!--
    最重要的就是下面的配置:自定义exceptionFilter,然后排出dubbo自带的exceptionFilter
    payload 设置传输的最大值
    -->
    <dubbo:provider filter="dubboExceptionFilter,-exception" payload="123886080" ></dubbo:provider>

    <!-- 用于配置提供服务的协议信息,协议由提供方指定,消费方被动接受 -->
    <dubbo:protocol name="dubbo" port="20880" accesslog="true" serialization="hessian2" />

    <!-- 实现类 -->
    <bean id="helloService" class="cn.ydstudio.dubbo.web.provide.serviceimpl.HelloServiceImpl" />
    <bean id="goodsService" class="cn.ydstudio.dubbo.web.provide.serviceimpl.GoodsServiceImpl" />
    <bean id="goodsService2" class="cn.ydstudio.dubbo.web.provide.serviceimpl.GoodsServiceImpl2" />
    <bean id="goodsOrderServiceRemoteImpl" class="cn.ydstudio.dubbo.web.provide.serviceimpl.GoodsOrderServiceRemoteImpl" />

    <!--定义暴露服务的接口,用于暴露一个服务,定义服务的元信息,一个服务可以用多个协议暴露,一个服务也可以注册到多个注册中心 -->
    <!--每个接口都应定义版本号,为后续不兼容升级提供可能 -->
    <!--ref:服务的真正实现类 -->
    <dubbo:service interface="cn.ydstudio.dubbo.rpc.service.HelloService" ref="helloService" version="1.0.0" retries="1"/>
    <dubbo:service interface="cn.ydstudio.dubbo.rpc.service.GoodsService" ref="goodsService" version="1.0.0" retries="1"/>
    <dubbo:service interface="cn.ydstudio.dubbo.rpc.service.GoodsService" ref="goodsService2" version="2.0.0" retries="1"/>
    <dubbo:service interface="cn.ydstudio.dubbo.rpc.service.GoodsOrderServiceRemote" ref="goodsOrderServiceRemoteImpl" version="1.0.0" retries="0" >
        <dubbo:method name="querGoodsOrderList" timeout="1000000"/>
    </dubbo:service>

    <!--监控中心配置 监控中心协议,如果为protocol="registry",表示从注册中心发现监控中心地址,否则直连监控中心。 -->
    <!--<dubbo:monitor protocol="registry"></dubbo:monitor>-->
    <!-- 直连监控中心服务器地址 -->
    <!-- <dubbo:monitor address="localhost:6379"></dubbo:monitor> --> 
</beans>

最重要的继承ExceptionFilter,然后重写invoke方法

package cn.ydstudio.dubbo.web.provide.filter;

import cn.ydstudio.common.tools.exception.BizException;
import cn.ydstudio.common.tools.exception.BusinessException;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.ReflectUtils;
import com.alibaba.dubbo.common.utils.StringUtils;
import com.alibaba.dubbo.rpc.*;
import com.alibaba.dubbo.rpc.filter.ExceptionFilter;
import com.alibaba.dubbo.rpc.service.GenericService;

import java.lang.reflect.Method;

/**
 * 功能描述:<br/>
 *
 * @Author 刘洋【19037900】
 * @Date 2019/4/30 18:02
 */

public class DubboExceptionFilter extends ExceptionFilter {

    private final Logger logger;

    public DubboExceptionFilter() {
        this(LoggerFactory.getLogger(com.alibaba.dubbo.rpc.filter.ExceptionFilter.class));
    }

    public DubboExceptionFilter(Logger logger) {
        this.logger = logger;
    }

    @Override
    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        try {
            Result result = invoker.invoke(invocation);
            if (result.hasException() && GenericService.class != invoker.getInterface()) {

                try {
                    Throwable exception = result.getException();

                    // 自定义的异常
                    if (exception instanceof BizException || exception instanceof BusinessException){
                        return result;
                    }

                    if (!(exception instanceof RuntimeException) && exception instanceof Exception) {
                        return result;
                    } else {
                        try {
                            Method method = invoker.getInterface().getMethod(invocation.getMethodName(), invocation.getParameterTypes());
                            Class<?>[] exceptionClassses = method.getExceptionTypes();
                            Class[] arr$ = exceptionClassses;
                            int len$ = exceptionClassses.length;

                            for (int i$ = 0; i$ < len$; ++i$) {
                                Class<?> exceptionClass = arr$[i$];
                                if (exception.getClass().equals(exceptionClass)) {
                                    return result;
                                }
                            }
                        } catch (NoSuchMethodException var11) {
                            return result;
                        }

                        this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + exception.getClass().getName() + ": " + exception.getMessage(), exception);
                        String serviceFile = ReflectUtils.getCodeBase(invoker.getInterface());
                        String exceptionFile = ReflectUtils.getCodeBase(exception.getClass());
                        if (serviceFile != null && exceptionFile != null && !serviceFile.equals(exceptionFile)) {

                            String className = exception.getClass().getName();
                            if (!className.startsWith("java.") && !className.startsWith("javax.")) {
                                return (Result) (exception instanceof RpcException ? result : new RpcResult(new RuntimeException(StringUtils.toString(exception))));
                            } else {
                                return result;
                            }
                        } else {
                            return result;
                        }
                    }
                } catch (Throwable var12) {
                    this.logger.warn("Fail to ExceptionFilter when called by " + RpcContext.getContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + var12.getClass().getName() + ": " + var12.getMessage(), var12);
                    return result;
                }
            } else {
                return result;
            }
        } catch (RuntimeException var13) {
            this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + var13.getClass().getName() + ": " + var13.getMessage(), var13);
            throw var13;
        }
    }

}

然后在provider可以直接抛出异常,在consumer可以直接捕捉到。consumer服务消费端可以新建一个全局异常处理的控制器,可以格式化后输出给前端。

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