用dubbo直接调用webservice

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dubbo webservice 泛化调用

场景：他人的服务端暴露的webservice接口，我这边客户端集成了dubbo，所以想用dubbo直接去调用webservice。因为dubbo的官方文档上说dubbo有提供这些功能。

dubbo版本2.3.0以上版本支持。需要在pom里添加依赖，它是基于CXF的frontend-simple和transports-http实现。maven依赖：

<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-rt-frontend-simple</artifactId>
    <version>2.6.1</version>
</dependency>
<dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-rt-transports-http</artifactId>
    <version>2.6.1</version>
</dependency>

具体做法是：

如果webservice的接口是：http://172.16.123.xxx:8880/xxx/webservice/com.xxx.riviews.webservice.ITongdunService?wsdl

则在dubbo的xml配置里添加

<dubbo:reference id="tongdunServicePortType" interface="com.hylandtec.riviews.webservice.ITongdunService" url="webservice://172.16.123.xxx:8880/xxx/webservice/com.xxx.riviews.webservice.ITongdunService?wsdl"/>

即把url中的http改成webservice，作为dubbo配置中的url，形成点对点的访问。

实际的接口ITongdunService，注意包的路径：

package com.xxxx.riviews.webservice;

/**
 * 同盾接口
 * Created by cd_huang on 2017/4/19.
 */
public interface ITongdunService {
	/**
     *
     * @param arg0
     * @param arg1
     * @return
     */
    String query(String arg0,String arg1);
}

接口的方法和参数对应webservice声明的方法和参数。

使用的时候在调用的类里加上

@Autowired
	private ITongdunService tongdunServicePortType;

String result = tongdunServicePortType.query(arg0, arg1);

即可完成webservice的调用。

这样子调用有个很麻烦的地方，那就是，我接口所在的包路径被定死掉了。然后我就想着能不能用dubbo的泛化调用，即客户端不需要拥有服务端对应的api也能访问的方式。

在

<dubbo:reference id="tongdunServicePortType" interface="com.hylandtec.riviews.webservice.ITongdunService" url="webservice://172.16.123.xxx:8880/xxx/webservice/com.xxx.riviews.webservice.ITongdunService?wsdl"/>

中加入generic="true"配置。

@Autowired
	private GenericService tongdunServicePortType;

调用则为

String result =tongdunServicePortType.$invoke("query", new String[]{"java.lang.String","java.lang.String"}, new Object[] {arg0,arg1}).toString();

完成一个泛化调用。

然后是运行结果：

com.alibaba.dubbo.rpc.RpcException: Failed to invoke remote service: interface com.alibaba.dubbo.rpc.service.GenericService, method: $invoke, cause: Error reading XMLStreamReader.

	at com.alibaba.dubbo.rpc.protocol.AbstractProxyProtocol.getRpcException(AbstractProxyProtocol.java:118)
	at com.alibaba.dubbo.rpc.protocol.AbstractProxyProtocol$2.doInvoke(AbstractProxyProtocol.java:98)
	at com.alibaba.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:144)
	at com.alibaba.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:74)
	at com.onlyou.olyfinance.remote.filter.RemoteTestFilter.invoke(RemoteTestFilter.java:22)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.rpc.filter.GenericImplFilter.invoke(GenericImplFilter.java:138)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:53)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:48)
	at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
	at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)
	at com.alibaba.dubbo.common.bytecode.proxy3.$invoke(proxy3.java)
	at com.onlyou.olyfinance.remote.DemoTestRemote.tongdunTest(DemoTestRemote.java:83)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: org.apache.cxf.binding.soap.SoapFault: Error reading XMLStreamReader.
	at org.apache.cxf.binding.soap.interceptor.Soap11FaultInInterceptor.unmarshalFault(Soap11FaultInInterceptor.java:84)
	at org.apache.cxf.binding.soap.interceptor.Soap11FaultInInterceptor.handleMessage(Soap11FaultInInterceptor.java:51)
	at org.apache.cxf.binding.soap.interceptor.Soap11FaultInInterceptor.handleMessage(Soap11FaultInInterceptor.java:40)
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
	at org.apache.cxf.interceptor.AbstractFaultChainInitiatorObserver.onMessage(AbstractFaultChainInitiatorObserver.java:113)
	at org.apache.cxf.binding.soap.interceptor.CheckFaultInterceptor.handleMessage(CheckFaultInterceptor.java:69)
	at org.apache.cxf.binding.soap.interceptor.CheckFaultInterceptor.handleMessage(CheckFaultInterceptor.java:34)
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
	at org.apache.cxf.endpoint.ClientImpl.onMessage(ClientImpl.java:811)
	at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponseInternal(HTTPConduit.java:1590)
	at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:1486)
	at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1305)
	at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:56)
	at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:623)
	at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:62)
	at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
	at org.apache.cxf.endpoint.ClientImpl.doInvoke(ClientImpl.java:541)
	at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:474)
	at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:377)
	at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:330)
	at org.apache.cxf.frontend.ClientProxy.invokeSync(ClientProxy.java:96)
	at org.apache.cxf.frontend.ClientProxy.invoke(ClientProxy.java:81)
	at com.sun.proxy.$Proxy30.$invoke(Unknown Source)
	at com.alibaba.dubbo.common.bytecode.Wrapper3.invokeMethod(Wrapper3.java)
	at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46)
	at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72)
	at com.alibaba.dubbo.rpc.protocol.AbstractProxyProtocol$2.doInvoke(AbstractProxyProtocol.java:93)
	... 47 more

报错了。debug后发现，泛化调用并不会直接在客户端把$invoke方法改成调用query方法，所以在进入cxf的代码里时，去调用的还是$invoke方法，和webservice声明的query方法不符合，导致webservice解析SOAP的xml协议报错了。看来泛化调用只能在调用的两端都是dubbo的情况下来使用，这是dubbo预留的机制，有点类似Rest调用。

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2017-04-24 12:39
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