[Dubbo-900] Fix 通过 override 修改 hessian协议的提供者的配置 不生效 #900 (#3363)

* reExport fail fix#900

* modify

* use Objects.equals

* compare URL for all proxy protocol

Author: CrazyHZM

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/protocol/AbstractProxyProtocol.java

@@ -28,6 +28,7 @@
 import org.apache.dubbo.rpc.RpcException;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
@@ -66,7 +67,10 @@ public <T> Exporter<T> export(final Invoker<T> invoker) throws RpcException {
         final String uri = serviceKey(invoker.getUrl());
         Exporter<T> exporter = (Exporter<T>) exporterMap.get(uri);
         if (exporter != null) {
-            return exporter;
+            // When modifying the configuration through override, you need to re-expose the newly modified service.
+            if (Objects.equals(exporter.getInvoker().getUrl(), invoker.getUrl())) {
+                return exporter;
+            }
         }
         final Runnable runnable = doExport(proxyFactory.getProxy(invoker, true), invoker.getInterface(), invoker.getUrl());
         exporter = new AbstractExporter<T>(invoker) {

dubbo-rpc/dubbo-rpc-webservice/src/test/java/org/apache/dubbo/rpc/protocol/webservice/WebserviceProtocolTest.java

@@ -18,6 +18,7 @@
 
 import org.apache.dubbo.common.URL;
 import org.apache.dubbo.common.extension.ExtensionLoader;
+import org.apache.dubbo.rpc.Exporter;
 import org.apache.dubbo.rpc.Protocol;
 import org.apache.dubbo.rpc.ProxyFactory;
 
@@ -37,9 +38,10 @@ public class WebserviceProtocolTest {
     @Test
     public void testDemoProtocol() throws Exception {
         DemoService service = new DemoServiceImpl();
-        protocol.export(proxy.getInvoker(service, DemoService.class, URL.valueOf("webservice://127.0.0.1:9019/" + DemoService.class.getName() + "?codec=exchange")));
+        Exporter<DemoService> exporter = protocol.export(proxy.getInvoker(service, DemoService.class, URL.valueOf("webservice://127.0.0.1:9019/" + DemoService.class.getName() + "?codec=exchange")));
         service = proxy.getProxy(protocol.refer(DemoService.class, URL.valueOf("webservice://127.0.0.1:9019/" + DemoService.class.getName() + "?codec=exchange&timeout=3000")));
         assertEquals(service.getSize(new String[]{"", "", ""}), 3);
+        exporter.unexport();
     }
 
     @Test