Add simple custom zuul filter example

ribbon-default-config/resources/application.yml

@@ -0,0 +1,6 @@
+spring:
+  application:
+    name: standalone
+
+server:
+  port: 7777

zuul/src/main/java/demo/ZuulApplication.java

@@ -1,14 +1,64 @@
 package demo;
 
+import javax.servlet.http.HttpServletResponse;
+
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.cloud.netflix.zuul.EnableZuulServer;
+import org.springframework.stereotype.Component;
+
+import com.netflix.zuul.ZuulFilter;
+import com.netflix.zuul.context.RequestContext;
 
 @SpringBootApplication
 @EnableZuulServer
 public class ZuulApplication {
 
-    public static void main(String[] args) {
-        SpringApplication.run(ZuulApplication.class, args);
-    }
+	public static void main(String[] args) {
+		SpringApplication.run(ZuulApplication.class, args);
+	}
 }
+
+@Component
+class SampleStaticResponseFilter extends ZuulFilter {
+
+	private static final String URI = "/static";
+
+	@Override
+	public String filterType() {
+		return "route";
+	}
+
+	@Override
+	public int filterOrder() {
+		return 0;
+	}
+
+	@Override
+	public boolean shouldFilter() {
+		String path = RequestContext.getCurrentContext().getRequest().getRequestURI();
+		if (checkPath(path))
+			return true;
+		if (checkPath("/" + path))
+			return true;
+		return false;
+	}
+
+	private boolean checkPath(String path) {
+		return URI.equals(path);
+	}
+
+	@Override
+	public Object run() {
+		RequestContext ctx = RequestContext.getCurrentContext();
+		// Set the default response code for static filters to be 200
+		ctx.setResponseStatusCode(HttpServletResponse.SC_OK);
+		// first StaticResponseFilter instance to match wins, others do not set body
+		// and/or status
+		if (ctx.getResponseBody() == null) {
+			ctx.setResponseBody("Hello World");
+			ctx.setSendZuulResponse(false);
+		}
+		return null;
+	}
+}

zuul/src/main/resources/application.properties

@@ -1,4 +1,3 @@
-spring.application.name: zuulproxy
+spring.application.name: zuul
 server.port: 9900
-zuul.routes.ui.path: /ui/**
-zuul.routes.ui.url: http://localhost:8080
+zuul.routes.ui.path: /static/**

zuul/src/test/java/demo/ZuulApplicationTests.java

@@ -1,11 +1,14 @@
 package demo;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
 import org.springframework.boot.test.WebIntegrationTest;
 import org.springframework.cloud.client.discovery.DiscoveryClient;
 import org.springframework.cloud.client.discovery.noop.NoopDiscoveryClient;
@@ -15,18 +18,24 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = ZuulApplication.class)
 @DirtiesContext
-@WebIntegrationTest(randomPort=true)
+@WebIntegrationTest(randomPort = true)
 public class ZuulApplicationTests {
 
 	@Autowired
 	DiscoveryClient discoveryClient;
 
+	@Value("${local.server.port}")
+	int port;
+
 	@Test
 	public void contextLoads() {
+		assertEquals("Hello World", new TestRestTemplate()
+				.getForObject("http://localhost:" + this.port + "/static", String.class));
 	}
 
 	@Test
 	public void discoveryClientIsNoop() {
-		assertTrue("discoveryClient is wrong type", discoveryClient instanceof NoopDiscoveryClient);
+		assertTrue("discoveryClient is wrong type",
+				this.discoveryClient instanceof NoopDiscoveryClient);
 	}
 }