Support Tomcat uri encoding (with UTF-8 default)

Introduce an extra `server.tomcat.uri-encoding` property used to
configure the URI encoding for the embedded tomcat container.

Defaults to `UTF-8` instead of the usual tomcat default of `ISO-8859-1`.

Fixes gh-540

spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactory.java

@@ -66,6 +66,7 @@ import org.springframework.util.StreamUtils;
  * @author Phillip Webb
  * @author Dave Syer
  * @author Brock Mills
+ * @author Stephane Nicoll
  * @see #setPort(int)
  * @see #setContextLifecycleListeners(Collection)
  * @see TomcatEmbeddedServletContainer
@@ -93,6 +94,8 @@ public class TomcatEmbeddedServletContainerFactory extends
 
 	private String tldSkip;
 
+	private String uriEncoding = "UTF-8";
+
 	/**
 	 * Create a new {@link TomcatEmbeddedServletContainerFactory} instance.
 	 */
@@ -206,6 +209,10 @@ public class TomcatEmbeddedServletContainerFactory extends
 						.setAddress(getAddress());
 			}
 		}
+		if (getUriEncoding() != null) {
+			connector.setURIEncoding(getUriEncoding());
+		}
+
 		// If ApplicationContext is slow to start we want Tomcat not to bind to the socket
 		// prematurely...
 		connector.setProperty("bindOnInit", "false");
@@ -455,10 +462,28 @@ public class TomcatEmbeddedServletContainerFactory extends
 		return this.additionalTomcatConnectors;
 	}
 
+	/**
+	 * Set the character encoding to use for URL decoding. If not specified 'UTF-8' will
+	 * be used.
+	 * @param uriEncoding the uri encoding to set
+	 */
+	public void setUriEncoding(String uriEncoding) {
+		this.uriEncoding = uriEncoding;
+	}
+
+	/**
+	 * Returns the character encoding to use for URL decoding.
+	 */
+	public String getUriEncoding() {
+		return this.uriEncoding;
+	}
+
 	private static class TomcatErrorPage {
 
 		private final String location;
+
 		private final String exceptionType;
+
 		private final int errorCode;
 
 		private final Object nativePage;

spring-boot/src/test/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactoryTests.java

@@ -44,6 +44,7 @@ import static org.mockito.Mockito.verify;
  * 
  * @author Phillip Webb
  * @author Dave Syer
+ * @author Stephane Nicoll
  */
 public class TomcatEmbeddedServletContainerFactoryTests extends
 		AbstractEmbeddedServletContainerFactoryTests {
@@ -190,11 +191,30 @@ public class TomcatEmbeddedServletContainerFactoryTests extends
 		factory.addConnectorCustomizers((TomcatConnectorCustomizer[]) null);
 	}
 
+	@Test
+	public void uriEncoding() throws Exception {
+		TomcatEmbeddedServletContainerFactory factory = getFactory();
+		factory.setUriEncoding("US-ASCII");
+		Tomcat tomcat = getTomcat(factory);
+		assertEquals("US-ASCII", tomcat.getConnector().getURIEncoding());
+	}
+
+	@Test
+	public void defaultUriEncoding() throws Exception {
+		TomcatEmbeddedServletContainerFactory factory = getFactory();
+		Tomcat tomcat = getTomcat(factory);
+		assertEquals("UTF-8", tomcat.getConnector().getURIEncoding());
+	}
+
 	private void assertTimeout(TomcatEmbeddedServletContainerFactory factory, int expected) {
-		this.container = factory.getEmbeddedServletContainer();
-		Tomcat tomcat = ((TomcatEmbeddedServletContainer) this.container).getTomcat();
+		Tomcat tomcat = getTomcat(factory);
 		Context context = (Context) tomcat.getHost().findChildren()[0];
 		assertThat(context.getSessionTimeout(), equalTo(expected));
 	}
 
+	private Tomcat getTomcat(TomcatEmbeddedServletContainerFactory factory) {
+		this.container = factory.getEmbeddedServletContainer();
+		return ((TomcatEmbeddedServletContainer) this.container).getTomcat();
+	}
+
 }