!835 add UrlBuilder getPortWithDefault

Merge pull request !835 from 不忘初心/v5-dev

hutool-core/src/main/java/cn/hutool/core/net/url/UrlBuilder.java

@@ -291,6 +291,20 @@ public final class UrlBuilder implements Builder<String> {
 		return port;
 	}
 
+	/**
+	 * 获取端口，如果未自定义返回协议默认端口
+	 *
+	 * @return 端口
+	 */
+	public int getPortWithDefault() {
+		int port = getPort();
+		if (port > 0) {
+			return port;
+		}
+		URL url = this.toURL();
+		return url.getDefaultPort();
+	}
+
 	/**
 	 * 设置端口，默认-1
 	 *

hutool-core/src/test/java/cn/hutool/core/net/UrlBuilderTest.java

@@ -16,8 +16,10 @@ public class UrlBuilderTest {
 
 	@Test
 	public void buildTest() {
-		final String buildUrl = UrlBuilder.of().setHost("www.hutool.cn").build();
+		UrlBuilder builder = UrlBuilder.of();
+		final String buildUrl = builder.setHost("www.hutool.cn").build();
 		Assert.assertEquals("http://www.hutool.cn/", buildUrl);
+		Assert.assertEquals(buildUrl, 80, builder.getPortWithDefault());
 	}
 
 	@Test
@@ -26,9 +28,11 @@ public class UrlBuilderTest {
 		String buildUrl = UrlBuilder.of().setScheme("http").setHost("192.168.1.1").setPort(8080).setWithEndTag(false).build();
 		Assert.assertEquals("http://192.168.1.1:8080", buildUrl);
 
-		buildUrl = UrlBuilder.of().setScheme("http").setHost("192.168.1.1").setPort(8080).addQuery("url", "http://192.168.1.1/test/1")
+		UrlBuilder urlBuilder = UrlBuilder.of();
+		buildUrl = urlBuilder.setScheme("http").setHost("192.168.1.1").setPort(8080).addQuery("url", "http://192.168.1.1/test/1")
 				.setWithEndTag(false).build();
 		Assert.assertEquals("http://192.168.1.1:8080?url=http://192.168.1.1/test/1", buildUrl);
+		Assert.assertEquals(buildUrl, 8080, urlBuilder.getPortWithDefault());
 	}
 
 	@Test