Add toString() to IpAddressMatcher.java

Closes gh-16795

Signed-off-by: wtigerhyunsu <jack951@naver.com>

web/src/main/java/org/springframework/security/web/util/matcher/IpAddressMatcher.java

@@ -130,4 +130,11 @@ public final class IpAddressMatcher implements RequestMatcher {
 		}
 	}
 
+	@Override
+	public String toString() {
+		String hostAddress = this.requiredAddress.getHostAddress();
+		return (this.nMaskBits < 0) ? "IpAddress [" + hostAddress + "]"
+				: "IpAddress [" + hostAddress + "/" + this.nMaskBits + "]";
+	}
+
 }

web/src/test/java/org/springframework/security/web/util/matcher/IpAddressMatcherTests.java

@@ -153,4 +153,18 @@ public class IpAddressMatcherTests {
 			.withMessage("ipAddress cannot be empty");
 	}
 
+	// gh-16795
+	@Test
+	public void toStringWhenCidrIsProvidedThenReturnsIpAddressWithCidr() {
+		IpAddressMatcher matcher = new IpAddressMatcher("192.168.1.0/24");
+		assertThat(matcher.toString()).hasToString("IpAddress [192.168.1.0/24]");
+	}
+
+	// gh-16795
+	@Test
+	public void toStringWhenOnlyIpIsProvidedThenReturnsIpAddressOnly() {
+		IpAddressMatcher matcher = new IpAddressMatcher("127.0.0.1");
+		assertThat(matcher.toString()).hasToString("IpAddress [127.0.0.1]");
+	}
+
 }