add test

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

@@ -424,11 +424,6 @@ public class UrlBuilderTest {
 		Assert.assertEquals("http://127.0.0.1/devicerecord/list?start=2022-03-31%2000:00:00&end=2022-03-31%2023:59:59&page=1&limit=10", builder.toString());
 	}
 
-	@Test
-	public void issue2242Test() {
-
-	}
-
 	@Test
 	public void issue2243Test() {
 		// https://github.com/dromara/hutool/issues/2243

hutool-http/src/test/java/cn/hutool/http/Issue2531Test.java

@@ -2,6 +2,8 @@ package cn.hutool.http;
 
 import cn.hutool.core.lang.Console;
 import cn.hutool.core.map.MapUtil;
+import cn.hutool.core.net.url.UrlBuilder;
+import org.junit.Assert;
 import org.junit.Ignore;
 import org.junit.Test;
 
@@ -25,4 +27,19 @@ public class Issue2531Test {
 		final HttpResponse execute = request.execute();
 		Console.log(execute.body());
 	}
+
+	@Test
+	public void encodePlusTest(){
+		// 根据RFC3986规范，在URL中，"+"是安全字符，所以不会解码也不会编码
+		UrlBuilder builder = UrlBuilder.ofHttp("https://hutool.cn/a=+");
+		Assert.assertEquals("https://hutool.cn/a=+", builder.toString());
+
+		// 由于+为安全字符无需编码，ofHttp方法会把%2B解码为+，但是编码的时候不会编码
+		builder = UrlBuilder.ofHttp("https://hutool.cn/a=%2B");
+		Assert.assertEquals("https://hutool.cn/a=+", builder.toString());
+
+		// 如果你不想解码%2B，则charset传null表示不做解码，编码时候也被忽略
+		builder = UrlBuilder.ofHttp("https://hutool.cn/a=%2B", null);
+		Assert.assertEquals("https://hutool.cn/a=%2B", builder.toString());
+	}
 }