fix code

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

@@ -20,6 +20,8 @@ import java.util.Map;
  * <pre>
  *   key1=v1&amp;key2=&amp;key3=v3
  * </pre>
+ * 查询封装分为解析查询字符串和构建查询字符串，解析可通过charset为null来自定义是否decode编码后的内容，<br>
+ * 构建则通过charset是否为null是否encode参数键值对
  *
  * @author looly
  * @since 5.3.1

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

@@ -130,4 +130,11 @@ public class UrlQueryTest {
 		final String a = UrlQuery.of(MapUtil.of("a ", " ")).build(CharsetUtil.CHARSET_UTF_8);
 		Assert.assertEquals("a%20=%20", a);
 	}
+
+	@Test
+	public void parsePercentTest(){
+		String queryStr = "a%2B=ccc";
+		final UrlQuery query = UrlQuery.of(queryStr, null);
+		Assert.assertEquals(queryStr, query.toString());
+	}
 }