JSONConfig增加setWriteLongAsString可选是否将Long写出为String类型

hutool-json/src/test/java/cn/hutool/json/Issue3541Test.java

@@ -0,0 +1,22 @@
+package cn.hutool.json;
+
+import lombok.Data;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class Issue3541Test {
+	@Test
+	public void longToStringTest() {
+		Demo demo = new Demo();
+		demo.setId(1227690722069581409L);
+		demo.setName("hutool");
+		String jsonStr = JSONUtil.toJsonStr(demo, JSONConfig.create().setWriteLongAsString(true));
+		Assert.assertEquals("{\"id\":\"1227690722069581409\",\"name\":\"hutool\"}", jsonStr);
+	}
+
+	@Data
+	public static class Demo {
+		private Long id;
+		private String name;
+	}
+}