feat: 新增使用注解注入SpringUtil的方式

hutool-extra/src/main/java/cn/hutool/extra/spring/EnableSpringUtil.java

@@ -0,0 +1,19 @@
+package cn.hutool.extra.spring;
+
+import org.springframework.context.annotation.Import;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * 启用SpringUtil, 即注入SpringUtil到容器中
+ *
+ * @author sidian
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Import(SpringUtil.class)
+public @interface EnableSpringUtil {
+}

hutool-extra/src/test/java/cn/hutool/extra/spring/EnableSprintUtilTest.java

@@ -0,0 +1,24 @@
+package cn.hutool.extra.spring;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+/**
+ * @author sidian
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = EnableSprintUtilTest.class)
+@EnableSpringUtil
+public class EnableSprintUtilTest {
+
+    @Test
+    public void test() {
+        // 使用@EnableSpringUtil注解后, 能获取上下文
+        Assert.assertNotNull(SpringUtil.getApplicationContext());
+        // 不使用时, 为null
+//        Assert.assertNull(SpringUtil.getApplicationContext());
+    }
+}