Update 2019-06-09-springboot读取classpath文件踩坑两则.md

_posts/2019-06-09-springboot读取classpath文件踩坑两则.md

@@ -40,4 +40,21 @@ for (Resource resource : resources) {
     Class<?> clz = ClassUtils.forName(reader.getClassMetadata().getClassName(), loader);
 }
 {% endhighlight %}
-参考[springboot源码](https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/liquibase/SpringPackageScanClassResolver.java)
+参考[springboot源码](https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/liquibase/SpringPackageScanClassResolver.java)
+
+--- 
+
+## 2024-04-23 update 
+上述方法只能获取lib中的package下的class, 如果项目本体中有包名相同的则无法获取. (PS. 如果包名相同类目也相同, 本体的class会覆盖lib中的, 这个特性有时候很有用) 
+
+{% highlight java %}
+// Guava 获取所有class 找特定package下的class
+Set<? extends Class<?>> collect = ClassPath.from(ClassLoader.getSystemClassLoader())
+      .getAllClasses()
+      .stream()
+      .filter(clazz -> clazz.getPackageName()
+        .equalsIgnoreCase(packageName))
+      .map(clazz -> clazz.load())
+      .collect(Collectors.toSet());
+// 有时候有需求将class实例化, 但有些class是抽象类等无法被实例化的类, 挨个儿做好try catch即可
+{% highlight java %}