Filesystem 增加url方法 获取文件访问地址

src/think/filesystem/Driver.php

@@ -17,6 +17,7 @@
 use League\Flysystem\Cached\CachedAdapter;
 use League\Flysystem\Cached\Storage\Memory as MemoryStore;
 use League\Flysystem\Filesystem;
+use RuntimeException;
 use think\Cache;
 use think\File;
 
@@ -91,6 +92,16 @@ public function path(string $path): string
         return $path;
     }
 
+    protected function concatPathToUrl($url, $path)
+    {
+        return rtrim($url, '/') . '/' . ltrim($path, '/');
+    }
+
+    public function url(string $path): string
+    {
+        throw new RuntimeException('This driver does not support retrieving URLs.');
+    }
+
     /**
      * 保存文件
      * @param string               $path    路径

src/think/filesystem/driver/Local.php

@@ -41,4 +41,12 @@ protected function createAdapter(): AdapterInterface
             $permissions
         );
     }
+
+    public function url(string $path): string
+    {
+        if (isset($this->config['url'])) {
+            return $this->concatPathToUrl($this->config['url'], $path);
+        }
+        return parent::url($path);
+    }
 }