update head obj Demo

Author: jeffreykzli

src/main/java/com/qcloud/cos/demo/GetObjectMetadataDemo.java

@@ -13,7 +13,6 @@ public static void main(String[] args) {
         getObjectMetadataDemo();
     }
 
-    // 将本地文件上传到COS
     private static void getObjectMetadataDemo() {
         // 1 初始化用户身份信息(secretId, secretKey)
         COSCredentials cred = new BasicCOSCredentials("AKIDXXXXXXXX", "1A2Z3YYYYYYYYYY");

src/main/java/com/qcloud/cos/demo/HeadObjectDemo.java

@@ -0,0 +1,30 @@
+package com.qcloud.cos.demo;
+
+import com.qcloud.cos.COSClient;
+import com.qcloud.cos.ClientConfig;
+import com.qcloud.cos.auth.BasicCOSCredentials;
+import com.qcloud.cos.auth.COSCredentials;
+import com.qcloud.cos.region.Region;
+
+public class HeadObjectDemo {
+    public static void main(String[] args) {
+        headObject();
+    }
+
+    private static void headObject() {
+        // 1 初始化用户身份信息(secretId, secretKey)
+        COSCredentials cred = new BasicCOSCredentials("AKIDXXXXXXXX", "1A2Z3YYYYYYYYYY");
+        // 2 设置bucket的区域, COS地域的简称请参照 https://www.qcloud.com/document/product/436/6224
+        ClientConfig clientConfig = new ClientConfig(new Region("ap-beijing-1"));
+        // 3 生成cos客户端
+        COSClient cosclient = new COSClient(cred, clientConfig);
+        // bucket名需包含appid
+        String bucketName = "mybucket-12500000000";
+
+        String key = "aaa/bbb.txt";
+        boolean is_exist = cosclient.doesObjectExist(bucketName, key);
+        System.out.println(is_exist);
+        // 关闭客户端
+        cosclient.shutdown();
+    }
+}