add new example for set x-qn-meta-* [ci skip]

Author: neikochan

examples/QNMetaDemo.java

@@ -0,0 +1,73 @@
+import com.qiniu.common.QiniuException;
+import com.qiniu.http.Client;
+import com.qiniu.http.Response;
+import com.qiniu.util.Auth;
+import com.qiniu.util.StringMap;
+import com.qiniu.util.UrlSafeBase64;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+public class QNMetaDemo {
+    //设置好账号的ACCESS_KEY和SECRET_KEY
+    private static final String ACCESS_KEY = "填写你们自己的AK";
+    private static final String SECRET_KEY = "填写你们自己的SK";
+    private static final Auth auth = Auth.create(ACCESS_KEY, SECRET_KEY);
+
+    private Client client = new Client();
+    private String bucketName;
+    private String rsHost;
+
+    {
+        bucketName = "填写你们自己的存储空间";
+        //设置存储区域rs域名，华东z0 华北z1 华南z2
+        rsHost = "rs-z2.qiniu.com";
+    }
+
+    public static void main(String[] args) throws Exception {
+        QNMetaDemo qnMetaDemo = new QNMetaDemo();
+        //需要设置自定义meta的空间文件名称
+        String key = "1.mp4";
+        //设置自定义的meta头部，注意，每次调用该接口，是直接覆盖meta，不是追加meta
+        HashMap<String, String> metaKeyVal = new HashMap<>();
+        metaKeyVal.put("eng1", "qiniu");
+        metaKeyVal.put("eng2", "七牛");
+        boolean result = qnMetaDemo.setMeta(qnMetaDemo.bucketName, key, metaKeyVal);
+        if(result){
+            System.out.println("done");
+        }
+    }
+
+    /**
+     * @param bucket  存储空间名称
+     * @param key     存储空间的文件名称
+     * @param headers 自定义的请求头 key - val map
+     * @return true or false
+     * @throws QiniuException
+     */
+    public boolean setMeta(String bucket, String key, Map<String, String> headers) throws QiniuException {
+        String resource = UrlSafeBase64.encodeToString(bucket.concat(":").concat(key));
+        String path = String.format("/setmeta/%s", resource);
+        String k;
+        String encodedMetaValue;
+        for(Iterator var6 = headers.keySet().iterator(); var6.hasNext(); path = String.format("%s/x-qn-meta-%s/%s", path, k, encodedMetaValue)) {
+            k = (String)var6.next();
+            encodedMetaValue = UrlSafeBase64.encodeToString((String)headers.get(k));
+        }
+        //接口请求地址
+        String url = String.format("https://%s%s", rsHost, path);
+        System.out.println(url);
+        Response res = this.post(url);
+        if (res.statusCode != 200) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    private Response post(String url) throws QiniuException {
+        StringMap headers = this.auth.authorization(url);
+        return this.client.post(url, null, headers, "application/x-www-form-urlencoded");
+    }
+}