修复图片Key缓存冷启动并关闭异常HTTP响应

src/main/java/com/lion/lionwebsite/Util/GalleryUtil.java

@@ -194,10 +194,13 @@ public class GalleryUtil {
 
     public static String getMpvKey(String url){
         String gid = String.valueOf(parseGid(url));
-        return gid2MpvKey.computeIfAbsent(gid, k -> {
+        String key = gid2MpvKey.get(gid);
+        if (key == null) {
+            // refreshMpvKey writes the cache itself; never call it inside computeIfAbsent.
             refreshMpvKey(url);
-            return gid2MpvKey.get(k);
-        });
+            key = gid2MpvKey.get(gid);
+        }
+        return key;
     }
 
     public static void refreshMpvKey(String url)  {
@@ -210,7 +213,7 @@ public class GalleryUtil {
              content = requests(mpvUrl, "get", header, null);
         }catch (Exception e){
             log.error("刷新mpvKey失败, url: {}", url, e);
-            gid2MpvKey.put(parseGid(url) + "", null);
+            gid2MpvKey.remove(parseGid(url) + "");
             return;
         }
         Document document = Jsoup.parse(content);
@@ -343,22 +346,21 @@ public class GalleryUtil {
             }
             httpResponse = httpClient.execute(httpPost);
         }
-        HttpEntity responseEntity = httpResponse.getEntity();
-        int statusCode = httpResponse.getStatusLine().getStatusCode();
-        StringBuilder stringBuilder = new StringBuilder();
-
-        if(statusCode == 200){
-            BufferedReader reader = new BufferedReader(new InputStreamReader(responseEntity.getContent()));
-            String str;
-            while((str = reader.readLine()) != null)
-                stringBuilder.append(str).append("\n");
-        } else{
-            log.warn("{}:{}", url, statusCode);
+        try (httpResponse) {
+            HttpEntity responseEntity = httpResponse.getEntity();
+            int statusCode = httpResponse.getStatusLine().getStatusCode();
+            StringBuilder stringBuilder = new StringBuilder();
+            if (statusCode == 200 && responseEntity != null) {
+                try (BufferedReader reader = new BufferedReader(new InputStreamReader(responseEntity.getContent()))) {
+                    String str;
+                    while ((str = reader.readLine()) != null)
+                        stringBuilder.append(str).append("\n");
+                }
+            } else {
+                log.warn("{}:{}", url, statusCode);
+            }
+            return stringBuilder.toString();
         }
-
-        httpResponse.close();
-
-        return stringBuilder.toString();
     }
 
     public static Integer parseGid(String link){