fix method call mistake in ContentCachingInputStream read methods

Author: zilong6

spring-web/src/main/java/org/springframework/web/util/ContentCachingRequestWrapper.java

@@ -215,43 +215,31 @@ public ContentCachingInputStream(ServletInputStream is) {
 
 		@Override
 		public int readLine(final byte[] b, final int off, final int len) throws IOException {
-			int count = super.readLine(b, off, len);
-			if (!this.overflow && count > 0) {
-				if (contentCacheLimit != null && cachedContent.size() == contentCacheLimit) {
+			int count = is.readLine(b, off, len);
+			cache(b, off, count);
+			return count;
+		}
+
+		private void cache(final byte[] b, final int off, final int count) {
+			if (contentCacheLimit != null && cachedContent.size() == contentCacheLimit) {
+				this.overflow = true;
+				handleContentOverflow(contentCacheLimit);
+			} else {
+				int sizeToCache = contentCacheLimit == null || count + cachedContent.size() < contentCacheLimit
+						? count
+						: contentCacheLimit - cachedContent.size();
+				cachedContent.write(b, off, sizeToCache);
+				if (sizeToCache < count) {
 					this.overflow = true;
 					handleContentOverflow(contentCacheLimit);
-				} else {
-					int sizeToCache = contentCacheLimit == null || count + cachedContent.size() < contentCacheLimit
-							? count
-							: contentCacheLimit - cachedContent.size();
-					cachedContent.write(b, 0, sizeToCache);
-					if (sizeToCache < count) {
-						this.overflow = true;
-						handleContentOverflow(contentCacheLimit);
-					}
 				}
 			}
-			return count;
 		}
 
 		@Override
 		public int read(final byte[] b, final int off, final int len) throws IOException {
-			int count = super.read(b, off, len);
-			if (!this.overflow && count > 0) {
-				if (contentCacheLimit != null && cachedContent.size() == contentCacheLimit) {
-					this.overflow = true;
-					handleContentOverflow(contentCacheLimit);
-				} else {
-					int sizeToCache = contentCacheLimit == null || count + cachedContent.size() < contentCacheLimit
-							? count
-							: contentCacheLimit - cachedContent.size();
-					cachedContent.write(b, off, sizeToCache);
-					if (sizeToCache < count) {
-						this.overflow = true;
-						handleContentOverflow(contentCacheLimit);
-					}
-				}
-			}
+			int count = is.read(b, off, len);
+			cache(b, off, count);
 			return count;
 		}