mohsenk · September 9, 2015 09:31 · Feb 9, 2012 · Feb 9, 2012
diff --git a/Application.java b/Application.java
@@ -1,4 +1,4 @@
-public static void getUserFile(final Long fileId) throws IOException {
+public static void downloadFile(final Long fileId) throws IOException {
         response.setHeader("Accept-Ranges", "bytes");
         notFoundIfNull(fileId);
 

diff --git a/Application.java b/Application.java
@@ -0,0 +1,16 @@
+public static void getUserFile(final Long fileId) throws IOException {
+        response.setHeader("Accept-Ranges", "bytes");
+        notFoundIfNull(fileId);
+
+        File underlyingFile = ... //load file
+        String fileName = ...//name of the file
+
+        Header rangeHeader = request.headers.get("range");
+        if (rangeHeader != null) {
+            throw new PartialContent(underlyingFile, fileName);
+        } else {
+            renderBinary(new FileInputStream(underlyingFile),
+                         fileName, underlyingFile.length(),
+                         MimeTypes.getContentType(fileName), false);
+        }
+}
diff --git a/PartialContent.java b/PartialContent.java
@@ -0,0 +1,61 @@
+import java.io.File;
+import java.io.RandomAccessFile;
+
+import org.jboss.netty.handler.stream.ChunkedFile;
+
+import play.Logger;
+import play.exceptions.UnexpectedException;
+import play.libs.MimeTypes;
+import play.mvc.Http.Header;
+import play.mvc.Http.Request;
+import play.mvc.Http.Response;
+import play.mvc.results.Result;
+
+public class PartialContent extends Result {
+
+    private final File file;
+    private final String fileName;
+
+    public PartialContent(final File file, final String fileName) {
+        this.file = file;
+        this.fileName = fileName;
+    }
+
+    @Override
+    public void apply(final Request request, final Response response) {
+        try {
+            response.status = 206;
+            Header rangeHeader = request.headers.get("range");
+            String rangeValue = rangeHeader.value().trim()
+                    .substring("bytes=".length());
+            long fileLength = this.file.length();
+            long start, end;
+            if (rangeValue.startsWith("-")) {
+                end = fileLength - 1;
+                start = fileLength - 1
+                        - Long.parseLong(rangeValue.substring("-".length()));
+            } else {
+                String[] range = rangeValue.split("-");
+                start = Long.parseLong(range[0]);
+                end = range.length > 1 ? Long.parseLong(range[1])
+                        : fileLength - 1;
+            }
+            if (end > fileLength - 1) {
+                end = fileLength - 1;
+            }
+            if (start <= end) {
+                long contentLength = end - start + 1;
+                response.setHeader("Content-Length", contentLength + "");
+                response.setHeader("Content-Range", "bytes " + start + "-"
+                        + end + "/" + fileLength);
+                response.setHeader("Content-Type",
+                        MimeTypes.getContentType(this.fileName));
+                RandomAccessFile raf = new RandomAccessFile(this.file, "r");
+                response.direct = new ChunkedFile(raf, start, contentLength,
+                        8192);
+            }
+        } catch (Exception e) {
+            throw new UnexpectedException(e);
+        }
+    }
+}