diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/download/java/JavaDownloadTask.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/download/java/JavaDownloadTask.java
index 7c35f9375..a83eb0cdc 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/download/java/JavaDownloadTask.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/download/java/JavaDownloadTask.java
@@ -25,6 +25,7 @@ import org.jackhuang.hmcl.task.FileDownloadTask;
 import org.jackhuang.hmcl.task.GetTask;
 import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.util.gson.JsonUtils;
+import org.jackhuang.hmcl.util.io.ChecksumMismatchException;
 import org.jackhuang.hmcl.util.io.FileUtils;
 import org.jackhuang.hmcl.util.io.NetworkUtils;
 import org.jackhuang.hmcl.util.platform.OperatingSystem;
@@ -37,9 +38,13 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.attribute.BasicFileAttributes;
 import java.util.*;
 import java.util.stream.Collectors;
 
+import static org.jackhuang.hmcl.util.Logging.LOG;
+
 public class JavaDownloadTask extends Task<Void> {
     private final GameJavaVersion javaVersion;
     private final Path rootDir;
@@ -47,10 +52,12 @@ public class JavaDownloadTask extends Task<Void> {
     private final Task<RemoteFiles> javaDownloadsTask;
     private JavaDownloads.JavaDownload download;
     private final List<Task<?>> dependencies = new ArrayList<>();
+    private final DownloadProvider downloadProvider;
 
     public JavaDownloadTask(GameJavaVersion javaVersion, Path rootDir, DownloadProvider downloadProvider) {
         this.javaVersion = javaVersion;
         this.rootDir = rootDir;
+        this.downloadProvider = downloadProvider;
         this.javaDownloadsTask = new GetTask(NetworkUtils.toURL(downloadProvider.injectURL(
                 "https://piston-meta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json")))
         .thenComposeAsync(javaDownloadsJson -> {
@@ -62,7 +69,7 @@ public class JavaDownloadTask extends Task<Void> {
             for (JavaDownloads.JavaDownload download : candidates) {
                 if (VersionNumber.VERSION_COMPARATOR.compare(download.getVersion().getName(), Integer.toString(javaVersion.getMajorVersion())) >= 0) {
                     this.download = download;
-                    return new GetTask(NetworkUtils.toURL(download.getManifest().getUrl()));
+                    return new GetTask(NetworkUtils.toURL(downloadProvider.injectURL(download.getManifest().getUrl())));
                 }
             }
             throw new UnsupportedPlatformException();
@@ -92,14 +99,29 @@ public class JavaDownloadTask extends Task<Void> {
             Path dest = jvmDir.resolve(entry.getKey());
             if (entry.getValue() instanceof RemoteFiles.RemoteFile) {
                 RemoteFiles.RemoteFile file = ((RemoteFiles.RemoteFile) entry.getValue());
+
+                // Use local file if it already exists
+                try {
+                    BasicFileAttributes localFileAttributes = Files.readAttributes(dest, BasicFileAttributes.class);
+                    if (localFileAttributes.isRegularFile() && file.getDownloads().containsKey("raw")) {
+                        DownloadInfo downloadInfo = file.getDownloads().get("raw");
+                        if (localFileAttributes.size() == downloadInfo.getSize()) {
+                            ChecksumMismatchException.verifyChecksum(dest, "SHA-1", downloadInfo.getSha1());
+                            LOG.info("Skip existing file: " + dest);
+                            continue;
+                        }
+                    }
+                } catch (IOException ignored) {
+                }
+
                 if (file.getDownloads().containsKey("lzma")) {
                     DownloadInfo download = file.getDownloads().get("lzma");
                     File tempFile = jvmDir.resolve(entry.getKey() + ".lzma").toFile();
-                    FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(download.getUrl()), tempFile, new FileDownloadTask.IntegrityCheck("SHA-1", download.getSha1()));
+                    FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(downloadProvider.injectURL(download.getUrl())), tempFile, new FileDownloadTask.IntegrityCheck("SHA-1", download.getSha1()));
                     task.setName(entry.getKey());
                     dependencies.add(task.thenRunAsync(() -> {
                         try (LZMAInputStream input = new LZMAInputStream(new FileInputStream(tempFile))) {
-                            Files.copy(input, dest);
+                            Files.copy(input, dest, StandardCopyOption.REPLACE_EXISTING);
                         } catch (IOException e) {
                             throw new ArtifactMalformedException("File " + entry.getKey() + " is malformed", e);
                         }
@@ -110,7 +132,7 @@ public class JavaDownloadTask extends Task<Void> {
                     }));
                 } else if (file.getDownloads().containsKey("raw")) {
                     DownloadInfo download = file.getDownloads().get("raw");
-                    FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(download.getUrl()), dest.toFile(), new FileDownloadTask.IntegrityCheck("SHA-1", download.getSha1()));
+                    FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(downloadProvider.injectURL(download.getUrl())), dest.toFile(), new FileDownloadTask.IntegrityCheck("SHA-1", download.getSha1()));
                     task.setName(entry.getKey());
                     if (file.isExecutable()) {
                         dependencies.add(task.thenRunAsync(() -> dest.toFile().setExecutable(true)));