java - 下载的jar文件损坏

Question

我有这段代码，可以从特定 URL 下载 .jar 文件并将其放入特定文件夹中。下载的 jar 文件是游戏的 mod，这意味着它必须下载并正确运行而不被损坏。

问题是，每次我尝试下载该文件时，它最终都会以某种方式损坏并在加载时导致错误。

这是我的下载代码:

final static int size=1024;

public static void downloadFile(String fAddress, String localFileName, String destinationDir, String modID) {
    OutputStream outStream = null;
    URLConnection  uCon = null;

    InputStream is = null;
    try {
        URL Url;
        byte[] buf;
        int ByteRead,ByteWritten=0;
        Url= new URL(fAddress);
        outStream = new BufferedOutputStream(new
                FileOutputStream(destinationDir+"/"+localFileName));

        uCon = Url.openConnection();
        is = uCon.getInputStream();
        buf = new byte[size];
        while ((ByteRead = is.read(buf)) != -1) {
            outStream.write(buf, 0, ByteRead);
            ByteWritten += ByteRead;
        }
        System.out.println("Downloaded Successfully.");
        System.out.println("File name:\""+localFileName+ "\"\nNo ofbytes :" + ByteWritten);
        System.out.println("Writing info file");
        WriteInfo.createInfoFile(localFileName, modID);
    }catch (Exception e) {
        e.printStackTrace();
    }
    finally {
        try {
            is.close();
            outStream.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}

你知道这段代码有什么问题吗？

Answer 1

不确定这是否能解决您的问题，但您应该在最后刷新缓冲区。

outStream.flush();