Question

我的文件从服务器传输到客户端有问题。问题是，即使文件有多大，最后的字节也不会被传输。假设我想下载56kb的文件，然后我只收到35kb的例子。

我将为您提供一些代码片段，也许有人可以看到任何错误。

发件人：

public void sendFile(String fileName, Socket socket) {
    try {
        try {
            File transferFile = new File(fileName);
            byte[] bytearray = new byte[(int) transferFile.length()];
            FileInputStream fin = new FileInputStream(transferFile);
            BufferedInputStream bin = new BufferedInputStream(fin);
            OutputStream os = socket.getOutputStream();
            int bytesRead = 0;

            while (-1 != (bytesRead = bin.read(bytearray, 0, bytearray.length))) {
                os.write(bytearray, 0, bytesRead);
            }

            bin.close();
            os.flush();
            socket.close();
        } catch (IOException e) {
            System.out.println("error " + e);
        }
    } catch (Exception ex) {
        System.out.println("error " + ex);
    }
}

接收者：

public void downloadFile(Socket socket, String fName) {

    try {
        InputStream is = socket.getInputStream();

        FileOutputStream fos = new FileOutputStream(fName);
        BufferedOutputStream bos = new BufferedOutputStream(fos);

        int count;
        byte[] buffer = new byte[1024];

        while ((count = is.read(buffer)) != -1) {
            bos.write(buffer, 0, count);
        }

        bos.flush();
        bos.close();
    } catch (Exception e) {
        System.out.println("Error " + e);
    }
}

欢迎任何帮助，谢谢。

Answer 1

如果

char* fn = NULL;
SDL_Log("fn pre address is: %p\n",fn);
fn = get_resource("test.txt");
SDL_Log("fn pos address is: %p\n",fn);
//free(fn); <--this causes seg fault if I uncomment it

INFO: fn pre address is: 0x0
INFO: fn pre address is: 0x7fa882501a00
INFO: fn pos address is: 0x7fa882501a00

get_resource(const char* filename) {
    char* string = (char*)calloc(1, sizeof(strlen(res_dir) + strlen(filename)));
    //i also tried with strncpy
    //strncpy(string, res_dir, strlen(res_dir));
    //strncpy(string + strlen(res_dir), filename, strlen(filename));

    memcpy(string, "/usr/test/files", strlen(res_dir));
    memcpy(string + strlen("/usr/test/files"), filename, strlen(filename));
    string[strlen(filename) + strlen("/usr/test/files")] = '\0';
    return string;
}

返回零，

while ((count = is.read(buffer)) > 0)将中断循环。

但是，如果返回零，则不应假设已到达文件末尾，因为根据文档，零是一个完全有效的返回值。

你应该继续阅读，直到is.read()被退回。

此外，关闭-1后，您还应该关闭BufferedOutputStream bos。

Java套接字文件传输 - 不完整文件

1 个答案: