TCP实现局域网文件传输细节

         续上次讲过UDP传输文件,这次简要讲下关于TCP文件传输的发送端与接收端.tcp传输主要关键地方就是文件末尾的处理

        发送端代码:

  

private void sendFile(File f) throws Exception {
            oos.writeUnshared(f);
            oos.writeLong(f.length());
            FileInputStream fins = new FileInputStream(f);
            byte[] buf = new byte[8192];
            int size = 0;
            while ((size = fins.read(buf)) != -1) {
                oos.write(buf, 0, size);
            }
            System.out.println("发送方发送文件:" + f + " 完毕");
            oos.flush();
            fins.close();
        }

 

 

接收端代码:

  

 /**
     * 处理对方发过来的文件
     */
    private void doReceiveFile(String savePath) throws Exception {
        File f = (File) ois.readUnshared();//文件
        long len = ois.readLong();
        System.out.println("接收方  收到发送方的文件:" + f + "  文件大小:" + len);
        File file = new File(savePath, f.getName());
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        BufferedOutputStream fous = new BufferedOutputStream(new FileOutputStream(file));
        byte[] buffer = new byte[8192];
        int lengths = -1;//实现每次接收到的数组长度
        int accepts = 0;//当前已经传的文件长度
        int canRead = (int) (len - accepts - 8192 < 0 ? len - accepts : 8192);//处理文件末尾
        while ((lengths = ois.read(buffer, 0, canRead)) > 0) {
            fous.write(buffer, 0, lengths);
            accepts += lengths;
            canRead = (int) (len - accepts - 8192 < 0 ? len - accepts : 8192);
        }
        fous.close();
        System.out.println("接收方接收文件完毕");

    }