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我有以下代码上传文件从客户端到服务器TCP,但是当我尝试打开手动文件是空的为什么好的重量.. 我看了很多帖子stackOverflow但没有任何改变 THX (对不起我的英文不好)
服务器:BufferedOuputStream使空白文件
ThreadServer扩展公共Thread类{
private Socket soc;
private FileOutputStream fos;
private BufferedOutputStream bos;
private InputStream in;
public ThreadServer (Socket soc) {
this.soc = soc;
}
public void run(){
try {
fos = new FileOutputStream("C:/Users/erwan/workspace/Word/server/text.txt");
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
bos = new BufferedOutputStream(fos);
byte[] buffer = new byte[1024];
try {
in = soc.getInputStream();
int count = 0;
while((count= in.read(buffer, 0 , buffer.length)) != -1) {
System.out.println(count+" octets received...");
bos.write(buffer);
}
bos.flush();
bos.close();
in.close();
soc.close();
System.out.println("File sent succesfully!");
}catch(IOException e){
e.printStackTrace();
System.out.println("Une erreur est survenu");
}
}
}
客户端:
public class Client {
private static Socket as;
private static FileInputStream fis;
private static BufferedInputStream bis;
private static OutputStream out;
public static void main(String[] args){
as = null;
try{
as = new Socket(InetAddress.getLocalHost(),4020);
File f = new File (args[0]);
byte [] buffer = new byte [(int) f.length()];
fis = new FileInputStream(f);
setBis(new BufferedInputStream(fis));
out = as.getOutputStream();
System.out.println("uploading...");
out.write(buffer,0,buffer.length);
out.flush();
out.close();
System.out.println("the file is uploaded.");
as.close();
}catch(IOException e){
e.printStackTrace();
}
}
我真的不明白为什么fis.read(buffer,0,buffer.lenght)解决了这个问题,但真的非常感谢你回答:)如果你能再次解释我的dos是如何工作的? thx –
是的。这并不复杂。你做了一个新的字节[(int)f.length()]。所做的是分配一个存储区域来存储f.length()字节。它不会将任何数据放入这些内存字节中。在大多数情况下,数组将被jvm初始化为0个字节(二进制零,因此经常在编辑器中显示为奇怪的字符)。为了将您的输入文件中的数据动态地放入新创建的数组中,您需要执行fis.read。 –