java - 如何修复线程“main”java.io.EOFException中的异常?(Java 套接字)
问题描述
我想使用 java 套接字创建一个简单的多文件传输程序。
服务器输出:
I am server The server is listening... Client are connected Files Selected : 2 README.txt vcruntime140.dll Server Closed!
客户端输出:
i am client Server are connected filecount : 2 filenames : README.txt
在 socket.client.main(client.java:32) 的 java.io.DataInputStream.readLong(Unknown Source) 的 java.io.DataInputStream.readFully(Unknown Source) 的线程“main”java.io.EOFException 中的异常
这是我的服务器代码!服务器是发件人。
public static void main(String[] args) throws Exception {
System.out.println("i am server");
System.out.println("");
server = new ServerSocket(12345);
System.out.println("Server is listening...");
client = server.accept();
System.out.println("Client are connected");
dos = new DataOutputStream(client.getOutputStream());
dir = "C:\\Users\\Nitesh Rathi\\Downloads\\vcruntime140";
files = new File(dir).listFiles();
System.out.println("Files Selected : " + files.length);
dos.writeInt(files.length);
byte[] b = new byte[4096];
for (File file : files)
{
long length = file.length();
dos.writeLong(length);
String filename = file.getName();
dos.writeUTF(filename);
System.out.println(file.getName());
fis = new FileInputStream(file);
while (fis.read(b) != -1)
{
fis.read(b, 0, b.length);
dos.write(b, 0, b.length);
}
}
System.out.println("");
fis.close();
client.close();
server.close();
System.out.println("Server Closed!");
}
这是我的客户代码!客户是接收者。
public static void main(String[] args) throws Exception {
System.out.println("i am client");
System.out.println("");
soc = new Socket("localhost", 12345);
System.out.println("Server are connected");
dis = new DataInputStream(soc.getInputStream());
int filecount = dis.readInt();
File[] files = new File[filecount];
System.out.println("filecount : " + filecount);
byte[] b = new byte[1024];
for (int i=0;i<filecount;i++)
{
long filelength = dis.readLong();
String filename = dis.readUTF();
System.out.println("filenames : "+filename);
files[i] = new File(dirPath + "/" + filename);
fos = new FileOutputStream(files[i]);
for(int j = 0; j < filelength; j++)
{
fos.write(b);
dis.read(b);
}
}
System.out.println("data received!");
fos.flush();
fos.close();
soc.close();
System.out.println("client closed!");
}
我希望客户端的这个输出:文件计数:2 文件名:README.txt vcruntime140.dll
解决方案
在服务器端,您在fis.read()
从输入文件流读取时每次循环迭代调用两次。每次迭代只需要调用一次,并且需要传递 to 的返回值,fis.read()
以便dos.write()
它知道要写入的正确字节数。
在客户端,在读取文件流时,您是在调用填充数据fos.write()
之前调用的。而且您循环了太多次,因为您没有使用每次迭代实际读取的字节数来更新循环计数器。dis.read()
b
j
尝试更多类似的东西:
服务器:
public static void main(String[] args) throws Exception
{
System.out.println("i am server");
System.out.println("");
ServerSocket server = new ServerSocket(12345);
System.out.println("Server is listening...");
Socket client = server.accept();
System.out.println("Client is connected");
DataOutputStream dos = new DataOutputStream(client.getOutputStream());
String dir = "C:\\Users\\Nitesh Rathi\\Downloads\\vcruntime140";
Files[] files = new File(dir).listFiles();
System.out.println("Files Selected : " + files.length);
dos.writeInt(files.length);
byte[] b = new byte[4096];
for (File file : files)
{
long filelength = file.length();
dos.writeLong(filelength);
String filename = file.getName();
dos.writeUTF(filename);
System.out.println(filename);
FileInputStream fis = new FileInputStream(file);
DataInputStream dis = DataInputStream(fis);
int loops = (int) (filelength / (long) b.length);
int remainder = (int) (filelength % (long) b.length);
for (int j = 0; j < loops; j++)
{
dis.readFully(b);
dos.write(b);
}
if (remainder > 0)
{
dis.readFully(b, 0, remainder);
dos.write(b, 0, remainder);
}
}
System.out.println("");
dos.close();
server.close();
System.out.println("Server Closed!");
}
客户:
public static void main(String[] args) throws Exception
{
System.out.println("i am client");
System.out.println("");
Socket soc = new Socket("localhost", 12345);
System.out.println("Server is connected");
DataInputStream dis = new DataInputStream(soc.getInputStream());
int filecount = dis.readInt();
File[] files = new File[filecount];
System.out.println("filecount : " + filecount);
byte[] b = new byte[1024];
for (int i = 0; i < filecount; i++)
{
long filelength = dis.readLong();
String filename = dis.readUTF();
System.out.println("filename : " + filename);
files[i] = new File(dirPath + "/" + filename);
FileOutputStream fos = new FileOutputStream(files[i]);
int loops = (int) (filelength / (long) b.length);
int remainder = (int) (filelength % (long) b.length);
for (int j = 0; j < loops; j++)
{
dis.readFully(b);
fos.write(b);
}
if (remainder > 0)
{
dis.readFully(b, 0, remainder);
fos.write(b, 0, remainder);
}
}
System.out.println("data received!");
dis.close();
System.out.println("client closed!");
}
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