int port = Integer.parseInt(args[1])//e\第二个输进来的是端口号
这两个就是接收参数
import java.io.*import java.net.*public class ftpServer extends Thread{ public static void main(String args[]){
String initDir
initDir = "D:/Ftp"
ServerSocket server
Socket socket
String s
String user
String password
user = "root"
password = "123456"
try{
System.out.println("MYFTP服务器启动....")
System.out.println("正在等待连接....")
//监听21号端口
server = new ServerSocket(21)
socket = server.accept()
System.out.println("连接成功")
System.out.println("**********************************")
System.out.println("")
InputStream in =socket.getInputStream()
OutputStream out = socket.getOutputStream()
DataInputStream din = new DataInputStream(in)
DataOutputStream dout=new DataOutputStream(out)
System.out.println("请等待验证客户信息....")
while(true){
s = din.readUTF()
if(s.trim().equals("LOGIN "+user)){
s = "请输入密码:"
dout.writeUTF(s)
s = din.readUTF()
if(s.trim().equals(password)){
s = "连接成功。"
dout.writeUTF(s)
break
}
else{s ="密码错误，请重新输入用户名："<br> dout.writeUTF(s)<br> <br> }
}
else{
s = "您输入的命令不正确或此用户不存在，请重新输入："
dout.writeUTF(s)
}
}
System.out.println("验证客户信息完毕....")while(true){
System.out.println("")
System.out.println("")
s = din.readUTF()
if(s.trim().equals("DIR")){
String output = ""
File file = new File(initDir)
String[] dirStructure = new String[10]
dirStructure= file.list()
for(int i=0i<dirStructure.lengthi++){
output +=dirStructure[i]+"\n"
}
s=output
dout.writeUTF(s)
}
else if(s.startsWith("GET")){
s = s.substring(3)
s = s.trim()
File file = new File(initDir)
String[] dirStructure = new String[10]
dirStructure= file.list()
String e= s
int i=0
s ="不存在"
while(true){
if(e.equals(dirStructure[i])){
s="存在"
dout.writeUTF(s)
RandomAccessFile outFile = new RandomAccessFile(initDir+"/"+e,"r")
byte byteBuffer[]= new byte[1024]
int amount
while((amount = outFile.read(byteBuffer)) != -1){
dout.write(byteBuffer, 0, amount)break
}break
}
else if(i<dirStructure.length-1){
i++
}
else{
dout.writeUTF(s)
break
}
}
}
else if(s.startsWith("PUT")){
s = s.substring(3)
s = s.trim()
RandomAccessFile inFile = new RandomAccessFile(initDir+"/"+s,"rw")
byte byteBuffer[] = new byte[1024]
int amount
while((amount =din.read(byteBuffer) )!= -1){
inFile.write(byteBuffer, 0, amount)break
}
}
else if(s.trim().equals("BYE"))break
else{
s = "您输入的命令不正确或此用户不存在，请重新输入："
dout.writeUTF(s)
}
}
din.close()
dout.close()
in.close()
out.close()
socket.close()
}
catch(Exception e){
System.out.println("MYFTP关闭!"+e)
}
}}
