每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现-each sent a Ftp, Ftp server will return a string, including a return code and a bunch stated. The return code is mainly used to judge whether the order was successfully implemented. In addition, there is a very important order for the return. When sending PASV, return to the "227 Entering Passive Mode (127,0,0,1,4. 18). " This means that the server is a port being open, we will be behind him then transfer the data to prepare But we know how to do the port, the (127,0,0,1,4,18), four previous addresses refer to the server, the key was the last two, the final will take second place on 256 with a final value is our port, which is 4 * 256 18. Port made after we socket connections can be used to here. This behind us prepare for the work, because we made the list and upload and downloa 下载
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每一个Ftp发送之后，Ftp服务器都会返回一个字符串，其中包括一个返回代码和一串说明信息。这个返回码主要是用于判断命令是否被成功执行了。除此之外，还有一个非常重要的命令的返回。当发送PASV之后，返回“227 Entering Passive Mode (127,0,0,1,4,18)”。这意味着在服务器上有一个端口被开放，他将为我们后面接着的数据传输作好准备，但是我们如何知道该端口号呢，就在(127,0,0,1,4,18)中，前面四位指服务器的地址，关键是最后两位，将最后第二位乘256再加上最后一位的值就是我们的端口号，也就是4*256+18。取得端口号之后我们就可以用socket连接到这里。这为我们后面的工作作好准备了，因为我们的取得列表，上传，下载文件都要依靠它来实现- 下载
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