In -depth analysis of the technical principles of the FTP transmission framework in the Java class library
FTP (file transmission protocol) is a commonly used protocol for file transmission on computer networks.In the Java class library, there are many frameworks that can be used to achieve FTP transmission, such as Apache Commons Net and Spring Framework.This article will in -depth analysis of the technical principles of the FTP transmission framework in the Java class library and explain it through the Java code example.
1. Apache Commons Net：
Apache Commons Net is an open source Java class library that provides rich network protocol support, including FTP transmission.The FTP transmission is used to use the FTP transmission. The FTPClient class of Apache Commons Net is required.
First, you need to establish a connection with the FTP server.You can use the Connect () method of the FTPClient class to connect to the FTP server, such as::
FTPClient ftpClient = new FTPClient();
ftpClient.connect("ftp.example.com", 21);
After establishing a connection, you can use the login () method to verify the identity:
boolean success = ftpClient.login("username", "password");
After the connection is successful, various FTP operations can be performed, such as upload files, download files, and creating directory.The following is an example of uploading files:
File file = new File("local_file.txt");
InputStream inputStream = new FileInputStream(file);
boolean success = ftpClient.storeFile("remote_file.txt", inputStream);
inputStream.close();
2. Spring Framework：
Spring Framework is a lightweight Java development framework that provides support for FTP transmission.Using Spring Framework for FTP transmission, you can use the components in the org.springframework.integration.ftp package provided by it.
First, you need to configure a FTP to connect to the factory.You can configure the FTPS connection factory by using ORG.SpringFramework.Integration.ftP.Session.DefaultPSSSSESSIONFACTORY class, for example:::: for example::
DefaultFtpsSessionFactory ftpsSessionFactory = new DefaultFtpsSessionFactory();
ftpsSessionFactory.setHost("ftp.example.com");
ftpsSessionFactory.setPort(21);
ftpsSessionFactory.setUsername("username");
ftpsSessionFactory.setPassword("password");
FtpPersistentFileListFilter fileListFilter = new FtpPersistentFileListFilter(
new SimplePatternFileListFilter("*.txt"));
ftpsSessionFactory.setFileListFilter(fileListFilter);
You can then use ORG.SpringFramework.Integrating.ftp.outbound.ftpmessagehandler class to perform FTP operations.The following is an example of uploading files:
FtpMessageHandler handler = new FtpMessageHandler(ftpsSessionFactory);
File file = new File("local_file.txt");
byte[] fileData = FileUtils.readFileToByteArray(file);
Message<byte[]> message = MessageBuilder.withPayload(fileData)
.setHeader("remote_file", "remote_file.txt")
.build();
handler.handleMessage(message);
Summarize:
This article deeply analyzes the technical principles of the FTP transmission framework in the Java class library, and provides the example code of the Apache Commons Net and Spring Framework.Using these frameworks can easily implement the FTP file transmission function.It is hoped that this article can help readers better understand and apply the FTP transmission framework in the Java class library.
