Java读取FTP上TXT文件内容

分手后的思念是犯贱 2024-04-17 16:26 62阅读 0赞

**1.pom.xml添加连接FTP依赖包**

<dependency>
        <groupId>commons-net</groupId>
        <artifactId>commons-net</artifactId>
    	<version>3.1</version>
    </dependency>

**2.测试读取文件**

import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.net.SocketException;
    import java.text.SimpleDateFormat;
    
    import org.apache.commons.net.ftp.FTPClient;
    import org.apache.commons.net.ftp.FTPFile;
    
    public class Test {
    
    	public static void main(String[] args) throws Exception {
    	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	    FTPClient ftpClient = FtpUtil.connectFTP("127.0.0.1", 21, "123456", "123456");
    	    FTPFile[] ftpFiles = ftpClient.listFiles();
                for (FTPFile ftpFile : ftpFiles) {	
            	String fileName = ftpFile.getName();//获取文件名
            	String suffix = fileName.substring(fileName.lastIndexOf(".")).toLowerCase();//后缀名
                    //ftp设置的是utc时间,和系统时间有8小时时差,所以需要加上时差
                    Long lastModifiedTime = ftpFile.getTimestamp().getTimeInMillis() + ftpFile.getTimestamp().getTimeZone().getOffset(0);        	
                    System.out.println("读取到文件："+fileName+" 文件最后修改时间："+sdf.format(lastModifiedTime));
    		if(suffix.equals(".txt")){
    	            InputStream is = ftpClient.retrieveFileStream(ftpFile.getName());
    		    BufferedReader br = new BufferedReader(new InputStreamReader(is,"UTF-8"));
    		    String content = "";
                        while ((content = br.readLine()) != null){ //一次读入一行数据
                	        System.out.println(content); 
                        }
                        br.close();
                        is.close();
                        //结束事务(有流返回时需手动调用,否则会报输入流为空)
                        ftpClient.completePendingCommand();
    		}
                }
            }
    	
            /**
             * 连接FTP
             * @param hostname 服务器地址
             * @param port 端口号(默认为21)
             * @param username 帐号
             * @param password 密码
             */
    	public static FTPClient connectFTP(String hostname, int port, String username, String password){
    	    FTPClient ftp = new FTPClient();   
    	    try {
    		//连接FTP服务器
    		ftp.connect(hostname, port);
    		boolean login = ftp.login(username, password);
                    if (login) {
                        System.out.println(">>>>>>>>FTP-->登录成功>>>>>>>>>>>>>");
                    }else {
                        System.out.println(">>>>>>>>FTP-->登录失败>>>>>>>>>>>>>");
                    }
    	    } catch (SocketException e) {
    		e.printStackTrace();
    	    } catch (IOException e) {
    		e.printStackTrace();
    	    }
    	    return ftp;
    	}
    }