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java操作FTP的一些工具方法

java操作FTP还是很方便的,有多种开源支持,这里在apache开源的基础上自己进行了一些设计,使用起来更顺手和快捷。

思路:

  1.设计FTPHandler接口,可以对ftp,sftp进行统一操作,比如上传,下载,删除,获取关闭连接等

  2.对FTP和SFTP的实现

  3.设计一个工厂(考虑以后可能有sftp,ftp两种,目前只实现一种FTP的),用来生成FTPHandler

  4.简单使用说明

作为码农,上代码更实在。

接口 FTPHandler.java

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;

import org.apache.commons.net.ftp.FTPClient;

public interface FTPHandler {
    /**
     * 获取连接
     * @return
     * @throws SocketException
     * @throws IOException
     */
    public boolean connect() throws SocketException, IOException;
    /**
     * 上传文件
     * @param remotePath 要保存到的远程ftp目录
     * @param originalFilename 要保存为远程ftp文件名
     * @param is 输入流
     * @return
     */
    public boolean uploadFile(String remotePath,String originalFilename, InputStream is);
    
    /**
     * 下载文件
     * @param remotePath 文件所在的远程ftp目录
     * @param filename    文件名
     * @param os    输出流
     * @return
     * @throws IOException
     */
    public  boolean downFile(String remotePath,String filename, OutputStream os) throws IOException;
    
    /**
     * 删除文件
     * @param remotePath 文件所在ftp目录
     * @param filename 文件名
     * @return
     * @throws IOException
     */
    boolean deleteFiles(String remotePath,String filename) throws IOException;
    
    /**
     * 关闭客户端
     * @param ftpClient
     */
    public void closeClient(FTPClient ftpClient);
    
    
}

实现类 FTPHandlerImpl.java

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FTPHandlerImpl implements FTPHandler {
    
    private static final Logger LOGGER= LoggerFactory.getLogger(FTPHandlerImpl.class);
    
    private static String url=""; 
    private static int port=21; 
    private static String username=null;
    private static String password=null;
    private static String remotePath=null;
    private FTPClient ftpClient = null;  
    
    
    static {
        Properties configP;
        try {
            configP = PropertiesUtils.getWebLoProperties("configure");
            url = configP.getProperty("downFileService.ftp.url");
            username = configP.getProperty("downFileService.ftp.username");
            password = configP.getProperty("downFileService.ftp.password");
            remotePath = configP.getProperty("downFileService.ftp.remotePath");
        //    localPath = configP.getProperty("downFileService.ftp.localPath");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    

    public FTPHandlerImpl() {
        FTPClient ftpClient = new FTPClient();  
        this.ftpClient=ftpClient;
    }

    @Override
    public boolean connect() throws SocketException, IOException {
        boolean success=true;
        ftpClient.connect(url, port);
        boolean login = ftpClient.login(username, password);
        int replyCode = ftpClient.getReplyCode();  
        if (!FTPReply.isPositiveCompletion(replyCode)) {  
           success=false;
        }
        return success&&login;
        
    }

    @Override
    public boolean uploadFile(String _remotePath,String storeFilename, InputStream is) {
        boolean success=false;
        try {
            // 切换到path指定的目录  
            if(StringUtils.isBlank(_remotePath)){
                _remotePath=remotePath;
            }
            
            createOrChangeDir(_remotePath);
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            ftpClient.setFileTransferMode(FTP.BINARY_FILE_TYPE);  
            success = ftpClient.storeFile(storeFilename, is);  
            is.close();  
        } catch (IOException e) {
            e.printStackTrace();
            
        }
         closeClient(ftpClient); 
        return success;  
    }

    @Override
    public boolean downFile(String _remotePath,String filename, OutputStream os) throws IOException {
        // 解决图片上传失真  
        //解决图片下载失真  
        // 切换到path指定的目录  
        if(StringUtils.isBlank(_remotePath)){
            _remotePath=remotePath;
        }
        createOrChangeDir(_remotePath);
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);  
        ftpClient.setFileTransferMode(FTP.BINARY_FILE_TYPE);
        FTPFile[] ftpFiles = ftpClient.listFiles();
        boolean success=false;
        for (FTPFile file : ftpFiles) {  
            if (file.getName().equals(filename)) {  
                filename = file.getName();  
                success = ftpClient.retrieveFile(filename, os);  
                break;  
            }  
        }
        closeClient(ftpClient); 
        return success;  
    }

    @Override
    public boolean deleteFiles(String _remotePath,String fileName) throws IOException {
        // 切换到path指定的目录  
        if(StringUtils.isBlank(_remotePath)){
            _remotePath=remotePath;
        }
        ftpClient.changeWorkingDirectory(_remotePath);
        FTPFile[] ftpFiles = ftpClient.listFiles();
         boolean isDelete = false;
         for (FTPFile file : ftpFiles) {
             if (fileName.equalsIgnoreCase(file.getName())) {
                 ftpClient.deleteFile(file.getName());  
                 isDelete = true;  
             }  
           
         }  
     closeClient(ftpClient);  
     return isDelete;  
    }
    
    @Override
    public void closeClient(FTPClient ftpClient) {
         try {  
                if (ftpClient != null) {  
                    ftpClient.logout();  
                }  
            } catch (Exception e) {  
                e.printStackTrace();  
            } finally {  
                if (ftpClient != null && ftpClient.isConnected()) {  
                    try {  
                        ftpClient.disconnect();  
                    } catch (IOException ioe) {  
                        ioe.printStackTrace();  
                    }  
                }  
            }  
        
    }
    
    
    /** 
     * 创建目录(有则切换目录,没有则创建目录) 
     * @param dir 
     * @return 
     */  
    private boolean createOrChangeDir(String dir){  
        if(StringUtils.isBlank(dir))  
            return true;  
        String d;  
        try {  
            //目录编码,解决中文路径问题  
            d = new String(dir.toString().getBytes("UTF-8"),"iso-8859-1");  
            //尝试切入目录  
            if(ftpClient.changeWorkingDirectory(d))  
                return true;  
            
            dir = StringUtils.removeStart(dir, "/");
            dir = StringUtils.removeEnd(dir, "/");
            String[] arr =  dir.split("/");  
            StringBuffer sbfDir=new StringBuffer();  
            //循环生成子目录  
            for(String s : arr){  
                sbfDir.append("/");  
                sbfDir.append(s);  
                //目录编码,解决中文路径问题  
                d = new String(sbfDir.toString().getBytes("UTF-8"),"iso-8859-1");  
                //尝试切入目录  
                if(ftpClient.changeWorkingDirectory(d))  
                    continue;  
                if(!ftpClient.makeDirectory(d)){  
                    LOGGER.info("[失败]ftp创建目录:"+sbfDir.toString());  
                    return false;  
                }  
                LOGGER.info("[成功]创建ftp目录:"+sbfDir.toString());  
            }  
            //将目录切换至指定路径  
            return ftpClient.changeWorkingDirectory(d);  
        } catch (Exception e) {  
            e.printStackTrace();  
            return false;  
        }  
    }  

}  

工场类 FTPFactory.java

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.SocketException;
public class FTPFactory {
    
    public static final String HANDLE_FTP="ftp";
    public static final String HANDLE_SFTP="sftp";
    
    /**
     * 获取FTPHandler对象,目前只实现了ftp
     * @param handleName HANDLE_FTP或HANDLE_SFTP
     * @return
     */
    public static FTPHandler getHandler(String handleName){
        FTPHandler handler=null;
        if(handleName.equals(HANDLE_FTP)){
            handler=new FTPHandlerImpl();
        }
        return handler;
    }
    
    public static void main(String[] args) throws SocketException, IOException {
        FTPHandler handler = getHandler(HANDLE_FTP);
        boolean connect = handler.connect();
        if(connect){
            File f=new File("C:\\Users\\pcdalao\\Desktop\\definitions.json");
            InputStream is=new FileInputStream(f);
            boolean uploadFile = handler.uploadFile("/upload_case/20170825/测试", "definition_test.json", is);
            if(uploadFile){
                System.out.println("success");
            }else{
                
                System.out.println("fail");
            }
            
        }
        
    }
      
}

使用的时候,直接从工程获取即可。

说明:PropertiesUtils这个工具类,有很多可以替代的实现,需要自己实现哦。

就此一个完整的FTP操作完成。记录一下,方便自己,也方便园子里的朋友参考。设计不当之处,请多多指教。

 

posted on 2017-08-28 18:18  幸运的凌人  阅读(1064)  评论(0编辑  收藏  举报