java实现文件上传下载至ftp服务器

以前做的一个项目，用到了文件上传下载至ftp服务器，现在对其进行一下复习，比较简单，一下就能看明白。
环境：首先，先安装ftp服务器，我是在win8本地用IIS配置的， 百度一下就可以找到安装文档。

1.在你的项目目录下建立ftp配置文件，目录如下图

01 ftpconfig.properties:

ftpIp=10.73.222.29
ftpPort=21
ftpUser=WP
ftpPwd=04143114wp
ftpRemotePath=d://share 

02 读取ftpconfig.properties中的具体内容的类：

 package com.java.core.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;


public class ReadFtpProperties {
  private InputStream is;
  private Properties properties;

  public ReadFtpProperties() {
    is = this.getClass().getResourceAsStream("/ftpconfig.properties");// 将配置文件读入输入流中
    properties = new Properties();
    try {
      properties.load(is);
    } catch (IOException e) {
      System.out.println("配置文件不存在..");
      e.printStackTrace();
    } finally {

      if (null != is) {

 try {
   is.close();
 } catch (IOException e) {
   System.out.println("关闭流失败..");
   e.printStackTrace();
 }
      }

    }

  }

  public String getIp() {// 获取ftp服务器的ip地址
    return properties.getProperty("ftpIp");

  }

  public String getPort() {// 获取ftp服务器的端口
    return properties.getProperty("ftpPort");

  }

  public String getUser() {// 获取ftp登录用户名
    return properties.getProperty("ftpUser");

  }

  public String getPwd() {// 获取ftp服务器的登录密码
    return properties.getProperty("ftpPwd");

  }

  public String getRemotePath() {// 获取ftp服务器的存放文件的目录
    return properties.getProperty("ftpRemotePath");

  }

}

03 文件上传下载的接口类

package com.java.web.service;

import java.io.InputStream;
import org.apache.commons.net.ftp.FTPClient;
import com.java.core.util.ReadFtpProperties;



public interface FtpService {
  
  public boolean loginFTP(FTPClient client, ReadFtpProperties rfp);

  
  public boolean logout(FTPClient client);//

  
  public boolean uploadFile(FTPClient client, String remotePath,
      String fileNewName, InputStream inputStream, ReadFtpProperties rfp);

  
  public InputStream downFileByFtp(FTPClient client, String remotePath,
      String fileName);

  
  public boolean delFile(FTPClient client, String pathName);

}

04 文件上传下载的接口实现类

package com.java.web.service.serviceImpl;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.SocketException;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import com.java.core.util.ReadFtpProperties;
import com.java.web.service.FtpService;


public class FtpServiceImpl implements FtpService {

  public boolean loginFTP(FTPClient client, ReadFtpProperties rfp) {
    String ftpIp = rfp.getIp();
    String ftpPort = rfp.getPort();
    String ftpUser = rfp.getUser();
    String ftpPwd = rfp.getPwd();
    // String fgtpRemotePath = rfp.getRemotePath();
    boolean b = false;

    try {
      client.connect(ftpIp, Integer.parseInt(ftpPort));
    } catch (NumberFormatException e) {
      System.out.println("无法连接到ftp");
      return false;
    } catch (SocketException e) {
      System.out.println("无法连接到ftp");
      return false;
    } catch (IOException e) {
      System.out.println("无法连接到ftp");
      return false;
    }
    client.setControlEncoding("uft-8");
    try {
      b = client.login(ftpUser, ftpPwd);
    } catch (IOException e) {
      System.out.println("登录ftp出错");
      logout(client);// 退出/断开FTP服务器链接
      return false;
    }
    return b;

  }

  public boolean logout(FTPClient client) {
    boolean b = false;

    try {
      b = client.logout();// 退出登录
      client.disconnect();// 断开连接
    } catch (IOException e) {
      return false;
    }
    return b;

  }

  public boolean uploadFile(FTPClient client, String remotePath,
      String fileNewName, InputStream inputStream, ReadFtpProperties rfp) {
    boolean b = false;
    try {
      client.setFileType(FTPClient.BINARY_FILE_TYPE);
      client.enterLocalPassiveMode();
      if (remotePath != null && !"".equals(remotePath.trim())) {
 String[] pathes = remotePath.split("/");
 for (String onepath : pathes) {
   if (onepath == null || "".equals(onepath.trim())) {
     continue;
   }

   onepath = new String(onepath.getBytes("utf-8"),
"iso-8859-1");
   System.out.println("onepath=" + onepath);
   if (!client.changeWorkingDirectory(onepath)) {
     client.makeDirectory(onepath);// 创建FTP服务器目录
     client.changeWorkingDirectory(onepath);// 改变FTP服务器目录
   } else {
     System.out.println("文件单路径");
   }
 }
      }
      b = client.storeFile(new String(fileNewName.getBytes("utf-8"),
   "iso-8859-1"), inputStream);
    } catch (UnsupportedEncodingException e) {
      return false;
    } catch (IOException e) {
      return false;
    }
    return b;
  }

  public InputStream downFileByFtp(FTPClient ftpClient, String remotePath,
      String fileName) {

    FTPFile[] fs;
    InputStream is = null;
    try {
      // 设置被动模式
      ftpClient.enterLocalPassiveMode();
      // 设置以二进制流的方式传输
      ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
      // 设置编辑格式
      ftpClient.setControlEncoding("utf-8");

      remotePath = remotePath.substring(0,
   remotePath.lastIndexOf(fileName));
      fs = ftpClient.listFiles(remotePath);// 递归目标目录
      for (FTPFile ff : fs) {
 if (ff.getName().equals(fileName)) {// 查找目标文件
   is = ftpClient.retrieveFileStream(new String(
(remotePath + fileName).getBytes("utf-8"),
"iso-8859-1"));
   break;
 }
      }

    } catch (IOException e) {

      e.printStackTrace();
    }
    return is;

  }

  public boolean delFile(FTPClient ftpClient, String pathName) {
    boolean b = false;

    try {
      b = ftpClient.deleteFile(pathName);

      return b;
    } catch (Exception e) {
      return false;
    } finally {
      logout(ftpClient);// 退出/断开FTP服务器链接
    }

  }

}

代码很好理解，看一遍应该就可以理解，在这儿就不具体分析了，主要看代码中的注释。

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