java 需求：ftp 远程文件下载 插入到数据表中，进行其他表数据更新

jar包：rt.jar
注：JDK1.5包下的 sun.net.ftp.FtpClient
以下都是方法调用

 private FtpClient ftpClient = null;
public static void main(String[] args) {

	List fileList = ftpClient.getFileList(ftpdir);//服务器路径
	//要下载的远程文件
	String remoteFile = "./aaa/" + "文件名".replace("/","");
	//本地生成的文件路径
	String localFile =  "./bbb/" +  "文件名" + ".txt";
	connectServer("服务器地址","登录用户","登录密码","文件夹，空代表根目录");
	
	//建立本地目录（文件夹）
	File file = new File(localFile);
	if(!file.getParentFile().exists()) {
		boolean result = file.getParentFile().mkdirs();
		log.info(file.getParentFile().getPath() + "不存在，建立新目录，创建结果： " + result);
	}
	//循环遍历需要下载的文件
	for (int j = 0; j<fileList.size();j++) {
		if(remoteFile.equals(fileList.get(j))) {
			download1(remoteFile ,localFile );
		}
	}

	//关闭ftp连接
	ftpClient。close();
	br = new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF-8"));
	//读取文件数据数据插入表
	String line = null;
	StringBuffer strBuffer = new StringBuffer();
	while((line = br.readLine()) != null) {
		strBuffer.append(line+"/n");
		String[] strs = line.split("分隔符");
		//插入数据库
		str[0];str[1]...
	}catch(Exception e) {
		e.printStackTrace();
	} finally {
		br.close();
	}

	return "成功";

	

}
/**
*ftp 连接服务器
*server 服务器地址
user:服务器登录用户名
password:服务器登录密码
path 文件夹，空代表根目录
*/
public void connectServer(String server,String user,String password,String path) throws IOException{
	ftpClient  = new FtpClient();
	ftpClient.openServer(server);
	ftpClient.login(user,password);
	ftpCd(path);
	//用二进制上传下载
	//ftpClient.binary();
	//用ASCII码上传下载
	ftpClient.ascii();
}

/**
*更改ftp服务器路径
sRemotePath 文件夹，空代表根目录
*/
public void ftpCd(String sRemotePath) throws IOException{
	if(sRemotePath.length() != 0){
		ftpClient.cd(sRemotePath);
	}
}



/**
*取得某个目录下所有文件列表
path：目录路径
@return 文件列表
*/

public long download(String path){
	List<String> list = new ArrayList();
	try {
		BufferedReader br = new BufferedReader(new InputStreamReader(ftpClient.nameList(path)));
		String filename = "";
		while(filename = br.readLine() != null) {
			list.add(filename);
		}
	} catch(Exception e) {
		e.printStackTrace();
	}
	return list;
}

/**
*从ftp下载文件到本地
*@Return 成功下载，返回文件大小
filenmae:服务器上的文件名
newfilename:本地生成的文件名
*/

public long download1(String filename,String newfilename) throws {
	long result = 0;
	TelnetInputStream is = null;
	FileOutputStream = null;
	try{
		is = ftpClient.get(filename);
		java.io.File outfile = new File(newfilename);
		os = new FileOutputStream(outfile);
		byte[] bytes = new byte[1024];
		int c;
		while((c = is.read(bytes) != -1)){
			os.write(bytes,0,c);
			result = result+c;
		}
	} catch(IOException e) {
		e.printStackTrace();
	} finally {
		if(is != null) {
			is.close();
		}
		if(os != null) {
			os.close();
		}
	
	}
}