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最近在写一个FTP上传工具,用到了Apache的FTPClient,但是每个线程频繁的创建和销毁FTPClient对象对服务器的压力很大,因此,此处最好使用一个FTPClient连接池。仔细翻了一下Apache的api,发现它并没有一个FTPClientPool的实现,所以,不得不自己写一个FTPClientPool。下面就大体介绍一下开发连接池的整个过程,供大家参考。
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我们可以利用Apache提供的common-pool包来协助我们开发连接池。而开发一个简单的对象池,仅需要实现common-pool 包中的ObjectPool和PoolableObjectFactory两个接口即可。
线程池的意义
为了减少频繁创建、销毁对象带来的性能消耗,我们可以利用对象池的技术来实现对象的复用。对象池提供了一种机制,它可以管理对象池中对象的生命周期,提供了获取和释放对象的方法,可以让客户端很方便的使用对象池中的对象。
pom引入依赖
commons-net commons-net 3.5 commons-pool commons-pool 1.6 org.apache.commons commons-pool2 2.0
创建ftp配置信息
在resources目录下创建ftp.properties配置文件,目录结构如下:
添加如下的配置信息:
########### FTP用户名称 ########### ftp.userName=hrabbit ########### FTP用户密码 ########### ftp.passWord=123456 ########### FTP主机IP ########### ftp.host=127.0.0.1 ########### FTP主机端口号 ########### ftp.port=21 ########### 保存根路径 ########### ftp.baseUrl=/
创建FTPProperties.java配置文件
加载配置内容到Spring中,配置信息基本延用我的就可以。
/** * FTP的配置信息 * @Auther: hrabbit * @Date: 2018-12-03 2:06 PM * @Description: */ @Data @Component @PropertySource("classpath:ftp.properties") @ConfigurationProperties(prefix = "ftp") public class FTPProperties { private String username; private String password; private String host; private Integer port; private String baseUrl; private Integer passiveMode = FTP.BINARY_FILE_TYPE; private String encoding="UTF-8"; private int clientTimeout=120000; private int bufferSize; private int transferFileType=FTP.BINARY_FILE_TYPE; private boolean renameUploaded; private int retryTime; }
创建FTPClientPool线程池
/** * 自定义实现ftp连接池 * @Auther: hrabbit * @Date: 2018-12-03 3:40 PM * @Description: */ @Slf4j @SuppressWarnings("all") public class FTPClientPool implements ObjectPool{ private static final int DEFAULT_POOL_SIZE = 10; public BlockingQueue blockingQueue; private FTPClientFactory factory; public FTPClientPool(FTPClientFactory factory) throws Exception { this(DEFAULT_POOL_SIZE, factory); } public FTPClientPool(int poolSize, FTPClientFactory factory) throws Exception { this.factory = factory; this.blockingQueue = new ArrayBlockingQueue (poolSize); initPool(poolSize); } /** * 初始化连接池 * @param maxPoolSize * 最大连接数 * @throws Exception */ private void initPool(int maxPoolSize) throws Exception { int count = 0; while(count < maxPoolSize) { this.addObject(); count++; } } /** * 从连接池中获取对象 */ @Override public FTPClient borrowObject() throws Exception { FTPClient client = blockingQueue.take(); if(client == null) { client = factory.makeObject(); } else if(!factory.validateObject(client)) { invalidateObject(client); client = factory.makeObject(); } return client; } /** * 返还一个对象(链接) */ @Override public void returnObject(FTPClient client) throws Exception { if ((client != null) && !blockingQueue.offer(client,2,TimeUnit.MINUTES)) { try { factory.destroyObject(client); } catch (Exception e) { throw e; } } } /** * 移除无效的对象(FTP客户端) */ @Override public void invalidateObject(FTPClient client) throws Exception { blockingQueue.remove(client); } /** * 增加一个新的链接,超时失效 */ @Override public void addObject() throws Exception { blockingQueue.offer(factory.makeObject(), 2, TimeUnit.MINUTES); } /** * 重新连接 */ public FTPClient reconnect() throws Exception { return factory.makeObject(); } /** * 获取空闲链接数(这里暂不实现) */ @Override public int getNumIdle() { return blockingQueue.size(); } /** * 获取正在被使用的链接数 */ @Override public int getNumActive() { return DEFAULT_POOL_SIZE - getNumIdle(); } @Override public void clear() throws Exception { } /** * 关闭连接池 */ @Override public void close() { try { while(blockingQueue.iterator().hasNext()) { FTPClient client = blockingQueue.take(); factory.destroyObject(client); } } catch(Exception e) { log.error("close ftp client pool failed...{}", e); } } /** * 增加一个新的链接,超时失效 */ public void addObject(FTPClient ftpClient) throws Exception { blockingQueue.put(ftpClient); } }
创建一个FTPClientFactory工厂类
创建FTPClientFactory实现PoolableObjectFactory的接口,FTPClient工厂类,通过FTPClient工厂提供FTPClient实例的创建和销毁
/** * FTPClient 工厂 * @Auther: hrabbit * @Date: 2018-12-03 3:41 PM * @Description: */ @Slf4j @SuppressWarnings("all") public class FTPClientFactory implements PoolableObjectFactory{ private FTPProperties ftpProperties; public FTPClientFactory(FTPProperties ftpProperties) { this.ftpProperties = ftpProperties; } @Override public FTPClient makeObject() throws Exception { FTPClient ftpClient = new FTPClient(); ftpClient.setControlEncoding(ftpProperties.getEncoding()); ftpClient.setConnectTimeout(ftpProperties.getClientTimeout()); try { ftpClient.connect(ftpProperties.getHost(), ftpProperties.getPort()); int reply = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftpClient.disconnect(); log.warn("FTPServer refused connection"); return null; } boolean result = ftpClient.login(ftpProperties.getUsername(), ftpProperties.getPassword()); ftpClient.setFileType(ftpProperties.getTransferFileType()); if (!result) { log.warn("ftpClient login failed... username is {}", ftpProperties.getUsername()); } } catch (Exception e) { log.error("create ftp connection failed...{}", e); throw e; } return ftpClient; } @Override public void destroyObject(FTPClient ftpClient) throws Exception { try { if(ftpClient != null && ftpClient.isConnected()) { ftpClient.logout(); } } catch (Exception e) { log.error("ftp client logout failed...{}", e); throw e; } finally { if(ftpClient != null) { ftpClient.disconnect(); } } } @Override public boolean validateObject(FTPClient ftpClient) { try { return ftpClient.sendNoOp(); } catch (Exception e) { log.error("Failed to validate client: {}"); } return false; } @Override public void activateObject(FTPClient obj) throws Exception { //Do nothing } @Override public void passivateObject(FTPClient obj) throws Exception { //Do nothing } }
创建FTPUtils.java的工具类
FTPUtils.java中封装了上传、下载等方法,在项目启动的时候,在@PostConstruct注解的作用下通过执行init()的方法,创建FTPClientFactory工厂中,并初始化了FTPClientPool线程池,这样每次调用方法的时候,都直接从FTPClientPool中取出一个FTPClient对象
/** * @Auther: hrabbit * @Date: 2018-12-03 3:47 PM * @Description: */ @Slf4j @Component public class FTPUtils { /** * FTP的连接池 */ @Autowired public static FTPClientPool ftpClientPool; /** * FTPClient对象 */ public static FTPClient ftpClient; private static FTPUtils ftpUtils; @Autowired private FTPProperties ftpProperties; /** * 初始化设置 * @return */ @PostConstruct public boolean init() { FTPClientFactory factory = new FTPClientFactory(ftpProperties); ftpUtils = this; try { ftpClientPool = new FTPClientPool(factory); } catch (Exception e) { e.printStackTrace(); return false; } return true; } /** * 获取连接对象 * @return * @throws Exception */ public static FTPClient getFTPClient() throws Exception { //初始化的时候从队列中取出一个连接 if (ftpClient==null) { synchronized (ftpClientPool) { ftpClient = ftpClientPool.borrowObject(); } } return ftpClient; } /** * 当前命令执行完成命令完成 * @throws IOException */ public void complete() throws IOException { ftpClient.completePendingCommand(); } /** * 当前线程任务处理完成,加入到队列的最后 * @return */ public void disconnect() throws Exception { ftpClientPool.addObject(ftpClient); } /** * Description: 向FTP服务器上传文件 * * @Version1.0 * @param remoteFile * 上传到FTP服务器上的文件名 * @param input * 本地文件流 * @return 成功返回true,否则返回false */ public static boolean uploadFile(String remoteFile, InputStream input) { boolean result = false; try { getFTPClient(); ftpClient.enterLocalPassiveMode(); result = ftpClient.storeFile(remoteFile, input); input.close(); ftpClient.disconnect(); } catch (Exception e) { e.printStackTrace(); } return result; } /** * Description: 向FTP服务器上传文件 * * @Version1.0 * @param remoteFile * 上传到FTP服务器上的文件名 * @param localFile * 本地文件 * @return 成功返回true,否则返回false */ public static boolean uploadFile(String remoteFile, String localFile){ FileInputStream input = null; try { input = new FileInputStream(new File(localFile)); } catch (FileNotFoundException e) { e.printStackTrace(); } return uploadFile(remoteFile, input); } /** * 拷贝文件 * @param fromFile * @param toFile * @return * @throws Exception */ public boolean copyFile(String fromFile, String toFile) throws Exception { InputStream in=getFileInputStream(fromFile); getFTPClient(); boolean flag = ftpClient.storeFile(toFile, in); in.close(); return flag; } /** * 获取文件输入流 * @param fileName * @return * @throws IOException */ public static InputStream getFileInputStream(String fileName) throws Exception { ByteArrayOutputStream fos=new ByteArrayOutputStream(); getFTPClient(); ftpClient.retrieveFile(fileName, fos); ByteArrayInputStream in=new ByteArrayInputStream(fos.toByteArray()); fos.close(); return in; } /** * Description: 从FTP服务器下载文件 * * @Version1.0 * @return */ public static boolean downFile(String remoteFile, String localFile){ boolean result = false; try { getFTPClient(); OutputStream os = new FileOutputStream(localFile); ftpClient.retrieveFile(remoteFile, os); ftpClient.logout(); ftpClient.disconnect(); result = true; } catch (Exception e) { e.printStackTrace(); } finally { try { } catch (Exception e) { e.printStackTrace(); } } return result; } /** * 从ftp中获取文件流 * @param filePath * @return * @throws Exception */ public static InputStream getInputStream(String filePath) throws Exception { getFTPClient(); InputStream inputStream = ftpClient.retrieveFileStream(filePath); return inputStream; } /** * ftp中文件重命名 * @param fromFile * @param toFile * @return * @throws Exception */ public boolean rename(String fromFile,String toFile) throws Exception { getFTPClient(); boolean result = ftpClient.rename(fromFile,toFile); return result; } /** * 获取ftp目录下的所有文件 * @param dir * @return */ public FTPFile[] getFiles(String dir) throws Exception { getFTPClient(); FTPFile[] files = new FTPFile[0]; try { files = ftpClient.listFiles(dir); }catch (Throwable thr){ thr.printStackTrace(); } return files; } /** * 获取ftp目录下的某种类型的文件 * @param dir * @param filter * @return */ public FTPFile[] getFiles(String dir, FTPFileFilter filter) throws Exception { getFTPClient(); FTPFile[] files = new FTPFile[0]; try { files = ftpClient.listFiles(dir, filter); }catch (Throwable thr){ thr.printStackTrace(); } return files; } /** * 创建文件夹 * @param remoteDir * @return 如果已经有这个文件夹返回false */ public boolean makeDirectory(String remoteDir) throws Exception { getFTPClient(); boolean result = false; try { result = ftpClient.makeDirectory(remoteDir); } catch (IOException e) { e.printStackTrace(); } return result; } public boolean mkdirs(String dir) throws Exception { boolean result = false; if (null == dir) { return result; } getFTPClient(); ftpClient.changeWorkingDirectory("/"); StringTokenizer dirs = new StringTokenizer(dir, "/"); String temp = null; while (dirs.hasMoreElements()) { temp = dirs.nextElement().toString(); //创建目录 ftpClient.makeDirectory(temp); //进入目录 ftpClient.changeWorkingDirectory(temp); result = true; } ftpClient.changeWorkingDirectory("/"); return result; } }
创建FtpClientTest.java测试类
上传一张图片到FTP服务器,并将文件重新命名为hrabbit.jpg,代码如下:
/** * FtpClient测试 * @Auther: hrabbit * @Date: 2018-12-21 9:14 PM * @Description: */ @RunWith(SpringRunner.class) @SpringBootTest public class FtpClientTest { /** * 测试上传 */ @Test public void uploadFile(){ boolean flag = FTPUtils.uploadFile("hrabbit.jpg", "/Users/mrotaku/Downloads/klklklkl_4x.jpg"); Assert.assertEquals(true, flag); } }
程序完美运行,这时候我们查看我们的FTP服务器,http://localhost:8866/hrabbit.jpg
码云地址:https://gitee.com/hrabbit/hrabbit-admin
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。