JAVA中使用FTPClient上傳下載
在JAVA程序中,經(jīng)常需要和FTP打交道,比如向FTP服務器上傳文件、下載文件,本文簡單介紹如何利用jakarta commons中的FTPClient(在commons-net包中)實現(xiàn)上傳下載文件。
一、上傳文件
原理就不介紹了,大家直接看代碼吧
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- public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {
- boolean success = false;
- FTPClient ftp = new FTPClient();
- try {
- int reply;
- ftp.connect(url, port);
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- ftp.login(username, password);
- reply = ftp.getReplyCode();
- if (!FTPReply.isPositiveCompletion(reply)) {
- ftp.disconnect();
- return success;
- }
- ftp.changeWorkingDirectory(path);
- ftp.storeFile(filename, input);
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- input.close();
- ftp.logout();
- success = true;
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if (ftp.isConnected()) {
- try {
- ftp.disconnect();
- } catch (IOException ioe) {
- }
- }
- }
- return success;
- }<pre></pre>
/*** Description: 向FTP服務器上傳文件* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔紅保(cuihongbao@d-heaven.com)創(chuàng)建* @param url FTP服務器hostname* @param port FTP服務器端口* @param username FTP登錄賬號* @param password FTP登錄密碼* @param path FTP服務器保存目錄* @param filename 上傳到FTP服務器上的文件名* @param input 輸入流* @return 成功返回true,否則返回false*/public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {boolean success = false;FTPClient ftp = new FTPClient();try {int reply;ftp.connect(url, port);//連接FTP服務器//如果采用默認端口,可以使用ftp.connect(url)的方式直接連接FTP服務器ftp.login(username, password);//登錄reply = ftp.getReplyCode();if (!FTPReply.isPositiveCompletion(reply)) {ftp.disconnect();return success;}ftp.changeWorkingDirectory(path);ftp.storeFile(filename, input);input.close();ftp.logout();success = true;} catch (IOException e) {e.printStackTrace();} finally {if (ftp.isConnected()) {try {ftp.disconnect();} catch (IOException ioe) {}}}return success;}
下面我們寫兩個小例子:
1.將本地文件上傳到FTP服務器上,代碼如下:
- @Test
- public void testUpLoadFromDisk(){
- try {
- FileInputStream in=new FileInputStream(new File("D:/test.txt"));
- boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in);
- System.out.println(flag);
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- }
- }<pre></pre>
@Testpublic void testUpLoadFromDisk(){try {FileInputStream in=new FileInputStream(new File("D:/test.txt"));boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in);System.out.println(flag);} catch (FileNotFoundException e) {e.printStackTrace();}}
2.在FTP服務器上生成一個文件,并將一個字符串寫入到該文件中
- @Test
- public void testUpLoadFromString(){
- try {
- InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8"));
- boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input);
- System.out.println(flag);
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- }<pre></pre>
@Testpublic void testUpLoadFromString(){try {InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8"));boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input);System.out.println(flag);} catch (UnsupportedEncodingException e) {e.printStackTrace();}}
二、下載文件
從FTP服務器下載文件的代碼也很簡單,參考如下:
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- public static boolean downFile(String url, int port,String username, String password, String remotePath,String fileName,String localPath) {
- boolean success = false;
- FTPClient ftp = new FTPClient();
- try {
- int reply;
- ftp.connect(url, port);
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- ftp.login(username, password);
- reply = ftp.getReplyCode();
- if (!FTPReply.isPositiveCompletion(reply)) {
- ftp.disconnect();
- return success;
- }
- ftp.changeWorkingDirectory(remotePath);
- FTPFile[] fs = ftp.listFiles();
- for(FTPFile ff:fs){
- if(ff.getName().equals(fileName)){
- File localFile = new File(localPath+"/"+ff.getName());
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- OutputStream is = new FileOutputStream(localFile);
- ftp.retrieveFile(ff.getName(), is);
- is.close();
- }
- }
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- ftp.logout();
- success = true;
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if (ftp.isConnected()) {
- try {
- ftp.disconnect();
- } catch (IOException ioe) {
- }
- }
- }
- return success;
- }<pre></pre>
/*** Description: 從FTP服務器下載文件* @Version1.0 Jul 27, 2008 5:32:36 PM by 崔紅保(cuihongbao@d-heaven.com)創(chuàng)建* @param url FTP服務器hostname* @param port FTP服務器端口* @param username FTP登錄賬號* @param password FTP登錄密碼* @param remotePath FTP服務器上的相對路徑* @param fileName 要下載的文件名* @param localPath 下載后保存到本地的路徑* @return*/public static boolean downFile(String url, int port,String username, String password, String remotePath,String fileName,String localPath) {boolean success = false;FTPClient ftp = new FTPClient();try {int reply;ftp.connect(url, port);//如果采用默認端口,可以使用ftp.connect(url)的方式直接連接FTP服務器ftp.login(username, password);//登錄reply = ftp.getReplyCode();if (!FTPReply.isPositiveCompletion(reply)) {ftp.disconnect();return success;}ftp.changeWorkingDirectory(remotePath);//轉移到FTP服務器目錄FTPFile[] fs = ftp.listFiles();for(FTPFile ff:fs){if(ff.getName().equals(fileName)){File localFile = new File(localPath+"/"+ff.getName());OutputStream is = new FileOutputStream(localFile);ftp.retrieveFile(ff.getName(), is);is.close();}}ftp.logout();success = true;} catch (IOException e) {e.printStackTrace();} finally {if (ftp.isConnected()) {try {ftp.disconnect();} catch (IOException ioe) {}}}return success;}
發(fā)表于 @ 2008年07月27日 18:35:00|評論(12)|收藏