标签:
在JAVA程序中,经常需要和FTP打交道,比如向FTP服务器上传文件、下载文件,本文简单介绍如何利用jakarta commons中的FTPClient(在commons-net包中)实现上传下载文件。
一、上传文件
原理就不介绍了,大家直接看代码吧
- publicstaticboolean 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);
-
- ftp.login(username, password);
- 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;
- }<pre></pre>
/**
* Description: 向FTP服务器上传文件
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔红保(cuihongbao@d-heaven.com)创建
* @param url FTP服务器hostname
* @param port FTP服务器端口
* @param username FTP登录账号
* @param password FTP登录密码
* @param path FTP服务器保存目录
* @param filename 上传到FTP服务器上的文件名
* @param input 输入流
* @return 成功返回true,否则返回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);//连接FTP服务器
//如果采用默认端口,可以使用ftp.connect(url)的方式直接连接FTP服务器
ftp.login(username, password);//登录
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;
}
下面我们写两个小例子:
1.将本地文件上传到FTP服务器上,代码如下:
- @Test
- publicvoid 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>
@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();
}
}
2.在FTP服务器上生成一个文件,并将一个字符串写入到该文件中
- @Test
- publicvoid 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>
@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();
}
}
二、下载文件
从FTP服务器下载文件的代码也很简单,参考如下:
- publicstaticboolean 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);
-
- 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());
-
- 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;
- }<pre></pre>
- 来源:http://blog.csdn.net/hbcui1984/article/details/2720204
JAVA中使用FTPClient实现文件上传下载
标签:
原文地址:http://www.cnblogs.com/likeju/p/5108784.html