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通过FTP4J 实现 FTPS 连接

發(fā)布時(shí)間：2024/4/14 编程问答 39 豆豆

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?FTPS：

一種多傳輸協(xié)議，相當(dāng)于加密版的FTP。當(dāng)你在FTP服務(wù)器上收發(fā)文件的時(shí)候，你面臨兩個(gè)風(fēng)險(xiǎn)。第一個(gè)風(fēng)險(xiǎn)是在上載文件的時(shí)候?yàn)槲募用堋５诙€(gè)風(fēng)險(xiǎn)是，這些文件在你等待接收方下載的時(shí)候?qū)⑼Ａ粼贔TP服務(wù)器上，這時(shí)你如何保證這些文件的安全。你的第二個(gè)選擇(創(chuàng)建一個(gè)支持SSL的FTP服務(wù)器)能夠讓你的主機(jī)使用一個(gè)FTPS連接上載這些文件。這包括使用一個(gè)在FTP協(xié)議下面的SSL層加密控制和數(shù)據(jù)通道。一種替代FTPS的協(xié)議是安全文件傳輸協(xié)議(SFTP)。這個(gè)協(xié)議使用SSH文件傳輸協(xié)議加密從客戶機(jī)到服務(wù)器的FTP連接。
FTPS是在安全套接層使用標(biāo)準(zhǔn)的FTP協(xié)議和指令的一種增強(qiáng)型FTP協(xié)議，為FTP協(xié)議和數(shù)據(jù)通道增加了SSL安全功能。FTPS也稱作“FTP-SSL”和“FTP-over-SSL”。SSL是一個(gè)在客戶機(jī)和具有SSL功能的服務(wù)器之間的安全連接中對(duì)數(shù)據(jù)進(jìn)行加密和解密的協(xié)議。

當(dāng)使用FTPS與服務(wù)器連接時(shí)，有兩種方法：顯式和隱式。
簡(jiǎn)單來(lái)說(shuō)：
顯示又叫FTPES, FTPS客戶端跟FTPS服務(wù)器必須顯式使用一種同樣的加密方法。如果客戶端不要求加密，服務(wù)器也允許非加密通訊。
隱式就是客戶端直接通過(guò)TSL/SSL加密與服務(wù)器聯(lián)系，如果服務(wù)器無(wú)響應(yīng)，則停止通訊。

FTP4J 支持 FTPS/FTPES secured connection，其中使用FTPES還是原來(lái)的21端口，使用FTPS使用的是990端口，使用SFTP的是22端口，以下說(shuō)的不包含SFTP內(nèi)容。

可以查看Serv-U域詳細(xì)信息查看服務(wù)邦定的端口，默認(rèn)情況下是以下內(nèi)容：

如果我們使用flashfxp進(jìn)行連接，則使用不同連接方式時(shí)要進(jìn)行選擇，普通FTP連接使用21端口，不用選擇：

我們通過(guò)21端口進(jìn)行顯示FTPS連接：

Java代碼

package test;

import it.sauronsoftware.ftp4j.FTPClient;

import java.security.SecureRandom;

import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSocketFactory;

import javax.net.ssl.TrustManager;

import javax.net.ssl.X509TrustManager;

/**

* 通過(guò)21端口進(jìn)行顯示FTPS連接

* @說(shuō)明

* @author cuisuqiang

* @version 1.0

* @since

public class Ftp4jTest {

public static void main(String[] args) {

try {

TrustManager[] trustManager = new TrustManager[] { new X509TrustManager() {

public X509Certificate[] getAcceptedIssuers() {

return null;

}

public void checkClientTrusted(X509Certificate[] certs,

String authType) {

}

public void checkServerTrusted(X509Certificate[] certs,

String authType) {

}

} };

SSLContext sslContext = null;

sslContext = SSLContext.getInstance("SSL");

sslContext.init(null, trustManager, new SecureRandom());

SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

FTPClient client = new FTPClient();

client.setSSLSocketFactory(sslSocketFactory);

client.setSecurity(FTPClient.SECURITY_FTPES);

client.connect("192.168.1.122", 21);

client.login("123", "123123");

System.out.println(client.toString());

System.out.println(client.currentDirectory());

} catch (Exception e) {

e.printStackTrace();

}

package test; import it.sauronsoftware.ftp4j.FTPClient; import java.security.SecureRandom; import java.security.cert.X509Certificate; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocketFactory; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; /*** 通過(guò)21端口進(jìn)行顯示FTPS連接* @說(shuō)明 * @author cuisuqiang* @version 1.0* @since*/ public class Ftp4jTest {public static void main(String[] args) {try {TrustManager[] trustManager = new TrustManager[] { new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return null;}public void checkClientTrusted(X509Certificate[] certs,String authType) {}public void checkServerTrusted(X509Certificate[] certs,String authType) {}} };SSLContext sslContext = null;sslContext = SSLContext.getInstance("SSL");sslContext.init(null, trustManager, new SecureRandom());SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();FTPClient client = new FTPClient();client.setSSLSocketFactory(sslSocketFactory);client.setSecurity(FTPClient.SECURITY_FTPES); client.connect("192.168.1.122", 21);client.login("123", "123123");System.out.println(client.toString());System.out.println(client.currentDirectory());} catch (Exception e) {e.printStackTrace();}} }

代碼會(huì)打印連接信息和當(dāng)前目錄

使用990端口進(jìn)行隱式FTPS連接：

Java代碼

package test;

import it.sauronsoftware.ftp4j.FTPClient;

import java.security.SecureRandom;

import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSocketFactory;

import javax.net.ssl.TrustManager;

import javax.net.ssl.X509TrustManager;

/**

* 進(jìn)行隱式FTPS連接

* @說(shuō)明

* @author cuisuqiang

* @version 1.0

* @since

public class Ftp4jTest {

public static void main(String[] args) {

try {

TrustManager[] trustManager = new TrustManager[] { new X509TrustManager() {

public X509Certificate[] getAcceptedIssuers() {

return null;

}

public void checkClientTrusted(X509Certificate[] certs,

String authType) {

}

public void checkServerTrusted(X509Certificate[] certs,

String authType) {

}

} };

SSLContext sslContext = null;

sslContext = SSLContext.getInstance("SSL");

sslContext.init(null, trustManager, new SecureRandom());

SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

FTPClient client = new FTPClient();

client.setSSLSocketFactory(sslSocketFactory);

client.setSecurity(FTPClient.SECURITY_FTPS);

client.connect("192.168.1.122", 990);

client.login("123", "123123");

System.out.println(client.toString());

System.out.println(client.currentDirectory());

} catch (Exception e) {

e.printStackTrace();

}

package test; import it.sauronsoftware.ftp4j.FTPClient; import java.security.SecureRandom; import java.security.cert.X509Certificate; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocketFactory; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; /*** 進(jìn)行隱式FTPS連接* @說(shuō)明 * @author cuisuqiang* @version 1.0* @since*/ public class Ftp4jTest {public static void main(String[] args) {try {TrustManager[] trustManager = new TrustManager[] { new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return null;}public void checkClientTrusted(X509Certificate[] certs,String authType) {}public void checkServerTrusted(X509Certificate[] certs,String authType) {}} };SSLContext sslContext = null;sslContext = SSLContext.getInstance("SSL");sslContext.init(null, trustManager, new SecureRandom());SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();FTPClient client = new FTPClient();client.setSSLSocketFactory(sslSocketFactory);client.setSecurity(FTPClient.SECURITY_FTPS);client.connect("192.168.1.122", 990);client.login("123", "123123");System.out.println(client.toString());System.out.println(client.currentDirectory());} catch (Exception e) {e.printStackTrace();}} }

打印內(nèi)容相同

進(jìn)行顯示還是隱式連接的最大不同是指定了連接方式：

這個(gè)情況官方也給出了詳細(xì)的說(shuō)明：

The ftp4j library supports both FTPS (FTP over implicit TLS/SSL) and FTPES (FTP over explicit TLS/SSL).
The setSecurity() method can be used to turn on the feature:
client.setSecurity(FTPClient.SECURITY_FTPS); // enables FTPS
client.setSecurity(FTPClient.SECURITY_FTPES); // enables FTPES
Both methods must be called before connecting the remote server.
If the security is set to SECURITY_FTPS, the default port used by the connect() method changes to 990

請(qǐng)您到ITEYE網(wǎng)站看原創(chuàng)，謝謝！

http://cuisuqiang.iteye.com/ ！?

轉(zhuǎn)載于:https://blog.51cto.com/ajiao13/1132563

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