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通过FTP4J 实现 FTPS 连接
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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)文件的時候，你面臨兩個風(fēng)險。第一個風(fēng)險是在上載文件的時候為文件加密。第二個風(fēng)險是，這些文件在你等待接收方下載的時候?qū)⑼Ａ粼贔TP服務(wù)器上，這時你如何保證這些文件的安全。你的第二個選擇(創(chuàng)建一個支持SSL的FTP服務(wù)器)能夠讓你的主機(jī)使用一個FTPS連接上載這些文件。這包括使用一個在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。
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當(dāng)使用FTPS與服務(wù)器連接時，有兩種方法：顯式和隱式。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。
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FTP4J 支持 FTPS/FTPES secured connection，其中使用FTPES還是原來的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：
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如果我們使用flashfxp進(jìn)行連接，則使用不同連接方式時要進(jìn)行選擇，普通FTP連接使用21端口 ，不用選擇：
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我們通過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;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21端口進(jìn)行顯示FTPS連接* @說明 * @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();}}
}
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代碼會打印連接信息和當(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;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();}}
}
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打印內(nèi)容相同
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進(jìn)行顯示還是隱式連接的最大不同是指定了連接方式：
這個情況官方也給出了詳細(xì)的說明：
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
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請您到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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