apache common-net 学习笔记

kevin0490

相关下载:
commons-net down:http://commons.apache.org/net/download.html
公司提出需要通过ftp上传下载文件,总结一下(备忘)
package cn.xt.net.ftp;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.junit.Test;
public class Ftpclient {
final static String PATH="d:/zhanghuadong/";
final static String SERVICE_ADDRESS="192.168.0.115";
final static String USER="ftpuser";
final static String PASSWORD="ftpuser";
final static String DOWN_FILE_NAME="XF200070750845720090218";
/**
* Ftp下载
*
*/
@Test
public void ftpQuery(){
FTPClient client=new FTPClient();
try {
client.connect(SERVICE_ADDRESS);
boolean islogon=client.login(USER, PASSWORD);
FTPFile[] files=null;
if(islogon){
int reply=client.getReplyCode();
/**判断返回代码 */
if(!FTPReply.isPositiveCompletion(reply)){
throw new Exception("对不起,"+SERVICE_ADDRESS+" user:"+USER+" password:"+PASSWORD+" 连接出错!");
}
/**更改下载的目录 */
client.changeWorkingDirectory("qyyd_fsend/");
files=client.listFiles();
File file=null;
for (int i = 0; i < files.length; i++) {
System.out.println(files.getName());
if(files.getName().equals("XF200070750845720090218")){
System.out.println("down...");
file=new File(PATH+files.getName());
}
}
if(file!=null){
OutputStream out=new FileOutputStream(file);
client.retrieveFile("XF200070750845720090218", out);
System.out.println("down success...");
out.close();
}
System.out.println("logon 成功!");
}
client.logout();
client.disconnect();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch(Exception e){
e.printStackTrace();
}
}
public void ftpUpload(){
FTPClient ftp=new FTPClient();
InputStream stream=null;
try{
//ftp.setDefaultPort(221);
ftp.connect(SERVICE_ADDRESS);
boolean islogon=ftp.login(USER, PASSWORD);
if(islogon){
int recode=ftp.getReplyCode();
if(!FTPReply.isPositiveCompletion(recode)){
throw new Exception("对不起,"+SERVICE_ADDRESS+" user:"+USER+" password:"+PASSWORD+" 连接出错!");
}
stream=new FileInputStream(new File(PATH+DOWN_FILE_NAME));
FTPFile[] files=ftp.listFiles();
int overname=0;
for (int i = 0; i < files.length; i++) {
if(files.getName().indexOf(DOWN_FILE_NAME)!=-1){
overname++;
}
}
if(overname>0){
ftp.rename(DOWN_FILE_NAME, DOWN_FILE_NAME+"."+overname);
}
//设置文件类型 文本类型 二进制文件 区别文本会根据系统加换行符  二进制则不会
ftp.setFileType(FTPClient.ASCII_FILE_TYPE);
boolean isstore=ftp.storeFile(DOWN_FILE_NAME,stream);
stream.close();
if(!isstore){
System.out.println("upload fail ...");
}
System.out.println("upload  success...");
}
}catch(Exception e){
e.printStackTrace();
}finally{
try {
ftp.logout();
ftp.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args){
Ftpclient client=new Ftpclient();
client.ftpUpload();
}
}