记录:Java上传文件到FTP服务器代码以及问题
作者:互联网
java代码参考的https://www.jianshu.com/p/44d9b05691a8大佬的代码,场景是原项目测试时期是存储文件到本地的,但是部署服务器之后有FTP文件服务器存在,需要将原本的代码更改为上传到ftp的代码。
1、是有多个pom文件的项目需要把maven放在最外面一层的pom文件里面,不然会出现依赖循环问题。
2、不能在ftp上创建文件夹的问题,可能存在已经创建好的根目录的文件所属用户不是ftp的使用者用户。需要 chown 用户 目录或文件名,更改文件夹拥有者。
接下来是使用到的代码部分:
1、pom依赖
<!--commons-net -->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.5</version>
</dependency>
2、FTP工具类
package www.hrabbit.cn.util;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import java.io.*;
import java.net.MalformedURLException;
/**
* @Auther: hrabbit
* @Date: 2018-04-21 下午12:35
* @Description:
*/
public class FTPUtils {
public static FTPClient ftpClient = null;
/**
* 初始化ftp服务器
*/
public static void initFtpClient(String hostname,String username,String password,Integer port) {
ftpClient = new FTPClient();
ftpClient.setControlEncoding("utf-8");
try {
//连接ftp服务器
ftpClient.connect(hostname, port);
//登录ftp服务器
ftpClient.login(username, password);
//是否成功登录服务器
int replyCode = ftpClient.getReplyCode();
if(!FTPReply.isPositiveCompletion(replyCode)){
System.out.println("ftp服务器登录成功");
}
}catch (MalformedURLException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
}
/**
* 上传文件
* @param pathname ftp服务保存地址
* @param fileName 上传到ftp的文件名
* @param inputStream 输入文件流
* @return
*/
public static boolean uploadFile(String hostname,String username,String password,Integer port, String pathname, String fileName,InputStream inputStream){
boolean flag = false;
try{
System.out.println("开始上传文件");
initFtpClient(hostname,username,password,port);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
CreateDirecroty(pathname);
ftpClient.makeDirectory(pathname);
ftpClient.setControlEncoding("utf-8");
ftpClient.storeFile(fileName, inputStream);
System.out.println("上传结束");
inputStream.close();
ftpClient.logout();
flag = true;
System.out.println("上传文件成功");
}catch (Exception e) {
System.out.println("上传文件失败");
e.printStackTrace();
}finally{
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
}
}
if(null != inputStream){
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
//改变目录路径
public static boolean changeWorkingDirectory(String directory) {
boolean flag = true;
try {
flag = ftpClient.changeWorkingDirectory(directory);
if (flag) {
System.out.println("进入文件夹" + directory + " 成功!");
} else {
System.out.println("进入文件夹" + directory + " 失败!开始创建文件夹");
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
return flag;
}
//创建多层目录文件,如果有ftp服务器已存在该文件,则不创建,如果无,则创建
public static boolean CreateDirecroty(String remote) throws IOException {
boolean success = true;
String directory = remote + "/";
// 如果远程目录不存在,则递归创建远程服务器目录
if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) {
int start = 0;
int end = 0;
if (directory.startsWith("/")) {
start = 1;
} else {
start = 0;
}
end = directory.indexOf("/", start);
String path = "";
String paths = "";
while (true) {
String subDirectory = new String(remote.substring(start, end).getBytes("UTF-8"), "iso-8859-1");
path = path + "/" + subDirectory;
if (!existFile(path)) {
if (makeDirectory(subDirectory)) {
changeWorkingDirectory(subDirectory);
} else {
System.out.println("创建目录[" + subDirectory + "]失败");
changeWorkingDirectory(subDirectory);
}
} else {
changeWorkingDirectory(subDirectory);
}
paths = paths + "/" + subDirectory;
start = end + 1;
end = directory.indexOf("/", start);
// 检查所有目录是否创建完毕
if (end <= start) {
break;
}
}
}
return success;
}
//判断ftp服务器文件是否存在
public static boolean existFile(String path) throws IOException {
boolean flag = false;
FTPFile[] ftpFileArr = ftpClient.listFiles(path);
if (ftpFileArr.length > 0) {
flag = true;
}
return flag;
}
//创建目录
public static boolean makeDirectory(String dir) {
boolean flag = true;
try {
flag = ftpClient.makeDirectory(dir);
if (flag) {
System.out.println("创建文件夹" + dir + " 成功!");
} else {
System.out.println("创建文件夹" + dir + " 失败!");
}
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
/** * 下载文件 *
* @param pathname FTP服务器文件目录 *
* @param filename 文件名称 *
* @param localpath 下载后的文件路径 *
* @return */
public static boolean downloadFile(String hostname,String username,String password,Integer port,String pathname, String filename, String localpath){
boolean flag = false;
OutputStream os=null;
try {
System.out.println("开始下载文件");
initFtpClient(hostname,username,password,port);
//切换FTP目录
ftpClient.changeWorkingDirectory(pathname);
FTPFile[] ftpFiles = ftpClient.listFiles();
for(FTPFile file : ftpFiles){
if(filename.equalsIgnoreCase(file.getName())){
File localFile = new File(localpath + "/" + file.getName());
os = new FileOutputStream(localFile);
ftpClient.retrieveFile(file.getName(), os);
os.close();
}
}
ftpClient.logout();
flag = true;
System.out.println("下载文件成功");
} catch (Exception e) {
System.out.println("下载文件失败");
e.printStackTrace();
} finally{
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
}
}
if(null != os){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
/** * 删除文件 *
* @param pathname FTP服务器保存目录 *
* @param filename 要删除的文件名称 *
* @return */
public static boolean deleteFile(String hostname,String username,String password,Integer port,String pathname, String filename){
boolean flag = false;
try {
System.out.println("开始删除文件");
initFtpClient(hostname,username,password,port);
//切换FTP目录
ftpClient.changeWorkingDirectory(pathname);
ftpClient.dele(filename);
ftpClient.logout();
flag = true;
System.out.println("删除文件成功");
} catch (Exception e) {
System.out.println("删除文件失败");
e.printStackTrace();
} finally {
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
}
}
}
return flag;
}
}
标签:FTP,Java,String,System,flag,println,上传,ftpClient,out 来源: https://blog.csdn.net/a1099380657/article/details/120885578