利用apache ftp工具實現文件的上傳下載和刪除，具體如下
1、下載相應的jar包
commons-net-1.4.1.jar
2、實現代碼如下：
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public class ftputils { //ftp服務器地址 public string hostname = "192.168.1.249"; //ftp服務器端口號默認為21 public integer port = 21 ; //ftp登錄賬號 public string username = "root"; //ftp登錄密碼 public string password = "123"; public ftpclient ftpclient = null; /** * 初始化ftp服務器 */ public void initftpclient() { ftpclient = new ftpclient(); ftpclient.setcontrolencoding("utf-8"); try { system.out.println("connecting...ftp服務器:"+this.hostname+":"+this.port); ftpclient.connect(hostname, port); //連接ftp服務器 ftpclient.login(username, password); //登錄ftp服務器 int replycode = ftpclient.getreplycode(); //是否成功登錄服務器 if(!ftpreply.ispositivecompletion(replycode)){ system.out.println("connect failed...ftp服務器:"+this.hostname+":"+this.port); } system.out.println("connect successfu...ftp服務器:"+this.hostname+":"+this.port); }catch (malformedurlexception e) { e.printstacktrace(); }catch (ioexception e) { e.printstacktrace(); } } /** * 上傳文件 * @param pathname ftp服務保存地址 * @param filename 上傳到ftp的文件名 * @param originfilename 待上傳文件的名稱（絕對地址） * * @return */ public boolean uploadfile( string pathname, string filename,string originfilename){ boolean flag = false; inputstream inputstream = null; try{ system.out.println("開始上傳文件"); inputstream = new fileinputstream(new file(originfilename)); initftpclient(); ftpclient.setfiletype(ftpclient.binary_file_type); createdirecroty(pathname); ftpclient.makedirectory(pathname); ftpclient.changeworkingdirectory(pathname); ftpclient.storefile(filename, inputstream); inputstream.close(); ftpclient.logout(); flag = true; system.out.println("上傳文件成功"); }catch (exception e) { system.out.println("上傳文件失敗"); 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; } /** * 上傳文件 * @param pathname ftp服務保存地址 * @param filename 上傳到ftp的文件名 * @param inputstream 輸入文件流 * @return */ public boolean uploadfile( string pathname, string filename,inputstream inputstream){ boolean flag = false; try{ system.out.println("開始上傳文件"); initftpclient(); ftpclient.setfiletype(ftpclient.binary_file_type); createdirecroty(pathname); ftpclient.makedirectory(pathname); ftpclient.changeworkingdirectory(pathname); ftpclient.storefile(filename, inputstream); inputstream.close(); ftpclient.logout(); flag = true; system.out.println("上傳文件成功"); }catch (exception e) { system.out.println("上傳文件失敗"); 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; } //改變目錄路徑 public boolean changeworkingdirectory(string directory) { boolean flag = true; try { flag = ftpclient.changeworkingdirectory(directory); if (flag) { system.out.println("進入文件夾" + directory + " 成功！"); } else { system.out.println("進入文件夾" + directory + " 失敗！開始創建文件夾"); } } catch (ioexception ioe) { ioe.printstacktrace(); } return flag; } //創建多層目錄文件，如果有ftp服務器已存在該文件，則不創建，如果無，則創建 public boolean createdirecroty(string remote) throws ioexception { boolean success = true; string directory = remote + "/"; // 如果遠程目錄不存在，則遞歸創建遠程服務器目錄 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("gbk"), "iso-8859-1"); path = path + "/" + subdirectory; if (!existfile(path)) { if (makedirectory(subdirectory)) { changeworkingdirectory(subdirectory); } else { system.out.println("創建目錄[" + subdirectory + "]失敗"); changeworkingdirectory(subdirectory); } } else { changeworkingdirectory(subdirectory); } paths = paths + "/" + subdirectory; start = end + 1; end = directory.indexof("/", start); // 檢查所有目錄是否創建完畢 if (end <= start) { break; } } } return success; } //判斷ftp服務器文件是否存在 public boolean existfile(string path) throws ioexception { boolean flag = false; ftpfile[] ftpfilearr = ftpclient.listfiles(path); if (ftpfilearr.length > 0) { flag = true; } return flag; } //創建目錄 public boolean makedirectory(string dir) { boolean flag = true; try { flag = ftpclient.makedirectory(dir); if (flag) { system.out.println("創建文件夾" + dir + " 成功！"); } else { system.out.println("創建文件夾" + dir + " 失敗！"); } } catch (exception e) { e.printstacktrace(); } return flag; } /** * 下載文件 * * @param pathname ftp服務器文件目錄 * * @param filename 文件名稱 * * @param localpath 下載后的文件路徑 * * @return */ public boolean downloadfile(string pathname, string filename, string localpath){ boolean flag = false; outputstream os=null; try { system.out.println("開始下載文件"); initftpclient(); //切換ftp目錄 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("下載文件成功"); } catch (exception e) { system.out.println("下載文件失敗"); 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; } /** * 刪除文件 * * @param pathname ftp服務器保存目錄 * * @param filename 要刪除的文件名稱 * * @return */ public boolean deletefile(string pathname, string filename){ boolean flag = false; try { system.out.println("開始刪除文件"); initftpclient(); //切換ftp目錄 ftpclient.changeworkingdirectory(pathname); ftpclient.dele(filename); ftpclient.logout(); flag = true; system.out.println("刪除文件成功"); } catch (exception e) { system.out.println("刪除文件失敗"); e.printstacktrace(); } finally { if(ftpclient.isconnected()){ try{ ftpclient.disconnect(); }catch(ioexception e){ e.printstacktrace(); } } } return flag; } public static void main(string[] args) { ftputils ftp =new ftputils(); //ftp.uploadfile("ftpfile/data", "123.docx", "e://123.docx"); //ftp.downloadfile("ftpfile/data", "123.docx", "f://"); ftp.deletefile("ftpfile/data", "123.docx"); system.out.println("ok"); } } |
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原文鏈接：https://blog.csdn.net/liu_yulong/article/details/80633281
