If you need to upload files across servers, you are uploading our local files to the resource server. The better way is to upload them through ftp. This is uploaded in combination with SpringMVC+ftp. We need to first understand how to configure springMVC, then configure ftp, and finally upload the file in combination with MultipartFile.
SpringMVC upload requires several key jar packages, spring and associated packages can be configured by yourself. Here we mainly explain the key jar packages
1: spring-web-3.2.9.RELEASE.jar (the key jar package of spring, you can choose the version yourself)
2: commons-io-2.2.jar (some tool packages used to handle IO in the project)
Configuration File
SpringMVC uses MultipartFile to upload files, so we need to configure MultipartResolver to handle files in the form
<!-- Upload file interpreter--> <bean id="multipartResolver"> <property name="defaultEncoding" value="utf-8" /> <property name="maxUploadSize" value="10485760" /> <property name="maxInMemorySize" value="4096" /> <property name="resolveLazily" value="true" /> </bean>
The attributes are explained in detail:
defaultEncoding configures the encoding format of the request, default iso-8859-1
The maximum unit of the maxUploadSize configuration file, in bytes
maxInMemorySize configures the cache of uploaded files, in bytes
The resolveLazily property is enabled to delay file resolution so that file size exceptions can be caught in UploadAction
Page configuration
Add enctype="multipart/form-data" to the form of the page
<form id="" name="" method="post" action="" enctype="multipart/form-data">
Set enctype="multipart/form-data" in the form tag to ensure the correct encoding of the anonymous uploaded file.
It is the MIME encoding of the form. By default, this encoding format is application/x-www-form-urlencoded, which cannot be used for file upload; only by using multipart/form-data can the file data be fully passed and the following operations are performed. enctype="multipart/form-data" is to upload binary data. The input value in form is passed in 2-digit way, so the request cannot get the value.
Write upload control class
Write an upload method, and there is no result returned here. If you need to jump to the page or return other values, you can change void to String, Map<String, Object> and other values, and then return to return to return the result.
/** * Upload* @param request * @return */ @ResponseBody @RequestMapping(value = "/upload", method = {RequestMethod.GET, RequestMethod.POST}) public void upload(HttpServletRequest request) { MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request; MultipartFile file = multipartRequest.getFile("file");//file is the name name of the page input String basePath = "File Path" try { MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext()); if (resolver.isMultipart(request)) { String fileStoredPath = "Folder Path"; // Random generated file name String randomName = StringUtil.getRandomFileName(); String uploadFileName = file.getOriginalFilename(); if (StringUtils.isNotBlank(uploadFileName)) { //Intercept the file format name String suffix = uploadFileName.substring(uploadFileName.indexOf(".")); //Reassemble the file name String newFileName = randomName + suffix; String savePath = basePath + "/" + newFileName; File saveFile = new File(savePath); File parentFile = saveFile.getParentFile(); if (saveFile.exists()) { saveFile.delete(); } else { if (!parentFile.exists()) { parentFile.mkdirs(); } } //Copy the file to the specified path FileUtils.copyInputStreamToFile(file.getInputStream(), saveFile); //Upload the file to the server FTPClientUtil.upload(saveFile, fileStoredPath); } } } catch (Exception e) { e.printStackTrace(); } } FTP client upload tool
package com.yuananding.common.util; 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 java.util.HashMap; import java.util.Map; import java.util.Properties; import org.apache.commons.lang.StringUtils; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * FTP Client Tools*/ public class FTPClientUtil { /** * Log*/ private static final Logger LOGGER = LoggerFactory.getLogger(FTPClientUtil.class); /** * FTP server configuration--IP key,value is type of String */ public static final String SERVER_IP = "SERVER_IP"; /** * FTP server configuration--Port key,value is type of Integer */ public static final String SERVER_PORT = "SERVER_PORT"; /** * FTP server configuration--ANONYMOUS Log in key, value is type of Boolean */ public static final String IS_ANONYMOUS = "IS_ANONYMOUS"; /** * user name of anonymous log in */ public static final String ANONYMOUS_USER_NAME = "anonymous"; /** * password of anonymous log in */ public static final String ANONYMOUS_PASSWORD = ""; /** * FTP server configuration--log in user name, value is type of String */ public static final String USER_NAME = "USER_NAME"; /** * FTP server configuration--log in password, value is type of String */ public static final String PASSWORD = "PASSWORD"; /** * FTP server configuration--PASV key, value is type of Boolean */ public static final String IS_PASV = "IS_PASV"; /** * FTP server configuration--working directory key, value is type of String While logging in, the current directory * is the user's home directory, the workingDirectory must be set based on it. Besides, the workingDirectory must * exist, it can not be created automatically. If not exist, file will be uploaded in the user's home directory. If * not assigned, "/" is used. */ public static final String WORKING_DIRECTORY = "WORKING_DIRECTORY"; public static Map<String, Object> serverCfg = new HashMap<String, Object>(); static Properties prop; static{ LOGGER.info("Start loading the ftp.properties file!"); prop = new Properties(); try { InputStream fps = FTPClientUtil.class.getResourceAsStream("/ftp.properties"); prop.load(fps); fps.close(); } catch (Exception e) { LOGGER.error("Exception reads the ftp.properties file!",e); } serverCfg.put(FTPClientUtil.SERVER_IP, values("SERVER_IP")); serverCfg.put(FTPClientUtil.SERVER_PORT, Integer.parseInt(values("SERVER_PORT"))); serverCfg.put(FTPClientUtil.USER_NAME, values("USER_NAME")); serverCfg.put(FTPClientUtil.PASSWORD, values("PASSWORD")); LOGGER.info(String.valueOf(serverCfg)); } /** * Upload a file to FTP server. * * @param serverCfg : FTP server configuration * @param filePathToUpload : path of the file to upload * @param fileStoredName : the name to give the remote stored file, null, "" and other blank word will be replaced * by the file name to upload * @throws IOException * @throws SocketException */ public static final void upload(Map<String, Object> serverCfg, String filePathToUpload, String fileStoredName) throws SocketException, IOException { upload(serverCfg, new File(filePathToUpload), fileStoredName); } /** * Upload a file to FTP server. * * @param serverCfg : FTP server configuration * @param fileToUpload : file to upload * @param fileStoredName : the name to give the remote stored file, null, "" and other blank word will be replaced * by the file name to upload * @throws IOException * @throws SocketException */ public static final void upload(Map<String, Object> serverCfg, File fileToUpload, String fileStoredName) throws SocketException, IOException { if (!fileToUpload.exists()) { throw new IllegalArgumentException("File to upload does not exists:" + fileToUpload.getAbsolutePath ()); } if (!fileToUpload.isFile()) { throw new IllegalArgumentException("File to upload is not a file:" + fileToUpload.getAbsolutePath()); } if (StringUtils.isBlank((String) serverCfg.get(SERVER_IP))) { throw new IllegalArgumentException("SERVER_IP must be contained in the FTP server configuration."); } transferFile(true, serverCfg, fileToUpload, fileStoredName, null, null); } /** * Download a file from FTP server * * @param serverCfg : FTP server configuration * @param fileNameToDownload : file name to be downloaded * @param fileStoredPath : stored path of the downloaded file in local * @throws SocketException * @throws IOException */ public static final void download(Map<String, Object> serverCfg, String fileNameToDownload, String fileStoredPath) throws SocketException, IOException { if (StringUtils.isBlank(fileNameToDownload)) { throw new IllegalArgumentException("File name to be downloaded can not be blank."); } if (StringUtils.isBlank(fileStoredPath)) { throw new IllegalArgumentException("Stored path of the downloaded file in local can not be blank."); } if (StringUtils.isBlank((String) serverCfg.get(SERVER_IP))) { throw new IllegalArgumentException("SERVER_IP must be contained in the FTP server configuration."); } transferFile(false, serverCfg, null, null, fileNameToDownload, fileStoredPath); } private static final void transferFile(boolean isUpload, Map<String, Object> serverCfg, File fileToUpload, String serverFileStoredName, String fileNameToDownload, String localFileStoredPath) throws SocketException, IOException { String host = (String) serverCfg.get(SERVER_IP); Integer port = (Integer) serverCfg.get(SERVER_PORT); Boolean isAnonymous = (Boolean) serverCfg.get(IS_ANONYMOUS); String username = (String) serverCfg.get(USER_NAME); String password = (String) serverCfg.get(PASSWORD); Boolean isPASV = (Boolean) serverCfg.get(IS_PASV); String workingDirectory = (String) serverCfg.get(WORKING_DIRECTORY); FTPClient ftpClient = new FTPClient(); InputStream fileIn = null; OutputStream fileOut = null; try { if (port == null) { LOGGER.debug("Connect to FTP server on " + host + ":" + FTP.DEFAULT_PORT); ftpClient.connect(host); } else { LOGGER.debug("Connect to FTP server on " + host + ":" + port); ftpClient.connect(host, port); } int reply = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { LOGGER.error("FTP server refuses connection"); return; } if (isAnonymous != null && isAnonymous) { username = ANONYMOUS_USER_NAME; password = ANONYMOUS_PASSWORD; } LOGGER.debug("Log in FTP server with username = " + username + ", password = " + password); if (!ftpClient.login(username, password)) { LOGGER.error("Fail to log in FTP server with username = " + username + ", password = " + password); ftpClient.logout(); return; } // Here we will use the BINARY mode as the transfer file type, // ASCII mode is not supported. LOGGER.debug("Set type of the file, which is to upload, to BINARY."); ftpClient.setFileType(FTP.BINARY_FILE_TYPE); if (isPASV != null && isPASV) { LOGGER.debug("Use the PASV mode to transfer file."); ftpClient.enterLocalPassiveMode(); } else { LOGGER.debug("Use the ACTIVE mode to transfer file."); ftpClient.enterLocalActiveMode(); } if (StringUtils.isBlank(workingDirectory)) { workingDirectory = "/"; } LOGGER.debug("Change current working directory to " + workingDirectory); changeWorkingDirectory(ftpClient,workingDirectory); if (isUpload) { // upload if (StringUtils.isBlank(serverFileStoredName)) { serverFileStoredName = fileToUpload.getName(); } fileIn = new FileInputStream(fileToUpload); LOGGER.debug("Upload file : " + fileToUpload.getAbsolutePath() + " to FTP server with name : " + serverFileStoredName); if (!ftpClient.storeFile(serverFileStoredName, fileIn)) { LOGGER.error("Fail to upload file, " + ftpClient.getReplyString()); } else { LOGGER.debug("Success to upload file."); } } else { // download // make sure the file directory exists File fileStored = new File(localFileStoredPath); if (!fileStored.getParentFile().exists()) { fileStored.getParentFile().mkdirs(); } fileOut = new FileOutputStream(fileStored); LOGGER.debug("Download file : " + fileNameToDownload + " from FTP server to local : " + localFileStoredPath); if (!ftpClient.retrieveFile(fileNameToDownload, fileOut)) { LOGGER.error("Fail to download file, " + ftpClient.getReplyString()); } else { LOGGER.debug("Success to download file."); } } ftpClient.noop(); ftpClient.logout(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException f) { } } if (fileIn != null) { try { fileIn.close(); } catch (IOException e) { } } if (fileOut != null) { try { fileOut.close(); } catch (IOException e) { } } } private static final boolean changeWorkingDirectory(FTPClient ftpClient, String workingDirectory) throws IOException{ if(!ftpClient.changeWorkingDirectory(workingDirectory)){ String [] paths = workingDirectory.split("/"); for(int i=0 ;i<paths.length ;i++){ if(!"".equals(paths[i])){ if(!ftpClient.changeWorkingDirectory(paths[i])){ ftpClient.makeDirectory(paths[i]); ftpClient.changeWorkingDirectory(paths[i]); } } } return true; } public static final void upload(Map<String, Object> serverCfg, String filePathToUpload, String fileStoredPath, String fileStoredName) throws SocketException, IOException { upload(serverCfg, new File(filePathToUpload), fileStoredPath, fileStoredName); } public static final void upload(Map<String, Object> serverCfg, File fileToUpload, String fileStoredPath, String fileStoredName) throws SocketException, IOException { if(fileStoredPath!=null && !"".equals(fileStoredPath)){ serverCfg.put(WORKING_DIRECTORY, fileStoredPath); } upload(serverCfg, fileToUpload, fileStoredName); } public static final void upload(String filePathToUpload, String fileStoredPath)throws SocketException, IOException { upload(serverCfg, filePathToUpload, fileStoredPath, ""); } public static final void upload(File fileToUpload, String fileStoredPath)throws SocketException, IOException { upload(serverCfg, fileToUpload, fileStoredPath, ""); } public static String values(String key) { String value = prop.getProperty(key); if (value != null) { return value; } else { return null; } } } ftp.properties
#Server address SERVER_IP=192.168.1.1 #Server port SERVER_PORT=21 #Account name USER_NAME=userftp #Password#PASSWORD=passwordftp
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