详解SpringMVC使用MultipartFile实现文件的上传

详解SpringMVC使用MultipartFile实现文件的上传

如果需要实现跨服务器上传文件，就是将我们本地的文件上传到资源服务器上，比较好的办法就是通过ftp上传。这里是结合SpringMVC+ftp的形式上传的。我们需要先懂得如何配置springMVC，然后在配置ftp，最后再结合MultipartFile上传文件。

springMVC上传需要几个关键jar包，spring以及关联包可以自己配置，这里主要说明关键的jar包

1：spring-web-3.2.9.RELEASE.jar (spring的关键jar包，版本可以自己选择)

2：commons-io-2.2.jar (项目中用来处理IO的一些工具类包)

配置文件

SpringMVC是用MultipartFile来进行文件上传的，因此我们先要配置MultipartResolver，用于处理表单中的file

其中属性详解：

defaultEncoding配置请求的编码格式，默认为iso-8859-1

maxUploadSize配置文件的最大单位，单位为字节

maxInMemorySize配置上传文件的缓存 ，单位为字节

resolveLazily属性启用是为了推迟文件解析，以便在UploadAction 中捕获文件大小异常

页面配置

在页面的form中加上enctype="multipart/form-data"

表单标签中设置enctype="multipart/form-data"来确保匿名上载文件的正确编码。

是设置表单的MIME编码。默认情况，这个编码格式是application/x-www-form-urlencoded，不能用于文件上传；只有使用了multipart/form-data，才能完整的传递文件数据，进行下面的操作。enctype="multipart/form-data"是上传二进制数据。form里面的input的值以2进制的方式传过去，所以request就得不到值了。

编写上传控制类

编写一个上传方法，这里没有返回结果，需要跳转页面或者返回其他值可以将void改为String、Map等值，再return返回结果。

/**

* 上传

* @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是页面input的name名

String basePath = "文件路径"

try {

MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());

if (resolver.isMultipart(request)) {

String fileStoredPath = "文件夹路径";

//随机生成文件名

String randomName = StringUtil.getRandomFileName();

String uploadFileName = file.getOriginalFilename();

if (StringUtils.isNotBlank(uploadFileName)) {

//截取文件格式名

String suffix = uploadFileName.substring(uploadFileName.indexOf("."));

//重新拼装文件名

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();

}

}

//复制文件到指定路径

FileUtils.copyInputStreamToFile(file.getInputStream(), saveFile);

//上传文件到服务器

FTPClientUtil.upload(saveFile, fileStoredPath);

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

FTP客户端上传工具

package com.yuanding.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客户端工具

*/

public class FTPClientUtil {

/**

* 日志

*/

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. BesiaPDdqdes, 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 serverCfg = new HashMap();

static Properties prop;

static{

LOGGER.info("开始加载ftp.properties文件!");

prop = new Properties();

try {

InputStream fps = FTPClientUtil.class.getResourceAsStream("/ftp.properties");

prop.load(fps);

fps.close();

} catch (Exception e) {

LOGGER.error("读取ftp.properties文件异常!",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 IOEhttp://xception

* @throws SocketException

*/

public static final void upload(Map 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 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 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 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 supportted.

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

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 serverCfg, String filePathToUpload, String fileStoredPath, String

fileStoredName)

throws SocketException, IOException {

upload(serverCfg, new File(filePathToUpload), fileStoredPath, fileStoredName);

}

public static final void upload(Map 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

#服务器地址

SERVER_IP=192.168.1.1

#服务器端口

SERVER_PORT=21

#帐号名

USER_NAME=userftp

#密码

#PASSWORD=passwordftp

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 serverCfg, String filePathToUpload, String fileStoredPath, String

fileStoredName)

throws SocketException, IOException {

upload(serverCfg, new File(filePathToUpload), fileStoredPath, fileStoredName);

}

public static final void upload(Map 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

#服务器地址

SERVER_IP=192.168.1.1

#服务器端口

SERVER_PORT=21

#帐号名

USER_NAME=userftp

#密码

#PASSWORD=passwordftp

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