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基于SSM框架实现利用FTP上传文件至Linux远程服务器
摘要：JavaWEB开发通常采用SSM框架，在完成web开发时经常涉及到远程访问Linux服务器实现文件上传。通常实现文件上传可通过InputStream和OutputStream实现文件读写操作，但对于Linux服务器需要ftp传输协议来完成。
本文章将解决利用SSM框架实现利用ftp文件传输协议上传文件至linux远程服务器。
- linux安装FTP协议
- Java源码
一、linux安装FTP协议
如果你未使用过linux服务器，可通过腾讯云或阿里云等服务器提供商购买服务器，并完成相应安装。
1、如果你已经安装好FTP，直接跳到下一节，未安装可参考：linux系统需要自主安装FTP协议，在命令控制台输入
$ yum install -y vsftpd
2、安装完毕后打开21端口或关闭防火墙：
$ iptables -A INPUT -ptcp --dport 21 -j ACCEPT
$ chkconfig iptables off
3、安装后的ftp还需要修改配置文件，允许当前user（默认是root）启用FTP：
$ vim /etc/vsftpd/vsftpd.conf
4、进入后修改或添加（允许任何用户通过FTP操作linux）：
anonymous_enable=YES
anon_upload_enable=YES
anon_mkdir_write_enable=YES
同时修改（设置为YES表示user_list内的用户允许访问FTP）：
dirmessage_enable=YES
5、启动FTP
$ service vsftpd start
二、Java源码
实现SSM框架的上传文件的java源码如下：
1、前端视图JSP：
<form role="form" action="addNewTask" id="singleForm" method="post" enctype="multipart/form-data">
<div class="card-body">
<div class="form-group">
<label for="taskInfo">任务描述</label>
<input type="text" class="form-control" id="taskInfo" name="taskInfo" placeholder="请填写任务描述">
</div>
<div class="form-group">
<label for="singleFile">选择图片</label>
<div class="input-group">
<div class="custom-file">
<input type="file" class="custom-file-input" id="singleFile" name="taskImg" onchange="checkFileKind(0)" >
<label class="custom-file-label" for="singleFile">选择本地图片</label>
</div>
</div>
</div>
</div>
<div class="card-footer">
<button type="button" class="btn btn-primary" onclick="createTask(0);">创建任务</button>
<button type="reset" class="btn btn-default">重新填写</button>
</div>
</form>
2、控制层Controller：
@RequestMapping(value = "/admin/taskManage/addNewTask")
public ModelAndView addNewTask(@RequestParam("taskImg") MultipartFile taskImg,
@RequestParam("taskInfo") String taskInfo, ModelAndView mv,HttpSession session){
// 根据登录名和密码查找用户，判断用户登录
User user = (User)session.getAttribute("user");
if(user == null){
mv.setView(new RedirectView("/ImgTag/login"));
return mv;
}
//获取单文件的字节流
InputStream input = null;
try {
input = taskImg.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
//设置路径
String uploadPath = "task/" + cellid;
String fileName = "0.jpg";
//上传至linux服务器
UploadFileByFTP.UploadFile(input, uploadPath, fileName);
//修改目录权限（可能创建的文件夹不具有写功能，所以修改权限）
String order = "chmod 777 " + GetPath.getProjectRealPath() + "task/" + cellid;
e.Compile(GetPath.hostname, GetPath.username, GetPath.password, order);
mv.setView(new RedirectView("*****"));
mv.setViewName("*****");
return mv;
}
3、Java的FTP协议（用于上传文件）：
package com.imgtag.util;
/*
* code by WangJianing
* email:[email protected]
* time:2018.11.17
*
* function: upload file(s) to linux os in cloud
*/
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.SocketException;
import java.util.StringTokenizer;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import sun.net.ftp.FtpClient;
public class UploadFileByFTP {
/*
* file:待上传的文件对象
* path:待上传保存的地址
* newFileName:保存的文件名称及格式
*
* */
public static void UploadFile(File file, String path, String newFileName){
//File file = new File("E:/学校文件/软件工程.xls");
//String newFileName = "软件工程.xls";
//创建ftp客户端
FTPClient ftpClient = new FTPClient();
ftpClient.setControlEncoding("GBK");
String hostname = GetPath.hostname;
int port = 21;
String username = GetPath.username;
String password = GetPath.password;
try {
//链接ftp服务器
ftpClient.connect(hostname, port);
//登录ftp
ftpClient.login(username, password);
int reply = ftpClient.getReplyCode();
System.out.println(reply);
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
return ;
}
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
String file_path = GetPath.getProjectRealPath() + path;
//ftpClient.makeDirectory(file_path);//在root目录下创建文件夹
StringTokenizer s = new StringTokenizer(file_path, "/");
s.countTokens();
String pathName = "";
while (s.hasMoreElements()) {
pathName = pathName + "/" + (String) s.nextElement();
try {
ftpClient.mkd(pathName);
} catch (Exception e) {
}
}
InputStream input = new FileInputStream(file);
ftpClient.storeFile(file_path + "/" + newFileName, input);/
input.close();
ftpClient.logout();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally
{
if (ftpClient.isConnected())
{
try
{
ftpClient.disconnect();
} catch (IOException ioe)
{
ioe.printStackTrace();
}
}
}
}
/*
* input:待上传的文件字节流
* path:待上传保存的地址
* newFileName:保存的文件名称及格式
*
* */
public static void UploadFile(InputStream input, String path, String newFileName){
//创建ftp客户端
FTPClient ftpClient = new FTPClient();
ftpClient.setControlEncoding("GBK");
String hostname = GetPath.hostname;
int port = 21;
String username = GetPath.username;
String password = GetPath.password;
try {
//链接ftp服务器
ftpClient.connect(hostname, port);
//登录ftp
ftpClient.login(username, password);
int reply = ftpClient.getReplyCode();
System.out.println(reply);
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
return ;
}
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
String file_path = GetPath.getProjectRealPath() + path;
//ftpClient.makeDirectory(file_path);//在root目录下创建文件夹
StringTokenizer s = new StringTokenizer(file_path, "/");
s.countTokens();
String pathName = "";
while (s.hasMoreElements()) {
pathName = pathName + "/" + (String) s.nextElement();
try {
ftpClient.mkd(pathName);
} catch (Exception e) {
}
}
ftpClient.storeFile(file_path + "/" + newFileName, input);//文件若是不指定就会上传到root目录下
input.close();
ftpClient.logout();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally
{
if (ftpClient.isConnected())
{
try
{
ftpClient.disconnect();
} catch (IOException ioe)
{
ioe.printStackTrace();
}
}
}
}
4、Java远程控制linux命令（用于远程执行Linux命令）：
package com.imgtag.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
public class ExecuteLinuxCmd {
public String stateCode = "";
public String getStateCode() {
return stateCode;
}
public String executeLinuxCmd(String cmd) {
System.out.println("got cmd job : " + cmd);
Runtime run = Runtime.getRuntime();
try {
Process process = run.exec(cmd);
InputStream in = process.getInputStream();
BufferedReader bs = new BufferedReader(new InputStreamReader(in));
// System.out.println("[check] now size \n"+bs.readLine());
String result = null;
while (in.read() != -1) {
result = bs.readLine();
System.out.println("job result [" + result + "]");
}
in.close();
// process.waitFor();
process.destroy();
return result;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public String Linux(String hostname,String user_id,String user_pass,String order){
String prompt = "";
try
{
/* Create a connection instance */
Connection conn = new Connection(hostname);
/* Now connect */
conn.connect();
/* Authenticate.
* If you get an IOException saying something like
* "Authentication method password not supported by the server at this stage."
* then please check the FAQ.
*/
boolean isAuthenticated = conn.authenticateWithPassword(user_id, user_pass);
if (isAuthenticated == false)
throw new IOException("Authentication failed.");
/* Create a session */
Session sess = conn.openSession();
sess.execCommand(order);
System.out.println("Here is some information about the remote host:");
/*
* This basic example does not handle stderr, which is sometimes dangerous
* (please read the FAQ).
*/
InputStream stdout = new StreamGobbler(sess.getStdout());
BufferedReader br = new BufferedReader(new InputStreamReader(stdout,"UTF-8"))
int num = 0;
while (true){
String string = br.readLine();
if ("null".equals(string)||string == null||"".equals(string))
break;
else {
if(num == 0){
prompt += string;
num = 1;
}else {
prompt += "\n" + string;
}
}
}
/* Show exit status, if available (otherwise "null") */
System.out.println("ExitCode: " + sess.getExitStatus());
stateCode = String.valueOf(sess.getExitStatus());
/* Close this session */
sess.close();
/* Close the connection */
conn.close();
}
catch (IOException e)
{
e.printStackTrace(System.err);
System.exit(2);
}
return prompt;
}
public String Compile(String hostname,String user_id,String user_pass,String order){
String prompt = "";
try{
Connection conn = new Connection(hostname);
conn.connect();
boolean isAuthenticated = conn.authenticateWithPassword(user_id, user_pass);
if (isAuthenticated == false)
throw new IOException("Authentication failed.");
Session sess = conn.openSession();
sess.execCommand(order);
System.out.println("Here is some information about the remote host:");
StringBuffer sb = new StringBuffer();
InputStream stdout = new StreamGobbler(sess.getStdout());
BufferedReader br = new BufferedReader(new InputStreamReader(stdout,"UTF-8"));
String line = "";
while ((line = br.readLine()) != null) {
System.out.println(line);
sb.append(line).append("<br>");
}
prompt = sb.toString();
System.out.println("ExitCode: " + sess.getExitStatus());
stateCode = String.valueOf(sess.getExitStatus());
sess.close();
conn.close();
}
catch (IOException e){
e.printStackTrace(System.err);
System.exit(2);
}
return prompt;
}
}
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