Java下載遠程服務器文件到本地（基於http協議和ssh2協議）

<!--遠程讀取服務器文件-->
 <dependency>
  <groupId>ch.ethz.ganymed</groupId>
  <artifactId>ganymed-ssh2</artifactId>
  <version>262</version>
 </dependency>
 <dependency>
  <groupId>com.jcraft</groupId>
  <artifactId>jsch</artifactId>
  <version>0.1.53</version>
 </dependency>
 <dependency>
  <groupId>commons-net</groupId>
  <artifactId>commons-net</artifactId>
  <version>3.4</version>
 </dependency>

package com.XXX.utils;

import ch.ethz.ssh2.*;
import com.databus.Log;
import com.mysql.jdbc.StringUtils;

import java.io.*;
import java.net.*;

public class FileUtils {

 public static boolean downloadFile(String urlString,String fileName,String filePath) {
  boolean bool = false;

  InputStream is = null;
  FileOutputStream os = null;
  try {
   Log.info("文件路徑：" + urlString);
   // 構造URL
   java.net.URL url = new java.net.URL(urlString);
   // 打開連接
   URLConnection con = url.openConnection();
   // 輸入流
   is = con.getInputStream();
   // 1K的數據緩沖
   byte[] bs = new byte[1024];
   // 讀取到的數據長度
   int len;
   //判斷指定目錄是否存在，不存在則先創建目錄
   File file = new File(filePath);
   if (!file.exists())
    file.mkdirs();
   //fileName如果不包含文件後綴，則需要加上後綴，如：fileName + ".jpg";fileName + ".txt";
   os = new FileOutputStream(filePath + fileName, false);//false：覆蓋文件,true:在原有文件後追加
   // 開始讀取
   while ((len = is.read(bs)) != -1) {
    os.write(bs, 0, len);
   }

   bool = true;
   Log.info("文件保存成功：" + fileName);
  }catch (Exception e){
   e.printStackTrace();
  }finally {
   // 完畢，關閉所有鏈接
   if (null != os){
    try {
     os.flush();
     os.close();
    }catch (IOException e){
     e.printStackTrace();
    }
   }
   if (null != is){
    try {
     is.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
  return bool;
 }

 //遠程下載服務器文件
 public static boolean copyFile(String ip,int port,String userName,String password,String sourceFile,String targetFile,String targetFileName){
  boolean bool = false;
  Connection conn = null;
  Session session = null;
  try {
   if (StringUtils.isNullOrEmpty(ip) || StringUtils.isNullOrEmpty(userName) || StringUtils.isNullOrEmpty(password) ||
     StringUtils.isNullOrEmpty(sourceFile) || StringUtils.isNullOrEmpty(targetFile)){
    return bool;
   }
   conn = new Connection(ip,port);
   conn.connect();
   boolean isAuth = conn.authenticateWithPassword(userName,password);
   if (!isAuth){
    Log.info("算法主機連接失敗");
    return bool;
   }
   //執行命令
   session = conn.openSession();

   //執行命令並打印執行結果
   session.execCommand("df -h");
   InputStream staout = new StreamGobbler(session.getStdout());
   BufferedReader br = new BufferedReader(new InputStreamReader(staout));
   String line = null;
   while ((line = br.readLine()) != null){
    System.out.println(line);
   }
   br.close();

   //下載文件到本地
   SCPClient scpClient = conn.createSCPClient();
   SCPInputStream scpis = scpClient.get(sourceFile);

   //判斷指定目錄是否存在，不存在則先創建目錄
   File file = new File(targetFile);
   if (!file.exists())
    file.mkdirs();

   FileOutputStream fos = new FileOutputStream(targetFile + targetFileName);
   byte[] buffer = new byte[1024];
   int len = 0;
   while ((len = scpis.read(buffer)) != -1){
    fos.write(buffer,0,len);
   }
   fos.close();
   bool = true;
   //SFTP
   /*SFTPv3Client sftPClient = new SFTPv3Client(conn);
   sftPClient.createFile("");
   sftPClient.close();*/
  }catch (Exception e){
   e.printStackTrace();
   Log.info(e.getMessage());
   Log.info("保存失敗：" + sourceFile);
  }finally {
   if (null != session){
    session.close();
   }
   if (null != conn) {
    conn.close();
   }
  }

  return bool;
 }


}

//執行命令
  session = conn.openSession();

  //執行命令並打印執行結果
  session.execCommand("df -h");
  InputStream staout = new StreamGobbler(session.getStdout());
  BufferedReader br = new BufferedReader(new InputStreamReader(staout));
  String line = null;
  while ((line = br.readLine()) != null){
  System.out.println(line);
  }
  br.close();

//SFTP
  /*SFTPv3Client sftPClient = new SFTPv3Client(conn);
  sftPClient.createFile("files");
  sftPClient.close();*/