How to download and save a file from Internet using Java

Question

There is an online file  such as http   www example com information asp  I need to grab and save to a directory  I know there are several methods for grabbing and reading online files  URLs  line-by-line  but is there a way to just download and save the file using Java

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public void saveUrl final String filename  final String urlString          throws MalformedURLException  IOException       BufferedInputStream in   null      FileOutputStream fout   null      try           in   new BufferedInputStream new URL urlString  openStream             fout   new FileOutputStream filename            final byte data     new byte 1024           int count          while   count   in read data  0  1024      -1                fout write data  0  count                   finally           if  in    null                in close                      if  fout    null                fout close                        You ll need to handle exceptions  probably external to this method

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There is method U fetch url  in underscore-java library   pom xml      lt groupId gt com github javadev lt  groupId gt     lt artifactId gt underscore lt  artifactId gt     lt version gt 1 45 lt  version gt    Code example   import com github underscore lodash U   public class Download       public static void main String     args            String text   U fetch  https   stackoverflow com questions              921262 how-to-download-and-save-a-file-from-internet-using-java   text

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This answer is almost exactly like selected answer but with two enhancements   it s a method and it closes out the FileOutputStream object       public static void downloadFileFromURL String urlString  File destination                try               URL website   new URL urlString               ReadableByteChannel rbc              rbc   Channels newChannel website openStream                 FileOutputStream fos   new FileOutputStream destination               fos getChannel   transferFrom rbc  0  Long MAX VALUE               fos close                rbc close              catch  IOException e                e printStackTrace

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You can do this in 1 line using netloader for Java   new NetFile new File  my zips 1 zip     https   example com example zip   -1  load      returns true if succeed  otherwise false

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There are many elegant and efficient answers here  But the conciseness can make us lose some useful information  In particular  one often does not want to consider a connection error an Exception  and one might want to treat differently some kind of network-related errors - for example  to decide if we should retry the download   Here s a method that does not throw Exceptions for network errors  only for truly exceptional problems  as malformed url or problems writing to the file          Downloads from a  http https  URL and saves to a file      Does not consider a connection error an Exception  Instead it returns             0 ok         1 connection interrupted  timeout  but something was read        2 not found  FileNotFoundException   404         3 server error  500            4 could not connect  connection timeout  no internet   java net SocketTimeoutException       5 could not connect   server down   java net ConnectException       6 could not resolve host  bad host  or no internet - no dns          param file File to write  Parent directory will be created if necessary     param url  http https url to connect     param secsConnectTimeout Seconds to wait for connection establishment     param secsReadTimeout Read timeout in seconds - trasmission will abort if it freezes more than this      return See above     throws IOException Only if URL is malformed or if could not create the file     public static int saveUrl final Path file  final URL url     int secsConnectTimeout  int secsReadTimeout  throws IOException       Files createDirectories file getParent        make sure parent dir exists   this can throw exception     URLConnection conn   url openConnection       can throw exception if bad url     if  secsConnectTimeout  gt  0   conn setConnectTimeout secsConnectTimeout   1000       if  secsReadTimeout  gt  0   conn setReadTimeout secsReadTimeout   1000       int ret   0      boolean somethingRead   false      try  InputStream is   conn getInputStream              try  BufferedInputStream in   new BufferedInputStream is   OutputStream fout   Files                  newOutputStream file                 final byte data     new byte 8192               int count              while  count   in read data    gt  0                    somethingRead   true                  fout write data  0  count                                 catch java io IOException e             int httpcode   999          try               httpcode     HttpURLConnection  conn  getResponseCode              catch Exception ee             if  somethingRead  amp  amp  e instanceof java net SocketTimeoutException   ret   1          else if  e instanceof FileNotFoundException  amp  amp  httpcode  gt   400  amp  amp  httpcode  lt  500   ret   2           else if  httpcode  gt   400  amp  amp  httpcode  lt  600   ret   3           else if  e instanceof java net SocketTimeoutException   ret   4           else if  e instanceof java net ConnectException   ret   5           else if  e instanceof java net UnknownHostException   ret   6            else throw e            return ret

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Use apache commons-io  just one line code   FileUtils copyURLToFile URL  File

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import java io    import java net     public class filedown       public static void download String address  String localFileName            OutputStream out   null          URLConnection conn   null          InputStream in   null           try               URL url   new URL address               out   new BufferedOutputStream new FileOutputStream localFileName                conn   url openConnection                in   conn getInputStream                byte   buffer   new byte 1024                int numRead              long numWritten   0               while   numRead   in read buffer      -1                    out write buffer  0  numRead                   numWritten    numRead                             System out println localFileName     t    numWritten                      catch  Exception exception                 exception printStackTrace                       finally               try                   if  in    null                        in close                                      if  out    null                        out close                                                 catch  IOException ioe                                       public static void download String address            int lastSlashIndex   address lastIndexOf               if  lastSlashIndex  gt   0  amp  amp          lastSlashIndex  lt  address length   - 1                download address   new URL address   getFile                        else               System err println  Could not figure out local file name for   address                        public static void main String   args            for  int i   0  i  lt  args length  i                  download args i

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public class DownloadManager        static String urls     WEBSITE NAME         public static void main String   args  throws IOException          URL url   verify urls           HttpURLConnection connection    HttpURLConnection  url openConnection            InputStream in   null          String filename   url getFile            filename   filename substring filename lastIndexOf        1           FileOutputStream out   new FileOutputStream  C   Java2 programiranje Network DownloadTest1 Project Output    File separator   filename           in   connection getInputStream            int read   -1          byte   buffer   new byte 4096           while  read   in read buffer      -1               out write buffer  0  read               System out println   SYSTEM INFO   Downloading file                         in close            out close            System out println   SYSTEM INFO   File Downloaded               private static URL verify String url           if  url toLowerCase   startsWith  http                     return null                    URL verifyUrl   null           try              verifyUrl   new URL url            catch Exception e               e printStackTrace                      return verifyUrl

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There is an issue with simple usage of   org apache commons io FileUtils copyURLToFile URL  File     if you need to download and save very large files  or in general if you need automatic retries in case connection is dropped   What I suggest in such cases is Apache HttpClient along with org apache commons io FileUtils  For example   GetMethod method   new GetMethod resource url   try       int statusCode   client executeMethod method       if  statusCode    HttpStatus SC OK            logger error  Get method failed      method getStatusLine                      org apache commons io FileUtils copyInputStreamToFile          method getResponseBodyAsStream    new File resource file          catch  HttpException e            e printStackTrace          catch  IOException e            e printStackTrace          finally       method releaseConnection

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Give Java NIO a try   URL website   new URL  http   www website com information asp    ReadableByteChannel rbc   Channels newChannel website openStream     FileOutputStream fos   new FileOutputStream  information html    fos getChannel   transferFrom rbc  0  Long MAX VALUE     Using transferFrom   is potentially much more efficient than a simple loop that reads from the source channel and writes to this channel  Many operating systems can transfer bytes directly from the source channel into the filesystem cache without actually copying them   Check more about it here   Note  The third parameter in transferFrom is the maximum number of bytes to transfer   Integer MAX VALUE will transfer at most 2 31 bytes  Long MAX VALUE will allow at most 2 63 bytes  larger than any file in existence

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Simpler nio usage   URL website   new URL  http   www website com information asp    try  InputStream in   website openStream          Files copy in  target  StandardCopyOption REPLACE EXISTING

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Below is the sample code to download movie from internet with java code       URL url   new  URL  http   103 66 178 220 ftp HDD2 Hindi 20Movies 2018 Hichki 202018 mkv        BufferedInputStream bufferedInputStream   new  BufferedInputStream url openStream         FileOutputStream stream   new FileOutputStream   home sachin Desktop test mkv          int count 0      byte   b1   new byte 100        while  count   bufferedInputStream read b1      -1            System out println  b1   b1   gt  gt   count    gt  gt  KB downloaded   new File   home sachin Desktop test mkv   length   1024           stream write b1  0  count

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If you are behind a proxy  you can set the proxies in java program as below           Properties systemSettings   System getProperties            systemSettings put  proxySet    true            systemSettings put  https proxyHost    https proxy of your org            systemSettings put  https proxyPort    8080      If you are not behind a proxy  don t include the lines above in your code  Full working code to download a file when you are behind a proxy   public static void main String   args  throws IOException           String url  https   raw githubusercontent com bpjoshi fxservice master src test java com bpjoshi fxservice api TradeControllerTest java           OutputStream outStream null          URLConnection connection null          InputStream is null          File targetFile null          URL server null            Setting up proxies         Properties systemSettings   System getProperties                systemSettings put  proxySet    true                systemSettings put  https proxyHost    https proxy of my organisation                systemSettings put  https proxyPort    8080                  The same way we could also set proxy for http             System setProperty  java net useSystemProxies    true                  code to fetch file         try               server new URL url               connection   server openConnection                is   connection getInputStream                byte   buffer   new byte is available                 is read buffer                    targetFile   new File  src main resources targetFile java                    outStream   new FileOutputStream targetFile                   outStream write buffer             catch  MalformedURLException e                System out println  THE URL IS NOT CORRECT                 e printStackTrace              catch  IOException e                System out println  Io exception                e printStackTrace                      finally              if outStream  null  outStream close

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When using Java 7  use the following method to download a file from the Internet and save it to some directory   private static Path download String sourceURL  String targetDirectory  throws IOException       URL url   new URL sourceURL       String fileName   sourceURL substring sourceURL lastIndexOf        1  sourceURL length         Path targetPath   new File targetDirectory   File separator   fileName  toPath        Files copy url openStream    targetPath  StandardCopyOption REPLACE EXISTING        return targetPath      Documentation here

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Personally  I ve found Apache s HttpClient to be more than capable of everything I ve needed to do with regards to this   Here is a great tutorial on using HttpClient

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This can read a file at the internet and write it into a file I hope this also helpful for you  import java net URL  import java io FileOutputStream  import java io File   public class Download       public static void main String   args  throws Exception            URL url   new URL  quot https   www google com images branding googlelogo 1x googlelogo color 272x92dp png quot        Input Url          FileOutputStream out   new FileOutputStream new File  quot out png quot                Output File          out write url openStream   readAllBytes              out close

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It s an old question but here is a concise  readable  JDK-only solution with properly closed resources  static long download String sourceUrl  String targetFileName  throws Exception       try  InputStream in   URI create sourceUrl  toURL   openStream              return Files copy in  Paths get targetFileName             Two lines of code and no dependencies  Here s a complete file downloader example program with output  error checking  and command line argument checks  package so downloader   import java io IOException  import java io InputStream  import java net MalformedURLException  import java net URI  import java nio file Files  import java nio file Paths   public class Application       public static void main String   args  throws MalformedURLException  IOException           if  2    args length                System out println String format  quot USAGE  java -jar so-downloader jar  lt source-URL gt   lt target-filename gt  quot                 System exit 1                      String sourceUrl   args 0           String targetFilename   args 1            long bytesDownloaded   download sourceUrl  targetFilename            System out println String format  quot Downloaded  d bytes from  s to  s  quot   bytesDownloaded  sourceUrl  targetFilename               static long download String sourceUrl  String targetFileName  throws MalformedURLException  IOException           try  InputStream in   URI create sourceUrl  toURL   openStream                  return Files copy in  Paths get targetFileName                        As noted in the so-downloader repository README  To run file download program  java -jar so-downloader jar  lt source-URL gt   lt target-filename gt   for example  java -jar so-downloader jar https   github com JanStureNielsen so-downloader archive main zip so-downloader-source zip

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This is another java7 variant based on Brian Risk s answer with usage of try-with statement   public static void downloadFileFromURL String urlString  File destination  throws Throwable          URL website   new URL urlString         try                ReadableByteChannel rbc   Channels newChannel website openStream                   FileOutputStream fos   new FileOutputStream destination                                fos getChannel   transferFrom rbc  0  Long MAX VALUE

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1st Method using the new channel  ReadableByteChannel aq   Channels newChannel new url  https  asd abc txt   openStream     FileOutputStream fileOS   new FileOutputStream  C Users local abc txt   FileChannel writech   fileOS getChannel      2nd Method using FileUtils  FileUtils copyURLToFile new url  https  asd abc txt  new local file on system  C   Users system abc txt       3rd Method using   InputStream xy   new   https  asd abc txt   openStream      This is how we can download file by using basic java code and other third-party libraries  These are just for quick reference  Please google with the above keywords to get detailed information and other options

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It s possible to download the file with with Apache s HttpComponents instead of Commons-IO  This code allows you to download a file in Java according to its URL and save it at the specific destination   public static boolean saveFile URL fileURL  String fileSavePath         boolean isSucceed   true       CloseableHttpClient httpClient   HttpClients createDefault         HttpGet httpGet   new HttpGet fileURL toString         httpGet addHeader  User-Agent    Mozilla 5 0  Windows NT 6 3  WOW64  rv 34 0  Gecko 20100101 Firefox 34 0        httpGet addHeader  Referer    https   www google com         try           CloseableHttpResponse httpResponse   httpClient execute httpGet           HttpEntity fileEntity   httpResponse getEntity             if  fileEntity    null                FileUtils copyInputStreamToFile fileEntity getContent    new File fileSavePath                     catch  IOException e            isSucceed   false             httpGet releaseConnection         return isSucceed      In contrast to the single line of code   FileUtils copyURLToFile fileURL  new File fileSavePath                           URLS FETCH TIMEOUT  URLS FETCH TIMEOUT     this code will give you more control over a process and let you specify not only time outs but User-Agent and Referer values  which are critical for many web-sites

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To summarize  and somehow polish and update  previous answers  The three following methods are practically equivalent   I added explicit timeouts because I think they are a must  nobody wants a download to freeze forever when the connection is lost    public static void saveUrl1 final Path file  final URL url     int secsConnectTimeout  int secsReadTimeout        throws MalformedURLException  IOException          Files createDirectories file getParent        optional  make sure parent dir exists     try  BufferedInputStream in   new BufferedInputStream         streamFromUrl url  secsConnectTimeout secsReadTimeout              OutputStream fout   Files newOutputStream file             final byte data     new byte 8192           int count          while  count   in read data    gt  0              fout write data  0  count            public static void saveUrl2 final Path file  final URL url     int secsConnectTimeout  int secsReadTimeout         throws MalformedURLException  IOException          Files createDirectories file getParent        optional  make sure parent dir exists     try  ReadableByteChannel rbc   Channels newChannel        streamFromUrl url  secsConnectTimeout secsReadTimeout                      FileChannel channel   FileChannel open file               StandardOpenOption CREATE                StandardOpenOption TRUNCATE EXISTING               StandardOpenOption WRITE                       channel transferFrom rbc  0  Long MAX VALUE            public static void saveUrl3 final Path file  final URL url      int secsConnectTimeout  int secsReadTimeout         throws MalformedURLException  IOException          Files createDirectories file getParent        optional  make sure parent dir exists     try  InputStream in   streamFromUrl url  secsConnectTimeout secsReadTimeout              Files copy in  file  StandardCopyOption REPLACE EXISTING            public static InputStream streamFromUrl URL url int secsConnectTimeout int secsReadTimeout  throws IOException       URLConnection conn   url openConnection        if secsConnectTimeout gt 0  conn setConnectTimeout secsConnectTimeout 1000       if secsReadTimeout gt 0  conn setReadTimeout secsReadTimeout 1000       return conn getInputStream        I don t find significant differences  all seem right to me  They are safe and efficient   Differences in speed seem hardly relevant - I write 180Mb from local server to a SSD disk in times that fluctuate around 1 2 to 1 5 segs   They don t require external libraries  All work with arbitrary sizes and  to my experience  HTTP redirections   Additionally  all throw FileNotFoundException if the resource is not found  error 404  typically   and java net UnknownHostException if the DNS resolution failed  other IOException correspond to errors during transmission    Marked as community wiki  feel free to add info or corrections

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Downloading a file requires you to read it  either way you will have to go through the file in some way   Instead of line by line  you can just read it by bytes from the stream   BufferedInputStream in   new BufferedInputStream new URL  http   www website com information asp   openStream        byte data     new byte 1024       int count      while  count   in read data 0 1024      -1                out write data  0  count

[java] How to download and save a file from Internet using Java?

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