If the question is this generic, answer would be generic as well so START CODING follow any online tutorial face some issues, gogle it, reslve it, Tada. Download Manager in Java. Download Project On Download Manager in Java for free. Here i am going to give short description on Project On Download Manager. Here we give complete Project On Download Manager including the documentation part. This projects can be used for your semester exams.
This is a free Internet Download Manager Application for PC developed in java and free to use. It isvery light weight with size only below 50KB. This download manager allows pause and resume for downloads and requires java jre 1.8 to run. The program source code is given below. This will help you to understand how to download files from internet using java. The program may help you to understand how to pause and resume downloads in a java program. The application also provides drag and drop support. You can drag a link to file to be downloaded from browser in to the drag and drop area (drop target) in the application and it will automatically start download or add to the download queue. This will also help you study how to use Drag and Drop and how to set a drop target.
Download free Download Manager Application for Computer
You may download the lightweight java Download Manager Software from following link:
https://drive.google.com/file/d/0B5WYaNmq5rbueUl5bW03VllIc2M/view?usp=sharing
View Source code
Android/Java download manager library help you to download files in parallel mechanism in some chunks.
This library is a download manager android/java library which developers can use in their apps and allow you to download files in parallel mechanism in some chunks and notify developers about tasks status (any download file process is a task). Each download task cross 6 stats in its lifetime.
- init
- ready
- downloading
- paused
- download finished
- end
In the first stage, you need to include these permissions in your AndroidManifest.xml
file
After that, import com.golshadi.downloadManager package in your packages folder. So now everything is ready to start.
One of the important benefits of this lib is that you don't need to initialize object completely before getting any reports.
to get report about tasks you can use these methods that will be introduced later on this doc:
Attention: in this documentation dm stands for DownloadManagerPro object
in order to download with this lib you need to set its basic configurations and give him a listener to poke you about tasks status.
- String saveFilePath: folder address that you want to save your completed download task in it.
- int maxChunk : number of maximum chunks. any task is divided into some chunks and download them in parallel. it's better not to define more than 16 chunks; but if you do it's set to 16 automatically.
- DownloadManagerListener listenerClass in this package an interface created to report developer download tasks status. this interface includes some abstract methods that will be introduced later.
Example:
there are three ways to define your download task, so you can define it any way you want. for example If you didn't set maximum chunks number or sd card folder address it uses your initialized values. these methods return you a task id that you can call to start or pause that task using this token.
String saveName: defining te name of desired download file.
String url : Location of desired downlaod file.
int chunk : Number of chunks which download file has been divided into.
String sdCardFolder : Location of where user want to save the file.
boolean overwrite : Overwrite if exists another file with the same name. If true, overwrite and replace the file. If false, find new name and save it with new name.
boolean priority : Grant priority to more desired files to be downloaded.
return int task id: task token
Example:
this method usage is to start a download task. If download task doesn't get started since this task is in downloading state, it throw you an IOException. When download task start to download this lib notify you with OnDownloadStarted interface
- int token: It is an assigned token to each new download which is considered as download task id.
Example:
pause a download tasks that you mention and when that task paused this lib notify you with OnDownloadPaused interface
- int token: It is an assigned token to each new download which is considered as download task id.
Example:
StartQueueDownload method create a queue sort on what you want and start download queue tasks with downloadTaskPerTime number simultaneously. If download tasks are running in queue and you try to start it again it throws a QueueDownloadInProgressException exception.
int downloadTaskPerTime: the number of task that can be downloaded simultaneously
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int sortType: Grant priority to more desired files to be downloaded.
QueueSort.HighPriority : only high priority
QueueSort.LowPriority : only low priority
QueueSort.HighToLowPriority : sort queue from high to low priority
QueueSort.LowToHighPriority : sort queue from low to high priority
QueueSort.earlierFirst : sort queue from earlier to oldest tasks
QueueSort.oldestFirst : sort queue from old to earlier tasks
Example:
this method pauses queue download and if no queue download was started it throws a QueueDownloadNotStartedException exception.
Example:
In this section we are working with reports since we need to get tasks status and some useful information about those status.
It reports task download information in 'ReportStructure' style using a token (download task id) and finally returns the statue of that token.
int token: task token
return ReportStructure object and it has a method to convert these info to json
int id: task token
String name: file name that will be saved on your sdCard
int state: download state number
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String url: file download link
long fileSize: downloaded bytes
boolean resumable: download link is resumable or not
String type: file MIME
int chunks: task chunks number
double percent: downloaded file percent
long downloadLength: size that will get from your sd card after it completely download
String saveAddress: save file address
boolean priority: true if task was high priority
Example:
It's a report method for returning the list of download task in same state that developers want.
- int state: any download in it's life time across 6 state.
- TaskState.INIT: task intruduce for library and gave you token back but it didn't started yet.
- TaskState.READY: download task data fetch from its URL and it's ready to start.
- TaskState.DOWNLOADING: download task in downloading process.
- TaskState.PAUSED: download task in puase state. If in middle of downloading process internet disconnected; task goes to puase state and you can start it later
- TaskState.DOWNLOAD_FINISHED: download task downloaded completely but their chunks did not rebuild.
- TaskState.END: after rebuild download task chunks, task goes to this state and notified developer with OnDownloadCompleted(long taskToken) interface
Example:
This method returns list of last completed Download tasks in 'ReportStructure' style, developers can use it for notifying whether the task is completed or not.
- return List : list of completed download from last called unNotifiedCheck() method till now.
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Example:
This method checks all un notified tasks, so in another 'lastCompletedDownloads' call ,completed task does not show up again. 'lastCompletedDownloads': Shows the list of latest completed downloads. Calling this method, all of the tasks that were shown in the previous report, will be eliminated from 'lastCompletedDownloads'
Java Download Manager Tutorial
Example:
this method delete download task
- int token: download task token
- boolean deleteTaskFile: deletes download task from database and set deleteTaskFile as true, then it goes to saved folder and delete that file.
*return boolean : if delete is successfully it returns true otherwise false
Example:
This method closes database connection.
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Example: