Learning the java language can be tough if you follow wrong documents. It's always best to follow the official tutorials provided by Oracle. They have provided all the Java Tutorials which are present on its website in ePub and mobi format.
You can download all of them at
http://www.oracle.com/technetwork/java/javase/java-tutorial-downloads-2005894.html
Check for the latest version of above page. Currently the link contains docs for Java8. It will prompt you the link for new version once later versions are released.
git command cheat sheet - short description
GIT command cheat sheet with short descriptions
Git task | Notes | Git commands |
---|---|---|
Tell Git who you are | Configure the author name and email address to be used with your commits.Note that Git strips some characters (for example trailing periods) from user.name. | git config --global user.name "Sam Smith" git config --global user.email sam@example.com |
Create a new local repository | git init | |
Check out a repository | Create a working copy of a local repository: | git clone /path/to/repository |
For a remote server, use: | git clone username@host:/path/to/repository | |
Add files | Add one or more files to staging (index): | git add <filename>git add * |
Commit | Commit changes to head (but not yet to the remote repository): | git commit -m "Commit message" |
Commit any files you've added with git add, and also commit any files you've changed since then: | git commit -a | |
Push | Send changes to the master branch of your remote repository: | git push origin master |
Status | List the files you've changed and those you still need to add or commit: | git status |
Connect to a remote repository | If you haven't connected your local repository to a remote server, add the server to be able to push to it: | git remote add origin <server> |
List all currently configured remote repositories: | git remote -v | |
Branches | Create a new branch and switch to it: | git checkout -b <branchname> |
Switch from one branch to another: | git checkout <branchname> | |
List all the branches in your repo, and also tell you what branch you're currently in: | git branch | |
Delete the feature branch: | git branch -d <branchname> | |
Push the branch to your remote repository, so others can use it: | git push origin <branchname> | |
Push all branches to your remote repository: | git push --all origin | |
Delete a branch on your remote repository: | git push origin :<branchname> | |
Update from the remote repository | Fetch and merge changes on the remote server to your working directory: | git pull |
To merge a different branch into your active branch: | git merge <branchname> | |
View all the merge conflicts:View the conflicts against the base file:Preview changes, before merging: | git diffgit diff --base <filename> git diff <sourcebranch> <targetbranch> |
|
After you have manually resolved any conflicts, you mark the changed file: | git add <filename> | |
Tags | You can use tagging to mark a significant changeset, such as a release: | git tag 1.0.0 <commitID> |
CommitId is the leading characters of the changeset ID, up to 10, but must be unique. Get the ID using: | git log | |
Push all tags to remote repository: | git push --tags origin | |
Undo local changes | If you mess up, you can replace the changes in your working tree with the last content in head:Changes already added to the index, as well as new files, will be kept. | git checkout -- <filename> |
Instead, to drop all your local changes and commits, fetch the latest history from the server and point your local master branch at it, do this: | git fetch origingit reset --hard origin/master | |
Search | Search the working directory for foo(): | git grep "foo()" |
Source:
https://www.atlassian.com/git/tutorials/svn-to-git-prepping-your-team-migration/basic-git-commands
linux terminal commands for beginner level
NAVIGATION
GETTING HELP
WORKING WITH FILES
TEXT FILES
USERS
CHANGING FILE PERMISSIONS
KILLING PROGRAMS AND LOGGING OUT
- ls - list directory contents
- pwd - print name of current/working directory
- cd - change working directory
- pushd/popd - put working directory on a stack
- file - determine file type
- locate - find files by name
- updatedb - update database for locate
- which - locate a command
- history - display bash command history
GETTING HELP
- whatis - display the on-line manual descriptions
- apropos - search the manual page names and descriptions
- man - an interface to the on-line reference manuals
WORKING WITH FILES
- mkdir - create a directory/make directories
- touch - change file timestamps/create empty files
- cp - copy files and directories
- mv - move (rename) files
- rm - remove files or directories
- rmdir - remove empty directories
TEXT FILES
- cat - concatenate files and print on the standard output
- more/less - page view
- nano - command line text editor
USERS
- sudo - execute a command as superuser
- su - change user ID or become another user
- users - print the user names of users currently logged in
- id - print real and effective user and group IDs
CHANGING FILE PERMISSIONS
- chmod - change permissions of a file
KILLING PROGRAMS AND LOGGING OUT
- Ctrl+C - kill a running command
- killall - kill processes by name
- exit - log out of bash
Maven use local jar without installing
You can install a local jar by using mvn install:install-file command/goal as I discussed in my earlier blog post. This ensures the re-usability of jar file across your projects but as a drawback, this requires every team member and build server to run the same command/goal to build their project.
To avoid to the manual hassle, you can add the .jar in pom.xml file without running the mvn install:install-file goal. The idea is to refer a .jar from your project base directory using the <systemPath> element.
In example below, I put my jar files to /myjars directory and point to the jar file as
/src/..
pom.xml
/myjars/my-lib-core.jar
/myjars/third-party.jar
Here we are asking maven-war-plugin to add all jar ( **/*.jar) from ${project.basedir}/myjars to WEB-INF/lib folder when creating the war file.
To avoid to the manual hassle, you can add the .jar in pom.xml file without running the mvn install:install-file goal. The idea is to refer a .jar from your project base directory using the <systemPath> element.
In example below, I put my jar files to /myjars directory and point to the jar file as
<systemPath>${project.basedir}/myjars/[Jar file name]</systemPath>
Directory Structure
../src/..
pom.xml
/myjars/my-lib-core.jar
/myjars/third-party.jar
Pom.xml
<dependencies> <dependency> <groupId>com.my.library</groupId> <artifactId>mylib-core</artifactId> <version>1.VERSION</version> <scope>system</scope> <systemPath>${project.basedir}/myjars/my-lib-core.jar</systemPath> </dependency>
<dependency> <groupId>com.third-party.library</groupId> <artifactId>thirdparty</artifactId> <version>1.VERSION</version> <scope>system</scope> <systemPath>${project.basedir}/myjars/third-party.jar</systemPath> </dependency>
For web project (war files )
If you are working on a web project, the above configuration won't add the jars to war file by default. You need to do following.Here we are asking maven-war-plugin to add all jar ( **/*.jar) from ${project.basedir}/myjars to WEB-INF/lib folder when creating the war file.
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <configuration> <warSourceDirectory>src/main/webapp/</warSourceDirectory> <webResources> <resource> <directory>${project.basedir}/myjars</directory> <targetPath>WEB-INF/lib</targetPath> <includes> <include>**/*.jar</include> </includes> </resource> </webResources> </configuration> </plugin> </plugins> </build>
Acoustic Alchemy - The Beautiful Game - Instrumental JAZZ
Acoustic Alchemy - The Beautiful Game - Instrumental JAZZ
Isn't it awesome ?
Catalina Kiss - Acoustic Alchemy - Instrumental JAZZ
Catalina Kiss - Acoustic Alchemy - Instrumental JAZZ
Here's another ...Enjoy !
Spring MVC download content of String as text file
To download a text file out of a String :
JSP View :
Check this as well : spring mvc download a file from server
JSP View :
<a href="download">Download String </a>
Controller Method :
@RequestMapping(value = "/download", method = RequestMethod.GET)
public @ResponseBody
void downloadFile(HttpServletResponse resp) {
String downloadFileName= "download.txt";
String downloadStringContent= getStringToWrite(); // implement this
try {
OutputStream out = resp.getOutputStream();
resp.setContentType("text/plain; charset=utf-8");
resp.addHeader("Content-Disposition","attachment; filename=\"" + downloadFileName + "\"");
out.write(downloadStringContent.getBytes(Charset.forName("UTF-8")));
out.flush();
out.close();
} catch (IOException e) {
}
}
Check this as well : spring mvc download a file from server
Spring MVC file download from server example code
To download a file - from request parameter
JSP View :
JSP View :
<a href="downloadFile?fileName=log.txt">Download String </a>
Controller Method :
@RequestMapping(value = "/downLoadFile", method = RequestMethod.GET)
public void downLoadFile( HttpServletRequest request, HttpServletResponse response ) {
try {
String fileName = request.getParameter( "fileName" );
File file = getFileToDownload(fileName) // implement this to return a valid file object
InputStream in = new BufferedInputStream( new FileInputStream( file ) );
response.setContentType( "text/plain" ); // define your type
response.setHeader( "Content-Disposition", "attachment; filename=" + fileName );
ServletOutputStream out = response.getOutputStream( );
IOUtils.copy( in, out ); //import org.apache.commons.io.IOUtils;
response.flushBuffer( );
} catch ( Exception e ) {
e.printStackTrace( );
}
}
Java - Convert HTML to PDF File - Using iText
Here's how you can convert HTML to PDF using iText and Flying Saucer PDF libraries in Java. The steps are described within the code below.
You can easily add some methods below to read HTML content from a file and convert the HTML file to PDF ( instead of HTML string to PDF).
You can easily add some methods below to read HTML content from a file and convert the HTML file to PDF ( instead of HTML string to PDF).
package g.t.test; import org.xhtmlrenderer.pdf.ITextRenderer; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; public class HtmlToPDFConverter { public static void convert(String htmlContent, File pdfFile) throws Exception { ByteArrayOutputStream os = new ByteArrayOutputStream(); //step1: render html to memory
ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(htmlContent);
renderer.layout();
renderer.createPDF(os);
//step2: conver to byte array stream
byte[] pdfAsBytes = os.toByteArray();
os.close();
//step3: write byte array stream to file
FileOutputStream fos = new FileOutputStream(pdfFile);
fos.write(pdfAsBytes);
fos.flush();
fos.close();
}
// let's test !!
public static void main(String[] args) throws Exception{
convert("<html> <body> " +
"<h1>Hello Crazy World !!</h1> <br/> " +
"<h2> I hope you are doing great.</h2> " +
"</body> </html>", new File("test.pdf"));
}
}
Used Maven Dependencies:
<dependency> <groupId>com.lowagie</groupId> <artifactId>itext</artifactId> <version>2.1.7</version> </dependency> <dependency> <groupId>org.xhtmlrenderer</groupId> <artifactId>flying-saucer-pdf</artifactId> <version>9.0.9</version> </dependency>
jQuery effects - jQuery basic tutorial 10
10. jQuery Effects
This tutorial covers all the important jQuery methods to create visual effects.
Showing and Hiding elements:
The commands for showing and hiding elements are pretty much what we would expect: show() to show the elements in a wrapped set and hide() to hide them.Syntax:
Here is the simple syntax for show() method:[selector].show( speed, [callback] );Here is the description of all the parameters:
-
speed: A string representing one of the three predefined
speeds ("slow", "normal", or "fast") or the number of milliseconds to
run the animation (e.g. 1000).
-
callback: This optional parameter represents a function to
be executed whenever the animation completes; executes once for each
element animated against.
[selector].hide( speed, [callback] ); |
-
speed: A string representing one of the three predefined
speeds ("slow", "normal", or "fast") or the number of milliseconds to
run the animation (e.g. 1000).
-
callback: This optional parameter represents a function to
be executed whenever the animation completes; executes once for each
element animated against.
Example:
Consider the following HTML file with a small JQuery coding:<html> <head> <title>the title</title> <script type="text/javascript" src="/jquery/jquery-1.3.2.min.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function() { $("#show").click(function () { $(".mydiv").show( 1000 ); }); $("#hide").click(function () { $(".mydiv").hide( 1000 ); }); }); </script> <style> .mydiv{ margin:10px;padding:12px; border:2px solid #666; width:100px; height:100px; } </style> </head> <body> <div class="mydiv"> This is SQUAR </div> <input id="hide" type="button" value="Hide" /> <input id="show" type="button" value="Show" /> </body> </html>
Toggling the elements:
jQuery provides methods to toggle the display state of elements between revealed or hidden. If the element is initially displayed, it will be hidden; if hidden, it will be shown.Syntax:
Here is the simple syntax for one of the toggle() methods:
[selector]..toggle([speed][, callback]); |
-
speed: A string representing one of the three predefined
speeds ("slow", "normal", or "fast") or the number of milliseconds to
run the animation (e.g. 1000).
-
callback: This optional parameter represents a function to
be executed whenever the animation completes; executes once for each
element animated against.
Example:
We can animate any element, such as a simple <div> containing an image:<html> <head> <title>the title</title> <script type="text/javascript" src="/jquery/jquery-1.3.2.min.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function() { $(".clickme").click(function(event){ $(".target").toggle('slow', function(){ $(".log").text('Transition Complete'); }); }); }); </script> <style> .clickme{ margin:10px;padding:12px; border:2px solid #666; width:100px; height:50px; } </style> </head> <body> <div class="content"> <div class="clickme">Click Me</div> <div class="target"> <img src="/images/jquery.jpg" alt="jQuery" /> </div> <div class="log"></div> </body> </html>
JQuery Effect Methods:
You have seen basic concept of jQuery Effects. Following table lists down all the important methods to create different kind of effects:Methods and Description |
---|
animate( params, [duration, easing, callback] ) A function for making custom animations. |
fadeIn( speed, [callback] ) Fade in all matched elements by adjusting their opacity and firing an optional callback after completion. |
fadeOut( speed, [callback] ) Fade out all matched elements by adjusting their opacity to 0, then setting display to "none" and firing an optional callback after completion. |
fadeTo( speed, opacity, callback ) Fade the opacity of all matched elements to a specified opacity and firing an optional callback after completion. |
hide( ) Hides each of the set of matched elements if they are shown. |
hide( speed, [callback] ) Hide all matched elements using a graceful animation and firing an optional callback after completion. |
show( ) Displays each of the set of matched elements if they are hidden. |
show( speed, [callback] ) Show all matched elements using a graceful animation and firing an optional callback after completion. |
slideDown( speed, [callback] ) Reveal all matched elements by adjusting their height and firing an optional callback after completion. |
slideToggle( speed, [callback] ) Toggle the visibility of all matched elements by adjusting their height and firing an optional callback after completion. |
slideUp( speed, [callback] ) Hide all matched elements by adjusting their height and firing an optional callback after completion. |
stop( [clearQueue, gotoEnd ]) Stops all the currently running animations on all the specified elements. |
toggle( ) Toggle displaying each of the set of matched elements. |
toggle( speed, [callback] ) Toggle displaying each of the set of matched elements using a graceful animation and firing an optional callback after completion. |
toggle( switch ) Toggle displaying each of the set of matched elements based upon the switch (true shows all elements, false hides all elements). |
jQuery.fx.off Globally disable all animations. |
jQuery and Ajax - jQuery basic tutorial 9
9. jQuery Ajax
If you are new with AJAX, I would recommend you go through our Ajax Tutorial before proceeding further.
JQuery is a great tool which provides a rich set of AJAX methods to develope next generation web application.
Loading simple data:
This is very easy to load any static or dynamic data using JQuery AJAX. JQuery provides load() method to do the job:Syntax:
Here is the simple syntax for load() method:[selector].load( URL, [data], [callback] );Here is the description of all the parameters:
-
URL: The URL of the server-side resource to which the
request is sent. It could be a CGI, ASP, JSP, or PHP script which
generates data dynamically or out of a database.
-
data: This optional parameter represents an object whose
properties are serialized into properly encoded parameters to be passed
to the request. If specified, the request is made using the POST method. If omitted, the GET method is used.
-
callback: A callback function invoked after the response
data has been loaded into the elements of the matched set. The first
parameter passed to this function is the response text recieved from the
server and second parameter is the status code.
Example:
Consider the following HTML file with a small JQuery coding:
<html> <head> <title>the title</title> <script type="text/javascript" src="/jquery/jquery-1.3.2.min.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function() { $("#driver").click(function(event){ $('#stage').load('/jquery/result.html'); }); }); </script> </head> <body> <p>Click on the button to load result.html file:</p> <div id="stage" style="background-color:blue;"> STAGE </div> <input type="button" id="driver" value="Load Data" /> </body> </html>
Here load() initiates an Ajax request to the specified URL /jquery/result.html file. After loading this file, all the content would be populated inside <div> tagged with ID stage. Assuming, our /jquery/result.html file has just one HTML line:
<h1>THIS IS RESULT...</h1>
Getting JSON data:
There would be a situation when server would return JSON string against your request. JQuery utility function getJSON() parses the returned JSON string and makes the resulting string available to the callback function as first parameter to take further action.
Syntax:
Here is the simple syntax for getJSON() method:
[selector].getJSON( URL, [data], [callback] ); Here is the description of all the parameters:
-
URL: The URL of the server-side resource contacted via the GET method.
-
data: An object whose properties serve as the name/value
pairs used to construct a query string to be appended to the URL, or a
preformatted and encoded query string.
-
callback: A function invoked when the request completes. The
data value resulting from digesting the response body as a JSON string
is passed as the first parameter to this callback, and the status as the
second.
Example:
Consider the following HTML file with a small JQuery coding:<html> <head> <title>the title</title> <script type="text/javascript" src="/jquery/jquery-1.3.2.min.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function() { $("#driver").click(function(event){ $.getJSON('/jquery/result.json', function(jd) { $('#stage').html('<p> Name: ' + jd.name + '</p>'); $('#stage').append('<p>Age : ' + jd.age+ '</p>'); $('#stage').append('<p> Sex: ' + jd.sex+ '</p>'); }); }); }); </script> </head> <body> <p>Click on the button to load result.html file:</p> <div id="stage" style="background-color:blue;"> STAGE </div> <input type="button" id="driver" value="Load Data" /> </body> </html>Here JQuery utility method getJSON() initiates an Ajax request to the specified URL /jquery/result.json file. After loading this file, all the content would be passed to the callback function which finally would be populated inside <div> tagged with ID stage. Assuming, our /jquery/result.json file has following json formatted content:
{ "name": "Zara Ali", "age" : "67", "sex": "female" } |
Passing data to the Server:
Many times you collect input from the user and you pass that input to the server for further processing. JQuery AJAX made it easy enough to pass collected data to the server using data parameter of any available Ajax method.Example:
This example demonstrate how can pass user input to a web server script which would send the same result back and we would print it:<html> <head> <title>the title</title> <script type="text/javascript" src="/jquery/jquery-1.3.2.min.js"></script> <script type="text/javascript" language="javascript"> $(document).ready(function() { $("#driver").click(function(event){ var name = $("#name").val(); $("#stage").load('/jquery/result.php', {"name":name} ); }); }); </script> </head> <body> <p>Enter your name and click on the button:</p> <input type="input" id="name" size="40" /><br /> <div id="stage" style="background-color:blue;"> STAGE </div> <input type="button" id="driver" value="Show Result" /> </body> </html>Here is the code written in result.php script:
<?php if( $_REQUEST["name"] ) { $name = $_REQUEST['name']; echo "Welcome ". $name; } ?>
jQuery Event handlers - jQuery basic tutorial 8
8. jQuery Event handlers
Following are the examples events:
- A mouse click
- A web page loading
- Taking mouse over an element
- Submitting an HTML form
- A keystroke on your keyboard
- etc.
Binding event handlers:
Using the jQuery Event Model, we can establish event handlers on DOM elements with the bind() method as follows:$('div').bind('click', function( event ){ alert('Hi there!'); }); selector.bind( eventType[, eventData], handler)Following is the description of the parameters:
-
eventType: A string containing a JavaScript event type, such
as click or submit. Refer to the next section for a complete list of
event types.
-
eventData: This is optional parameter is a map of data that will be passed to the event handler.
-
handler: A function to execute each time the event is triggered.
Removing event handlers:
Typically, once an event handler is established, it remains in effect for the remainder of the life of the page. There may be a need when you would like to remove event handler.jQuery provides the unbind() command to remove an exiting event handler. The syntax of unbind() is as follows:
selector.unbind(eventType, handler) or selector.unbind(eventType)Following is the description of the parameters:
-
eventType: A string containing a JavaScript event type, such
as click or submit. Refer to the next section for a complete list of
event types.
-
handler: If provided, identifies the specific listener that.s to be removed.
Event Types:
The following are cross platform and recommended event types which you can bind using JQuery:Event Type | Description |
---|---|
blur | Occurs when the element loses focus |
change | Occurs when the element changes |
click | Occurs when a mouse click |
dblclick | Occurs when a mouse double-click |
error | Occurs when there is an error in loading or unloading etc. |
focus | Occurs when the element gets focus |
keydown | Occurs when key is pressed |
keypress | Occurs when key is pressed and released |
keyup | Occurs when key is released |
load | Occurs when document is loaded |
mousedown | Occurs when mouse button is pressed |
mouseenter | Occurs when mouse enters in an element region |
mouseleave | Occurs when mouse leaves an element region |
mousemove | Occurs when mouse pointer moves |
mouseout | Occurs when mouse pointer moves out of an element |
mouseover | Occurs when mouse pointer moves over an element |
mouseup | Occurs when mouse button is released |
resize | Occurs when window is resized |
scroll | Occurs when window is scrolled |
select | Occurs when a text is selected |
submit | Occurs when form is submitted |
unload | Occurs when documents is unloaded |
The Event Object:
The callback function takes a single parameter; when the handler is called the JavaScript event object will be passed through it.The event object is often unneccessary and the parameter is omitted, as sufficient context is usually available when the handler is bound to know exactly what needs to be done when the handler is triggered, however there are certail attributes which you would need to be accessed.
The Event Attributes:
The following event properties/attributes are available and safe to access in a platform independent manner:Property | Description |
---|---|
altKey | Set to true if the Alt key was pressed when the event was triggered, false if not. The Alt key is labeled Option on most Mac keyboards. |
ctrlKey | Set to true if the Ctrl key was pressed when the event was triggered, false if not. |
data | The value, if any, passed as the second parameter to the bind() command when the handler was established. |
keyCode | For keyup and keydown events, this returns the key that was pressed. |
metaKey | Set to true if the Meta key was pressed when the event was triggered, false if not. The Meta key is the Ctrl key on PCs and the Command key on Macs. |
pageX | For mouse events, specifies the horizontal coordinate of the event relative from the page origin. |
pageY | For mouse events, specifies the vertical coordinate of the event relative from the page origin. |
relatedTarget | For some mouse events, identifies the element that the cursor left or entered when the event was triggered. |
screenX | For mouse events, specifies the horizontal coordinate of the event relative from the screen origin. |
screenY | For mouse events, specifies the vertical coordinate of the event relative from the screen origin. |
shiftKey | Set to true if the Shift key was pressed when the event was triggered, false if not. |
target | Identifies the element for which the event was triggered. |
timeStamp | The timestamp (in milliseconds) when the event was created. |
type | For all events, specifies the type of event that was triggered (for example, click). |
which | For keyboard events, specifies the numeric code for the key that caused the event, and for mouse events, specifies which button was pressed (1 for left, 2 for middle, 3 for right) |
The Event Methods:
There is a list of methods which can be called on an Event Object:Method | Description |
---|---|
preventDefault() | Prevents the browser from executing the default action. |
isDefaultPrevented() | Returns whether event.preventDefault() was ever called on this event object. |
stopPropagation() | Stops the bubbling of an event to parent elements, preventing any parent handlers from being notified of the event. |
isPropagationStopped() | Returns whether event.stopPropagation() was ever called on this event object. |
stopImmediatePropagation() | Stops the rest of the handlers from being executed. |
isImmediatePropagationStopped() | Returns whether event.stopImmediatePropagation() was ever called on this event object. |
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