You need to set it to true if you want to send (*output*) a request body, for example with POST or PUT requests. With GET, you do not usually send a body, so you do not need it.

Sending the request body itself is done via the connection&#39;s output stream:

    conn.getOutputStream().write(someBytes);

`setDoOutput(true)` is used for `POST` and `PUT` requests. If it is `false` then it is for using `GET` requests.

Adding a comment, if you have a long lasting connection and you send both GETs and POSTs, this is what I do:

    if (doGet) {	// some boolean
		con.setDoOutput(false);	// reset any previous setting, if con is long lasting
		con.setRequestMethod(&quot;GET&quot;);
	}
	else {
		con.setDoOutput(true);	// reset any previous setting, if con is long lasting
		con.setRequestMethod(&quot;POST&quot;);
	}
And to avoid making the connection long lasting, close it each time.

	if (doClose)	// some boolean
		con.setRequestProperty(&quot;Connection&quot;, &quot;close&quot;);

	con.connect();				// force connect request

    public void setDoOutput( boolean dooutput )

It takes a value as the parameter and sets this value of the `doOutput` field for this URLConnection to the specified value.

A URL connection can be used for input and/or output. Set the DoOutput flag to true if you intend to use the URL connection for output, false if not. The default is false. 

In this &quot;Hello World&quot; example:

    // Load the http module to create an http server.
    var http = require(&#39;http&#39;);

    // Configure our HTTP server to respond with Hello World to all requests.
    var server = http.createServer(function (request, response) {
      response.writeHead(200, {&quot;Content-Type&quot;: &quot;text/plain&quot;});
      response.end(&quot;Hello World\n&quot;);
    });

    // Listen on port 8000, IP defaults to 127.0.0.1
    server.listen(8000);

    // Put a friendly message on the terminal
    console.log(&quot;Server running at http://127.0.0.1:8000/&quot;);

How can I get the parameters from the query string?

    http://127.0.0.1:8000/status?name=ryan
In the documentation, they mentioned:

    node&gt; require(&#39;url&#39;).parse(&#39;/status?name=ryan&#39;, true)
    { href: &#39;/status?name=ryan&#39;
    , search: &#39;?name=ryan&#39;
    , query: { name: &#39;ryan&#39; }
    , pathname: &#39;/status&#39;
    }

But I did not understand how to use it. Could anyone explain?

Parsing Query String in node.js

I&#39;m looking to write a function that takes an array of pages/categories (from a flat database result) and generates an array of nested page/category items based on the parent ids. I would like to do this recursively, so that any level of nesting can be done.

For example: I&#39;m fetching all the pages in one query, and this is the what the database table looks like

    +-------+---------------+---------------------------+
    |   id  |   parent_id   |           title           |
    +-------+---------------+---------------------------+
    |   1   |       0       |   Parent Page             |
    |   2   |       1       |   Sub Page                |
    |   3   |       2       |   Sub Sub Page            |
    |   4   |       0       |   Another Parent Page     |
    +-------+---------------+---------------------------+
 

And this is the array I would like to end up with to process in my view files:

    Array
    (
        [0] =&gt; Array
    	    (
    			[id] =&gt; 1
    			[parent_id] =&gt; 0
    			[title] =&gt; Parent Page
    			[children] =&gt; Array
    						(
    							[0] =&gt; Array
    								(
    									[id] =&gt; 2
    									[parent_id] =&gt; 1
    									[title] =&gt; Sub Page
    									[children] =&gt; Array
    												(
    													[0] =&gt; Array
    														(
    															[id] =&gt; 3
    															[parent_id] =&gt; 1
    															[title] =&gt; Sub Sub Page
    														)
    												)
    								)
    						)
    	    )
    	[1] =&gt; Array
    		(
    			[id] =&gt; 4
    			[parent_id] =&gt; 0
    			[title] =&gt; Another Parent Page
    		)
    )


I&#39;ve looked and tried nearly every solution I&#39;ve come across (there&#39;s a lot of them here on Stack Overflow, but have had no luck getting something generic enough that will work for both pages and categories.

Here&#39;s the closest I&#39;ve gotten, but it doesn&#39;t work because I&#39;m assigning the children to the first level parent.

    function page_walk($array, $parent_id = FALSE)
    {	
    	$organized_pages = array();
	
    	$children = array();
	
    	foreach($array as $index =&gt; $page)
    	{
    		if ( $page[&#39;parent_id&#39;] == 0) // No, just spit it out and you&#39;re done
    		{
    			$organized_pages[$index] = $page;
    		}
    		else // If it does, 
    		{		
    			$organized_pages[$parent_id][&#39;children&#39;][$page[&#39;id&#39;]] = $this-&gt;page_walk($page, $parent_id);
    		}
    	}

    	return $organized_pages;
    }

    function page_list($array)
    {		
    	$fakepages = array();
    	$fakepages[0] = array(&#39;id&#39; =&gt; 1, &#39;parent_id&#39; =&gt; 0, &#39;title&#39; =&gt; &#39;Parent Page&#39;);
    	$fakepages[1] = array(&#39;id&#39; =&gt; 2, &#39;parent_id&#39; =&gt; 1, &#39;title&#39; =&gt; &#39;Sub Page&#39;);
    	$fakepages[2] = array(&#39;id&#39; =&gt; 3, &#39;parent_id&#39; =&gt; 2, &#39;title&#39; =&gt; &#39;Sub Sub Page&#39;);
    	$fakepages[3] = array(&#39;id&#39; =&gt; 4, &#39;parent_id&#39; =&gt; 3, &#39;title&#39; =&gt; &#39;Another Parent Page&#39;);
	
    	$pages = $this-&gt;page_walk($fakepages, 0);

    	print_r($pages);
    }

Recursive function to generate multidimensional array from database result

There&#39;s `setDoOutput()` in `URLConnection`. According to [documentation][1] I should 

&gt;Set the DoOutput flag to true if you intend to use the URL connection for output, false if not.

Now I&#39;m facing [exactly this problem][2] - the Java runtime converts the request to `POST` once `setDoOutput(true)` is called and the server only responds to `GET` requests. I want to understand what happens if I remove that `setDoOutput(true)` from the code.

What exactly will this affect? Suppose I set it to `false` - what can I do now and what can&#39;t I do now? Will I be able to perform `GET` requests? What is &quot;output&quot; in context of this method?


  [1]: http://docs.oracle.com/javase/1.5.0/docs/api/java/net/URLConnection.html#setDoOutput%28boolean%29
  [2]: http://webdiary.com/tag/httpurlconnection/

What exactly does URLConnection.setDoOutput() affect?

There's <code>setDoOutput()</code> in <code>URLConnection</code>. According to <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/net/URLConnection.html#setDoOutput%28boolean%29" target="_blank" rel="noopener noreferrer">documentation</a> I should
>Set the DoOutput flag to true if you intend to use the URL connection for output, false if not.
Now I'm facing <a href="http://webdiary.com/tag/httpurlconnection/" target="_blank" rel="noopener noreferrer">exactly this problem</a> - the Java runtime converts the request to <code>POST</code> once <code>setDoOutput(true)</code> is called and the server only responds to <code>GET</code> requests. I want to understand what happens if I remove that <code>setDoOutput(true)</code> from the code.
What exactly will this affect? Suppose I set it to <code>false</code> - what can I do now and what can't I do now? Will I be able to perform <code>GET</code> requests? What is "output" in context of this method?

I am working on a code for SOAP Web services, I would like to know the variations in SOAP 1.1, SOAP 1.2, HTTP GET &amp; HTTP POST methods for Android, and which is the preferred one among them. Please site out a sample of its usage URL or its code.

Thanks 

What is the difference between SOAP 1.1, SOAP 1.2, HTTP GET &amp; HTTP POST methods for Android?

    new SynchronousQueue()
    new LinkedBlockingQueue(1)

What is the difference? When I should use `SynchronousQueue` against `LinkedBlockingQueue` with capacity 1? 

When should I use SynchronousQueue over LinkedBlockingQueue

    try {
        // CompareRecord record = new CompareRecord();
        Connection conn = new CompareRecord().getConection(&quot;eliteddaprd&quot;,&quot;eliteddaprd&quot;,&quot;192.168.14.104&quot;,&quot;1521&quot;);
        ResultSet res = null;

        if (conn != null){
            Statement stmt = conn.createStatement();
            res = stmt.executeQuery(&quot;select rowindx,ADDRLINE1 from dedupinitial order by rowindx&quot;);
        }

        Map&lt;Integer,String&gt; adddressMap = new LinkedHashMap&lt;Integer, String&gt;();
        if (res != null){
            System.out.println(&quot;result set is not null &quot;);
            while(res.next()){
                adddressMap.put(res.getInt(1),res.getString(2));
            }
        }

        System.out.println(&quot;address Map size =========&gt; &quot;+adddressMap.size());
        Iterator it = adddressMap.entrySet().iterator();
        int count = 0;
        int min = 0;

        while (it.hasNext()){
            Map.Entry pairs = (Map.Entry)it.next();
            Pattern p = Pattern.compile(&quot;[,\\s]+&quot;);
            Integer outerkey = (Integer)pairs.getKey();
            String outerValue = (String)pairs.getValue();
            //System.out.println(&quot;outer Value ======&gt; &quot;+outerValue);

            String[] outerresult = p.split(outerValue);
            Map.Entry pairs2 = null;
            count++;
            List&lt;Integer&gt; dupList = new ArrayList&lt;Integer&gt;();

            Iterator innerit = adddressMap.entrySet().iterator();
            boolean first = true;

            while (innerit.hasNext()){
                //System.out.println(&quot;count value ===&gt; &quot;+count);
                int totmatch = 0;
                if(first){
                    if(count == adddressMap.size()){
                        break;
                    }
                    for(int i=0;i&lt;=count;i++){
                        pairs2 = (Map.Entry)innerit.next();
                    }
                    first  = false;
                }
                else{
                    pairs2 = (Map.Entry)innerit.next();
                }
                Integer innterKey = (Integer)pairs2.getKey();
                String innerValue = (String)pairs2.getValue();
                //System.out.println(&quot;innrer value &quot;+innerValue);
                String[] innerresult = p.split(innerValue);

                for(int j=0;j&lt;outerresult.length;j++){
                    for(int k=0;k&lt;innerresult.length;k++){
                        if(outerresult[j].equalsIgnoreCase(innerresult[k])){
                            //System.out.println(outerresult[j]+&quot; Match With &quot;+innerresult[k]);
                            totmatch++;
                            break;
                        }
                    }
                }

                min = Math.min(outerresult.length, innerresult.length);
                if(min != 0 &amp;&amp; ((totmatch*100)/min) &gt; 50) {
                    //System.out.println(&quot;maching inner key =========&gt; &quot;+innterKey);
                    dupList.add(innterKey);
                }
            }
            //System.out.println(&quot;Duplilcate List Sisze ===================&gt; &quot;+dupList.size()+&quot;   &quot;+outerkey);
        }

        System.out.println(&quot;End  =========&gt; &quot;+new Date());
    }
    catch (Exception e) {
        e.printStackTrace();
    }

Here ResultSet have processed around 500000 records, but it will give me error like:

    Exception in thread &quot;main&quot; java.lang.OutOfMemoryError: Java heap space
        at java.util.HashMap.resize(HashMap.java:508)
        at java.util.LinkedHashMap.addEntry(LinkedHashMap.java:406)
        at java.util.HashMap.put(HashMap.java:431)
        at spite.CompareRecord.main(CompareRecord.java:91)

I know this error comes because of VM memory, but don&#39;t know how to increase it in Eclipse?

What do I do if I have to process even more than 500,000 records?


Increasing heap space in Eclipse: (java.lang.OutOfMemoryError)

I heard that using `System.out.println` for logging purposes is a very bad practice and this may force the server to fail.

I don&#39;t use this approach but I am very interested in knowing why System.out.println could make so trash things when used in backend code.

Do not use System.out.println in server side code

I am using `ant-release` to do a 1-step build of my Android app.

My build.properties looks like this:

    application.package=xxxxx
    key.store=sonr
    key.alias=sonr labs
    key.store.password=xxxx
    key.alias.password=xxxx

When I run ant-release everything is fine except for application signing. I get the error:


    -release-prompt-for-password:
    
    -release-nosign:
         [echo] No key.store and key.alias properties found in build.properties.
         [echo] Please sign /Users/syalam/Documents/git/joeborn-sonr/sonr/bin/SONR-release-unsigned.apk manually
         [echo] and run zipalign from the Android SDK tools.
    [propertyfile] Updating property file: /Users/syalam/Documents/git/joeborn-sonr/sonr/bin/build.prop
    [propertyfile] Updating property file: /Users/syalam/Documents/git/joeborn-sonr/sonr/bin/build.prop
    [propertyfile] Updating property file: /Users/syalam/Documents/git/joeborn-sonr/sonr/bin/build.prop
    [propertyfile] Updating property file: /Users/syalam/Documents/git/joeborn-sonr/sonr/bin/build.prop

How can I resolve this?

PS. I followed this tutorial for getting my build process down http://www.androidengineer.com/2010/06/using-ant-to-automate-building-android.html



No key.store and key.alias properties found in build.properties

At the moment I would like to reinstall Android on my device(custom hardware device). I got the image files after building. But when I enter `fastboot devices` nothing returns. 

`adb devices` is working. It return my device. `fastboot flashall -w` is also not working. I returns `&lt;waiting for devices&gt;` and stays like that until I exit.

So the 70-android.rules.d file is right. I have also set ANDROID_PRODUCT_OUT. `But someone knows why fastboot does not see my device, but adb does?`

Restarting udev or adb does not work. Some people recommend that on the internet.

OS: Ubuntu 11.10

Android Fastboot devices not returning device

Suppose I have a full path of file like:(/sdcard/tlogo.png).  I want to know its mime type.

I created a function for it 

    public static String getMimeType(File file, Context context)	
	{
		Uri uri = Uri.fromFile(file);
		ContentResolver cR = context.getContentResolver();
		MimeTypeMap mime = MimeTypeMap.getSingleton();
		String type = mime.getExtensionFromMimeType(cR.getType(uri));
		return type;
	}

but when i call it, it returns null.

    File file = new File(filePath);
	String fileType=CommonFunctions.getMimeType(file, context);

How to determine MIME type of file in android?

I am implementing ActionBar to set the color for text using this style script in xml but getting error when I run my application time does anybody have idea what I have missing

this is my style.xml file

    &lt;!-- Start with the Holographic Light theme --&gt;
    &lt;style name=&quot;Theme.IOSched&quot; parent=&quot;android:style/Theme.Holo.Light&quot;&gt;
        &lt;item name=&quot;android:windowBackground&quot;&gt;@drawable/window_background&lt;/item&gt;
        &lt;item name=&quot;android:actionBarStyle&quot;&gt;@style/ActionBar&lt;/item&gt;

        &lt;!-- custom attributes 
        &lt;item name=&quot;textHeaderMaxLines&quot;&gt;@integer/text_header_max_lines&lt;/item&gt;
        &lt;item name=&quot;trackAbstractMaxLines&quot;&gt;@integer/track_abstract_max_lines&lt;/item&gt;--&gt;
    &lt;/style&gt;

    &lt;style name=&quot;Theme.IOSched.Home&quot; parent=&quot;style/Theme.IOSched&quot;&gt;
        &lt;item name=&quot;android:windowBackground&quot;&gt;@drawable/window_background_home&lt;/item&gt;
        &lt;item name=&quot;android:actionBarStyle&quot;&gt;@style/ActionBar&lt;/item&gt;
    &lt;/style&gt;

    &lt;style name=&quot;ActionBar&quot; parent=&quot;android:style/Widget.Holo.Light.ActionBar&quot;&gt;
        &lt;item name=&quot;android:background&quot;&gt;@color/actionbar_background&lt;/item&gt;
        &lt;item name=&quot;android:textColor&quot;&gt;@color/accent_1&lt;/item&gt;
        &lt;item name=&quot;android:titleTextStyle&quot;&gt;@style/ActionBarText&lt;/item&gt;
    &lt;/style&gt;

    &lt;style name=&quot;ActionBarText&quot; parent=&quot;@android:style/TextAppearance.Holo.Widget.ActionBar.Title&quot;&gt; &lt;!-- getting here error--&gt;
        &lt;item name=&quot;android:textColor&quot;&gt;@color/accent_1&lt;/item&gt;
        &lt;item name=&quot;android:textStyle&quot;&gt;bold&lt;/item&gt;
    &lt;/style&gt;

    error: Error retrieving parent for item: No resource found that matches the given name &#39;@android:style/TextAppearance.Holo.Widget.ActionBar.Title&#39;.

Error retrieving parent for item: No resource found that matches the given name &#39;@android:style/TextAppearance.Holo.Widget.ActionBar.Title&#39;

I can&#39;t export signed or unsigned application package

    *Export Aborted
    Export aborted because fatal Lin error were founds. These are listed in the
    problems view. Either fix these before running Export Again, or turn off &quot;Run
    full error check when exporting app&quot; in the Android &gt; Lint Error Cheking preference page.*

----

**Solution**:

    Window&gt;Preferences&gt;Android&gt;Lint Error Checking
    
    uncheck Run full error check when exporting app

Android Export aborted because fatal error were founds

I am using &lt;code&gt;HTTPURLConnection&lt;/code&gt; to connect to a web service. I know how to use &lt;code&gt;HTTPURLConnection&lt;/code&gt; but I want to understand how it works. Basically, I want to know the following:

 - On which point does &lt;code&gt;HTTPURLConnection&lt;/code&gt; try to establish a connection to the given URL?
 - On which point can I know that I was able to successfully establish a connection?
 - Are establishing a connection and sending the actual request done in one step/method call? What method is it?
 - Can you explain the function of &lt;code&gt;getOutputStream&lt;/code&gt; and &lt;code&gt;getInputStream&lt;/code&gt; in layman&#39;s term? I notice that when the server I&#39;m trying to connect to is down, I get an &lt;code&gt;Exception&lt;/code&gt; at &lt;code&gt;getOutputStream&lt;/code&gt;. Does it mean that &lt;code&gt;HTTPURLConnection&lt;/code&gt; will only start to establish a connection when I invoke &lt;code&gt;getOutputStream&lt;/code&gt;? How about the &lt;code&gt;getInputStream&lt;/code&gt;? Since I&#39;m only able to get the response at &lt;code&gt;getInputStream&lt;/code&gt;, then does it mean that I didn&#39;t send any request at &lt;code&gt;getOutputStream&lt;/code&gt; yet but simply establishes a connection? Do &lt;code&gt;HttpURLConnection&lt;/code&gt; go back to the server to request for response when I invoke &lt;code&gt;getInputStream&lt;/code&gt;?
 - Am I correct to say that &lt;code&gt;openConnection&lt;/code&gt; simply creates a new connection object but does not establish any connection yet?
 - How can I measure the read overhead and connect overhead?

Content Type	Original Author	Original Content on Stackoverflow
Question	sharptooth	View Question on Stackoverflow
Solution 1 - Java	Thilo	View Answer on Stackoverflow
Solution 2 - Java	Petar Minchev	View Answer on Stackoverflow
Solution 3 - Java	SoloPilot	View Answer on Stackoverflow
Solution 4 - Java	Mithun Sasidharan	View Answer on Stackoverflow

What exactly does URLConnection.setDoOutput() affect?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Recursive function to generate multidimensional array from database result

Parsing Query String in node.js

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