Making gray background for code block in Blogger posts

You might want to have gray background for your code block to make it more readable as below.

> echo "Hello World!"

1. Go to your Blogger dashboard and click on Template then Edit HTML.
2. Add the following code above the </head> tag and save.

<style>
pre.codeblock {
   background:#E8E8E8;
}
</style>

3. Create a new post and add the following code.

<pre class="codeblock">
> echo "Hello World!"
</pre>

Downloading and Installing Jetty

Jetty is a web server and servlet container. In 2009, it moved its core components to the projects of Eclipse Foundation, in order to broaden licensing and community of the project.

Installation

1. Download the latest distribution here http://download.eclipse.org/jetty/
2. Extract the distribution file jetty-distribution-9.2.6.v20141205.zip, for example.
3. Start Jetty:

> cd jetty-distribution-9.2.6.v20141205
> java -jar start.jar
2015-01-02 20:51:35.971:INFO::main: Logging initialized @1044ms
2015-01-02 20:51:36.063:WARN:oejs.HomeBaseWarning:main: This instance of Jetty is not running from a separate {jetty.base} directory, this is not recommended.  See documentation at http://www.eclipse.org/jetty/documentation/current/startup.html
2015-01-02 20:51:36.351:INFO:oejs.Server:main: jetty-9.2.6.v20141205
2015-01-02 20:51:36.370:INFO:oejdp.ScanningAppProvider:main: Deployment monitor [file:/Users/vathanakmao/workspace/jetty-distribution-9.2.6.v20141205/webapps/] at interval 1
2015-01-02 20:51:36.424:INFO:oejs.ServerConnector:main: Started ServerConnector@69121bc1{HTTP/1.1}{0.0.0.0:8080}
2015-01-02 20:51:36.425:INFO:oejs.Server:main: Started @1497ms

4. Open browser and type http://localhost:8080/ You will see error 404 page below. It means Jetty is running but there is no any default page to serve. You can check in the jetty-distribution-9.2.6.v20141205/webapps directory. It's empty. In previous versions of Jetty, there are default page included.

Reference:
https://wiki.eclipse.org/Jetty/Tutorial

http://www.eclipse.org/jetty/documentation/current/quickstart-running-jetty.html

http://zetcode.com/java/jetty/introduction/

Searching for specific Blogger posts by label

Searching by a label

In the textbox located on a top navigation bar for the page, you can type label:java to search for posts with label java.

Or you can type one of the following URLs in browser. They are equivalent.

http://myt8chnote.blogspot.com/search?q=label%3Ajava
http://myt8chnote.blogspot.com/search/label/java





Searching by multiple labels

You can search for all posts with label java and all posts with label php by typing in the textbox:

label:java|label:php

Or access the following URL in browser:

http://myt8chnote.blogspot.com/search?q=label:java|label:php








Reference

http://www.mybloggertricks.com/2014/01/17-best-search-techniques-in-blogger.html





Highlighting source code in Blogger post

You might want to hightlight the source code in your post as below:

public void formatCode() {
   System.out.println("Hello World!");
}

We can do it using SyntaxHightlight javascript framework as following:

Note that If your blog is using Dynamic template, it does not work. It works with only Simple template. Blogger also allows you to switch template but make sure you backup the current template first.


1. Open your blog's template page

2. Click the Edit  HTML button to edit the template

3. Copy the following code and paste it above the </head> tag and then save the template

<link href="http://alexgorbatchev.com/pub/sh/current/styles/shCore.css" rel="stylesheet" type="text/css"></link>
<link href="http://alexgorbatchev.com/pub/sh/current/styles/shThemeDefault.css" rel="stylesheet" type="text/css"></link>
<script src="http://alexgorbatchev.com/pub/sh/current/scripts/shCore.js" type="text/javascript"/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushCSharp.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushCss.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushJava.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushJScript.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushPython.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushRuby.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushVb.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushPhp.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushCpp.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushPerl.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushSql.js' type='text/javascript'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushXml.js' type='text/javascript'/>
<script language='javascript'>
SyntaxHighlighter.config.bloggerMode = true;
SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/current/scripts/clipboard.swf';
SyntaxHighlighter.all();
</script>

Note that you can exclude some JS libs, for example shBrushVb.js, if you're not gonna use it so that you won't hurt the performance of the blog.

I had a problem with blogger that when my page was loading, it tried to download the javascript and css files using https protocol instead of http, in which the site does not support that so i downloaded those files and uploaded them to Dropbox and replace the domain alexgorbatchev.com with the dropbox domain.

4. Create a new post and click on HTML button and copy the code below and paste it there

<pre class="brush:java">
public void formatCode() {
   System.out.println("Hello World!");
}
</pre>

If it's XML code, you can use <pre class="brush:xml"> instead and you need to escape the html characters (for example, < or > ) first. You may use any online tools to do it such as http://www.bloggersentral.com/p/html-escape-tool.html


5. Now it will take effect for all new and existing posts but you can see the syntax hightlight for only the published posts and only when you're viewing them, not editing or previewing. As the owner, you can view the post from the following page:

Reference:
http://www.craftyfella.com/2010/01/syntax-highlighting-with-blogger-engine.html

Construct Amaon S3 object download URL

Syntax 1:

https://<bucket-region>.amazonaws.com/<bucket-name>/<object-id>

Assume we created the bucket mybucket with the region ap-southeast-1 and we upload the object with ID myfile.txt then the URL would be:

https://ap-southeast-1.amazonaws.com/mybucket/myfile.txt



Syntax 2:

https://<bucket-name>.s3.amazonaws.com/<object-id>


According to the example above, the URL would look like:

https://mybucket.s3.amazonaws.com/myfile.txt

Note that if the bucket name contains dot (.) character, you may encounter the following error when trying to get the object using RestTemplate class of Java Spring framework.

org.springframework.web.client.ResourceAccessException: I/O error on GET request for "https://gg.backend-test-ap-southeast-1.s3.amazonaws.com/portal/194/174120/products/1413876472.8028_14_o.jpg": java.security.cert.CertificateException: No subject alternative DNS name matching gg.backend-test-ap-southeast-1.s3.amazonaws.com found.; nested exception is javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative DNS name matching gg.backend-test-ap-southeast-1.s3.amazonaws.com found.

at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:525)

at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:473)

at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:261)

at com.goldengekko.mch.service.AmazonS3ManagerIntegrationTest.testPutObject(AmazonS3ManagerIntegrationTest.java:47)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative DNS name matching gg.backend-test-ap-southeast-1.s3.amazonaws.com found.

at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)

at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1884)

at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)

at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)

at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1341)

at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)

at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)

at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)

at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1016)

at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)

at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:563)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)

at org.springframework.http.client.SimpleBufferingClientHttpRtestPutObjectequest.executeInternal(SimpleBufferingClientHttpRequest.java:76)

at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)

at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:49)

at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:510)

... 26 more

Caused by: java.security.cert.CertificateException: No subject alternative DNS name matching gg.backend-test-ap-southeast-1.s3.amazonaws.com found.

at sun.security.util.HostnameChecker.matchDNS(HostnameChecker.java:191)

at sun.security.util.HostnameChecker.match(HostnameChecker.java:93)

at sun.security.ssl.X509TrustManagerImpl.checkIdentity(X509TrustManagerImpl.java:347)

at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:203)

at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)

at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)

... 40 more

Extract text from a string using Java regular expression

In the example below, you can extract the URL path from a complete URL:

String regex = "\\A(http://|https://)(.[^/]*)(.+)";
String url = "http://example.com/portal/194/174120/products/1413876472.8028_14_o.jpg";
Matcher matcher = Pattern.compile(regex).matcher(url);
if (matcher.find()) {
 String contextPath = matcher.group(3);
 return contextPath;
}

and the result is:

/portal/194/174120/products/1413876472.8028_14_o.jpg

Reference:
http://www.vogella.com/tutorials/JavaRegularExpressions/article.html

Guessing file content type

You can get file content type from a URL as following:

String fileUrl = "http://example.com/myimage.jpg";
String contentType = URLConnection.guessContentTypeFromName(fileUrl);

and the result would be:

image/jpeg

There is another method to guess file content type from input stream instead, URLConnection.guessContentTypeFromStream(InputStream) but if the server does not return content type of the file in the response header when you access it, the method would return null. Guessing content type from file name still work in this case.