Der Blog von Benny Neugebauer » JEE http://www.bennyn.de Alles über die Informatik & Co. Mon, 21 May 2012 16:07:42 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 Dynamically include files in JSP http://www.bennyn.de/programmierung/java/dynamically-include-files-in-jsp.html http://www.bennyn.de/programmierung/java/dynamically-include-files-in-jsp.html#comments Thu, 26 Apr 2012 13:55:03 +0000 bennyn http://www.bennyn.de/?p=3503 This is a good example to dynamically include a header file in JavaServer Pages (JSP):

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>        
  <c:set var="userAgent" scope="page" value="${header['User-Agent']}"/>
  <c:choose>
    <c:when test="${fn:contains(userAgent,'iPhone')}">
      <%@include file="header_iphone.jsp" %>
    </c:when>
    <c:when test="${fn:contains(userAgent,'iPad')}">
      <%@include file="header_ipad.jsp" %>
    </c:when>
    <c:when test="${fn:contains(userAgent,'Android')}">
      <%@include file="header_android.jsp" %>
    </c:when>
    <c:otherwise>
      <%@include file="header_other.jsp" %>
    </c:otherwise>
  </c:choose>
</body>
</html>
]]> http://www.bennyn.de/programmierung/java/dynamically-include-files-in-jsp.html/feed 0 Get user agent in JSP http://www.bennyn.de/programmierung/java/get-user-agent-in-jsp.html http://www.bennyn.de/programmierung/java/get-user-agent-in-jsp.html#comments Tue, 24 Apr 2012 12:31:18 +0000 bennyn http://www.bennyn.de/?p=3492 This is how you can show the user agent in JavaServer Pages (JSP):

Version 1

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>
    <%
      String userAgent = request.getHeader("user-agent");
      out.print(userAgent);
    %>
  </body>
</html>

Version 2

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>
    <%
      String userAgent = request.getHeader("user-agent");
    %>
    <%= userAgent %>
  </body>
</html>

Version 3

<%@taglib uri='http://java.sun.com/jsp/jstl/core' prefix='c'%>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>
  <c:out value="${header['User-Agent']}" />
</body>
</html>

Version 4

<%@taglib uri='http://java.sun.com/jsp/jstl/core' prefix='c'%>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>
  <c:set var="userAgent" scope="page" value="${header['User-Agent']}"/>
  <c:out value="${userAgent}" />
</body>
</html>

Version 5

<%@taglib uri='http://java.sun.com/jsp/jstl/core' prefix='c'%>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>JSP Page</title>
  </head>
  <body>
  <c:set var="userAgent" scope="page" value="${header['User-Agent']}"/>
  <%=pageContext.getAttribute("userAgent")%>
</body>
</html>
]]> http://www.bennyn.de/programmierung/java/get-user-agent-in-jsp.html/feed 0 IndexOutOfBoundsException with Catalina SSI Servlet http://www.bennyn.de/programmierung/java/indexoutofboundsexception-with-catalina-ssi-servlet.html http://www.bennyn.de/programmierung/java/indexoutofboundsexception-with-catalina-ssi-servlet.html#comments Fri, 13 Apr 2012 13:35:47 +0000 bennyn http://www.bennyn.de/?p=3422 I played around with some Server Side Includes using org.apache.catalina.ssi.SSIServlet and noticed that some statements (which were fine on Apache) are not working on GlassFish. Finally I found the solution.

In Apache (using mod_ssi) you can do this:

<!--#if expr="{$HTTP_USER_AGENT} == /(iPhone)/" -->
<p>It's an iPhone.</p>
<!--#endif -->

But on GlassFish Server (with SSIServlet) you have to do this:

<!--#if expr="{$HTTP_USER_AGENT} = '/(iPad)/'" -->
<p>It's an iPhone.</p>
<!--#endif -->
]]> http://www.bennyn.de/programmierung/java/indexoutofboundsexception-with-catalina-ssi-servlet.html/feed 0 Minify and obfuscate code with Maven http://www.bennyn.de/programmierung/java/minify-and-obfuscate-code-with-maven.html http://www.bennyn.de/programmierung/java/minify-and-obfuscate-code-with-maven.html#comments Tue, 10 Apr 2012 09:41:15 +0000 bennyn http://www.bennyn.de/?p=3403 In a production site you always want to have minified and obfuscated code (i.e. CSS and JavaScript files) so that the file content is as small as possible because this will save bandwidth and loading time. The best known and easiest tool for this is the YUI Compressor from Yahoo!.

In a Java Enterprise application, the YUI Compressor can be integrated very easy with Maven. All you need is the Maven Minify Plugin. That’s how to use it:

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>de.bennyn.examples</groupId>
  <artifactId>mavenproject1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <name>mavenproject1</name>
  <properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <version>6.0</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.3.2</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
          <compilerArguments>
            <endorseddirs>${endorsed.dir}</endorseddirs>
          </compilerArguments>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1.1</version>
        <configuration>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>2.1</version>
        <executions>
          <execution>
            <phase>validate</phase>
            <goals>
              <goal>copy</goal>
            </goals>
            <configuration>
              <outputDirectory>${endorsed.dir}</outputDirectory>
              <silent>true</silent>
              <artifactItems>
                <artifactItem>
                  <groupId>javax</groupId>
                  <artifactId>javaee-endorsed-api</artifactId>
                  <version>6.0</version>
                  <type>jar</type>
                </artifactItem>
              </artifactItems>
            </configuration>
          </execution>
        </executions>
      </plugin>
 
      <!-- Maven Minify Plugin -->
      <plugin>
        <groupId>com.samaxes.maven</groupId>
        <artifactId>maven-minify-plugin</artifactId>
        <version>1.3.5</version>
        <executions>
          <execution>
            <id>default-minify</id>
            <phase>process-resources</phase>
            <configuration>
              <cssSourceDir>css</cssSourceDir>
              <cssSourceFiles>
                <cssSourceFile>style.css</cssSourceFile>
              </cssSourceFiles>
              <cssFinalFile>my-styles.css</cssFinalFile>
              <jsSourceDir>js</jsSourceDir>
              <jsSourceFiles>
                <jsSourceFile>timer-singleton.js</jsSourceFile>
              </jsSourceFiles>
              <jsFinalFile>my-scripts.js</jsFinalFile>
            </configuration>
            <goals>
              <goal>minify</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
 
    </plugins>
  </build>
</project>

index.jsp

<html>
  <head>
    <title>JSP Page</title>
    <link href="./css/my-styles.min.css" rel="stylesheet" type="text/css" />
    <script src="./js/my-scripts.min.js" type="text/javascript"></script>
  </head>
  <body>
    <h1>Benny is here!</h1>
  </body>
</html>
]]> http://www.bennyn.de/programmierung/java/minify-and-obfuscate-code-with-maven.html/feed 0 For and foreach loop example in Java http://www.bennyn.de/programmierung/java/for-and-foreach-loop-example-in-java.html http://www.bennyn.de/programmierung/java/for-and-foreach-loop-example-in-java.html#comments Wed, 04 Apr 2012 20:27:36 +0000 bennyn http://www.bennyn.de/?p=3365 
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public static void main(String[] args)
{
  String[] firstNames =
  {
    "Marge", "Homer", "Lisa", "Bart", "Maggie"
  };
 
  System.out.println("- With for loop:");
 
  for (int i = 0; i < firstNames.length; i++)
  {
    System.out.println(firstNames[i]);
  }
 
  System.out.println("- With foreach loop");
 
  for (String name : firstNames)
  {
    System.out.println(name);
  }
}
]]> http://www.bennyn.de/programmierung/java/for-and-foreach-loop-example-in-java.html/feed 0