The Linux Development Platform Configuring, Using, and ... - Classes

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CH09.fm Page 268 Monday, October 7, 2002 9:18 PM 268 Chapter 9 • Platform Independent Development with Java It is interesting to note that a non-blocking I/O library was available in the open source before it is included in SDK version 1.4. You can find more information about this open source implementation at http://www.cs.berkeley.edu/~mdw/proj/java-nbio/. 9.4.1.2 Security Enhancements Many new features have been added for security enhancements to the SDK and some existing features are refined. These features include Java Certification Path API, Cryptography, Java Authentication and Authorization Service security extensions, GSS-API with Kerberos support and so on. 9.4.1.3 Web Services J2SE version 1.4 lays foundation for XML-based web services. Now the XML is part of the core platform which allows building interoperable web applications and services. Different building blocks for Java platform standard edition version 1.4 are shown in Figure 9-1 taken from the Sun Microsystems web site. Figure 9-1 Building blocks of J2SE version 1.4.
CH09.fm Page 269 Monday, October 7, 2002 9:18 PM Java 2 SDK 269 9.4.2 Getting and Installing Java SDK from Sun You can download the current version from http://java.sun.com. The file is available as j2sdk-1_4_0-linux-i386-rpm.bin. The best way is to copy this file to a temporary directory and then install it from there. I have copied this file into the /download directory where the first step is to make it executable using the following command: chmod a+x j2sdk-1_4_0-linux-i386-rpm.bin Then you can execute this file just by typing in the following command: ./j2sdk-1_4_0-linux-i386-rpm.bin It will display the license agreement and you have to type in “yes” to agree to this license agreement. After that the self-extracting file will extract j2sdk-1_4_0-fcslinux-i386.rpm file that you can install using the rpm package with the help of the following command: rpm --install j2sdk-1_4_0-fcs-linux-i386.rpm If you have any previous version of SDK installed on your system, you should un-install it first. To list files installed by the rpm package, you can use the following command. rpm --query -l j2sdk-1.4.0-fcs|more By default, files are installed under the /usr/java/j2sdk1.4.0/ directory. The / usr/java/j2sdk1.4.0/bin directory contains all binary files for the SDK. 9.4.3 Creating jar Files The jar utility is used to create Java-class archives. It can take multiple class files, compress these and put them into a single .jar file. The syntax for using the jar utility is similar to the tar program widely used on Linux and other UNIX systems. The following command creates a file myclasses.jar from two class file first.class and second.class. jar cvf myclasses.jar first.class second.class You can also add or extract classes from the existing .jar files. The following command adds third.class to myclasses.jar archive. jar uf myclasses.jar third.class The following command will extract second.class from the myclasses.jar file. jar x second.class You can also use wild cards with the jar command. If you use directory names, all files in that directory are added to the .jar file. To list all files in a .jar file, use t command line option. The following command lists all files in myclasses.jar file. jar tf myclasses.jar
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