Javaâ¢ Application Development on Linux - Dator

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134Chapter 5The Sun Microsystems Java Software <strong>Development</strong> KitExample 5.8 Header file for GetUser native methods (GetUser.h)/* DO NOT EDIT THIS FILE - it is machine generated */#include /* Header for class GetUser */#ifndef _Included_GetUser#define _Included_GetUser#ifdef __cplusplusextern "C" {#endif/** Class: GetUser* Method: getUserName* Signature: ()Ljava/lang/String;*/JNIEXPORT jstring JNICALL Java_GetUser_getUserName(JNIEnv *, jobject);#ifdef __cplusplus}#endif#endifExample 5.9 Native method’s C implementation file (GetUser.c)#include "GetUser.h"#include JNIEXPORT jstring JNICALLJava_GetUser_getUserName(JNIEnv *jenv, jobject obj){char buffer[L_cuserid + 1];cuserid(buffer);}return (*jenv)->NewStringUTF(jenv, buffer);All of the Java class member data and Java class methods may be reachedthrough the JNIEnv pointer argument. There are also methods provided byJNI itself. One of those is NewStringUTF(). Remember that Java Strings areUnicode, not 8-bit ASCII, so you must convert to and from Unicode (UTF-8
5.7 Going Native135is an 8-bit encoding for Unicode that coincides with ASCII in the low 7 bits,so it is often used for such conversions). You can think of the JNIEnv as a C++class pointer, or you can think of it as a structure of data and function pointers(that’s really what a C++ class is, after all). The bottom line is, it provides themeans to access and manipulate the Java environment from your native code.The second argument, jobject, is the “this” pointer. It points to theGetUser class, and it is upcast to the JNI equivalent of the Java Objecttype. If our method took parameters, they would follow these two constantarguments.JNI is a huge topic. You can read more about it in the Sun MicrosystemsJNI Tutorial, 11 or in Java 2 SDK JNI FAQ, 12 or in the JNI 1.1 Specification, 13or in the associated JDK 1.2 Update 14 or the JDK 1.4 Update. 15Even with all of this “We’re too busy to explain things to you” going onhere, we’ve got a lot more to cover before we are done. The next step in ourlittle demo is to compile the C program and create a shared library of the code.$ cc -c GetUser.c$ cc -shared -o libgetuser.so GetUser.o$ export LD_LIBRARY_PATH=.The first line compiles the native method to a .o (object) file. The secondcommand makes a shared library out of it. Now, refer back to the static initializerin Example 5.7. A static initializer is run before everything else in a class,even before main(). In this case, it uses the loadLibrary() method of theSystem class to load the shared library we just created. Note that library namingrules of the target OS are applied. The library is named getuser and ona Linux system it is assumed that that library will be in a file namedlibgetuser.so.The last line sets an environment variable, LD_LIBRARY_PATH, to providea path where Java will search for libraries. This is behavior inherited from Solaris.Linux uses ldconfig to maintain a list of shared libraries. Usually, a libraryis placed in a directory named in the file ld.so.conf and a memory cache of11. http://java.sun.com/docs/books/tutorial/native1.1/index.html12. http://java.sun.com/products/jdk/faq/jni-j2sdk-faq.html13. http://java.sun.com/products/jdk/1.2/docs/guide/jni/spec/jniTOC.doc.html14. http://java.sun.com/j2se/1.4.1/docs/guide/jni/jni-12.html15. http://java.sun.com/j2se/1.4.1/docs/guide/jni/jni-14.html
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Java Application
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Java Application
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To my mother, for her love of words
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viiiContents1.41.51.6Chapter 22.12.
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xContents5.65.75.85.95.105.115.125.
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xiiContentsChapter 99.19.29.39.49.5
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xivContentsChapter 1313.113.213.313
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xviContentsChapter 1717.117.217.317
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xviiiContents20.620.720.820.920.102
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PrefaceJAVA AND LINUXWhy another bo
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PrefacexxiiiFREE SOFTWARE AND JAVAG
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Prefacexxvand Tyrrell Albaugh, who
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xxviiiIntroductionIf you are an exp
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xxxIntroductionThe Linux Newbie Pat
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Part IGetting Started
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4Chapter 1An Embarrassment of Riche
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10Chapter 1An Embarrassment of Rich
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Chapter 2An Embarrassment of Riches
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2.2 Eye to Eye with vi35of their co
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2.2 Eye to Eye with vi37• L (“l
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2.2 Eye to Eye with vi39In both cas
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2.2 Eye to Eye with vi41• :7,.w!
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2.2 Eye to Eye with vi431,$s/Tryout
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2.3 Editors Galore45affected by thi
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2.3 Editors Galore47has a huge lear
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2.6 Resources49• fte is an editor
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52Chapter 3An Experienced Programme
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7.5 Options and Switches1857.5OPTIO
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7.9 What You Still Don’t Know187o
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Chapter 8Know What You Have:CVSSour
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8.2 Source Control: Whys and Hows19
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8.3 A GUI: jCVS211and the differenc
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8.4 Review213Figure 8.7 jCVS checko
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Chapter 9Ant:An IntroductionAnt 1 i
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9.3 Obtaining and Installing Ant217
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9.3 Obtaining and Installing Ant219
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9.4 A Sample Ant Buildfile221standa
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9.4 A Sample Ant Buildfile2239.4.2.
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9.4 A Sample Ant Buildfile225$ antB
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9.4 A Sample Ant Buildfile227debugI
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9.4 A Sample Ant Buildfile229Exampl
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9.4 A Sample Ant Buildfile231Runnin
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9.7 Resources233• O’Reilly has
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236Chapter 10Integrated Dev
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Chapter 11Balancing Acts:An Imagina
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11.3 How to Develop Software265soft
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11.4 What Makes a Good Requirement2
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11.6 Requirements for the Budget <s
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11.6 Requirements for the Budget <s
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11.7 Documenting, Prototyping, and
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11.7 Documenting, Prototyping, and
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11.11 Exercises277• http://www.pr
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Chapter 12Analysis and Design:Seeki
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12.4 Finding the Objects281Accounta
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12.5 Finding the Methods and Attrib
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12.6 Essential and Nonessential285
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12.7 Analysis Paralysis287• Class
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12.12 Resources28912.9CORE CLASSESS
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12.12 Resources291if (dbConn != nul
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12.13 Exercises293Example 12.2 The
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296Chapter 13JUnit: Automating Unit
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Chapter 14Storing the DataIn this c
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14.5 Oracle, PostgreSQL, MySQL31714
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14.7 Beyond the Basics319files, and
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14.7 Beyond the Basics321Hibernate
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14.9 Setting Up PostgreSQL for Budg
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14.10 Review32514.9.4 Straight JDBC
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Chapter 15Accessing the Data:An Int
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15.3 Making Connections329These thr
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15.3 Making Connections331Example 1
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15.4 Querying Data333// queryString
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15.5 Getting Results335TIPThe case
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15.9 Resources337We haven’t cover
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Part IIIDevelopingGraphical User In
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342Chapter 16Getting in the Swing o
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378Chapter 17Other Ways: Alternativ
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Part IVDevelopingWeb Interfaces
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404Chapter 18Servlets: Java Pressed
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Chapter 19JSP:Servlets Turned Insid
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19.2 Servlets Turned Inside Out: JS
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19.3 How to Write a JSP App
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19.5 Review439into JSP files. The m
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19.8 Exercises441To get it straight
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444Chapter 20Open Source Web <stron
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Part VDevelopingEnterprise Scale So
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474Chapter 21Introduction to Enterp
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494Chapter 22Building an EJBclasses
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496Chapter 22Building an EJBwhich,
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498Chapter 22Building an EJBExample
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500Chapter 22Building an EJBExample
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502Chapter 22Building an EJBIf you
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Chapter 23Deploying EJBsIn this cha
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23.2 Lend Me Your EAR: Enterprise P
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23.3 Deploying the EAR515automatic
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23.4 Maintaining a Distributed <str
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23.8 Resources519Ant and CVS and ho
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522Chapter 24Parting ShotsThe three
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524Chapter 24Parting ShotsPrentice
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526Appendix AASCII ChartInt Oct Hex
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528Appendix BA Java Swing GUI for B
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Appendix CGNUGeneral Public License
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C.2 Terms and Conditions for Copyin
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C.2 Terms and Conditions for Copyin
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C.3 NO WARRANTY545of this License,
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C.5 How to Apply These Terms to You
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550Index$ (dollar)in format fields,
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552Indexbreak statement, 67, 74-75b
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554IndexCVS_RSH environment variabl
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556IndexFfail(), 307false constant,
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558IndexIBM, 236, 377, 518Common Pu
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560IndexJNDI (Java Naming and Direc
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562IndexNetBeans (continued)running
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564IndexScrollBar class, 385search
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566IndexTable class, 386, 394-395ta
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