PHP ʖ²ἯTH º󍋼/A XLVII. PHP / Java Integration ½鉜 There are two possible ways to bridge PHP and Java: you can either integrate PHP into a Java Servlet environment, which is the more stable and efficient solution, or integrate Java support into PHP. The former is provided by a SAPI module that interfaces with the Servlet server, the latter by this Java extension. The Java extension provides a simple and effective means for creating and invoking methods on Java objects from PHP. The JVM is created using JNI, and everything runs in-process. ¾¯¸漯B Шdz You need a Java VM installed on your machine to use this extension. °²װ Note to Win32 Users: In order to enable this module on a Windows environment, you must copy jvm.dll from the DLL folder of the PHP/Win32 binary package to the SYSTEM32 folder of your windows machine. (Ex:C:\WINNT\SYSTEM32 or C:\WINDOWS\SYSTEM32) ԋАʱŤփ բЩº¯ʽµĐЎªʜµ½ȫ¾ּA HREF="configuration.html#configuration.file" Ťփ΄¼þ php.ini µē°Ϭ¡£ Name Default Changeable java.class.path NULL PHP_INI_ALL java.home NULL PHP_INI_ALL java.library.path NULL PHP_INI_ALL java.library JAVALIB PHP_INI_ALL ׊Դ Ѝ ¸À©չģ¿鎴¶¨ҥȎºΗʔ´ Ѝ¡£ Ԥ¶¨ҥ³£ ·¶= =ד 1. Java Example ?php // get instance of Java class java.lang.System in PHP $system = new Java('java.lang.System'); // demonstrate property access print 'Java version='.$system- getProperty('java.version').' br '; print 'Java vendor=' .$system- getProperty('java.vendor').' br '; print 'OS='.$system- getProperty('os.name').' '. $system- getProperty('os.version').' on '. $system- getProperty('os.arch').' br '; // java.util.Date example $formatter = new Java('java.text.SimpleDateFormat', "EEEE, MMMM dd, yyyy 'at' h:mm:ss a zzzz"); print $formatter- format(new Java('java.util.Date'));? =ד 2. AWT Example ?php // This example is only intented to be run as a CGI. $frame = new Java('java.awt.Frame', 'PHP'); $button = new Java('java.awt.Button', 'Hello Java World!'); $frame- add('North', $button); $frame- validate(); $frame- pack(); $frame- visible = True; $thread = new Java('java.lang.Thread'); $thread- sleep(10000); $frame- dispose();? new Java() will create an instance of a class if a suitable constructor is available. If no parameters are passed and the default constructor is useful as it provides access to classes like java.lang.System which expose most of their functionallity through static methods. Accessing a member of an instance will first look for bean properties then public fields. In other words, print $date.time will first attempt to be resolved as $date.getTime(), then as $date.time. Both static and instance members can be accessed on an object with the same syntax. Furthermore, if the java object is of type java.lang.Class, then static members of the class (fields and methods) can be accessed. Exceptions raised result in PHP warnings, and NULL results. The warnings may be eliminated by prefixing the method call with an "@" sign. The following APIs may be used to retrieve and reset the last error: java_last_exception_get() java_last_exception_clear() Overload resolution is in general a hard problem given the differences in types between the two languages. The PHP Java extension employs a simple, but fairly effective, metric for determining which overload is the best match. Additionally, method names in PHP are not case sensitive, potentially increasing the number of overloads to select from. Once a method is selected, the parameters are cooerced if necessary, possibly with a loss of data (example: double precision floating point numbers will be converted to boolean). In the tradition of PHP, arrays and hashtables may pretty much be used interchangably. Note that hashtables in PHP may only be indexed by integers or strings; and that arrays of primitive types in Java can not be sparse. Also note that these constructs are passed by value, so may be expensive in terms of memory and time. Java Servlet SAPI While this code is intended to be able to run on any servlet engine, it has only been tested on Apache's Jakarta/tomcat to date. Bug reports, success stories and/or patches required to get this code to run on other engines would be appreciated. PHP has a habit of changing the working directory. sapi/servlet will eventually change it back, but while PHP is running the servlet engine may not be able to load any classes from the CLASSPATH which are specified using a relative directory syntax, or find the work directory used for administration and JSP compilation tasks. Ŀ¼ java_last_exception_clear -- Clear last Java exception java_last_exception_get -- Get last Java exception º󍋼/A ưµ㼯A ircg_whois ɏһ¼¶ java_last_exception_clear