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HomeBackend DevelopmentPHP TutorialThe powerful combination of PHP and Java Detailed explanation of integrated development of PHP and Java (1)_PHP tutorial

【php100独家特稿】很久以前,有人从www上看到看到天空上一个很亮的亮点,它就是Java语言,与此同时,在另一个地方一位梦想家也看到了一个亮点,它就是PHP。

时间一天天过去,这两个亮点也变得越来越亮,很快,它们受到了编程者的喜欢,于是有人有疑问了:要是它们两者相遇,会发生什么事情?有没有可能将它们的强项结合在一起呢?

尝试在PHP和Java之间搭建一座桥梁,利用这座桥梁在这两个实体之间建立起一个沟通渠道,在这座桥梁的帮助下,你可以在Java中开发类,然后在PHP中调用它们的方法,同样,在你的Java桌面或Web应用程序中也可以使用PHP脚本。

在这篇文章中,你将会学到如何:

◆安装和配置PHP/Java桥

◆在PHP脚本中使用Java类

◆在Java类中使用PHP脚本

◆在JSP页面中使用PHP脚本

那我们开始吧!

安装和配置PHP/Java桥

最新的PHP/Java桥zip包可在http://sourceforge.net/projects/php-java-bridge/下载到,安装过程依赖于选择哪个Java平台通过这座桥与PHP脚本交互。

◆对于J2SE,安装非常简单:

◆安装J2SE 1.6或更高版本

◆安装PHP 5.1.4或更高版本

◆解压php-java-bridge_5.2.2_j2ee.zip包

从命令提示符进入刚刚解压后的目录,输入:

?>java ?classpath JavaBridge.war TestInstallation

在这个文件夹下,你应该看到一个ext目录,它下面包括四个.jar文件,拷贝其中的JavaBridge.jar 和php-script.jar到你的J2SE安装目录下的ext文件夹(通常是{JAVA_HOME}/jre/lib/ext)。

对于J2EE,要执行下列安装步骤:

将JavaBridge.war文件拷贝到你的J2EE服务器或servlet引擎(Tomcat,Resin等)下的auto_deploy文件夹。

根据你的应用程序重命名该文件,然后重启J2EE服务器,等待自动部署进程创建与该.war文件相关的目录,在这个例子中,这个应用程序叫做appName.war。

从浏览器测试新的应用程序,输入:http://localhost:8080/appName,然后点击test.php。

如果你的J2EE服务器运行在不同的主机和端口好,参数要做相应的修改。

注意:如果你想在Apache或IIS上运行J2EE/PHP应用程序,将包括appName的目录拷贝到Apache/IIS的文档根目录下。

在PHP脚本中使用Java类

首先,你必须要知道PHP/Java桥为在PHP脚本中集成Java类创建了哪些特殊的函数(PHP类),这些函数包括:

◆java:它允许你访问给定名称的Java类型,如:

◆java("java.lang.System")->getProperties();

◆java_autoload:它允许你在当前的PHP脚本中载入一套Java库,如:

◆java_autoload("my_1.jar;my_2.jar");

◆java_cast:它允许你将一个Java对象转换成一个PHP值,如:

$mystr=new java("java.lang.String","9");$phpnr=java_cast($mystr,"integer");echo $ phpnr;

◆java_is_null:你可以使用它检查值是否为空,如:

◆java_is_null(java("java.lang.System")->;getProperty("my_prop"))

◆java_session:你可以使用它返回一个会话句柄,如:

$session = java_session();

◆java_values:你可以使用它评估对象和提取其内容(仅当这个操作是可能的时候),如:

$result = java_values($calcinstance->addAB($term_1,$term_2));

为了使用这些函数,你的PHP应用程序必须包含对应的PHP类,最重要的类是Java.inc,在目录appName/java下有完整的类列表,通过Java.inc,你可以获得Java类的实例,如:

$calcinstance=new Java("calculator.CalculatorBean");

Reminder: There are more functions and their detailed information in the PHP/Java Bridge installation directory/documentation/API. Using Java Classes in PHP Scripts

Using PHP Scripts in Java Classes

In order to call PHP methods in Java applications, you must be very familiar with Java API, The most important class of this API is:

javax.script.ScriptEngineManager: This class extends the java.lang.Object class and provides an instantiation mechanism for the ScriptEngine class.

javax.script.ScriptEngine: This is a Java interface that includes the full functionality expected in every Java ScriptEngine, through classes such as AbstractScriptEngine, InteractivePhpScriptEngine, InvocablePhpScriptEngine, InvocablePhpServletScriptEngine, PhpScriptEngine, and PhpServletScriptEngine realized.

javax.script.Invocable: This interface provides a function that allows Java applications to call middle-tier code under the script compiler.

Reminder: There are more classes and their details in the /documentation/server/documentation/API directory.

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