一个在PHP脚本中的Java类示例
现在你已经知道了PHP/Java桥的基础知识了,可以着手开发自己的第一个PHP/Java应用程序了,这里举的例子比较简单,它是一个PHP脚本,实现了+,-,*,/四个基本操作的计算器,Java将会是这个应用程序的核心引擎,因为计算结果是由一个叫做CalculatorBean的Java类提供的,换句话说就是PHP将会把运算对象传递给Java函数,然后接收计算结果,并将结果显示给用户。
CalculatorBean类为运算符定义了四个函数,为返回结果定义了一个函数,完整的代码如下
package calculator; public class CalculatorBean implements java.io.Serializable { private float result; public CalculatorBean(){ this.result = 0.0f; } public float addAB(float a, float b) { this.result = a+b; return result; } public float subAB(float a, float b) {this.result = a-b; return result; } public float mplAB(float a, float b) { this.result = a*b; return result;} public float divAB(float a, float b) { this.result = a/b; return result;public float getResult(){ return this.result; } } |
当你编译这个Java源代码时,结果会产生一个叫做calculator.jar的.jar文件,将这个文件拷贝到appName/WEB-INF/lib目录。
接下来就可以编写PHP脚本来调用前面的Java类了,使用前面描述的函数,你可以编写一个calculator.php文件,参考
<?php require_once("java/Java.inc"); $session = java_session(); if(is_null(java_values($calcinstance=$session->get("calculatorInstance")))) { $session->put("calculatorInstance", $calcinstance=new Java("calculator.CalculatorBean")); } $result = 0; $opr = "none"; $term_1 = 0; $term_2 = 0; if(isset($_POST['operationName'])) { $opr = $_POST['operationName']; } if(isset($_POST['term1Name'])) { $term_1 = $_POST['term1Name']; } if(isset($_POST['term2Name'])) { $term_2 = $_POST['term2Name']; } if(strcmp($opr,"none") != 0) { if(strcmp($opr,"+") == 0) { $result = java_values($calcinstance->addAB($term_1,$term_2)); } if(strcmp($opr,"-") == 0) { $result = java_values($calcinstance->subAB($term_1,$term_2)); } if(strcmp($opr,"*") == 0) { $result = java_values($calcinstance->mplAB($term_1,$term_2)); } if(strcmp($opr,"/") == 0) { $result = java_values($calcinstance->divAB($term_1,$term_2)); } } else { $result = 0; $opr = "none"; $term_1 = 0; $term_2 = 0; } ?> <html> <head> <title>Simple Calculator</title> </head> <script type="text/javascript"> function numbers(objjs){ if(objjs == "=") { if(document.getElementById("term2ID").value == 0) {document.getElementById("term2ID").value = document.getElementById("valuefieldID").value;} document.getElementById("valuefieldID").value = ""; document.calcForm.submit(); } else if((objjs == "+")||(objjs == "-")||(objjs == "*")||(objjs == "/")) { document.getElementById("operationID").value = objjs; if(document.getElementById("valuefieldID").value == "") { document.getElementById("valuefieldID").value = document.getElementById("term1ID").value; } else { document.getElementById("term1ID").value = document.getElementById("valuefieldID").value; } document.getElementById("term2ID").value = 0; document.getElementById("valuefieldID").value = ""; } else { if(document.getElementById("valuefieldID").value == 0) { document.getElementById("valuefieldID").value = ""; } var calcValue = document.getElementById("valuefieldID").value; calcValue = calcValue + objjs; document.getElementById("valuefieldID").value = calcValue; } } function resetCalc(){ document.getElementById("valuefieldID").value = ""; document.getElementById("operationID").value = "none"; document.getElementById("term1ID").value = 0; document.getElementById("term2ID").value = 0; document.calcForm.submit(); } </script> <body> <form name="calcForm" action="<?php echo $PHP_SELF ?>" method="post"> <table> <tr> <td align="right" colspan="4"> <input align="right" id="valuefieldID" type="text" value="<?php echo $result; ?>" disabled> </td> </tr> <tr> <td> <input type="button" value="1" onclick="numbers(1);"> </td> <td> <input type="button" value="2" onclick="numbers(2);"> </td> <td> <input type="button" value="3" onclick="numbers(3);"> </td> <td> <input type="button" style="background-color:#cc0000;color:#ffffff" value="+" onclick="numbers('+');"> </td> </tr> <tr> <td> <input type="button" value="4" onclick="numbers(4);"> </td> <td> <input type="button" value="5" onclick="numbers(5);"> </td> <td> <input type="button" value="6" onclick="numbers(6);"> </td> <td> <input type="button" style="background-color:#cc0000;color:#ffffff" value="-" onclick="numbers('-');"> </td> </tr> <tr> <td> <input type="button" value="7" onclick="numbers(7);"> </td> <td> <input type="button" value="8" onclick="numbers(8);"> </td> <td> <input type="button" value="9" onclick="numbers(9);"> </td> <td> <input type="button" style="background-color:#cc0000;color:#ffffff" value="*" onclick="numbers('*');"> </td> </tr> <tr> <td> <input type="button" value="0" onclick="numbers(0);"> </td> <td> <input type="button" value="=" onclick="numbers('=');"> </td> <td> <input type="button" style="background-color:#000000;color:#ffffff" value="C" onclick="resetCalc();"> </td> <td> <input type="button" style="background-color:#cc0000;color:#ffffff" value="/" onclick="numbers('/');"> </td> </tr> </table> <input id="operationID" name="operationName" type="hidden" value="<?php echo $opr; ?>"> <input id="term1ID" name="term1Name" type="hidden" value="<?php echo $result; ?>"> <input id="term2ID" name="term2Name" type="hidden" value="<?php echo $term_2; ?>"> </form> </body> </html>
将calculator.php放如appName目录,如果你在Tomcat服务器下测试
localhost:8080),在浏览器的地址栏输入:
http://localhost:8080/appName/calculator.php,回车,你应该会看到如图1所示的页面:
JSP页面中的PHP脚本示例
假如你想使用PHP的随机函数在0和最大值之间获得一个随机数,你可以象下面这样使用ScriptEngine.
<% javax.script.ScriptEngine e = php.java.script.EngineFactory.getInvocablePhpScriptEngine (this, application, request, response); e.getContext().setWriter(out); e.eval ("<?php function randomNumber($maxim) { return rand(0,java_values($maxim)); }; ?>"); javax.script.Invocable i = (javax.script.Invocable) e; Object result = null; result = i.invokeFunction("randomNumber", new Object[]{new Integer(100)}); e.eval ((java.io.Reader)null); // flush the output generated by invokeXXX out.println("Random number printed from the servlet: " + result); %> |
在浏览器地址栏中输入:http://localhost:8080/appName/random.jsp,回车,你可能会看到如图所示的那样一个结果:
Java桌面应用程序中的PHP脚本
这个任务使用javax.script.ScriptEngineManager 和 javax.script.ScriptEngine类很容易就实现了,http://javaboutique.internet.com/tutorials/thebridge/listing3.html显示了一个和前面功能一样的J2SE/PHP应用程序,你可以在命令提示符下测试这个应用程序:
?gt;java –classpath {place here the application classpath} Javaphp |
使用jrunscript工具运行PHP脚本
Java自带了一个叫做jrunscript的工具,使用它可以从Java中向PHP脚本赋值,如:
jrunscript -l php {phpFile}.php
如下面的Hello.php脚本:
<?php echo 'Hello'; ?> |
可以像下面这样运行jrunscript:
..> jrunscript -l php Hello.php |
更好地工作
本文仅对PHP/Java桥做了一个简单的介绍,希望对你有所帮助,PHP/Java桥在PHP和Java这两门高级编程语言之间搭起了一座互通的桥梁,如果你认为这个技术对你的项目有帮助,那就不要犹豫了,动手开干吧!
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