php&java(二)

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例子1:创建和使用你自己的java
创建你自己的java类非常容易。新建一个phptest.java文件,将它放置在你的java.class.path目录下,文件内容如下:

public class phptest{
/**
* A sample of a class that can work with php
* NB: The whole class must be public to work,  
* and of course the methods you wish to call
* directly.
*
* Also note that from php the main method
* will not be called   
*/

public String foo;

/**
* Takes a string and returns the result
* or a msg saying your string was empty
*/
public String test(String str) {    
if(str.equals("")) {
      str = "Your string was empty. ";    
}    
return str;   
}

/**
* whatisfoo() simply returns the value of the variable foo.
*/   
public String whatisfoo() {    
return "foo is " + foo;   
}


/**
* This is called if phptest is run from the command line with
* something like
*  java phptest
* or
*  java phptest hello there
*/
public static void main(String args[]) {
phptest p = new phptest();
     
if(args.length == 0) {
String arg = "";
System.out.println(p.test(arg));
}else{
for (int i=0; i < args.length; i++) {
String arg = args[i];
System.out.println(p.test(arg));   
}
}
}
}

创建这个文件后,我们要编译好这个文件,在DOS命令行使用javac phptest.java这个命令。

为了使用php测试这个java类,我们创建一个phptest.php文件,内容如下:

<?php

$myj = new java("phptest");
echo "Test Results are <b>" . $myj->test("Hello World") . "</b>";
  
$myj->foo = "A String Value";
echo "You have set foo to <b>"   . $myj->foo . "</b><br>n";
echo "My java method reports: <b>" . $myj->whatisfoo() . "</b><br>n";
  
?>

如果你得到这样的警告信息:java.lang.ClassNotFoundException error ,这就意味着你的phptest.class文件不在你的java.class.path目录下。
注意的是java是一种强制类型语言,而php不是,这样我们在将它们融合时,容易导致错误,于是我们在向java传递变量时,要正确指定好变量的类型。如:$myj->foo = (string) 12345678; or $myj->foo = "12345678";

这只是一个很小的例子,你可以创建你自己的java类,并使用php很好的调用它!<script type="text/javascript"><!--google_ad_client = "pub-2947489232296736";/* 728x15, 创建于 08-4-23MSDN */google_ad_slot = "3624277373";google_ad_width = 728;google_ad_height = 15;//--></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>
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