php&java(二)

NO IMAGE

例子1:建立和使用你自己的JAVA類
建立你自己的JAVA類非常容易。新建一個phptest.java檔案,將它放置在你的java.class.path目錄下,檔案內容如下:

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));   
}
}
}
}

建立這個檔案後,我們要編譯好這個檔案,在DOS命令列使用javac phptest.java這個命令。

為了使用PHP測試這個JAVA類,我們建立一個phptest.php檔案,內容如下:

<?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";

?>

如果你得到這樣的警告資訊:java.lang.ClassNotFoundException error ,這就意味著你的phptest.class檔案不在你的java.class.path目錄下。
注意的是JAVA是一種強制型別語言,而PHP不是,這樣我們在將它們融合時,容易導致錯誤,於是我們在向JAVA傳遞變數時,要正確指定好變數的型別。如:$myj->foo = (string) 12345678; or $myj->foo = "12345678";

這只是一個很小的例子,你可以建立你自己的JAVA類,並使用PHP很好的呼叫它!