作者:井中月 例子1:創(chuàng)建和使用你自己的JAVA類 創(chuàng)建你自己的JAVA類非常容易。新建一個phptest.java文件,將它放置在你的java.class.path目錄下,文件內(nèi)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)); } } } }
創(chuàng)建這個文件后,我們要編譯好這個文件,在DOS命令行使用javac phptest.java這個命令。
為了使用PHP測試這個JAVA類,我們創(chuàng)建一個phptest.php文件,內(nèi)容如下:
$myj = new Java("phptest"); echo "Test Results are " . $myj->test("Hello World") . "";
$myj->foo = "A String Value"; echo "You have set foo to " . $myj->foo . " n"; echo "My java method reports: " . $myj->whatisfoo() . " n";
?>
如果你得到這樣的警告信息:java.lang.ClassNotFoundException error ,這就意味著你的phptest.class文件不在你的java.class.path目錄下。 注意的是JAVA是一種強制類型語言,而PHP不是,這樣我們在將它們?nèi)诤蠒r,容易導(dǎo)致錯誤,于是我們在向JAVA傳遞變量時,要正確指定好變量的類型。如:$myj->foo = (string) 12345678; or $myj->foo = "12345678";
這只是一個很小的例子,你可以創(chuàng)建你自己的JAVA類,并使用PHP很好的調(diào)用它!
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