php&java(二)

  例子1:创建和使用你自己的JAVA类

  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!