php&java(二)

  •   2009-07-31/21:12
  • 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!

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