php&java(二)
2024-05-04 23:00:35
供稿:网友
菜鸟学堂:
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!