import java.io.File;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class ScriptTest {
public static void main(String[] args) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
testScriptVariables(engine);// 演示如何暴露Java對(duì)象為腳本語(yǔ)言的全局變量
testInvokeScriptMethod(engine);// 演示如何在Java中調(diào)用腳本語(yǔ)言的方法
testScriptInterface(engine);// 演示腳本語(yǔ)言如何實(shí)現(xiàn)Java的接口
testUsingJDKClasses(engine);// 演示腳本語(yǔ)言如何使用JDK平臺(tái)下的類(lèi)
}
public static void testScriptVariables(ScriptEngine engine)
throws ScriptException {
File file = new File("e:/test/aaa.txt");
engine.put("f", file);
engine.eval("println('Total Space:'+f.getTotalSpace())");
}
public static void testInvokeScriptMethod(ScriptEngine engine)
throws Exception {
String script = "function hello(name) { return 'Hello,' + name;}";
engine.eval(script);
Invocable inv = (Invocable) engine;
String res = (String) inv.invokeFunction("hello", "Scripting");
System.out.println("res:" + res);
}
public static void testScriptInterface(ScriptEngine engine)
throws ScriptException {
String script = "var obj = new Object(); obj.run = function() { println('run method called'); }";
engine.eval(script);
Object obj = engine.get("obj");
Invocable inv = (Invocable) engine;
Runnable r = inv.getInterface(obj, Runnable.class);
Thread th = new Thread(r);
th.start();
}
public static void testUsingJDKClasses(ScriptEngine engine)
throws Exception {
// Packages是腳本語(yǔ)言里的一個(gè)全局變量,專(zhuān)用于訪(fǎng)問(wèn)JDK的package
String js = "function doSwing(t){var f=new Packages.javax.swing.JFrame(t);f.setSize(400,300);f.setVisible(true);}";
engine.eval(js);
Invocable inv = (Invocable) engine;
inv.invokeFunction("doSwing", "Scripting Swing");
}
}
</script>