JDK1.7中调用javascript方法

import java.io.File;import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;public class TestJs {
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对象为脚本语言的全局变量
testInvokeScriptMethod(engine);// 演示如何在Java中调用脚本语言的方法
testScriptInterface(engine);// 演示脚本语言如何实现Java的接口
testUsingJDKClasses(engine);// 演示脚本语言如何使用JDK平台下的类
} public static void testScriptVariables(ScriptEngine engine)
throws ScriptException {
File file = new File("test.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是脚本语言里的一个全局变量,专用于访问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");
}
}