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hellokatonhellokaton
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📝 add nashorn code example
1 parent aad683e commit 0ad5dc4

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‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn1.java‎

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package io.github.biezhi.java8.nashorn;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import java.io.FileReader;
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import java.time.LocalDateTime;
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import java.util.Date;
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/**
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* Calling javascript functions from java with nashorn.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn1 {
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval(new FileReader("java8-nashorn/src/main/resources/nashorn1.js"));
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Invocable invocable = (Invocable) engine;
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Object result = invocable.invokeFunction("fun1", "Peter Parker");
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System.out.println(result);
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System.out.println(result.getClass());
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invocable.invokeFunction("fun2", new Date());
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invocable.invokeFunction("fun2", LocalDateTime.now());
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invocable.invokeFunction("fun2", new Person());
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn10.java‎

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package io.github.biezhi.java8.nashorn;
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import jdk.nashorn.api.scripting.NashornScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import java.util.concurrent.TimeUnit;
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/**
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* @author Benjamin Winterberg
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*/
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public class Nashorn10 {
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public static void main(String[] args) throws ScriptException, NoSuchMethodException {
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NashornScriptEngine engine = (NashornScriptEngine) new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval("load('java8-nashorn/src/main/resources/nashorn10.js')");
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long t0 = System.nanoTime();
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for (int i = 0; i < 100000; i++) {
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engine.invokeFunction("testPerf");
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}
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long took = System.nanoTime() - t0;
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System.out.format("Elapsed time: %d ms", TimeUnit.NANOSECONDS.toMillis(took));
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn11.java‎

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package io.github.biezhi.java8.nashorn;
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import jdk.nashorn.api.scripting.NashornScriptEngine;
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import javax.script.Bindings;
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import javax.script.ScriptContext;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import javax.script.SimpleBindings;
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import javax.script.SimpleScriptContext;
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/**
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* @author Benjamin Winterberg
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*/
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public class Nashorn11 {
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public static void main(String[] args) throws Exception {
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// test1();
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// test2();
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// test3();
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// test4();
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// test5();
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// test6();
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// test7();
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test8();
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}
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private static void test8() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("var obj = { foo: 23 };");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context1 = new SimpleScriptContext();
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context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context2 = new SimpleScriptContext();
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context2.getBindings(ScriptContext.ENGINE_SCOPE).put("obj", defaultBindings.get("obj"));
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engine.eval("obj.foo = 44;", context1);
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engine.eval("print(obj.foo);", context1);
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engine.eval("print(obj.foo);", context2);
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}
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private static void test7() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("var foo = 23;");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context1 = new SimpleScriptContext();
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context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context2 = new SimpleScriptContext();
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context2.getBindings(ScriptContext.ENGINE_SCOPE).put("foo", defaultBindings.get("foo"));
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engine.eval("foo = 44;", context1);
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engine.eval("print(foo);", context1);
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engine.eval("print(foo);", context2);
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}
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private static void test6() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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ScriptContext defaultContext = engine.getContext();
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defaultContext.getBindings(ScriptContext.GLOBAL_SCOPE).put("foo", "hello");
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ScriptContext customContext = new SimpleScriptContext();
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customContext.setBindings(defaultContext.getBindings(ScriptContext.ENGINE_SCOPE), ScriptContext.ENGINE_SCOPE);
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Bindings bindings = new SimpleBindings();
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bindings.put("foo", "world");
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customContext.setBindings(bindings, ScriptContext.GLOBAL_SCOPE);
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// engine.eval("foo = 23;"); // overrides foo in all contexts, why???
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engine.eval("print(foo)"); // hello
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engine.eval("print(foo)", customContext); // world
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engine.eval("print(foo)", defaultContext); // hello
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}
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private static void test5() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("var obj = { foo: 'foo' };");
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engine.eval("function printFoo() { print(obj.foo) };");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context1 = new SimpleScriptContext();
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context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context2 = new SimpleScriptContext();
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context2.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("obj.foo = 'bar';", context1);
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engine.eval("printFoo();", context1);
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engine.eval("printFoo();", context2);
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}
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private static void test4() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context = new SimpleScriptContext();
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context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("foo();", context);
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System.out.println(context.getAttribute("foo"));
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}
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private static void test3() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context = new SimpleScriptContext();
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context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("function foo() { print('bar') };", context);
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engine.eval("foo();", context);
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Bindings bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
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System.out.println(bindings.get("foo"));
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System.out.println(context.getAttribute("foo"));
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}
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private static void test2() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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SimpleScriptContext context = new SimpleScriptContext();
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engine.eval("print(Function);", context);
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engine.eval("foo();", context);
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}
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private static void test1() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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engine.eval("foo();");
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}
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private static NashornScriptEngine createEngine() {
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return (NashornScriptEngine) new ScriptEngineManager().getEngineByName("nashorn");
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn2.java‎

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package io.github.biezhi.java8.nashorn;
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import jdk.nashorn.api.scripting.ScriptObjectMirror;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import java.io.FileReader;
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import java.util.Arrays;
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/**
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* Calling java methods from javascript with nashorn.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn2 {
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public static String fun(String name) {
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System.out.format("Hi there from Java, %s", name);
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return "greetings from java";
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}
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public static void fun2(Object object) {
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System.out.println(object.getClass());
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}
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public static void fun3(ScriptObjectMirror mirror) {
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System.out.println(mirror.getClassName() + ": " + Arrays.toString(mirror.getOwnKeys(true)));
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}
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public static void fun4(ScriptObjectMirror person) {
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System.out.println("Full Name is: " + person.callMember("getFullName"));
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}
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval(new FileReader("java8-nashorn/src/main/resources/nashorn2.js"));
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn3.java‎

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package io.github.biezhi.java8.nashorn;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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/**
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* Working with java types from javascript.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn3 {
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval("load('java8-nashorn/src/main/resources/nashorn3.js')");
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn4.java‎

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package io.github.biezhi.java8.nashorn;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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/**
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* Working with java types from javascript.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn4 {
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval("loadWithNewGlobal('java8-nashorn/src/main/resources/nashorn4.js')");
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn5.java‎

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package io.github.biezhi.java8.nashorn;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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/**
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* Bind java objects to custom javascript objects.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn5 {
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval("load('java8-nashorn/src/main/resources/nashorn5.js')");
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Invocable invocable = (Invocable) engine;
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Product product = new Product();
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product.setName("Rubber");
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product.setPrice(1.99);
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product.setStock(1037);
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Object result = invocable.invokeFunction("getValueOfGoods", product);
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System.out.println(result);
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}
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}

‎java8-nashorn/src/main/java/io/github/biezhi/java8/nashorn/Nashorn6.java‎

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package io.github.biezhi.java8.nashorn;
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import jdk.nashorn.api.scripting.ScriptObjectMirror;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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/**
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* Using Backbone Models from Nashorn.
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*
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* @author Benjamin Winterberg
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*/
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public class Nashorn6 {
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public static void main(String[] args) throws Exception {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
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engine.eval("load('java8-nashorn/src/main/resources/nashorn6.js')");
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Invocable invocable = (Invocable) engine;
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Product product = new Product();
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product.setName("Rubber");
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product.setPrice(1.99);
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product.setStock(1337);
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ScriptObjectMirror result = (ScriptObjectMirror)
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invocable.invokeFunction("calculate", product);
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System.out.println(result.get("name") + ": " + result.get("valueOfGoods"));
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}
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public static void getProduct(ScriptObjectMirror result) {
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System.out.println(result.get("name") + ": " + result.get("valueOfGoods"));
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}
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}

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