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aofengaofeng
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多个脚本引擎执行JavaScript（未预编译）的性能比较
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‎lib/commons-jexl3-3.0.jar‎

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‎src/cn/aofeng/demo/script/MultiScriptEngineCompare.java‎

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package cn.aofeng.demo.script;
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import java.util.HashMap;
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import java.util.Map;
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import javax.script.Bindings;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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/**
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* 多个脚本引擎执行JavaScript的性能比较。
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*
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* @author <a href="mailto:[email protected]">聂勇</a>
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*/
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public class MultiScriptEngineCompare {
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/**
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* 获取指定的脚本引擎执行指定的脚本。
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*
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* @param scriptEngineName 脚本引擎名称
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* @param script 脚本
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* @param count 脚本的执行次数
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* @param vars 绑定到脚本的变量集合
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* @throws ScriptException 执行脚本出错
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*/
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public void execute(String scriptEngineName, String script, int count,
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Map<String, Object> vars) throws ScriptException {
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ScriptEngine scriptEngine = getScriptEngine(scriptEngineName);
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System.out.println( String.format("脚本引擎：%s", scriptEngine.getFactory().getEngineName()) );
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System.out.println( String.format("脚本：%s", script) );
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System.out.println( String.format("脚本绑定参数：%s", vars) );
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long startTime = System.currentTimeMillis();
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for (int i = 0; i < count; i++) {
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runSingleScript(script, vars, scriptEngine);
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}
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long usedTime = System.currentTimeMillis() - startTime;
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System.out.println( String.format("脚本执行%d次，消耗%d毫秒。", count, usedTime) );
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System.out.println("");
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}
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private void runSingleScript(String script, Map<String, Object> vars, ScriptEngine scriptEngine) throws ScriptException {
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if (null == vars || vars.isEmpty()) {
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scriptEngine.eval(script);
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} else {
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Bindings binds = createBinding(scriptEngine, vars);
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scriptEngine.eval(script, binds);
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}
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}
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/**
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* 根据名称获取脚本引擎。
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*
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* @param name 脚本引擎名称
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* @return 实现了{@link ScriptEngine}的脚本引擎。如果没有对应的脚本引擎，返回null。
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*/
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public ScriptEngine getScriptEngine(String name) {
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ScriptEngineManager sem = new ScriptEngineManager();
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return sem.getEngineByName(name);
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}
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private Bindings createBinding(ScriptEngine scriptEngine, Map<String, Object> vars) {
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Bindings binds = scriptEngine.createBindings();
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if (null != vars && !vars.isEmpty()) {
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binds.putAll(vars);
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}
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return binds;
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}
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/**
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* @param args 执行次数
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* @throws ScriptException
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*/
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@SuppressWarnings({ "rawtypes", "unchecked" })
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public static void main(String[] args) throws ScriptException {
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if ( args.length != 1) {
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System.err.println("参数错误。使用示例：\n java cn.aofeng.demo.script.MultiScriptEngineCompare 100000");
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System.exit(-1);
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}
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int count = Integer.parseInt(args[0]);
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String[] scriptEngineList = {"JavaScript", "JEXL"};
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String script1 = "var c = a + b;" +
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"var d = a * b;" +
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"var e = a / b;" +
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"var f = a % b;" +
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"var g = a - b;" +
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"var result = ((a * 5) > b || b * 10 >= 100) && (a * b > 99);";
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Map<String, Object> vars1 = new HashMap<String, Object>(2);
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vars1.put("a", 20);
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vars1.put("b", 9);
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String script2 = "var result = src.indexOf(b);";
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Map<String, Object> vars2 = new HashMap<String, Object>(2);
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vars2.put("src", "compare performance javascript and jexl");
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vars2.put("b", "script");
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String[] scriptList = {script1, script2};
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Map[] varsList = {vars1, vars2};
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MultiScriptEngineCompare msec = new MultiScriptEngineCompare();
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for (int i = 0; i < scriptEngineList.length; i++) {
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for (int j = 0; j < scriptList.length; j++) {
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msec.execute(scriptEngineList[i], scriptList[j], count, varsList[j]);
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}
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}
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}
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}

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