Java脚本引擎/动态脚本/表达式引擎

使用场景

• 代码热更新
• 处理需要灵活配置且不断变更的动态业务规则
• 复杂的规则匹配

Groovy引擎

1. 在资源目录下新建

   /groovy/hello.groovy

   。

package groovy

def sayHello(name) {
    println name + "向你说 “你好！！”";
    def date = new Date();
    return "success sayHello()+test  groovy" + date;
}

sayHello('asda');
           

1. java代码执行groovy脚本。

GroovyScriptEngine scriptEngine = new GroovyScriptEngine(GroovyMain.class.getResource("/groovy").getPath());
        Binding binding = new Binding();
        scriptEngine.run("hello.groovy", binding);
           

JavaScript Engine

示例1

@Test
    public void t1() throws ScriptException {
        ScriptEngineManager manager = new ScriptEngineManager();
        // 建立javascript脚本引擎
        ScriptEngine engine = manager.getEngineByName("javascript");
        engine.put("list", Arrays.asList("111", "222", "3333"));
        engine.put("str", "111");
        Object res = engine.eval("list.contains(str)");
        System.out.println(res);
    }
           

示例2

@Test
    public void t2() throws ScriptException {
        ScriptEngineManager manager = new ScriptEngineManager();
        // 建立javascript脚本引擎
        ScriptEngine engine = manager.getEngineByName("javascript");
        String scoreScript = "function getScore(score){if (score>85) {return '优秀'} else if (score>60) {return '及格'} else {return '不及格'}} getScore(33);";
        Compilable compilable = (Compilable) engine;
        CompiledScript compile = compilable.compile(scoreScript);
        Object res = compile.eval();
        System.out.println(res);

    }
           

示例3

@Test
    public void t3() throws Exception {
        ScriptEngineManager manager = new ScriptEngineManager();
        // 建立javascript脚本引擎
        ScriptEngine engine = manager.getEngineByName("javascript");
        String scoreScript = "function getScore(score){if (score>85) {return '优秀'} else if (score>60) {return '及格'} else {return '不及格'}}";
        engine.eval(scoreScript);
        Object score = ((Invocable) engine).invokeFunction("getScore", 87);
        System.out.println(score);
    }