import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class ExpressTest { public static void test1() throws ScriptException { String str = "(a >= 0 && a <= 5)"; ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("js"); engine.put("a", 4); Object result = engine.eval(str); System.out.println("结果类型:" + result.getClass().getName() + ",计算结果:" + result); } public static void test2() throws ScriptException { String str = "43*(2 + 1.4)+2*32/(3-2.1)"; ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("js"); Object result = engine.eval(str); System.out.println("结果类型:" + result.getClass().getName() + ",计算结果:" + result); } public static void main(String[] args) throws ScriptException { test1(); test2(); } }
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