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(); } }
jdk1.6中可以直接这样用
jdk1.5中需要以下jar:commons-logging-1.1.1.jar, js.jar, bsf-all-3.0.jar
转载至:https://www.cnblogs.com/tsql/p/11201594.html