java 将字符串转成算术表达式进行计算

来源：互联网发布：bi数据编辑：程序博客网时间：2024/05/17 00:54

转自 http://blog.csdn.net/linminqin/article/details/41804955

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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