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  • java执行字符串中的运算公式

    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

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  • 原文地址:https://www.cnblogs.com/tsql/p/11201594.html
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