java逻辑表达式计算与判断

客官°小女子只卖身不卖艺 2022-04-13 14:58 392阅读 0赞

package com.cyb.regex;
    
    import java.text.MessageFormat;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Locale;
    
    import javax.script.ScriptEngine;
    import javax.script.ScriptEngineManager;
    import javax.script.ScriptException;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    
    import com.cyb.collection.utils.RandomUtils;
    import com.cyb.context.TimeContext;
    
    import sun.tools.tree.Expression;
    
    /**
     * 作者 : iechenyb<br>
     * 类描述: 说点啥<br>
     * 创建时间: 2018年9月11日
     */
    public class 逻辑表达式 {
    	Log log = LogFactory.getLog(逻辑表达式.class);
    
    	public static void test() {
    		MessageFormat mf = new MessageFormat("aaa{0}{0}", Locale.US);
    		Object arr[] = { "he" };
    		System.out.println(mf.format(arr));
    
    		String booleanString = "{0}>1 && {0}<=5";
    		System.out.println(Boolean.valueOf(MessageFormat.format(booleanString, 6)));
    		System.out.println(Boolean.valueOf(MessageFormat.format(booleanString, 2)));
    
    		String expression = "value>1 && value<=5";
    		Boolean rs = assertExpressTrue("2", expression);
    		for (int i = 1; i < 8; i++) {
    			rs = assertExpressTrue(i + "", expression);
    			System.out.println(i + ",rs=" + rs);
    		}
    	}
        static List<String> expressions = new ArrayList<String>();
        static{
        	//expressions.add("1<value<5");//必须拆分 不合法
        	//expressions.add("value>10% && value<60%");//异常
        	//expressions.add("value>0.01 && value<0.65");
        	//expressions.add("value>1 && value<=5");
        	//expressions.add("value>1 || value<=5");
        	//expressions.add("(value>1 && value<=5)||value > 10");
        }
        
        static List<String> arithmetics = new ArrayList<String>();
        static{
        	arithmetics.add("10 * 2 + 6 / (3 - 1)");
        	arithmetics.add("1/100+10");
        	arithmetics.add("2*3+5*2/100");
        }
        
    	public static void main(String[] args) throws InterruptedException {
    		TimeContext.recordTimeStart();
    		test();
    		int i=0;
    		while(i<10){
    			i++;
    			for(String ex:expressions){
    				String param = String.valueOf(RandomUtils.getNum(1, 100)*1.0/100);
    				boolean res = assertExpressTrue(String.
    						valueOf(param),
    						ex);
    				System.out.println("表达式："+ex+"\t参数:"+param+"\t"+res);
    			}
    		}
    		for(String ex:arithmetics){
    			String result = calStringExpression(ex);
    			System.out.println("表达式："+ex+"\t结果:"+result);
    		}
    		TimeContext.calExecuteTime();
    	}
    
    	/**
    	 * 
    	 * @author: Longjun
    	 * @Description: 将${money>=2000&&money<=4000}字符串截取成
    	 *               "money>=2000&&money<=4000"， 然后判断一个数值字符串是否在此区间内
    	 * @date:2016年3月21日 上午11:25:32
    	 */
    	public static Boolean assertExpressTrue(String value, String expression) {
    		String el = expression;
    		ScriptEngineManager manager = new ScriptEngineManager();
    		ScriptEngine engine = manager.getEngineByName("js");
    		engine.put("value", value);
    		boolean eval = false;
    		try {
    			eval = (boolean) engine.eval(el);
    		} catch (ScriptException e) {
    			e.printStackTrace();
    		}
    		return eval;
    	}
    
    	public static String calStringExpression(String expression) {
    		ScriptEngineManager scriptEngineManager 
    		= new ScriptEngineManager();
    		ScriptEngine scriptEngine 
    		= scriptEngineManager.getEngineByName("js");//nashorn
    		try {
    			String result = String.valueOf(scriptEngine.eval(expression));
    			return result;
    		} catch (ScriptException e) {
    			e.printStackTrace();
    			return "";
    		}
    	}
    }