java脚本语言之eval功能

最近在项目中需要利用到类似javascript的eval函数的功能来执行一个String表达式，例如表达式为：

 

 String expression= "((parm1<456)||(time*time>(modifyTime*5000-200))) && (((money <10000||money*money>=100000)))";

其中有几个变量： parm1    time    modifyTime   money。

然后找到了几个脚本语言来实现这一功能。下面我为大家一一介绍。

首先是很老资格的Beanshell

Beanshell

import bsh.EvalError;
import bsh.Interpreter;
import bsh.ParseException;
import bsh.TargetError;

public class BeanShellEngine {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
	   
	    String ruleStirng= "((parm1<456)||(time*time>(modifyTime*5000-200))) && (((money <10000||money*money>=100000)))";
	  
	    Interpreter in = new Interpreter();
	    Object res=null;
		try {
			
				in.set("parm1",123);
				in.set("time", 456);
				in.set("modifyTime",789);
				in.set("money",123456);
				res= in.eval(ruleStirng);
	
			      System.out.println(res);
	

		} catch (ParseException pe) {
		pe.printStackTrace();
		} catch (TargetError te) {
		System.out.println(te.getErrorLineNumber()
		+ "" + te.getErrorText());
		} catch (EvalError ee) {
		ee.printStackTrace();
	}
	}
}

 接着是Groovy

Groovy

import groovy.lang.GroovyShell;
import java.io.IOException;
import org.codehaus.groovy.control.CompilationFailedException;

public class GroovyEngine {

	public static void main(String[] args) {
		GroovyShell shell = new GroovyShell();
		String ruleStirng= "((parm1<456)||(time<(modifyTime-200))) && (money >10000)";
		
		try {
			Object result=null;
			
			shell.setProperty("money",123);
			shell.setProperty("time", 456);
			shell.setProperty("modifyTime",789);
			shell.setProperty("parm1",123456);
			 result = shell.evaluate(ruleStirng);
			System.out.println(result);
		} catch (CompilationFailedException cfe) {
			System.out.println("Syntax not correct " + cfe);
		}
	}
}

 接着是IK(javaeye上一牛人写的 可以搜索IK表达式 IK分词等)

import java.util.ArrayList;
import java.util.List;

import org.wltea.expression.ExpressionEvaluator;
import org.wltea.expression.datameta.Variable;

public class IkEngine {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//定义表达式
		String ruleStirng= "((parm1<456)||(time<(modifyTime-200))) && (money >10000)";
		
		
		List<Variable> variables = new ArrayList<Variable>();
		Object result=null;
		
		variables.add(Variable.createVariable("money"123));
		variables.add(Variable.createVariable("modifyTime",456));
		variables.add(Variable.createVariable("time",789));
		variables.add(Variable.createVariable("parm1",123456));
		//执行表达式
		result = ExpressionEvaluator.evaluate(ruleStirng, variables);
	
		
		System.out.println("Result = " + result);		

	}

}

 接着是JPython

import org.python.util.PythonInterpreter;

public class PythonEngine {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		PythonInterpreter in = new PythonInterpreter();
		String ruleStirng= "((parm1<456)|(time<(modifyTime-200)))&(money >10000)";

		 Object result =null;
		
				in.set("money",123);
				in.set("time",456);
				in.set("modifyTime",789);
				in.set("parm1",123456);
				result=in.exec(ruleStirng);
		
			System.out.println(result);

	}

}

 

接着是Mvel(JBOSS RULE里使用的)

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import org.mvel2.MVEL;

public class MvelEngine {

          public static void main(String[] args) {
   
        	  String expression= "((parm1<456)||(time*time>(modifyTime*5000-200))) && (((money <10000||money*money>=100000)))";
        	
              Serializable compiled = MVEL.compileExpression(expression);

                Map vars = new HashMap();
         
                Object result =null;
  
    				vars.put("parm1",123);
    				vars.put("time",456);
    				vars.put("modifyTime",789);
    				vars.put("money",123456);
    				result=	MVEL.executeExpression(compiled, vars);
    			
              
                    System.out.println(result);
                         
          }
  

}

 接着是：Jruby (抱歉由于我对Ruby不感兴趣所以这个我没用只是下了jar)

 

接着是：rhinol(mozilla 开发的脚本语言)

import java.io.FileReader;
import java.io.IOException;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.JavaScriptException;
import org.mozilla.javascript.Scriptable;

public class ScriptEngine {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			Context cx = Context.enter();
			String ruleStirng= "((parm1<456)||(time<(modifyTime-200)))&&(money >10000)";
			
			Scriptable scope = cx.initStandardObjects();
			Object result =null;
			
			scope.put("money", scope,1);
			scope.put("time", scope,2);
			scope.put("modifyTime", scope,3);
			scope.put("parm1", scope,4);
			result= cx.evaluateString(
					scope,
					ruleStirng
					,"<cmd>", 1, null
					);
		
			System.out.println(result);
			} catch (JavaScriptException jse) {
			jse.printStackTrace();
			} finally {
			Context.exit();
			}
			}


}

评论

2 楼 michaelzhouh 2014-02-19  

如果有一个public static String md5(String password){..}，表达式包含这个md5("123456")咋个整呢？

1 楼 x007700x 2012-11-17  

好东东啊