String字符串判断真假

Question

String str = "true&true||(true||false&(true||false))";
如何用程序判断字符串结果为真还是假？

Answer 1

[code="java"]package com.chinahrt.zyn.iteye;

import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import ognl.Ognl;
import ognl.OgnlException;

public class ScriptTest {

/**
 * @param args
 * Administrator
 * 2013-6-19 下午5:26:06
 * @throws ScriptException 
 * @throws OgnlException 
 */
public static void main(String[] args) throws ScriptException, OgnlException {
    //方式一，转换为javascript脚本，利用java的脚本引擎来执行
    ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript");  
    Compilable compilable = (Compilable) engine;  
    Bindings bindings = engine.createBindings(); //Local级别的Binding   
    String script = "true&true||(true||false&(true||false))"; //定义函数并调用   
    CompiledScript JSFunction = compilable.compile(script); //解析编译脚本函数   

    Object result = JSFunction.eval(bindings);  
    System.out.println(result); //调用缓存着的脚本函数对象，Bindings作为参数容器传入

    //利用Ognl表达式来计算（需要导入ognl.jar）
    Object re = Ognl.getValue("true&&true||(true||false&&(true||false))",null);
    System.out.println(re);
}

}
[/code]