在JAVA程序中直接执行JAVASCRIPT代码

JDK6.0支持java与JAVASCRipT之间的互相调用，下面的实例将演示几种JAVA代码调用执行Javascript代码的方法。

view plaincopy to clipboardPRint?

import javax.script.Invocable;  

import javax.script.ScriptEngine;  

import javax.script.ScriptEngineManager;  

import javax.script.ScriptException;  

 

public class Test {  

 

    public static void main(String[] args) {  

        ScriptEngineManager sem = new ScriptEngineManager();  

        ScriptEngine se = sem.getEngineByName("javascript");  

        try {  

            //调用直接JAVASCRIPT语句  

            se.eval("println('111');");  

            String tmpstr = "test string";  

            se.eval(("println('" + tmpstr + "');"));  

 

            //调用无参数方法JAVASCRIPT函数  

            se.eval("function sayHello() {" 

                    + "  print('Hello '+strname+'!');return 'my name is '+strname;" + "}");  

            Invocable invocableEngine = (Invocable) se;  

            se.put("strname", "testname");  

            String callbackvalue=(String) invocableEngine.invokeFunction("sayHello");  

            System.out.println(callbackvalue);  

              

            //调用有参数JAVASCRIPT函数  

            se.eval("function sayHello2(strname2) {" 

                    + "  print('Hello '+strname+'!');return 'my name is '+strname2;" + "}");  

            callbackvalue=(String)invocableEngine.invokeFunction("sayHello2", "testname2");  

            System.out.println(callbackvalue);  

              

        } catch (ScriptException e) {  

            // TODO Auto-generated catch block  

            e.printStackTrace();  

        } catch (NoSuchMethodException e) {  

            // TODO Auto-generated catch block  

            e.printStackTrace();  

        }  

    }  

} 

执行后，输出结果如下：

111

test string

Hello testname!my name is testname

Hello testname!my name is testname2

      javax.script包为我们提供了不少用得上的类和方法，这样调用增加了前、后台之间的交互性，JAVASCRIPT函数可写在前台页面中，实现内容的变更对后台无影响，不用重新编译、发布