JavaScript操作java对象

JavaScript操作Java对象的实现：

代码片段1（获取脚本引擎）：

import java.util.List;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class GetSupportedScriptingEngine {
    public static void main(String[] args) {

        //创建一个ScriptEngineManager
        ScriptEngineManager manager = new ScriptEngineManager();
        //取得所有ScriptEngineFactory
        List<ScriptEngineFactory> factories = manager.getEngineFactories();

        //遍历输出
        for (ScriptEngineFactory factory : factories) {
            System.out.println("EngineName      = " + factory.getEngineName());
            System.out.println("EngineVersion   = " + factory.getEngineVersion());
            System.out.println("LanguageName    = " + factory.getLanguageName());
            System.out.println("LanguageVersion = " + factory.getLanguageVersion());
            System.out.println("Extensions      = " + factory.getExtensions());

            List<String> names = factory.getNames();
            for (String name : names) {
                System.out.println("Engine Alias = " + name);
            }
            
            //通过factory获取ScriptEngine
            ScriptEngine scriptEngine = factory.getScriptEngine() ;
            //ScriptEngine scriptEngine1 = manager.getEngineByExtension("js") ;其他方式获取
            //ScriptEngine scriptEngine2 = manager.getEngineByName("JavaScript") ;其他方式获取
            try {
            	//脚本引擎执行JavaScript语句
				scriptEngine.eval("var arr = new Array() ; arr.push(1); print(arr.pop())") ;
			} catch (ScriptException e) {
				e.printStackTrace();
			}
        }
    }
}

 

代码片段2（JS操作Java）：

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

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;


public class JSModifiedJava {
	
	public void sayHello(String name){
		System.out.println("*************Hello***************"+name);
	} 
	
    public static void main(String[] args) {

        //创建 List对象，并添加3个原用户
        List<String> us = new ArrayList<String>();
        us.add("JLee 1");
        us.add("JLee 2");

        //获得JS引擎
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByExtension("js");

        //把List对象加入JS引擎
        engine.put("usList", us);
        //将要操作的对象法如引擎
        engine.put("obj", new JSModifiedJava()) ;
        
        try {
            engine.eval(getScript());//通过引擎调用getScript()
            //显示所有用户
            for (String usname : us) {
                System.out.println("所有用户 = " + usname);
            }
        } catch (ScriptException e) {
            e.printStackTrace();
        }
        
      //根据JavaScript名获取一个脚本引擎实例
	    ScriptEngine engine2 = manager.getEngineByName("JavaScript");
	    try {
	        engine2.eval("print('Hello JLee ...')");
	    } catch (ScriptException e) {
	        e.printStackTrace();
	    }

    }

    //获取JavaScript串
    private static String getScript() {
        //我们在脚本里添加4个新用户
        String script =
                "var index; " +
                "var usname = usList.toArray(); " +
                "for (index in usname) { " +
                "    println('原用户='+usname[index]); " +
                "}" +
                "usList.add(\"JLee 3\"); " +
        		"usList.add(\"JLee 4\"); "  +
        		"obj.sayHello('JLee')" ;
        return script;
    }
    
}

 

评论

1 楼 zgpinguo 2012-04-04  

dwr就是一种javascript调用java方法的。。。