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Java和Js之間的調(diào)用時(shí)基于ScriptEngineManager類囱桨，這個(gè)類是jdk6就有的 (謝謝@李患者 的提醒)

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.SimpleScriptContext;

import org.junit.Test;


public class JavaScriptFunction {

    @Test
    public void print() throws Exception{
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        engine.eval("print('hello word!!')");
    }
    
    @Test
    public void obj() throws Exception {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        StringBuffer script = new StringBuffer();
        script.append("var obj = new Object();");
        script.append("obj.hello = function(name){print('hello, '+name);}");
        //執(zhí)行這段script腳本
        engine.eval(script.toString());
        // javax.script.Invocable 是一個(gè)可選的接口
        // 檢查你的script engine 接口是否已實(shí)現(xiàn)!
        // 注意：JavaScript engine實(shí)現(xiàn)了Invocable接口
        Invocable inv = (Invocable) engine;
        // 獲取我們想調(diào)用那個(gè)方法所屬的js對(duì)象
        Object obj = engine.get("obj");
        // 執(zhí)行obj對(duì)象的名為hello的方法
        inv.invokeMethod(obj, "hello", "Script Method !!" );
    }
    
    @Test
    public void file() throws Exception{
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        engine.eval(new java.io.FileReader(new File("F:/test/test.js")));
        Invocable inv = (Invocable) engine;
        Object obj = engine.get("obj");
        inv.invokeMethod(obj, "name", "知道了" );
    }
    
    
    /**
     * 腳本變量
     * @throws Exception 
     */
    @Test
    public void scriptVar() throws Exception{
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        File file = new File("F:/test/test.txt");
        //將File對(duì)象f直接注入到j(luò)s腳本中并可以作為全局變量使用
        engine.put("files", file);
        engine.eval("print(files.getPath());print(files.getName());");
    }
    
    /**
     *  使用Script實(shí)現(xiàn)java接口
     * @throws Exception 
     */
    public void runnableImpl() throws Exception{
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("JavaScript");
        
        // String里定義一段JavaScript代碼腳本
        String script = "function run() { print('run called'); }";
        // 執(zhí)行這個(gè)腳本
        engine.eval(script);
        
        // 從腳本引擎中獲取Runnable接口對(duì)象（實(shí)例）. 該接口方法由具有相匹配名稱的腳本函數(shù)實(shí)現(xiàn)。
        Invocable inv = (Invocable) engine;
        // 在上面的腳本中嗅绰，我們已經(jīng)實(shí)現(xiàn)了Runnable接口的run()方法
        Runnable runnable = inv.getInterface(Runnable.class);
        
        // 啟動(dòng)一個(gè)線程運(yùn)行上面的實(shí)現(xiàn)了runnable接口的script腳本
        Thread thread = new Thread(runnable);
        thread.start();
    }
    
    /**
     * 腳本引擎的多個(gè)scope
     * @throws Exception 
     */
    @Test
    public void multiScopes() throws Exception{
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("nashorn");
        // 打印全局變量 "x"
        engine.put("x", "hello word!!");
        engine.eval("print(x);");
        // 上面的代碼會(huì)打印"hello word！搀继！"
        
        // 現(xiàn)在窘面，傳入另一個(gè)不同的script context
        ScriptContext context = new SimpleScriptContext();
        //新的Script context綁定ScriptContext的ENGINE_SCOPE
        Bindings bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
        
        // 增加一個(gè)新變臉到新的范圍 engineScope 中
        bindings.put("x", "word hello!!");
        // 執(zhí)行同一個(gè)腳本 - 但這次傳入一個(gè)不同的script context
        engine.eval("print(x);", bindings);
        engine.eval("print(x);");
    }
    
    
    
    public static void main(String[] args) throws Exception {
        new JavaScriptFunction().runnableImpl();
        
        List list = new ArrayList();
        list.add("1");
        list.add("1");
        list.add("1");
        
        for (Object object : list) {
            System.out.println(object);
        }
        
    }
}

運(yùn)用Java中的封裝技術(shù)將運(yùn)行js腳本程序進(jìn)行封裝

import java.io.FileNotFoundException;
import java.io.FileReader;

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

/**
 * 運(yùn)行腳本
 * @author Ruby
 *
 */
public class RunScript {

    private ScriptEngineManager manager = new ScriptEngineManager();
    private ScriptEngine engine;
    private String fileName;
    
    public RunScript(String fileName){
        engine = manager.getEngineByName("JavaScript");
        this.fileName = fileName;
    }
    
    /**
     * 設(shè)置變量
     * @param varName
     * @param obj
     */
    public void setVar(String varName, Object obj){
        engine.put(varName, obj);
    }
    
    /**
     * 啟動(dòng)腳本
     * @throws FileNotFoundException
     * @throws ScriptException
     */
    public void start() throws FileNotFoundException, ScriptException{
        engine.eval(new FileReader(fileName));
    }
}

測(cè)試

將Logger對(duì)象注入到j(luò)s對(duì)象中，那么在js文件中就可以使用java中的Logger對(duì)象了

public static void main(String[] args) throws Exception {
    RunScript rs = new RunScript("D:\test.js");
    rs.setVar("Logger", Logger.getLogger(ConsoleListener.class));
    rs.start();
}

js文件

logger.info("測(cè)試文件");

作者是一名自由程序員叽躯，住在上海财边，喜歡音樂、小說点骑、旅行酣难、以及編程。

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