JAVA调用JS函数

今天在开发中使用到了js和Java的交互，平时我们用的比较多的就是js调用Java的方法，可以使用dwr、Ajax、jquery。突然发现要Java调用js的话还真没有见过，今天上网查询了下资料，顺便总结一下：

前提条件：jdk1.6才支持，1.6以前的就不行了。

js代码如下：

function convert (id,str)
{
    if (‘505041’==id)
    {
        return str;
    }
    else
    {
        return “A”;
    }
}

function convert (id,str)
{
    if ('505041'==id)
    {
        return str;
    }
    else
    {
        return "A";
    }
}

 

Java代码如下：

package com.sc;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class JsTest {


    public static void main(String[] args) throws Exception {
        testJSFile();
    }

    private static void testJSFile() throws Exception {
        ScriptEngineManager mgr = new ScriptEngineManager();
        ScriptEngine engine = mgr.getEngineByName(”javascript”);
        engine.eval(readJSFile());
        Invocable inv = (Invocable) engine;
        Object res = (Object) inv.invokeFunction(”convert”, new String[] { “5050412”, “D” });
        System.out.println(”res:” + res);
    }

    private static String readJSFile() throws Exception {
        StringBuffer script = new StringBuffer();
        File file = new File(“E:\\workspace\\test4\\WebRoot\\test.js”);
        FileReader filereader = new FileReader(file);
        BufferedReader bufferreader = new BufferedReader(filereader);
        String tempString = null;
        while ((tempString = bufferreader.readLine()) != null) {
            script.append(tempString).append(”\n”);
        }
        bufferreader.close();
        filereader.close();
        return script.toString();
    }
}

package com.sc;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class JsTest {


    public static void main(String[] args) throws Exception { 
        testJSFile(); 
    } 

    private static void testJSFile() throws Exception { 
        ScriptEngineManager mgr = new ScriptEngineManager(); 
        ScriptEngine engine = mgr.getEngineByName("javascript"); 
        engine.eval(readJSFile()); 
        Invocable inv = (Invocable) engine; 
        Object res = (Object) inv.invokeFunction("convert", new String[] { "5050412", "D" }); 
        System.out.println("res:" + res); 
    } 

    private static String readJSFile() throws Exception { 
        StringBuffer script = new StringBuffer(); 
        File file = new File("E:\\workspace\\test4\\WebRoot\\test.js"); 
        FileReader filereader = new FileReader(file); 
        BufferedReader bufferreader = new BufferedReader(filereader); 
        String tempString = null; 
        while ((tempString = bufferreader.readLine()) != null) { 
            script.append(tempString).append("\n"); 
        } 
        bufferreader.close(); 
        filereader.close(); 
        return script.toString(); 
    }
}

 

在Java类中直接run就可以得到如下结果：

res:A

以此记录一下。