在Java 7 以后,可以在Java代码中调用javascript中的函数,请看下面的例子:
package com.lee; import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;
import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException; /**
*
* @author liyanxue
*/
public class JavaInvokeJS { public static void main(String[] args) throws FileNotFoundException, ScriptException, NoSuchMethodException {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript" );
Bindings bind = engine.createBindings();
bind.put( "factor", 0);
engine.setBindings(bind, ScriptContext. ENGINE_SCOPE); // 输入方式
/*
Scanner input = new Scanner(System.in);
while (input.hasNextInt()) {
int first = input.nextInt();
int second = input.nextInt(); System.out.println("输入的参数是:" + first + ", " + second);
engine.eval(new FileReader("/Users/ liyanxue/model.js")); if (engine instanceof Invocable ) {
Invocable in = (Invocable ) engine;
// 执行 js函数
Double result = (Double) in.invokeFunction("formula", first, second);
System.out.println("运算结果是:" + result.intValue());
}
}
*/
int first = 23;
int second = 7; System. out.println("输入的参数是:" + first + ", " + second);
engine.eval( new FileReader("/Users/liyanxue/model.js" )); if (engine instanceof Invocable) {
Invocable in = (Invocable) engine;
// 执行js函数
Double result = (Double) in.invokeFunction( "formula", first, second);
System. out.println("运算结果是:" + result.intValue());
}
}
}
/Users/liyanxue/model.js里的代码:
function formula(var1, var2) {
return var1 + var2 + factor;
}