在JAVA程序中直接执行JAVASCRIPT代码（简单调用实例）

2019-11-17 04:03:19

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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。

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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();
        }
    }
}
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、发布即可生效。

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