在JAVA程序中直接執行JAVASCRIPT代碼（簡單調用實例）

2019-11-17 04:03:19

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JDK6.0支持java與JAVASCRipT之間的互相調用，下面的實例將演示幾種JAVA代碼調用執行Javascript代碼的方法。

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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 {
            //調用直接JAVASCRIPT語句
            se.eval("println('111');");
            String tmpstr = "test string";
            se.eval(("println('" + tmpstr + "');"));

            //調用無參數方法JAVASCRIPT函數
            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);

            //調用有參數JAVASCRIPT函數
            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 {
//調用直接JAVASCRIPT語句
se.eval("println('111');");
String tmpstr = "test string";
se.eval(("println('" + tmpstr + "');"));

//調用無參數方法JAVASCRIPT函數
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);

//調用有參數JAVASCRIPT函數
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();
}
}
}

執行后，輸出結果如下：

111
test string
Hello testname!my name is testname
Hello testname!my name is testname2

      javax.script包為我們提供了不少用得上的類和方法，這樣調用增加了前、后臺之間的交互性，JAVASCRIPT函數可寫在前臺頁面中，實現內容的變更對后臺無影響，不用重新編譯、發布即可生效。

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