JAVA使用指令碼引擎執行JS

標籤：java   javascript   

import java.io.File;import java.lang.reflect.Field;import java.util.Arrays;import javax.script.Invocable;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;import javax.script.ScriptException;public class JavaExecScriptDemo {    public static void main(String[] args) {    System.out.println(jsObjFunc());    System.out.println(Arrays.toString(getArray()));    System.out.println(jsCalculate("a=1+2+3+(2*2)"));    jsFunction();    jsVariables();  }  /**   * 運行JS對象中的函數   *    * @return   */  public static Object jsObjFunc() {    String script =        "var obj={run:function(){return 'run method : return:\"abc'+this.next('test')+'\"';},next:function(str){return ' 我來至next function '+str+')'}}";    ScriptEngineManager sem = new ScriptEngineManager();    ScriptEngine scriptEngine = sem.getEngineByName("js");    try {      scriptEngine.eval(script);      Object object = scriptEngine.get("obj");      Invocable inv2 = (Invocable) scriptEngine;      return (String) inv2.invokeMethod(object, "run");    } catch (Exception e) {      e.printStackTrace();    }    return null;  }  /**   * 擷取js對象數字類型屬性   *    * @return   */  public static Object[] getArray() {    ScriptEngineManager sem = new ScriptEngineManager();    String script = "var obj={array:['test',true,1,1.0,2.11111]}";    ScriptEngine scriptEngine = sem.getEngineByName("js");    try {      scriptEngine.eval(script);      Object object2 = scriptEngine.eval("obj.array");      Class<?> clazz = object2.getClass();      Field denseField = clazz.getDeclaredField("dense");      denseField.setAccessible(true);      return (Object[]) denseField.get(object2);    } catch (Exception e) {      e.printStackTrace();    }    return null;  }  /**   * JS計算   *    * @param script   * @return   */  public static Object jsCalculate(String script) {    ScriptEngineManager manager = new ScriptEngineManager();    ScriptEngine engine = manager.getEngineByName("javascript");    try {      return (Object) engine.eval(script);    } catch (ScriptException ex) {      ex.printStackTrace();    }    return null;  }  /**   * 運行JS基本函數   */  public static void jsFunction() {    ScriptEngineManager sem = new ScriptEngineManager();    ScriptEngine se = sem.getEngineByName("javascript");    try {      String script = "function say(name){ return 'hello,'+name; }";      se.eval(script);      Invocable inv2 = (Invocable) se;      String res = (String) inv2.invokeFunction("say", "test");      System.out.println(res);    } catch (Exception e) {      e.printStackTrace();    }  }  /**   * JS中變數使用   */  public static void jsVariables() {    ScriptEngineManager sem = new ScriptEngineManager();    ScriptEngine engine = sem.getEngineByName("javascript");    File file = new File("/data/js.txt");    engine.put("file", file);    try {      engine.eval("println('path:'+file.getAbsoluteFile())");    } catch (ScriptException e) {      e.printStackTrace();    }  }}

執行Main函數返回結果如下

run method : return:"abc 我來至next function test)"

[test, true, 1.0, 1.0, 2.11111]

10.0

hello,test

path:/data/js.txt

JAVA使用指令碼引擎執行JS