graalvm js 支援了基於遠端模式的js 檔案載入（當然是處於實驗階段的，生產謹慎使用），以下是一個簡單的demo

環境準備

• pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 

  <modelVersion>4.0.0</modelVersion>

​

  <groupId>com.dalong.ex</groupId>

  <artifactId>qlex-learnint</artifactId>

  <version>1.0-SNAPSHOT</version>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 

    <encoding>UTF-8</encoding>

    <java.version>1.8</java.version>

    <maven.compiler.source>1.8</maven.compiler.source>

    <maven.compiler.target>1.8</maven.compiler.target>

  </properties>

  <dependencies>

    <dependency>
 

      <groupId>com.alibaba</groupId>

      <artifactId>QLExpress</artifactId>

      <version>3.2.0</version>

    </dependency>

<!--    如果使用了js-scriptengine 以下可選-->

<!--    <dependency>-->

<!--      <groupId>org.graalvm.truffle</groupId>-->

<!--      <artifactId>truffle-api</artifactId>-->

<!--      <version>20.2.0</version>-->

<!--    </dependency>-->

<!--    <dependency>-->

<!--      <groupId>org.graalvm.sdk</groupId>-->

<!--      <artifactId>graal-sdk</artifactId>-->

<!--      <version>20.2.0</version>-->

<!--    </dependency>-->

    <dependency>

      <groupId>org.graalvm.js</groupId>

      <artifactId>js-scriptengine</artifactId>

      <version>20.2.0</version>

    </dependency>

    <dependency>

      <groupId>org.graalvm.js</groupId>

      <artifactId>js</artifactId>

      <version>20.2.0</version>

    </dependency>

  </dependencies>

  <build>

    <!-- Maven Shade Plugin -->

    <finalName>my-expression-app</finalName>

    <plugins>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-shade-plugin</artifactId>

        <version>2.3</version>

        <executions>

          <execution>

            <phase>package</phase>

            <goals>

              <goal>shade</goal>

            </goals>

            <configuration>

              <transformers>

                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

                  <mainClass>Application</mainClass>

                </transformer>

              </transformers>

            </configuration>

          </execution>

        </executions>

      </plugin>

    </plugins>

  </build>

</project>

• 開啟實驗特性的遠端url 載入

Engine engine = Engine.newBuilder().option("js.load-from-url","true").allowExperimentalOptions(true).build();

• 程式碼

// 複用了同一個engine，可以提高效能

public static void loadURL(Engine engine) throws IOException {

    Context context = Context.newBuilder().allowAllAccess(true).allowHostClassLoading(true).allowIO(true).engine(engine).build();

    Source mysource =Source.newBuilder("js"," load(\"http://127.0.0.1:8080/mylogin.js\")","rongdemo").build();

    context.eval(mysource);

    Value callapp = context.getBindings("js").getMember("mylogin");

    System.out.println(callapp.execute());

}

• mylogin.js 內容

function mylogin(){

  var BigDec = Java.type('java.math.BigDecimal');

  var bd = new BigDec("0.1");

  console.log(bd.add(bd).toString());

  return "dalong rong feng"

}

• 執行效果

參考資料

https://github.com/graalvm/graaljs/blob/master/docs/user/JavaScriptCompatibility.md