graalvm js 支持了基于远端模式的js 文件加载（当然是处于实验阶段的，生产谨慎使用），以下是一个简单的demo
环境准备
- 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 以下可选-->
<!-- <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>
- 开启实验特性的远端url 加载
Engine engine = Engine.newBuilder().option("js.load-from-url","true").allowExperimentalOptions(true).build();
- 代码
// 复用了同一个engine，可以提高性能
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 内容
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"
}
- 运行效果
参考资料
https://github.com/graalvm/graaljs/blob/master/docs/user/JavaScriptCompatibility.md