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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.script;
import cn.hutool.core.map.WeakConcurrentMap;
import cn.hutool.core.util.StrUtil;
import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.Invocable;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
/**
* 脚本工具类
*
* @author Looly
*/
public class ScriptUtil {
private static final ScriptEngineManager MANAGER = new ScriptEngineManager();
private static final WeakConcurrentMap CACHE = new WeakConcurrentMap<>();
/**
* 获得单例的{@link ScriptEngine} 实例
*
* @param nameOrExtOrMime 脚本名称
* @return {@link ScriptEngine} 实例
*/
public static ScriptEngine getScript(String nameOrExtOrMime) {
return CACHE.computeIfAbsent(nameOrExtOrMime, () -> createScript(nameOrExtOrMime));
}
/**
* 创建 {@link ScriptEngine} 实例
*
* @param nameOrExtOrMime 脚本名称
* @return {@link ScriptEngine} 实例
* @since 5.2.6
*/
public static ScriptEngine createScript(String nameOrExtOrMime) {
ScriptEngine engine = MANAGER.getEngineByName(nameOrExtOrMime);
if (null == engine) {
engine = MANAGER.getEngineByExtension(nameOrExtOrMime);
}
if (null == engine) {
engine = MANAGER.getEngineByMimeType(nameOrExtOrMime);
}
if (null == engine) {
throw new NullPointerException(StrUtil.format("Script for [{}] not support !", nameOrExtOrMime));
}
return engine;
}
/**
* 获得非单例的 Javascript引擎 {@link JavaScriptEngine}
*
* @return {@link JavaScriptEngine}
*/
public static JavaScriptEngine getJavaScriptEngine() {
return new JavaScriptEngine();
}
/**
* 获得单例的JavaScript引擎
*
* @return Javascript引擎
* @since 5.2.5
*/
public static ScriptEngine getJsEngine() {
return getScript("js");
}
/**
* 创建新的JavaScript引擎
*
* @return Javascript引擎
* @since 5.2.6
*/
public static ScriptEngine createJsEngine() {
return createScript("js");
}
/**
* 获得单例的Python引擎
* 需要引入org.python:jython
*
* @return Python引擎
* @since 5.2.5
*/
public static ScriptEngine getPythonEngine() {
System.setProperty("python.import.site", "false");
return getScript("python");
}
/**
* 创建Python引擎
* 需要引入org.python:jython
*
* @return Python引擎
* @since 5.2.6
*/
public static ScriptEngine createPythonEngine() {
System.setProperty("python.import.site", "false");
return createScript("python");
}
/**
* 获得单例的Lua引擎
* 需要引入org.luaj:luaj-jse
*
* @return Lua引擎
* @since 5.2.5
*/
public static ScriptEngine getLuaEngine() {
return getScript("lua");
}
/**
* 创建Lua引擎
* 需要引入org.luaj:luaj-jse
*
* @return Lua引擎
* @since 5.2.6
*/
public static ScriptEngine createLuaEngine() {
return createScript("lua");
}
/**
* 获得单例的Groovy引擎
* 需要引入org.codehaus.groovy:groovy-all
*
* @return Groovy引擎
* @since 5.2.5
*/
public static ScriptEngine getGroovyEngine() {
return getScript("groovy");
}
/**
* 创建Groovy引擎
* 需要引入org.codehaus.groovy:groovy-all
*
* @return Groovy引擎
* @since 5.2.6
*/
public static ScriptEngine createGroovyEngine() {
return createScript("groovy");
}
/**
* 执行Javascript脚本，返回Invocable，此方法分为两种情况：
*
*
* - 执行的脚本返回值是可执行的脚本方法
* - 脚本为函数库，则ScriptEngine本身为可执行方法
*
*
* @param script 脚本内容
* @return 执行结果
* @throws ScriptRuntimeException 脚本异常
* @since 5.3.6
*/
public static Invocable evalInvocable(String script) throws ScriptRuntimeException {
final ScriptEngine jsEngine = getJsEngine();
final Object eval;
try {
eval = jsEngine.eval(script);
} catch (ScriptException e) {
throw new ScriptRuntimeException(e);
}
if(eval instanceof Invocable){
return (Invocable)eval;
} else if(jsEngine instanceof Invocable){
return (Invocable)jsEngine;
}
throw new ScriptRuntimeException("Script is not invocable !");
}
/**
* 执行有返回值的Javascript脚本
*
* @param script 脚本内容
* @return 执行结果
* @throws ScriptRuntimeException 脚本异常
* @since 3.2.0
*/
public static Object eval(String script) throws ScriptRuntimeException {
try {
return getJsEngine().eval(script);
} catch (ScriptException e) {
throw new ScriptRuntimeException(e);
}
}
/**
* 执行有返回值的脚本
*
* @param script 脚本内容
* @param context 脚本上下文
* @return 执行结果
* @throws ScriptRuntimeException 脚本异常
* @since 3.2.0
*/
public static Object eval(String script, ScriptContext context) throws ScriptRuntimeException {
try {
return getJsEngine().eval(script, context);
} catch (ScriptException e) {
throw new ScriptRuntimeException(e);
}
}
/**
* 执行有返回值的脚本
*
* @param script 脚本内容
* @param bindings 绑定的参数
* @return 执行结果
* @throws ScriptRuntimeException 脚本异常
* @since 3.2.0
*/
public static Object eval(String script, Bindings bindings) throws ScriptRuntimeException {
try {
return getJsEngine().eval(script, bindings);
} catch (ScriptException e) {
throw new ScriptRuntimeException(e);
}
}
/**
* 执行JS脚本中的指定方法
*
* @param script js脚本
* @param func 方法名
* @param args 方法参数
* @return 结果
* @since 5.3.6
*/
public static Object invoke(String script, String func, Object... args) {
final Invocable eval = evalInvocable(script);
try {
return eval.invokeFunction(func, args);
} catch (ScriptException | NoSuchMethodException e) {
throw new ScriptRuntimeException(e);
}
}
/**
* 编译Javascript脚本
*
* @param script 脚本内容
* @return {@link CompiledScript}
* @throws ScriptRuntimeException 脚本异常
* @since 3.2.0
*/
public static CompiledScript compile(String script) throws ScriptRuntimeException {
try {
return compile(getJsEngine(), script);
} catch (ScriptException e) {
throw new ScriptRuntimeException(e);
}
}
/**
* 编译Javascript脚本
*
* @param engine 引擎
* @param script 脚本内容
* @return {@link CompiledScript}
* @throws ScriptException 脚本异常
*/
public static CompiledScript compile(ScriptEngine engine, String script) throws ScriptException {
if (engine instanceof Compilable) {
final Compilable compEngine = (Compilable) engine;
return compEngine.compile(script);
}
return null;
}
}
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