javax.script.ScriptEngine.eval()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中javax.script.ScriptEngine.eval()方法的一些代码示例，展示了ScriptEngine.eval()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ScriptEngine.eval()方法的具体详情如下：
包路径：javax.script.ScriptEngine
类名称：ScriptEngine
方法名：eval

ScriptEngine.eval介绍

[英]Evaluates a script obtained using the specified reader as the script source. Returns null for scripts that don't return a value.
[中]计算使用指定读取器作为脚本源获得的脚本。对于不返回值的脚本，返回null。

代码示例

代码示例来源：origin: stackoverflow.com

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;

public class Test {
 public static void main(String[] args) throws Exception{
  ScriptEngineManager mgr = new ScriptEngineManager();
  ScriptEngine engine = mgr.getEngineByName("JavaScript");
  String foo = "40+2";
  System.out.println(engine.eval(foo));
  } 
}

代码示例来源：origin: stackoverflow.com

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
Object result = engine.eval("4*5");

代码示例来源：origin: stackoverflow.com

if(Platform.isMac()) {
   final String script="tell application \"System Events\"\n" +
       "\tname of application processes whose frontmost is tru\n" +
       "end";
   ScriptEngine appleScript=new ScriptEngineManager().getEngineByName("AppleScript");
   String result=(String)appleScript.eval(script);
   System.out.println(result);
 }

代码示例来源：origin: shekhargulati/java8-the-missing-tutorial

public static void main(String[] args) throws ScriptException {
  NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
  ScriptEngine nashorn = factory.getScriptEngine(new NoJavaFilter());
  Integer eval = (Integer) nashorn.eval("var HashMap = Java.type('java.util.HashMap')");
  System.out.println(eval);
}

代码示例来源：origin: lenskit/lenskit

public static void main(String[] args) throws IOException, ScriptException {
    File scriptFile = new File(args[0]);
    ScriptEngineManager sem = new ScriptEngineManager();
    String ext = Files.getFileExtension(scriptFile.getName());
    ScriptEngine engine = sem.getEngineByExtension(ext);
    engine.put("cmdArgs", Arrays.asList(args).subList(1, args.length));
    try (Reader reader = Files.newReader(scriptFile, Charsets.UTF_8)) {
      engine.eval(reader);
    }
  }
}

代码示例来源：origin: jwpttcg66/NettyGameServer

/**
 * 执行指定的脚本内容
 *
 * @param content    脚本内容
 * @param params    执行参数
 * @return            脚本执行结果的返回值
 */
public static Object executeScriptContent(String content,
    Map<String, Object> params) {
  ScriptEngine engine = manager.getEngineByName("JavaScript");
  if (params != null) {
    for (Map.Entry<String, Object> pair : params.entrySet()) {
      engine.put(pair.getKey(), pair.getValue());
    }
  }
  try {
    return engine.eval(content);
  } catch (ScriptException e) {
    logger.error("", e);
  }
  return null;
}

代码示例来源：origin: internetarchive/heritrix3

@Override
protected void innerProcess(CrawlURI curi) {
  // depending on previous configuration, engine may 
  // be local to this thread or shared
  ScriptEngine engine = getEngine(); 
  synchronized(engine) {
    // synchronization is harmless for local thread engine,
    // necessary for shared engine
    engine.put("curi",curi);
    engine.put("appCtx", appCtx);
    try {
      engine.eval("process(curi)");
    } catch (ScriptException e) {
      logger.log(Level.WARNING,e.getMessage(),e);
    } finally { 
      engine.put("curi", null);
      engine.put("appCtx", null);
    }
  }
}

代码示例来源：origin: stackoverflow.com

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Test {

  public static void main(String[] args) throws Exception {
    ScriptEngineManager factory = new ScriptEngineManager();
    ScriptEngine engine = factory.getEngineByName("JavaScript");

    engine.eval("value = 10");
    Boolean greaterThan5 = (Boolean) engine.eval("value > 5");
    Boolean lessThan5 = (Boolean) engine.eval("value < 5");

    System.out.println("10 > 5? " + greaterThan5); // true
    System.out.println("10 < 5? " + lessThan5); // false
  }
}

代码示例来源：origin: stackoverflow.com

private static final String FUNCTIONS =
  "function() {" +
  "  return \"Hello\";" +
  "}";

public static void main(String... args) throws Exception {
  ScriptEngine engine = new ScriptEngineManager().getEngineByMimeType("text/javascript");

  // Compile common functions once
  CompiledScript compiled = ((Compilable) engine).compile(FUNCTIONS);
  Object sayHello = compiled.eval();

  // Load users' script each time
  SimpleBindings global = new SimpleBindings();
  global.put("sayHello", sayHello);
  String script = "sayHello()";
  System.out.println(engine.eval(script, global));
}

代码示例来源：origin: qiurunze123/miaosha

private static int calc(String exp) {
  try {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");
    Integer catch1 = (Integer)engine.eval(exp);
    return catch1.intValue();
  }catch(Exception e) {
    e.printStackTrace();
    return 0;
  }
}

代码示例来源：origin: lenskit/lenskit

private void writeSvgFile(DAGNode<Component, Dependency> graph, File outFile) throws IOException, LenskitCommandException {
  StringWriter sw = new StringWriter();
  logger.info("writing graph to memory");
  GraphDumper.renderGraph(graph, sw);
  String dotSrc = sw.toString();
  logger.debug("setting up script engine");
  ScriptEngineManager sem = new ScriptEngineManager();
  ScriptEngine engine = sem.getEngineByMimeType("text/javascript");
  try (InputStream istr = Graph.class.getResourceAsStream("/META-INF/resources/webjars/viz.js/1.5.1/viz.js");
     Reader rdr = new InputStreamReader(istr)) {
    logger.debug("loading Viz.js");
    engine.put(ScriptEngine.FILENAME, "viz.js");
    engine.eval(rdr);
  } catch (ScriptException e) {
    logger.error("error loading Viz.js", e);
    throw new LenskitCommandException("Could not load Viz.js", e);
  }
  engine.put("dotSrc", dotSrc);
  engine.put("outFile", outFile);
  try (InputStream istr = Graph.class.getResourceAsStream("render-graph.js");
     Reader rdr = new InputStreamReader(istr)) {
    logger.info("rendering graph to {}", outFile);
    engine.put(ScriptEngine.FILENAME, "render-graph.js");
    engine.eval(rdr);
  } catch (ScriptException e) {
    logger.error("error evaluating render script", e);
    throw new LenskitCommandException("could not evaluate SVG renderer", e);
  }
}

代码示例来源：origin: jwpttcg66/NettyGameServer

ScriptEngine engine = manager.getEngineByName("JavaScript");
if (params != null) {
  for (Map.Entry<String, Object> pair : params.entrySet()) {
    engine.put(pair.getKey(), pair.getValue());
  reader = new InputStreamReader(new FileInputStream(path),
      STRING_CHARSET);
  return engine.eval(reader);
} catch (FileNotFoundException | UnsupportedEncodingException | ScriptException e) {
  logger.error("", e);

代码示例来源：origin: internetarchive/heritrix3

@Override
public DecideResult innerDecide(CrawlURI uri) {
  // depending on previous configuration, engine may 
  // be local to this thread or shared
  ScriptEngine engine = getEngine(); 
  synchronized(engine) {
    // synchronization is harmless for local thread engine,
    // necessary for shared engine
    try {
      engine.put("object",uri);
      engine.put("appCtx", appCtx);
      return (DecideResult)engine.eval("decisionFor(object)");
    } catch (ScriptException e) {
      logger.log(Level.WARNING,e.getMessage(),e);
      return DecideResult.NONE;
    } finally {
      engine.put("object", null);
      engine.put("appCtx", null);
    }
  }
}

代码示例来源：origin: shekhargulati/java8-the-missing-tutorial

public static void main(String[] args) throws ScriptException {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine nashorn = manager.getEngineByName("nashorn");
    Integer eval = (Integer) nashorn.eval("10 + 20");
    System.out.println(eval);
  }
}

代码示例来源：origin: stackoverflow.com

ScriptEngineManager factory = new ScriptEngineManager();
 ScriptEngine engine = factory.getEngineByName("JavaScript");
 engine.eval("print('Hello, World')");

代码示例来源：origin: oblac/jodd

protected String run(String html, String query) throws ScriptException {
  Jerry doc = Jerry.jerry(html);
  scriptEngine.put("doc", doc);
  scriptEngine.eval(query);
  return doc.html();
}

代码示例来源：origin: stackoverflow.com

import javax.script.*;
import java.util.*;

public class Main {
  public static void main(String[] args) throws Exception {
    ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
    Map<String, Object> vars = new HashMap<String, Object>();
    vars.put("x", 2);
    vars.put("y", 1);
    vars.put("z", 3);
    System.out.println("result = "+engine.eval("x + y + z", new SimpleBindings(vars)));
  }
}

代码示例来源：origin: rapidoid/rapidoid

@SuppressWarnings("unchecked")
public static <T> T eval(String js, Map<String, ?> bindings) throws ScriptException {
  ScriptEngineManager factory = new ScriptEngineManager();
  ScriptEngine engine = factory.getEngineByName("JavaScript");
  if (bindings != null) {
    Map<String, Object> map = U.cast(bindings);
    return (T) engine.eval(js, new SimpleBindings(map));
  } else {
    return (T) engine.eval(js);
  }
}

代码示例来源：origin: bluejoe2008/openwebflow

@Override
public void notify(UserDetailsEntity[] users, Task task) throws Exception
{
  for (UserDetailsEntity user : users)
  {
    if (user == null)
      continue;
    ScriptEngine scriptEngine = new JuelScriptEngineFactory().getScriptEngine();
    scriptEngine.put("user", user);
    scriptEngine.put("task", task);
    String email = user.getProperty(UserDetailsEntity.STRING_PROPERTY_EMAIL);
    if (email != null)
    {
      _mailSender.sendMail(email, (String) scriptEngine.eval(_subjectTemplate),
        (String) scriptEngine.eval(_messageTemplate));
    }
  }
}

代码示例来源：origin: shekhargulati/java8-the-missing-tutorial

public static void main(String[] args) throws ScriptException {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine nashorn = manager.getEngineByName("nashorn");

    Bindings bindings = new SimpleBindings(Stream.of(
        new SimpleEntry<>("a", 10),
        new SimpleEntry<>("b", 20))
        .collect(toMap(SimpleEntry::getKey, SimpleEntry::getValue)));
    Double eval = (Double) nashorn.eval("a + b", bindings);
    System.out.println(eval);
  }
}

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