/** * 简答脚本执行 * @throws Exception */
public static void evalScriptText() throws Exception{  //groovy.lang.Binding  Binding binding = new Binding();  GroovyShell shell = new GroovyShell(binding);  binding.setVariable("name", "zhangsan");  shell.evaluate("println 'Hello World! I am ' + name;");  //在script中,声明变量,不能使用def,否则scrope不一致.  shell.evaluate("date = new Date();");  Date date = (Date)binding.getVariable("date");  System.out.println("Date:" + date.getTime());  //以返回值的方式,获取script内部变量值,或者执行结果  //一个shell实例中,所有变量值,将会在此"session"中传递下去."date"可以在此后的script中获取  Long time = (Long)shell.evaluate("def time = date.getTime(); return time;");  System.out.println("Time:" + time);  binding.setVariable("list", new String[]{"A","B","C"});  //invoke method  String joinString = (String)shell.evaluate("def call(){return list.join(' - ')};call();");  System.out.println("Array join:" + joinString);  shell = null;  binding = null;
}

 /** * 当groovy脚本,为完整类结构时,可以通过执行main方法并传递参数的方式,启动脚本. */
public static void evalScriptAsMainMethod(){  String[] args = new String[]{"Zhangsan","10"};//main(String[] args)  Binding binding = new Binding(args);  GroovyShell shell = new GroovyShell(binding);  shell.evaluate("static void main(String[] args){ if(args.length != 2) return;println('Hello,I am ' + args[0] + ',age ' + args[1])}");  shell = null;  binding = null;
} 

 /** * 运行完整脚本 * @throws Exception */
public static void evalScriptTextFull() throws Exception{  StringBuffer buffer = new StringBuffer();  //define API  buffer.append("class User{")  .append("String name;Integer age;")  //.append("User(String name,Integer age){this.name = name;this.age = age};")  .append("String sayHello(){return 'Hello,I am ' + name + ',age ' + age;}}\n");  //Usage  buffer.append("def user = new User(name:'zhangsan',age:1);")  .append("user.sayHello();");  //groovy.lang.Binding  Binding binding = new Binding();  GroovyShell shell = new GroovyShell(binding);  String message = (String)shell.evaluate(buffer.toString());  System.out.println(message);  //重写main方法,默认执行  String mainMethod = "static void main(String[] args){def user = new User(name:'lisi',age:12);print(user.sayHello());}";  shell.evaluate(mainMethod);  shell = null;
}

     /** * 以面向"过程"的方式运行脚本 * @throws Exception */  public static void evalScript() throws Exception{  Binding binding = new Binding();  GroovyShell shell = new GroovyShell(binding);  //直接方法调用  //shell.parse(new File(//))  Script script = shell.parse("def join(String[] list) {return list.join('--');}");  String joinString = (String)script.invokeMethod("join", new String[]{"A1","B2","C3"});  System.out.println(joinString);  脚本可以为任何格式,可以为main方法,也可以为普通方法  //1) def call(){...};call();  //2) call(){...};  script = shell.parse("static void main(String[] args){i = i * 2;}");  script.setProperty("i", new Integer(10));  script.run();//运行,  System.out.println(script.getProperty("i"));  //the same as  System.out.println(script.getBinding().getVariable("i"));  script = null;  shell = null;  }  

     /** * from source file of *.groovy */  public static void parse() throws Exception{  GroovyClassLoader classLoader = new GroovyClassLoader(Thread.currentThread().getContextClassLoader());  File sourceFile = new File("D:\\TestGroovy.groovy");  Class testGroovyClass = classLoader.parseClass(new GroovyCodeSource(sourceFile));  GroovyObject instance = (GroovyObject)testGroovyClass.newInstance();//proxy  Long time = (Long)instance.invokeMethod("getTime", new Date());  System.out.println(time);  Date date = (Date)instance.invokeMethod("getDate", time);  System.out.println(date.getTime());  //here  instance = null;  testGroovyClass = null;  }  

     public static void load() throws Exception {  GroovyClassLoader classLoader = new GroovyClassLoader(Thread.currentThread().getContextClassLoader());  BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\TestGroovy.class"));  ByteArrayOutputStream bos = new ByteArrayOutputStream();  for(;;){  int i = bis.read();  if( i == -1){  break;  }  bos.write(i);  }  Class testGroovyClass = classLoader.defineClass(null, bos.toByteArray());  //instance of proxy-class  //if interface API is in the classpath,you can do such as:  //MyObject instance = (MyObject)testGroovyClass.newInstance()  GroovyObject instance = (GroovyObject)testGroovyClass.newInstance();  Long time = (Long)instance.invokeMethod("getTime", new Date());  System.out.println(time);  Date date = (Date)instance.invokeMethod("getDate", time);  System.out.println(date.getTime());  //here
    bis.close();  bos.close();  instance = null;  testGroovyClass = null;  }  

 <dependency>  <groupId>org.codehaus.groovy</groupId>  <artifactId>groovy</artifactId>  <version>2.1.6</version>
</dependency>
<dependency>  <groupId>org.codehaus.groovy</groupId>  <artifactId>groovy-jsr223</artifactId>  <version>2.1.6</version>
</dependency> 

 public static void evalScript() throws Exception{  ScriptEngineManager factory = new ScriptEngineManager();  //每次生成一个engine实例  ScriptEngine engine = factory.getEngineByName("groovy");  System.out.println(engine.toString());  assert engine != null;  //javax.script.Bindings  Bindings binding = engine.createBindings();  binding.put("date", new Date());  //如果script文本来自文件,请首先获取文件内容  engine.eval("def getTime(){return date.getTime();}",binding);  engine.eval("def sayHello(name,age){return 'Hello,I am ' + name + ',age' + age;}");  Long time = (Long)((Invocable)engine).invokeFunction("getTime", null);  System.out.println(time);  String message = (String)((Invocable)engine).invokeFunction("sayHello", "zhangsan",new Integer(12));  System.out.println(message);
}