Java SE 6之脚本引擎 让程序如虎添翼(1)

import javax.script.*;
import java.io.*;
import java.util.*;
import static java.lang.System.*;
public class ListScriptEngines 
{
　public static void main(String args[]) 
　{
ScriptEngineManager manager = new ScriptEngineManager();
// 得到所有的脚本引擎工厂
List<ScriptEngineFactory> factories = manager.getEngineFactories();
// 这是Java SE 5 和Java SE 6的新For语句语法
for (ScriptEngineFactory factory: factories) 
{
　// 打印脚本信息
　out.printf("Name: %s%n" +
"Version: %s%n" +
"Language name: %s%n" +
"Language version: %s%n" +
"Extensions: %s%n" +
"Mime types: %s%n" +
"Names: %s%n",
factory.getEngineName(),
factory.getEngineVersion(),
factory.getLanguageName(),
factory.getLanguageVersion(),
factory.getExtensions(),
factory.getMimeTypes(),
factory.getNames());
　// 得到当前的脚本引擎
　ScriptEngine engine = factory.getScriptEngine();
}
　}
} 

Name: Mozilla Rhino
Version: 1.6 release 2
Language name: ECMAScript
Language version: 1.6
Extensions: [js]
Mime types: [application/javascript, application/ecmascript, text/javascript, 
text/ecmascript]
Names: [js, rhino, JavaScript, javascript, ECMAScript, ecmascript] 

ScriptEngine engine = manager.getEngineByExtension("js"); 

ScriptEngine engine = manager.getEngineByMimeType("text/javascript"); 

ScriptEngine engine = manager.getEngineByName("javascript"); 

import javax.script.*;
import java.io.*;
import static java.lang.System.*;
public class FirstJavaScript 
{
　public static void main(String args[]) 
　{
ScriptEngineManager manager = new ScriptEngineManager();
// 得到javascript脚本引擎
ScriptEngine engine = manager.getEngineByName("javascript");
try 
{
　// 开始运行脚本，并返回当前的小时
　Double hour = (Double)engine.eval("var date = new Date();" +"date.getHours();");
　String msg;
　// 将小时转换为问候信息
　if (hour < 10) 
　{
msg = "上午好";
　} 
　else if (hour < 16) 
　{
msg = "下午好";
　} 
　else if (hour < 20) 
　{
msg = "晚上好";
　} 
　else 
　{
msg = "晚安";
　}
　out.printf("小时 %s: %s%n", hour, msg);
}
catch (ScriptException e) 
{
　err.println(e);
}
　}
}