//*******************The Log class
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.uitl.Date;
import java.text.DateFormat;

public class Log{
   private static final String filePath = PropertyReader.getResource("Log_File_Path");//Supposing we have define in the last ProperyReader class and the file
  
   public static final String EXCEPTION                  =   "Exception";
   public static final String CREATE_STAFF           =   "Create Staff";
   public static final String EDIT_STAFF                 =   "Edit Staff";
   public static final String DELETE_STAFF            =   "Delete Staff";
   public static final String RECORD_HAS_EXIST  =   "Record Has Exist";

   public static void log(String msg_type, Exception e){
      StringBuffer errMsg = new StringBuffer(e.toString);
     
      for(int i=0;i<e.getStackTrace().length;i++){
         errMsg.append("\n\t at");
         errMsg.append(e.getStackTrace()[i].toString);
      }
      log(msg_type,errMsg.toString());
      OptionPanel.showErrMsg("Sorry,System may have an error \n System will exit");
      System.exit(-1);
   }

  public static void log(String msg.type,Staff staff){
     String msg = null;
     if(msg_type == CREATE_STAFF){
         msg = staff.toString() + "has benn created";
     }else if(msg_type == EDIT_STAFF){
         msg = staff.toString() + "has been Changed";
     }else if(msg_type == DELETE_STAFF){
         msg = staff.toString() + "has been Deleted";
     }else if(msg_type == RECORD_HAS_EXIST){
         msg = staff.toString() + "has exist in the database";
     }
     log(msg_type,msg);
  }

  private static void log(String msg_type,String msg){
      BufferedWriter out = null;
      DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM);
     
      try{
        out = new BufferedWriter(new FileWriter(getLogFilePath(),true));//如果为 true，则将字节写入文件末尾处，而不是写入文件开始处
        out.write("["+df.format(new Date()) + "] <" + msg_type + "> :" + msg);
        out.newline();
        out.newline();
      }catch(IOException e){
          e.printStackTrace();
      }finally{
         try{
           if(out!=null){
              out.close();
           }
         }catch(IOException e){
            e.printStackTrace();
         }
      }
  }

  private static String getLogFilePath(){
     File logDir = new File(filePath);
     if(!logDir.exists()){
       logDir.mkdir();
     }
    
     int i = 1;
     String fileName = filePath + "log_";
     File file = new File(fileName + i + ".txt");
   
     while(file.exists() && file.length() > 30000L) {
         i++;
         file = new File(fileName + i + ".txt");
     }
   
      return fileName + i + ".txt"
  }
}

//*****************************The OptionPanel Dialog Class for the Log Class
import javax.swing.JOptionPane;

public class OptionPanel {
   private static final String appTitle = PropertyReader.getResource("App_Title");//suposing the file has been established and the property app-title stands for the name of application
   private static final MainFrame frame = MainFrame.getMainFrame();

   public static void showWarningMsg(String msg){
      JOptionPane.showMessageDialog(frame,msg,appTitle,JOptionPane.WARNING_MESSAGE);
   }
   public static void showErrMsg(String msg){
       JOptionPane.showMessageDialog(frame,msg,appTitle,JOptionPane.Error_MESSAGE);
   }
   public static int showConfirmMsg(String msg){
        return JOptionPane.showConfirmDialog(frame,msg,appTitle,JOptionPane.YES_NO_OPTON,JOptionPane.QUESTION_MESSAGE);
   }
}

In a project, we can write a class to read the properties.As following,

import java.io.InputStream;
import java.io.IOException;
import java.util.Properties;

public class PropertyReader{
   private static Properties property = null;
  
   static{
      InputSteam stream = null;
      try{
        stream=PropertyReader.class.getResourceAsStream("/resource/properties.properties");
        property = new Properties();
        property.load(stream);
      }catch(IOException e){
          e.printStackTrace();
      }finally{
          if(stream != null){
             try{
                stream.close();
             }catch(IOException e){
                e.printStackTrace();
             }           
          }
      }
   }
   public static String getResource(String key){
     if(property == null){
       return null;// init error;
     }
     
     return property.getProperty(key);
   }
}

Most developers have heard of, and possibly used, scripting languages such as Ruby, JavaScript, and Python. These dynamic languages are enjoying a resurgence in popularity, largely because of their flexibility and simplicity, and the productivity gains they promise.

Java 6 comes with built-in support for scripting languages. You can embed scripts in various scripting languages into your Java applications, passing parameters, evaluating expressions, and retrieving results. And you can do it all pretty seamlessly.

First of all, you obtain a new ScriptEngine object from a ScriptEngineManager, as shown here:

ScriptEngineManager manager = new ScriptEngineManager();


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

Each scripting language has its own unique identifier. The "js" here means you're dealing with JavaScript.

Now you can start having some fun. Interacting with a script is easy and intuitive. You can assign scripting variables using the put() method and evaluate the script using the eval() method,. which returns the most recently evaluated expression processed by the script. And that pretty much covers the essentials. Here's an example that puts it all together:

engine.put("cost", 1000);
String decision = (String) engine.eval(
"if ( cost >= 100){ " +
"decision = 'Ask the boss'; " +
"} else {" +
"decision = 'Buy it'; " +
"}");
assert ("Ask the boss".equals(decision));

You can do more than just pass variables to your scripts— you can also invoke Java classes from within your scripts. Using the importPackage() function enables you to import Java packages, as shown here:

				

        engine.eval("importPackage(java.util); " +
                    "today = new Date(); " +
                    "print('Today is ' + today);");

Another cool feature is the Invocable interface, which lets you invoke a function by name within a script. This lets you write libraries in scripting languages, which you can use by calling key functions from your Java application. You just pass the name of the function you want to call, an array of Objects for the parameters, and you're done! Here's an example:

				

        engine.eval("function calculateInsurancePremium(age) {...}");
        Invocable invocable = (Invocable) engine;
        Object result  = invocable.invokeFunction("calculateInsurancePremium",
                                     new Object[] {37});

You actually can do a fair bit more than what I've shown here. For example, you can pass a Reader object to the eval() method, which makes it easy to store scripts in external files, or bind several Java objects to JavaScript variables using a Map-like Binding object. You can also compile some scripting languages to speed up processing. But you probably get the idea that the integration with Java is smooth and well thought-out.

前几天好不容易下到了JDK6mustang，今天恰好有时间升级了一下Netbeans默认的JDK版本。这里简单的说明一下升级的方法。如果我 们不修改Netbeans的属性，需要在JavaPlatform manager中加入另一版本的类库。新建工程后如果要修改类库，还需要修改项目的类库属性，现在通过修改默认的JDK类库，便可方便很多，更不需要重新 安装NB。

我的NB装在D盘中，可以在该路径找到文件D:\Netbeans-5.5\etc\Netbeans.conf，我们将原有的默认类库netbeans_jdkhome="D:\Java\jdk1.5.0_07"修改为 netbeans_jdkhome="D:\Java\jdk1.6.0"便轻松的完成了升级，当然在tools-〉JavaPlatform manager〉中当然也可以将我们惯用的D:\Java\jdk1.5.0_07加入为可选用类库。

第三步，输入启动类。输入带有 main 方法的类名

今天在sun的网站上转了一圈，等了好几天的Visual Web Pack终于出来了.

先介绍一下

Creates a new Visual Web Pack project containing an empty web application. This project enables you to use Visual Web Pack features like the Visual Designer to drag and drop JSF components, visual and dialog box support for binding components to data providers, and generation of Java code and Web XML files. The project uses the IDE-generated build script to build, run, and debug your project.

创建一个可视化页面工程包 包含一个空白页面应用程序.这个工程能让你使用可视化开发包的各种属性，诸如用可视化设计工具拖放JSF(java server face)组件,可视化的对话框支持将组件数据源（或者数据提供者）绑定在一起，并且生成java代码和xml页面文件。这一工程由集成开发环境（IDE）生成的构建脚本来构造，执行和调试你的项目。

(翻译的不好请见谅)

还支持ajax，呵~~呵~~~。

最终装好的效果图:

全面支持拖放，呵呵，上次装了一个java studio creator结果运行死慢死慢的，这一次把这一功能转移到了netbeans挺好用，速度也不错，我这台笔记本都能挺过来，台式机估计没什么问题。

安装时要注意的地方:

1.netbeans必须为5.5正式版本，beta版本的检测不到。点击进入netbeans首页

2.下载JDK 5_60或者以后的版本我用的是JDK 5_09版本，安装的时候最好不要把原来的卸载，有时候老程序不认新的JDK。点击进入JDK下载页面

点击这里进入Visual Web Pack 的下载页面。