fileappender.java

JAVA实现的一个类库

package cn.edu.nju.software.sd.cll;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
// </editor-fold> 
/**
 * class FileAppender,as the class Console,impements the interface Appender
 * Dealing with the file input.
 */
public class FileAppender implements Appender {

    // <editor-fold defaultstate="collapsed" desc=" UML Marker "> 
    // #[regen=yes,id=DCE.D45FAE28-B82C-109D-6194-281E3232603B]
    // </editor-fold> 
    private String Destination;
    // @SuppressWarnings("unused")
	//private String name;
    // <editor-fold defaultstate="collapsed" desc=" UML Marker "> 
    // #[regen=yes,id=DCE.8E27525E-6014-0660-AD54-D9FD9A591E4D]
    // </editor-fold> 
    private Layout layout;

 
// public FileAppender(String name,Layout layout, String Destination){
//		this.name=name;
//		this.layout=layout;
//		this.Destination=Destination;
//	}
    /**
     * Default construct.
     */
          public FileAppender(Layout layout, String substring) {
	// TODO Auto-generated c 
    		this.layout=layout;
       		this.Destination=substring;
       
}
          /**
           * setLayout method.to hidden the private ins'layout'
           */


		public void setLayout(Layout layout)  {
                    this.layout=layout;
        }
          
          /**
           * doLog,the real function to deal with the 'update' in the observer pattern.
           * @param message
           * @param logger
           */
public void doLog(String message,Logger logger){
	PrintWriter outputStream=null;
		try {
			outputStream=new PrintWriter(new FileOutputStream(Destination,true));
			
		} catch (FileNotFoundException e) {
			System.out.println("Open file failed:  "+Destination);
			int i=Destination.lastIndexOf("/");
			
			File file=new File(Destination.substring(0,i));
			file.mkdirs();
		}
		outputStream.println(this.layout.format(message, logger));
		outputStream.close();
	}
 

/**
 * realize of the method in the interface 'Appender' 
 */
    public void update(Logger logger,String message) {
        
         doLog(message,logger);
    }

    

}