filterfactory.java

在学习完JAVA基础后,做的一个小小的项目.一个简单的聊天程序.呵呵,看看吧,那时候才刚刚接触到DAO,哎,惊叹的是设计思想. 呵呵,如果你也刚刚学完JAVA基础,有对SWING,AWT比较喜欢的话

package server.business.filter;
import java.io.*;
import java.util.*;
public class FilterFactory {
	private static FilterFactory instance=new FilterFactory();
	private FilterFactory(){}
	public static FilterFactory newInstance(){
		return instance;
	}
	//根据配置文件，生成过滤器链，返回头节点
	public Filter getFilter(){
		try {
			List<Filter> filters=new ArrayList<Filter>();
			FileReader fr=new FileReader("config/filter.config");
			BufferedReader in=new BufferedReader(fr);
			String s;
			while((s=in.readLine())!=null){
				Class c=Class.forName(s);
				Object o=c.newInstance();
				filters.add((Filter)o);
			}
			for(int i=0;i<filters.size()-1;i++){
				Filter f1=filters.get(i);
				Filter f2=filters.get(i+1);
				f1.setNext(f2);
			}
			return filters.get(0);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
		
	}
}