Thu, 26 Nov 2009 05:35:00 GMT

1�Q�Filter接口�Q�每个扩展都需要实现此接口

1 /**
2  * �q��o器。自定义的过滤器需要实现此接口

3  * 可以�Ҏ��需求决定是否允许��l�流转，如果需要，则调�?lt;br>
4  * chain.doFilter()�Ҏ��l�箋。如果不调用�Q�则责�Q铄��止�?br /> 5  *
6  * @author kzl
7  *
8  */
9 public interface Filter {
10     /**
11      * 执行�q��o
12      *
13      * @param chain
14      *            �q��o责�Q�?br /> 15      */
16     void doFilter(IFilterChain chain);
17 }
18

2:责�Q链接口，用来控制�q��o器是否��l�执�?br />

/**
* �q��o器责任链
*
* @author kzl
*
*/
public interface IFilterChain {
    /**
     * 执行�q��o
     */
    void doFilter();
}

3:�q��o器组�Q�用来添加自定义的过滤器

1 /**
2  * �q��o器组
3  *
4  * @author kzl
5  *
6  */
7 public interface FilterGroup {
8     /**
9      * ��d��q��o�?br /> 10      *
11      * @param filter
12      *            �q��o�?br /> 13      * @return �q�回此过滤器�l?允许�l�箋��d��
14      */
15     FilterGroup append(Filter filter);
16
17     /**
18      * 执行�q��o操作
19      *
20      * @param chain
21      *            �q��o器责任链
22      */
23     void doFilter(FilterChain chain);
24 }
25

下面�l�出��单的实现�c�：
1�Q�Filter1

1 import java.text.SimpleDateFormat;
2 import java.util.Date;
3
4 public class Filter1 implements Filter {
5
6     @Override
7     public void doFilter(IFilterChain chain) {
8         System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
9                 .format(new Date(1256819348330l)));
10         chain.doFilter();
11     }
12
13 }
14

2:FilterChain

/**
* �q��o器责任链
*
* @author kzl
*
*/
public class FilterChain implements IFilterChain {
    /**
     * �q��o器组
     */
    FilterGroup group;

    public FilterChain(FilterGroup group) {
        this.group = group;
    }

    @Override
    public void doFilter() {
        // �q��o器组执行
        group.doFilter(this);
    }
}

3:FilterGroup

1 import java.util.LinkedList;
2
3 public class FilterGroupImpl implements FilterGroup {
4     LinkedList<Filter> list = new LinkedList<Filter>();
5     int current = 0;
6
7     @Override
8     public synchronized FilterGroup append(Filter filter) {
9         list.add(filter);
10         return this;
11     }
12
13     @Override
14     public void doFilter(FilterChain chain) {
15         if (current < list.size()) {
16             list.get(current++).doFilter(chain);
17         }
18     }
19
20 }
21

4:最�l�组合�v来的main

1 public class Main {
2     public static void main(String[] args) {
3         FilterGroup group = new FilterGroupImpl();
4         group.append(new Filter1());
5         group.append(new Filter2());
6         FilterChain chain = new FilterChain(group);
7         chain.doFilter();
8     }
9 }
10

☆倚楼听雨�?/a> 2009-11-26 13:35 发表评论

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