Java-马士兵设计模式学习笔记-责任链模式-模拟处理Reques Response

一、目标

1.用Filter模拟处理Request、Response

2.思路细节技巧：

(1)Filter的doFilter方法改为doFilter(Request,Resopnse,FilterChain),有FilterChain引用，为利用FilterChain调用下一个Filter做准备

(2)FilterChain继承Filter,这样，FilterChain既是FilterChain又是Filter,那么FilterChain就可以调用Filter的方法doFilter(Request,Resopnse,FilterChain)

(3)FilterChain的doFilter(Request,Resopnse,FilterChain)中，有index标记了执行到第几个Filter,当所有Filter执行完后request处理后，就会return,以倒序继续执行response处理

 

二、代码

1.Filter.java

2.HTMLFilter.java

3.SensitiveFilter.java

4.FilterChian.java

5.Request.java

6.Response.java

7.Test.java

 

1.Filter.java

1 public interface Filter {
2     public void doFilter(Request request, Response response, FilterChain filterChain);
3 }

 

2.HTMLFilter.java

 1 public class HTMLFilter implements Filter {
 2 
 3     @Override
 4     public void doFilter(Request request, Response response,
 5             FilterChain filterChain) {
 6         request.setRequestStr(request.getRequestStr().replace('<', '[').replace(">", "]")+"---HTMLFilter()");
 7         filterChain.doFilter(request, response, filterChain);
 8         response.setResponseStr(response.getResponseStr()+"---HTMLFilter()");
 9     }
10 
11 }

 

3.SensitiveFilter.java

 1 public class SensitiveFilter implements Filter {
 2 
 3     @Override
 4     public void doFilter(Request request, Response response,
 5             FilterChain filterChain) {
 6         request.setRequestStr(request.getRequestStr().replace("敏感", "幸福")+"---SensitiveFilter()");
 7         filterChain.doFilter(request, response, filterChain);
 8         response.setResponseStr(response.getResponseStr()+"---SensitiveFilter()");
 9     }
10 
11 }

 

4.FilterChian.java

 1 public class FilterChain implements Filter {
 2 
 3     private List<Filter> filters = new ArrayList<Filter>();
 4     int index = 0;    //标记执行到第几个filter
 5     
 6     //把函数的返回值设为FilterChain，返回this,就能方便链式编写代码
 7     public FilterChain addFilter(Filter filter) {
 8         filters.add(filter);
 9         return this;
10     }
11 
12     public void doFilter(Request request, Response response, FilterChain fc) {
13         if(index == filters.size()) return ;
14         Filter f = filters.get(index);
15         index++;
16         f.doFilter(request, response, fc);
17     }
18 
19 }

 

5.Request.java

 1 public class Request {
 2 
 3     private String requestStr;
 4 
 5     public String getRequestStr() {
 6         return requestStr;
 7     }
 8 
 9     public void setRequestStr(String requestStr) {
10         this.requestStr = requestStr;
11     }
12     
13 }

 

6.Response.java

 1 public class Response {
 2 
 3     private String responseStr;
 4 
 5     public String getResponseStr() {
 6         return responseStr;
 7     }
 8 
 9     public void setResponseStr(String responseStr) {
10         this.responseStr = responseStr;
11     }
12     
13 }

 

7.Test.java

 1 public class Test {
 2 
 3     @org.junit.Test
 4     public void testFilter(){
 5         
 6         String msg = "<html>敏感字眼</html>"; 
 7         
 8         Request request = new Request();
 9         request.setRequestStr(msg);
10         Response response = new Response();
11         response.setResponseStr("response------------");
12         
13         FilterChain fc = new FilterChain();
14         fc.addFilter(new HTMLFilter()).addFilter(new SensitiveFilter());
15         
16         fc.doFilter(request, response, fc);
17         System.out.println(request.getRequestStr());
18         System.out.println(response.getResponseStr());
19         
20     }
21 
22 }

 

三、执行结果

 

posted @ 2015-06-20 20:55  shamgod  阅读(1927)  评论(0)  编辑  收藏  举报
haha