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                # 攔截過濾器模式 攔截過濾器模式(Intercepting Filter Pattern)用于對應用程序的請求或響應做一些預處理/后處理。定義過濾器,并在把請求傳給實際目標應用程序之前應用在請求上。過濾器可以做認證/授權/記錄日志,或者跟蹤請求,然后把請求傳給相應的處理程序。以下是這種設計模式的實體。 * **過濾器(Filter)** - 過濾器在請求處理程序執行請求之前或之后,執行某些任務。 * **過濾器鏈(Filter Chain)** - 過濾器鏈帶有多個過濾器,并在 Target 上按照定義的順序執行這些過濾器。 * **Target** - Target 對象是請求處理程序。 * **過濾管理器(Filter Manager)** - 過濾管理器管理過濾器和過濾器鏈。 * **客戶端(Client)** - Client 是向 Target 對象發送請求的對象。 ## 實現 我們將創建 _FilterChain_、_FilterManager_、_Target_、_Client_ 作為表示實體的各種對象。_AuthenticationFilter_ 和 _DebugFilter_ 表示實體過濾器。 _InterceptingFilterDemo_,我們的演示類使用 _Client_ 來演示攔截過濾器設計模式。 ![攔截過濾器模式的 UML 圖](https://box.kancloud.cn/2015-12-13_566cdfc30577d.jpg) ## 步驟 1 創建過濾器接口 Filter。 _Filter.java_ ``` public interface Filter { public void execute(String request); } ``` ## 步驟 2 創建實體過濾器。 _AuthenticationFilter.java_ ``` public class AuthenticationFilter implements Filter { public void execute(String request){ System.out.println("Authenticating request: " + request); } } ``` _DebugFilter.java_ ``` public class DebugFilter implements Filter { public void execute(String request){ System.out.println("request log: " + request); } } ``` ## 步驟 3 創建 Target。 _Target.java_ ``` public class Target { public void execute(String request){ System.out.println("Executing request: " + request); } } ``` ## 步驟 4 創建過濾器鏈。 _FilterChain.java_ ``` import java.util.ArrayList; import java.util.List; public class FilterChain { private List<Filter> filters = new ArrayList<Filter>(); private Target target; public void addFilter(Filter filter){ filters.add(filter); } public void execute(String request){ for (Filter filter : filters) { filter.execute(request); } target.execute(request); } public void setTarget(Target target){ this.target = target; } } ``` ## 步驟 5 創建過濾管理器。 _FilterManager.java_ ``` public class FilterManager { FilterChain filterChain; public FilterManager(Target target){ filterChain = new FilterChain(); filterChain.setTarget(target); } public void setFilter(Filter filter){ filterChain.addFilter(filter); } public void filterRequest(String request){ filterChain.execute(request); } } ``` ## 步驟 6 創建客戶端 Client。 _Client.java_ ``` public class Client { FilterManager filterManager; public void setFilterManager(FilterManager filterManager){ this.filterManager = filterManager; } public void sendRequest(String request){ filterManager.filterRequest(request); } } ``` ## 步驟 7 使用 _Client_ 來演示攔截過濾器設計模式。 _FrontControllerPatternDemo.java_ ``` public class InterceptingFilterDemo { public static void main(String[] args) { FilterManager filterManager = new FilterManager(new Target()); filterManager.setFilter(new AuthenticationFilter()); filterManager.setFilter(new DebugFilter()); Client client = new Client(); client.setFilterManager(filterManager); client.sendRequest("HOME"); } } ``` ## 步驟 8 驗證輸出。 ``` Authenticating request: HOME request log: HOME Executing request: HOME ```
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