直接上代碼Filter.java
public interface Filter { // 過濾器 public void doFilter(Request request,Response response,FilterChain chain); }
FilterChain.java
public class FilterChain { // 存放所有的過濾器 private List<Filter> filters ; // 記錄當前過濾索引 private int index; // 過濾鏈初始化 public FilterChain() { filters = new ArrayList<Filter>(10 ); } public void addFilter(Filter filter) { filters.add(filter); } /** * 迭代過濾 */ public void doFilter(Request request,Response response) { if ( index >= filters.size() ) return ; filters.get( index ++ ).doFilter(request, response, this ); } }
Request.java
public class Request { private String value; public String getValue() { return value; } public void setValue(String value) { this .value = value; } @Override public String toString() { return this .value; } }
Response.java
public class Response { private String value; public String getValue() { return value; } public void setValue(String value) { this .value = value; } @Override public String toString() { return this .value; } }
FilterOne.java
public class FilterOne implements Filter{ /** * 過濾FUCK字符 */ @Override public void doFilter(Request request, Response response, FilterChain chain) { System.out.println( "進入過濾器FilterOne---------------------------------------" ); // 執行下一個過濾器 chain.doFilter(request, response); System.out.println( "出去過濾器FilterOne---------------------------------------" ); } }
FilterTwo.java
public class FilterTwo implements Filter{ @Override public void doFilter(Request request, Response response, FilterChain chain) { System.out.println( "進入過濾器FilterTwo---------------------------------------" ); // 執行下一個過濾器 chain.doFilter(request, response); System.out.println( "出去過濾器FilterTwo---------------------------------------" ); } }
Test.java
public class Test { public static void main(String[] args) { FilterChain chain = new FilterChain(); chain.addFilter( new FilterOne()); chain.addFilter( new FilterTwo()); chain.doFilter( new Request(), new Response() ); } }
運行結果
進入過濾器FilterOne--------------------------------------- 進入過濾器FilterTwo --------------------------------------- 出去過濾器FilterTwo --------------------------------------- 出去過濾器FilterOne ---------------------------------------
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