/** 
 * 抽象责任 
 */ 
public abstract class IFilter { 
  private IFilter successor; 
 
  public IFilter getSuccessor() { 
    return successor; 
  } 
 
  public void setSuccessor(IFilter successor) { 
    this.successor = successor; 
  } 
   
  public abstract void handleFilter(); 
   
  public abstract void handleFilter2(); 
} 

/** 
 * 具体责任 
 */ 
public class ConcreteFilter extends IFilter { 
   
  private String name; 
  public ConcreteFilter(String name) { 
    this.name = name; 
  } 
   
  @Override 
  public void handleFilter() { 
    /* 
     * 自己先处理，如有后继者，再由它处理一次 
     */ 
    System.out.println(name + " 处理了请求"); 
    if (getSuccessor() != null) { 
      getSuccessor().handleFilter(); 
    } 
  } 
   
  @Override 
  public void handleFilter2() { 
    /* 
     * 有后继者就后继者处理, 否则自己处理 
     */ 
    if (getSuccessor() != null) { 
      getSuccessor().handleFilter2(); 
    } else { 
      System.out.println(name + " 处理了请求"); 
    } 
  } 
} 

public class Test { 
  public static void main(String[] args) { 
    IFilter filter1 = new ConcreteFilter("permission-filter");//权限过滤 
    IFilter filter2 = new ConcreteFilter("suffix-filter");//后缀名过滤 
    IFilter filter3 = new ConcreteFilter("style-filter");//风格过滤 
    filter1.setSuccessor(filter2); 
    filter2.setSuccessor(filter3); 
    System.out.println("------以下是每一个处理者(包括后继者)都处理了, 顺序也是一级一级的传递------"); 
    filter1.handleFilter(); 
     
    System.out.println("------以下是交由最后一个后继者处理------"); 
    filter1.handleFilter2(); 
     
  } 
} 

------以下是每一个处理者(包括后继者)都处理了, 顺序也是一级一级的传递------ 
permission-filter 处理了请求 
suffix-filter 处理了请求 
style-filter 处理了请求 
------以下是交由最后一个后继者处理------ 
style-filter 处理了请求