Java 设计模式 之 责任链模式

http://www.verejava.com/?id=16999052620463

package com.chain.theory;

public class TestHandler
{
    public static void main(String[] args)
    {
        Handler hrHandler=new HrHandler(null);
        Handler managerHandler=new ManagerHandler(hrHandler);
        Handler financeHandler=new FinanceHandler(managerHandler);
        Handler frontHandler=new FrontHandler(financeHandler);
        
        frontHandler.handleRequest("离职");
    }
}





package com.chain.theory;

public class ManagerHandler implements Handler
{
    private Handler nextHandler;
    
    public ManagerHandler(Handler nextHandler)
    {
        this.nextHandler=nextHandler;
    }
    

    @Override
    public void handleRequest(String request)
    {
        if("审批".equals(request))
        {
            System.out.println("经理审核完毕");
            if(nextHandler!=null)
                nextHandler.handleRequest("批准");
        }
        
    }

}





package com.chain.theory;

public class HrHandler implements Handler
{
    private Handler nextHandler;
    
    public HrHandler(Handler nextHandler)
    {
        this.nextHandler=nextHandler;
    }
    

    @Override
    public void handleRequest(String request)
    {
        if("批准".equals(request))
        {
            System.out.println("人事批准");
            if(nextHandler!=null)
                nextHandler.handleRequest("完毕");
        }
        
    }

}





package com.chain.theory;

public interface Handler
{
    public void handleRequest(String request);
}





package com.chain.theory;

public class FrontHandler implements Handler
{
    private Handler nextHandler;
    
    public FrontHandler(Handler nextHandler)
    {
        this.nextHandler=nextHandler;
    }
    

    @Override
    public void handleRequest(String request)
    {
        if("离职".equals(request))
        {
            System.out.println("离职申请");
            if(nextHandler!=null)
                nextHandler.handleRequest("审核");
        }
        
    }

}





package com.chain.theory;

public class FinanceHandler implements Handler
{
    private Handler nextHandler;
    
    public FinanceHandler(Handler nextHandler)
    {
        this.nextHandler=nextHandler;
    }
    

    @Override
    public void handleRequest(String request)
    {
        if("审核".equals(request))
        {
            System.out.println("财务审核完毕");
            if(nextHandler!=null)
                nextHandler.handleRequest("审批");
        }
        
    }

}

http://www.verejava.com/?id=16999052620463