链式处理

Posted 2022-06-27 gucl

public abstract class AbstractHandler 

    private static AbstractHandler handler = new Handler1();

    static 
        handler.setNextHandler(new Handler2())
                .setNextHandler(new Handler3());
    

    private AbstractHandler nextHandler;

    protected void handle()
        if(this.nextHandler != null)
            this.nextHandler.handle();
        
    

/**
 *
 * 流程链前置日志
 */
protected String getPreLog() 
    return "handle";

public AbstractHandler setNextHandler(AbstractHandler nextHandler)  this.nextHandler = nextHandler; return this.nextHandler;  public static AbstractHandler getHandler() return handler;  

 

public class Handler1 extends AbstractHandler
    @Override
    protected void handle() 
        System.out.println("handle-1");
        super.handle();
    

public class Test 
    public static void main(String[] args) 
        AbstractHandler.getHandler().handle();