韓信が将軍になる: 代表モード

//开发的同事进行抽象
public interface IEmployee {
    void doing(String command);
}
//下面假设有三哥员工
public class EmployeeA  implements  IEmployee{
    @Override
    public void doing(String command) {
        System.out.println("我是员工A，擅长做数据库设计，现在开始做" + command);
    }
}
public class EmployeeB implements IEmployee {
    @Override
    public void doing(String command) {
        System.out.println("我是员工B，擅长做架构，现在开始做" + command);
    }
}
public class EmployeeC implements IEmployee {
    @Override
    public void doing(String command) {
        System.out.println("我是员工C，擅长做业务，现在开始做" + command);
    }
}

import java.util.HashMap;
import java.util.Map;

public class Leader {

    private Map<String, IEmployee> employeeMap = new HashMap<>();
    //既然是项目经历，那他心里，肯定知道每个开发同事擅长的领域是什么
    public Leader() {
        employeeMap.put("数据库设计", new EmployeeA());
        employeeMap.put("架构设计", new EmployeeB());
        employeeMap.put("业务代码", new EmployeeC());
    }

    //leader接收到老板Boss的任务命令后
    public void doing(String command) {
        //项目经理通过任务命令，找到对应的开发同事，
        // 然后把对应任务明给这位同事，这位同事就可以去干活了
        employeeMap.get(command).doing(command);
    }
}

public class Boss {
    //Boss也得根据每个项目经理锁负责的领域进行任务分配
    public void command(String command, Leader leader) {
        leader.doing(command);
    }
}

public class DelegateDemoTest {
    public static void main(String[] args) {
        new Boss().command("架构设计", new Leader());
    }
}

我是员工B，擅长做架构，现在开始做架构设计

protected void doService(HttpServletRequest request, HttpServletResponse response) throws Exception {
    //转发、分派
    doDispatch(request, response);
}
/**
 * Process the actual dispatching to the handler.
 * 处理实际分派给处理程序
 * <p>The handler will be obtained by applying the servlet&#39;s HandlerMappings in order.
 * The HandlerAdapter will be obtained by querying the servlet&#39;s installed HandlerAdapters
 * to find the first that supports the handler class.
 * <p>All HTTP methods are handled by this method. It&#39;s up to HandlerAdapters or handlers
 * themselves to decide which methods are acceptable.
 * @param request current HTTP request
 * @param response current HTTP response
 * @throws Exception in case of any kind of processing failure
 */
protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
    ...
}