“自定义MVC原理解析与示例：打造优雅、可定制化的Java应用程序”（下）

package com.yuan.framework;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * Action的子类 主要承载的是Book的增删改查
 * @author yuanh
 *
 */
public class BookAction extends Action {
  public String add(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("增加");
    return "toList";
  }
  public String del(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("删除");
    return "toList";
  }
  public String edit(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("修改");
    return "toList";
  }
  public String sellist(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("查询");
    return "List";
  }
}
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32

package com.yuan.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import com.yuan.framework.model.ActionModel;
import com.yuan.framework.model.ConfigModel;
import com.yuan.framework.model.ConfigModelFactory;
import com.yuan.framework.model.ForwardModel;
@WebServlet("*.action")
public class DispathServlet extends HttpServlet{
  public Map<String, Action> map = new HashMap<>();
  private ConfigModel configModel;
  @Override
  public void init() throws ServletException {
    try {
      configModel = ConfigModelFactory.build("/mvc.xml");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    doPost(req, resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      //http://localhost:8080/Y1_J2EE_Web/book.action
      String uri = req.getRequestURI(); 
      uri = uri.substring(uri.lastIndexOf("/"), uri.lastIndexOf("."));
      ActionModel actionModel = configModel.pop(uri);
      if(actionModel==null)
        throw new RuntimeException("action not config");
      Action action;
      try {
        action = (Action) Class.forName(actionModel.getType()).newInstance();
        if(action instanceof ModelDrivern) {
          ModelDrivern md = (ModelDrivern) action;
          Object bean = md.getModel();
          Map<String, String[]> map = req.getParameterMap();
          BeanUtils.populate(bean, map);
        }
        String execute = action.execute(req, resp);
        ForwardModel forwardModel = actionModel.pop(execute);
        if(forwardModel!=null) {
          boolean redirect = forwardModel.isRedirect();
          String path = forwardModel.getPath();
          if(redirect) {
            resp.sendRedirect(req.getContextPath()+"/"+path);
          }else {
            req.getRequestDispatcher(path).forward(req, resp);
          }
        }
      } catch (Exception e) {
        e.printStackTrace();
      } 
  }
}
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• 51
• 52
• 53
• 54
• 55
• 56
• 57
• 58
• 59
• 60
• 61
• 62
• 63
• 64
• 65
• 66
• 67
• 68
• 69
• 70
• 71
• 72
• 73
• 74
• 75
• 76
• 77
• 78
• 79
• 80
• 81