logicservlet.java

MVC留言

package org.bob.control;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.bob.entity.DynamicEntity;
import org.bob.model.IDataAccess;
import org.bob.util.ObjectFactory;

public class LogicServlet extends HttpServlet {

	public void destroy() {
		super.destroy(); 
	}

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
			this.doPost(request, response);
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		/*request的getParameterMap方法是用于将请求中的所有参数以Map的形式返回
		  其中key是参数名,而值就是参数的值,不过要注意的是值是以String数组形式返回
		*/
		Map param=request.getParameterMap();
//		request.getAttributeNames();
		
		//获取类名
		String className=(String)request.getAttribute("requestName");
		//通过类名得到对象
		IDataAccess access=(IDataAccess)ObjectFactory.getObject(className);
		//要执行的方法
		String method=((String[])param.get("method"))[0];
		//根据具体情况执行相应的方法
		if("validate".equalsIgnoreCase(method)){
			DynamicEntity entity=new DynamicEntity();
			entity.setElement("USERNAME",((String[])param.get("username"))[0]);
			entity.setElement("PASSWORD",((String[])param.get("password"))[0]);
			String userid=null;
			try {
				userid=access.isExist(entity);
			} catch (Exception e) {
				e.printStackTrace();
			}
			if(userid!=null){
				entity.setElement("USERID",userid);
				request.getSession().setAttribute("user",entity);
				request.getRequestDispatcher("sendnote.jsp").forward(request,response);
			}else{
				request.setAttribute("error","用户名或密码错误!");
				request.getRequestDispatcher("login.jsp").forward(request,response);
			}
		}

		if("find".equalsIgnoreCase(method)){
			List list=null;
			try {
				list=access.find();
			} catch (Exception e) {
				e.printStackTrace();
			}
			request.setAttribute("list",list);
			request.getRequestDispatcher("showall.jsp").forward(request, response);
		}
		
		if("save".equalsIgnoreCase(method)){
			DynamicEntity entity=new DynamicEntity();
			entity.setElement("USERID",((String[])param.get("userid"))[0]);
			entity.setElement("TITLE",((String[])param.get("title"))[0]);
			entity.setElement("NOTE",((String[])param.get("note"))[0]);
			try {
				access.save(entity);
			} catch (Exception e) {
				e.printStackTrace();
			}
			request.getRequestDispatcher("sendnote.jsp").forward(request,response);
		}
	}

	
	public void init() throws ServletException {
		
	}

}