在jsp中应用MVC模型

在这里通过一个例子来把MVC的思路理清一下;M:即模型层;V:即视图层；C：即控制层；

在jsp中；jsp页面是视图层。而javabean是模型层，Servlet是控制层：

比如我在数据里有一个文章的表，表的字段有:Artical_Id,Artical_Name ,Artical_Content,Artical_Date,Artical_Glancenumber,ArticalTypel_Id ,User_Id,Artical_Character 

创建一个javabean类来封装表的字段;

package com.yxq.valuebean;

import java.util.Date;

public class Model_Artical {
    private Integer Artical_Id;
    private String Artical_Name ;
    private String Artical_Content;
    private Date  Artical_Date  ;
    private Integer Artical_Glancenumber ;
    private Integer ArticalTypel_Id  ;
    private Integer User_Id;
    private String  Artical_Character;
    public String getArtical_Character() {
        return Artical_Character;
    }
    public String getArtical_Character(int number) {
        if(Artical_Character.length()>30){
            return Artical_Character.substring(0, number);
        }
        return Artical_Character;
    }
    public void setArtical_Character(String artical_Character) {
        Artical_Character = artical_Character;
    }
    public Integer getArtical_Id() {
        return Artical_Id;
    }
    public void setArtical_Id(Integer artical_Id) {
        Artical_Id = artical_Id;
    }
    public String getArtical_Name() {
        return Artical_Name;
    }
    public void setArtical_Name(String artical_Name) {
        Artical_Name = artical_Name;
    }
    public String getArtical_Content() {
        return Artical_Content;
    }
    
    public void setArtical_Content(String artical_Content) {
        Artical_Content = artical_Content;
    }
    public Date getArtical_Date() {
        return Artical_Date;
    }
    public void setArtical_Date(Date artical_Date) {
        Artical_Date = artical_Date;
    }
    public Integer getArtical_Glancenumber() {
        return Artical_Glancenumber;
    }
    public void setArtical_Glancenumber(Integer artical_Glancenumber) {
        Artical_Glancenumber = artical_Glancenumber;
    }
    public Integer getArticalTypel_Id() {
        return ArticalTypel_Id;
    }
    public void setArticalTypel_Id(Integer articalTypel_Id) {
        ArticalTypel_Id = articalTypel_Id;
    }
    public Integer getUser_Id() {
        return User_Id;
    }
    public void setUser_Id(Integer user_Id) {
        User_Id = user_Id;
    }
    
}

jsp页面中请求Servlet，在某个Servlet里这样写:

package com.yxq.servlet;

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

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

import com.yxq.dao.ArticalDao;
import com.yxq.dao.ArticaltypeDao;
import com.yxq.dao.UserDao;
import com.yxq.toolsbean.Mytools;
import com.yxq.valuebean.Model_Artical;
import com.yxq.valuebean.Model_ArticalType;

public class ArticleServlet extends HttpServlet {
    public ArticleServlet() {
        super();
    }
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request,response);
        
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String action = request.getParameter("action");
        if(action ==null){
            action ="";
        }
        if(action.equals("read")){
            System.out.println("方法");
            this.readArticle(request, response);
        }
        if(action.equals("add")){
            this.addArticle(request, response);
        }
        if(action.equals("delete")){
            this.deleteArticle(request, response);
        }
        if(action.equals("modify")){
            this.modifyArticle(request, response);
        }
        
    }
    public void init() throws ServletException {
        
    }
    public void readArticle(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{
        HttpSession session = request.getSession();
        String strId = request.getParameter("id");
        int id  =Mytools.strToint(strId);
        System.out.println(id);
        ArticalDao articaldao = new ArticalDao();
        Model_Artical artical = null;
        UserDao userid = new UserDao();
        try {
            artical= articaldao.queryArticleSingle(id);
            Integer userid1 = artical.getUser_Id();
            String authorname = userid.getusername(userid1);
            request.setAttribute("authorname",authorname);
            session.setAttribute("artical",artical);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        RequestDispatcher rd = request.getRequestDispatcher("/front/ArticleSingle.jsp");
        rd.forward(request, response);
        
    }
    public void addArticle(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{
        request.setCharacterEncoding("utf-8");
        ArticalDao articledao = new ArticalDao();
        Model_Artical article =new Model_Artical();
        String articlecontent , articletitle;
        try{
            articlecontent= request.getParameter("articlecontent");
            articletitle = request.getParameter("articletitle");
            article.setArtical_Content(articlecontent);
            article.setArtical_Glancenumber(0);
            article.setArtical_Name(articletitle);
            article.setArticalTypel_Id(1);
            article.setUser_Id(1);
            article.setArtical_Date(new Date());
            articledao.operattionArtical("add", article);        
            
        }catch(Exception e){
            e.printStackTrace();
            System.out.println("获取表单信息出错");
            
        }
        response.sendRedirect(request.getContextPath()+"/admin/MyJsp.jsp");
    }
    /*删除文章*/
    public void deleteArticle(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{
        String strId = request.getParameter("id");
        int id  =Mytools.strToint(strId);
        System.out.println("删除文章的id"+id);
        System.out.print("删除文章");
        ArticalDao articaldao = new ArticalDao();
        try {
            articaldao.deleteartical(id);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            System.out.println("删除文章出错");
            e.printStackTrace();
        }
        response.sendRedirect(request.getContextPath()+"/admin/admin.jsp");
    }
    /*修改文章*/
    public void modifyArticle(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{
        String strId = request.getParameter("id");
        int id  =Mytools.strToint(strId);
        System.out.println("修改文章的id"+id);
        System.out.print("修改文章");
        ArticalDao articaldao = new ArticalDao();
        Model_Artical artical = null;
        ArticaltypeDao articaltypedao = new ArticaltypeDao();
        try {
            artical= articaldao.queryArticleSingle(id);    
            request.setAttribute("artical",artical);
            request.setAttribute("articalid",id);
            List<Model_ArticalType> articaltype = articaltypedao.query();
            request.setAttribute("articletypelist",articaltype);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        RequestDispatcher rd = request.getRequestDispatcher("/admin/modifySingle.jsp");
        rd.forward(request, response);
        
        
    }
}

 剩下的模型层要根据自己的实际情况写。