新闻发布系统

一.实现效果图：

主页面：

登陆后跳转的页面：

添加新闻=====文件上传：

编辑新闻----修改  删除：

添加主题===分类：

编辑主题：

二.分层架构图：

web项目里后台的分层：

三.如下就是功能的实现代码：

登陆的主要代码：

package cn.news.dao.impl;

import java.sql.SQLException;

import org.junit.Test;

import cn.news.dao.BaseDAO;
import cn.news.dao.IUserInfoDAO;
import cn.news.entity.UserInfo;

public class UserInfoDAOImpl extends BaseDAO implements IUserInfoDAO {

    @Test
    public void loginTest() throws SQLException{
        UserInfo info =new UserInfo();
        info.setUname("admin");
        info.setUpwd("admin");
         boolean flag= isLogin(info);
         if (flag) {
            System.out.println("login success!");
        }
    }
    
    
    public boolean isLogin(UserInfo info) throws SQLException {
        boolean flag=false;
        
        String sql="select count(1) as mycount from useerinfo where uname=? and upwd=?";
        Object[] paras={info.getUname(),info.getUpwd()};
        getConection();
        rs=executeQuery(sql,paras);
        if (rs.next()) {
            int count = rs.getInt("mycount");
            if (count>0) {
                //登录成功
                flag=true;
            }
        }
        closeResources();
        return flag;
    }

}

获取新闻内容代码：

package cn.news.serlvet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.List;

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

import cn.news.entity.NewsInfo;
import cn.news.entity.UserInfo;
import cn.news.service.INewsInfoService;
import cn.news.service.IUserInfoService;
import cn.news.service.impl.NewsInfoServiceImpl;
import cn.news.service.impl.UserInfoServiceImpl;

public class UserInfoServlet extends HttpServlet {

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

    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //准备新闻数据
        INewsInfoService newsservice=new NewsInfoServiceImpl();
        try {
            List<NewsInfo> newsList = newsservice.getAllNews();
            //放入request作用域
            request.setAttribute("newsList", newsList);
        } catch (SQLException e1) {
            
        }
        
        
        String action=request.getParameter("action");  //logout
        if ("logout".equals(action)) {
            //执行注销操作
            
            //1.清除session
            request.getSession().removeAttribute("uname");
            //2.跳转到index
            /*response.sendRedirect("/NewsManagerSystem/index.jsp");*/
            
            request.getRequestDispatcher("/index.jsp").forward(request, response);
            
        }else if("login".equals(action)) {
            //code write here
            //1.解决乱码
            request.setCharacterEncoding("utf-8");
            //2.解析前台传递的表单数据 
            String uname=request.getParameter("uname");
            String upwd=request.getParameter("upwd");
            
            //拼接成一个用户对象
            UserInfo info=new UserInfo();
            info.setUname(uname);
            info.setUpwd(upwd);
            
            IUserInfoService service=new UserInfoServiceImpl();
                    
            try {
                boolean flag = service.isLogin(info);
                
                if (flag) {  //登录成功

                    //3.记录session
                    request.getSession().setAttribute("uname", uname);
                    //4.转发或者重定向   转发不需要加项目名称
                    request.getRequestDispatcher("/newspages/admin.jsp").forward(request, response);
                    
                }else {
                    //response.sendRedirect("/NewsManagerSystem/index.jsp");
                    request.getRequestDispatcher("/index.jsp").forward(request, response);
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }//code write here
            
        }else {
            //第一次访问首页
            request.getRequestDispatcher("/index.jsp").forward(request, response);
        }
        
        
    }

页面调用：

<script type="text/javascript">
    
<%if("true".equals(request.getAttribute("longinfailure"))){%>
    alert("用户名或密码为空！");
<%}%>
    
</script>

</head>

<body>
    <div id="header">
        <div id="top_login">
            <form action="<%=path%>/UserInfoNewServlet" method="post">
                <label> 登录名 </label> <input type="text" id="uname" name="uname"
                    value="" class="login_input" /> <label> 密&#160;&#160;码 </label> <input
                    type="password" id="upwd" name="upwd" value="" class="login_input" />
                <input type="submit" class="login_sub" value="登录" />

分页：

package cn.news.util;

import java.util.List;

import cn.news.entity.NewsInfo;

public class Page {
    // 当前页
    private int pageIndex;
    // 页面总记录数
    private int pageSize;
    // 本业显示真实数据
    private List<NewsInfo> list;
    // 总页数
    private int totalPages;
    // 总记录数
    private int totalRecords;

    public int getPageIndex() {
        return pageIndex;
    }

    public void setPageIndex(int pageIndex) {
        this.pageIndex = pageIndex;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List<NewsInfo> getList() {
        return list;
    }

    public void setList(List<NewsInfo> list) {
        this.list = list;
    }

    public int getTotalPages() {
        return totalPages;
    }

    public void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
    }

    public int getTotalRecords() {
        return totalRecords;
    }

    public void setTotalRecords(int totalRecords) {
        this.totalRecords = totalRecords;
    }

}

从数据库里拿到的分页代码如下：

@Override
    public List<NewsInfo> getPageInfos(int pageIndex, int pageSize) throws Exception {
        List<NewsInfo> list=new ArrayList<NewsInfo>();

        String sql="SELECT * FROM newinfo LIMIT ?,?";
        rs=executeQuery(sql,(pageIndex-1)*pageSize,pageSize);
        if (rs!=null) {
            while (rs.next()) {
                NewsInfo info=new NewsInfo();
                int nid=rs.getInt("nid");
                String ntitle=rs.getString("ntitle");
                String nauthor=rs.getString("nauthor");
                Date npublisherdate=rs.getDate("npublisherdate");
                String ncontent=rs.getString("ncontent");
                int tid=rs.getInt("tid");
                
                info.setNauthor(nauthor);
                info.setNcontent(ncontent);
                info.setNid(nid);
                info.setNpublisherdate(npublisherdate);
                info.setNtitle(ntitle);
                info.setTid(tid);
                
                list.add(info);
            }
        }
        return list;
    }

servlet调用：

public void pagenews(HttpServletRequest request,HttpServletResponse response) {
        IUserInfoService daoInfoService = new UserInfoService();
        try {
            Page oaPage = new Page();
            // 默认三条数据
            int pageSize = 3;
            oaPage.setPageSize(pageSize);
            // pageIndex(当前页)
            int myindex = 1;
            
            String pageIndex = request.getParameter("pageIndex");
            if (null!=pageIndex && (!pageIndex.equals(""))) {
                myindex = Integer.parseInt(pageIndex);
            }
            
            // 总页数赋值=总记录数/pageSize
            int mytotalPages = 0;
            int ipages = daoInfoService.selectnewsall();
            if (ipages % pageSize == 0) {
                mytotalPages = ipages / pageSize;
            } else {
                mytotalPages = ipages / pageSize + 1;
            }
            oaPage.setTotalPages(mytotalPages);
            if(myindex>oaPage.getTotalPages()){
                myindex=oaPage.getTotalPages();    
                System.out.println(myindex+"1");
            }
            System.out.println("=================================");
            if (myindex<1) {
                myindex=1;
                System.out.println(myindex+"2");
            }
            oaPage.setPageIndex(myindex);
            // 泛型数据赋值
            List<NewsInfo> list = daoInfoService.getPageInfos(oaPage.getPageIndex(), pageSize);
            oaPage.setList(list);

            // 将泛型集合，放入request作用域
            request.setAttribute("list", oaPage);
            // 转发index.jsp 转发不用加名称
            

        } catch (Exception e) {

            e.printStackTrace();
        }
    }
    public void pageNews(HttpServletRequest request,HttpServletResponse response) {
        IUserInfoService daoInfoService = new UserInfoService();
        try {
            Page oaPage = new Page();
            // 默认三条数据
            int pageSize = 3;
            oaPage.setPageSize(pageSize);
            // pageIndex(当前页)
            int myindex = 1;
            
            String pageIndex = request.getParameter("pageIndex");
            if (null!=pageIndex && (!pageIndex.equals(""))) {
                myindex = Integer.parseInt(pageIndex);
            }
            
            // 给当前页赋值
            
            // 总页数赋值=总记录数/pageSize
            int mytotalPages = 0;
            int ipages = daoInfoService.selectnewsall();
            if (ipages % pageSize == 0) {
                mytotalPages = ipages / pageSize;
            } else {
                mytotalPages = ipages / pageSize + 1;
            }
            oaPage.setTotalPages(mytotalPages);
            if(myindex>oaPage.getTotalPages()){
                myindex=oaPage.getTotalPages();    
                System.out.println(myindex+"1");
            }
        
            if (myindex<1) {
                myindex=1;
                System.out.println(myindex+"2");
            }
            oaPage.setPageIndex(myindex);
            // 泛型数据赋值
            List<NewsInfo> list = daoInfoService.getPageInfos(oaPage.getPageIndex(), pageSize);
            oaPage.setList(list);

            // 将泛型集合，放入request作用域
            request.setAttribute("list", oaPage);
            // 转发index.jsp 转发不用加名称
            
            } catch (Exception e) {
            e.printStackTrace();
            }
    }

显示的页数：

<p align="right"> 当前页数:[${list.pageIndex}/${list.totalPages}]&nbsp;
          <a href="${pageContext.request.contextPath}/NewsServlet?pageIndex=${list.pageIndex-1}">上一页</a>&nbsp; 
           <a href="${pageContext.request.contextPath}/NewsServlet?pageIndex=${list.pageIndex+1}">下一页</a>&nbsp; 
           <a href="${pageContext.request.contextPath}/NewsServlet?pageIndex=${list.totalPages}">末页</a> </p>

本期就到这里，等待下期继续——————————————————