使用基本MVC2模式创建新闻网站
基本的操作就是连接数据库的进行简单的增删改查，然后数据的回显。此处遇到的主要的问题一个是使用ueditor富文本编辑的时候，需要配置。
其次最需要注意的就是数据库的操作语句以及数据库的连接，新闻表的代码，由于之前已经做过登录，不在附上该操作代码。在操作数据库时，如果频繁的需要连接数据库，那么可以将连接的代码单独写到一个类中去。
1 package dao;
2
3 import java.sql.Connection;
4 import java.sql.DriverManager;
5 import java.sql.PreparedStatement;
6 import java.sql.ResultSet;
7 import java.sql.SQLException;
8 import java.sql.Statement;
9 import java.util.ArrayList;
10 import java.util.List;
11
12 import bean.News;
13
14 public class Newsdao {
15 private static final long serialVersionUID = 1L;
16 // private String driverName="com.mysql.jdbc.Driver";
17 // private String url="jdbc:mysql://localhost:3306/newsdata?useSSL=false&serverTimezone=UTC";
18 // private String name="root";
19 // private String pwd="123456";
20 static Connection con=null;
21 public static Connection getCon() {
22 String driverName="com.mysql.cj.jdbc.Driver";
23 String url="jdbc:mysql://localhost:3306/newsdata?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true";
24 String name="root";
25 String pwd="123456";
26 try {
27 Class.forName(driverName);
28 try {
29 con = DriverManager.getConnection(url, name, pwd);
30 } catch (SQLException e) {
31 e.printStackTrace();
32 }
33
34 } catch (ClassNotFoundException e) {
35 e.printStackTrace();
36 }
37 return con;
38 }
39 //添加新闻
40 public boolean addNews(News news) {
41 con=Newsdao.getCon();
42 boolean flag=false;
43 String sql="insert news(title,type,datetime,content) values('"+news.getTitle()+"','"
44 +news.getType()+"','"
45 +news.getDateTime()+"','"
46 +news.getContent()+"')";
47 //System.out.println("添加的sql语句"+sql);
48 try {
49 PreparedStatement ps=con.prepareStatement(sql);
50 int i=ps.executeUpdate();
51 //System.out.println("i的值"+i);
52 ps.close();
53 con.close();
54 if(i>0) {
55 flag =true;
56 }
57 } catch (SQLException e) {
58 System.out.println("添加出错啦");
59 e.printStackTrace();
60 }
61
62 return flag;
63 }
64 public List<News> selectByID(int id){
65 con=Newsdao.getCon();
66 List<News> list=new ArrayList<>();
67 String sql="select * from news where id="+id+"";
68 System.out.println(sql);
69 Statement state;
70 ResultSet rs;
71 try {
72 state = con.createStatement();
73 rs=state.executeQuery(sql);
74 while(rs.next()) {
75 News news=new News();
76 news.setTitle(rs.getString("title"));
77 news.setContent(rs.getString("content"));
78 news.setDateTime(rs.getString("dateTime"));
79 news.setType(rs.getString("type"));
80 ; news.setId(id);
81 list.add(news);
82 //System.out.println(news.getTitle());
83 }
84 rs.close();
85 state.close();
86 con.close();
87 } catch (SQLException e) {
88 System.out.println("查询出错啦");
89 e.printStackTrace();
90 }
91 return list;
92 }
93
94
95 //删除新闻
96 public List<News> selectAll(){
97 con=Newsdao.getCon();
98 List<News> list=new ArrayList<News>();
99 String sql="select * from news";
100 Statement state;
101 ResultSet rs;
102 try {
103 state = con.createStatement();
104 rs=state.executeQuery(sql);
105 while(rs.next()) {
106 News news=new News();
107 news.setId(rs.getInt("id"));
108 news.setTitle(rs.getString("title"));
109 news.setContent(rs.getString("content"));
110 news.setDateTime(rs.getString("dateTime"));
111 news.setType(rs.getString("type"));
112 list.add(news);
113 //System.out.println(news.getType());
114 }
115 rs.close();
116 state.close();
117 con.close();
118 } catch (SQLException e) {
119 System.out.println("查询出错啦");
120 e.printStackTrace();
121 }
122 return list;
123 }
124
125 //修改新闻
126
127 public boolean update(News news) {
128 con=Newsdao.getCon();
129 boolean flag=false;
130 String sql="update news set title='"+news.getTitle()+"',type='"+news.getType()
131 +"',dateTime='"+news.getDateTime()
132 +"',content='"+news.getContent()+"' where id="+news.getId()+"";
133 System.out.println(sql);
134 Statement state=null;
135 try {
136 state = con.createStatement();
137 int i=state.executeUpdate(sql);
138 System.out.println(i);
139 if(i>0) {
140 flag=true;
141 }
142 } catch (SQLException e) {
143 System.out.println("更新错误啦");
144 e.printStackTrace();
145 }
146
147 return false;
148 }
149
150 //删除
151 public boolean delete(int id) {
152 con=Newsdao.getCon();
153 boolean flag=false;
154 String sql="delete from news where id='"+id+"'";
155 // System.out.println(sql);
156 PreparedStatement ps;
157 try {
158 ps = con.prepareStatement(sql);
159 int i=ps.executeUpdate();
160 if(i>0){
161 flag=true;
162 }
163 } catch (SQLException e) {
164 System.out.println("删除出错啦");
165 e.printStackTrace();
166 }
167
168 return flag;
169 }
170
171 }
新闻的添加
package servlet; import java.io.IOException; 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 bean.News; import dao.Newsdao; /** * Servlet implementation class AddServlet */ @WebServlet("/AddServlet") public class AddServlet extends HttpServlet { public AddServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=UTF-8"); String title=request.getParameter("title"); String type=request.getParameter("type"); String datetime=request.getParameter("datetime"); String content=request.getParameter("ueditor"); System.out.println("这是ueditor的内容"+title+content); News news=new News(); news.setTitle(title); news.setContent(content); news.setDateTime(datetime); news.setType(type); Newsdao nd=new Newsdao(); try{ nd.addNews(news); response.sendRedirect("newslistServlet"); //request.getRequestDispatcher("/newslist.jsp").forward(request, response); }catch(Exception e) { System.out.println("添加失败"); } } }
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@page import="java.util.*" %> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html" charset="utf-8"> <script type="text/javascript" charset="utf-8" src="utf8-jsp/ueditor.config.js"></script> <script type="text/javascript" charset="utf-8" src="utf8-jsp/ueditor.all.min.js"> </script> <script type="text/javascript" charset="utf-8" src="utf8-jsp/lang/zh-cn/zh-cn.js"></script> <title>新闻页</title> <style type="text/css"> body{ margin-top:20px; backgroud-color:#ff2812; text-align:center; } .text{ width:500px; height:20px; } .btn{ right: 35px; bottom: 25px; width: 100px; height: 30px; background: #759fc7; font-size: 15px; color: #fff; letter-spacing: 10px; margin-left:40px; text-align: center; } </style> </head> <body> <div > <h2>添加新闻</h2> <form action="addServlet" method="POST" > 新闻标题 <input class="text" type="text" name="title" ><br><br> 新闻类别 <input type="radio" name="type" value="娱乐" checked="checked"/>娱乐 <input type="radio" name="type" value="体育"/>体育 <input type="radio" name="type" value="国际"/>国际 <input type="radio" name="type" value="社会"/>社会 <input type="radio" name="type" value="财经"/>财经 <input type="radio" name="type " value="科技"/>科技 <br><br> 发布时间 <input class="text" type="text" name="datetime" ><br><br> 正文编辑 <script id="editor" type="text/plain" name="ueditor" style="width:1024px;height:500px;margin-left:100px"></script> <button class="btn" type="submit">保存</button > <!-- <button class="btn" type="submit">退出</button> --> </form> </div> <script type="text/javascript"> var ue=UE.getEditor('editor'); function getPlainTxt() { var arr = []; arr.push("使用editor.getPlainTxt()方法可以获得编辑器的带格式的纯文本内容"); arr.push("内容为："); arr.push(UE.getEditor('editor').getPlainTxt()); alert(arr.join('\n')) } </script> </body> </html>
删除
package servlet; import java.io.IOException; 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 dao.Newsdao; /** * Servlet implementation class DeleteServlet */ @WebServlet("/DeleteServlet") public class DeleteServlet extends HttpServlet { private static final long serialVersionUID = 1L; public DeleteServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); String id=(String)request.getParameter("id"); System.out.println("被删除的新闻"); int nid=Integer.parseInt(id); Newsdao nd=new Newsdao(); nd.delete(nid); response.sendRedirect("newslistServlet"); //request.getRequestDispatcher("/newslist.jsp").forward(request, response); } }
修改
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@page import="java.util.*" %> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html" charset="utf-8"> <script type="text/javascript" charset="utf-8" src="utf8-jsp/ueditor.config.js"></script> <script type="text/javascript" charset="utf-8" src="utf8-jsp/ueditor.all.min.js"> </script> <script type="text/javascript" charset="utf-8" src="utf8-jsp/lang/zh-cn/zh-cn.js"></script> <title>新闻页</title> <style type="text/css"> body{ margin-top:20px; backgroud-color:#ff2812; text-align:center; } .text{ width:500px; height:20px; } .btn{ right: 35px; bottom: 25px; width: 100px; height: 30px; background: #759fc7; font-size: 15px; color: #fff; letter-spacing: 10px; margin-left:40px; text-align: center; } </style> </head> <body> <div > <h2>修改新闻</h2> <form action="updateServlet" method="GET" > <c:forEach var="s" items="${item}"> 新闻编号 <input class="text" type="text" name="id" value="${s.id }"><br><br> 新闻标题 <input class="text" type="text" name="title" value="${s.title }"><br><br> 新闻类别 <input type="radio" name="type" value="娱乐" ${("娱乐"eq s.type)?"checked":""}/>娱乐 <input type="radio" name="type" value="体育" ${("体育"eq s.type)?"checked":""}/>体育 <input type="radio" name="type" value="国际" ${("国际"eq s.type)?"checked":""}/>国际 <input type="radio" name="type" value="社会" ${("社会"eq s.type)?"checked":""}/>社会 <input type="radio" name="type" value="财经" ${("财经"eq s.type)?"checked":""}/>财经 <input type="radio" name="type" value="科技" ${("科技"eq s.type)?"checked":""}/>科技 <br><br> 发布时间 <input class="text" type="text" name="datetime" value="${s.dateTime }" ><br><br> 正文编辑 <script id="editor" type="text/plain" name="editor" style="width:1024px;height:500px;margin-left:100px">${s.content}</script> <button class="btn" type="submit">保存</button > <!-- <button class="btn" type="submit">退出</button> --> </form> </div> </c:forEach> <script type="text/javascript"> var ue=UE.getEditor('editor'); UE.getEditor('editor').setContent('${s.content}'); /* function setContent(isAppendTo) { var arr = []; arr.push("使用editor.setContent('欢迎使用ueditor')方法可以设置编辑器的内容"); ue.getEditor('editor').setContent('欢迎使用ueditor', isAppendTo); alert(arr.join("\n")); } */ //alter("gg"); //UE.getEditor('editor').setContent('${s.content}'); function getContent() { var arr = []; arr.push(UE.getEditor('editor').getContent()); alert(arr.join("\n")); } </script> </body> </html>
package servlet; import java.io.IOException; 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 bean.News; import dao.Newsdao; /** * Servlet implementation class UpnewsServlet */ @WebServlet("/UpdateServlet") public class UpdateServlet extends HttpServlet { private static final long serialVersionUID = 1L; public UpdateServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); request.setCharacterEncoding("utf-8"); String id=request.getParameter("id"); System.out.println("id的值为"+id); int nid=Integer.parseInt(id); String title=request.getParameter("title"); String type=request.getParameter("type"); String datetime=request.getParameter("datetime"); String content=request.getParameter("editor"); News news=new News(); news.setId(nid); news.setTitle(title); news.setContent(content); news.setDateTime(datetime); news.setType(type); Newsdao nd=new Newsdao(); try{ nd.update(news); response.sendRedirect("newslistServlet"); }catch(Exception e) { System.out.println("修改失败"); } } }
package servlet; import java.io.IOException; import java.util.List; 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 bean.News; import dao.Newsdao; /** * Servlet implementation class ShowServlet */ @WebServlet("/ShowServlet") public class ShowServlet extends HttpServlet { private static final long serialVersionUID = 1L; public ShowServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;cahrset=utf-8"); String id=request.getParameter("id"); int nid=Integer.parseInt(id); Newsdao nd=new Newsdao(); List<News> list=nd.selectByID(nid); request.setAttribute("item", list); System.out.println(list.size()); request.getRequestDispatcher("/update.jsp").forward(request, response); } }
查找
package servlet; import java.io.IOException; import java.util.List; 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 bean.News; import dao.Newsdao; @WebServlet("/SelectServlet") public class SelectServlet extends HttpServlet { private static final long serialVersionUID = 1L; public SelectServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;cahrset=utf-8"); String id=request.getParameter("id"); int nid=Integer.parseInt(id); Newsdao nd=new Newsdao(); List<News> list=nd.selectByID(nid); request.setAttribute("news", list); System.out.println(list.size()); request.getRequestDispatcher("/content.jsp").forward(request, response); } }
