java-ee项目结构设计
1.dao:对数据库的访问，实现了增删改查
2.entity:定义了新闻、评论、用户三个实体，并设置对应实体的属性
3.filter：过滤器，设置字符编码都为utf8，防止乱码出现
4.service:业务逻辑处理
5.servlet:处理页面请求
6.utils:工具类
7.c3p0-config.xml：JDBC配置
JavaWeb新闻管理系统（基础版）-腾讯云开发者社区-腾讯云
https://www.cnblogs.com/luomei/p/13124130.htmlJSP显示新闻
Java Jsp+mysql实现新闻发布管理系统（新闻管理、栏目/评论管理、）_jsp项目案例:新闻发布系统—主题管理及首页新闻显示-CSDN博客
NewsUpdateServlet.java
package comm.ch11_pra.servlet.news;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.text.SimpleDateFormat;
@WebServlet( value = "/newsUpdateServlet")
public class NewsUpdateServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("财院新闻");
Connection connection = null;
Statement st = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/ch11?characterEncoding=utf-8",
"root", "123456");
String update_id= request.getParameter("update_id");
String update_title = request.getParameter("update_title");
String update_author=request.getParameter("update_author");
String update_content=request.getParameter("update_content");
PreparedStatement ps=connection.prepareStatement("update news set title=?,author=?,content=? ,date=? where id=?");
ps.setString(1,update_title);
ps.setString(2,update_author);
ps.setString(3,update_content);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date1 = new Date(System.currentTimeMillis());
String currentTime = dateFormat.format(date1);
ps.setString(4,currentTime);
ps.setString(5,update_id);
ps.executeUpdate();
response.sendRedirect("newsServlet");
} catch (Exception e) {
throw new RuntimeException(e);
}finally {
// try {
// connection.close();
// st.close();
// rs.close();
// } catch (Exception e) {
// throw new RuntimeException(e);
// }
}
}
}
news.jsp
<%@ page import="comm.ch11_pra.entity.News" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="com.fasterxml.jackson.databind.ObjectMapper" %><%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2023/12/23
Time: 11:43
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<script>
function addModelShow(){
document.getElementsByName("add_title")[0].value="";
document.getElementsByName("add_author")[0].value="";
document.getElementsByName("add_content")[0].value="";
var addModel=document.getElementById("addModel");
addModel.style.display="block";
}
function addModelClose(){
var addModel=document.getElementById("addModel");
addModel.style.display="none";
}
function deleteNews(id){
if(confirm("确认删除id为"+id+"该条数据吗？")){
window.location.href="newsDeleteServlet?id="+id;
}
}
function updateModelShow(news_json){
document.getElementsByName("update_id")[0].value=news_json.id;
document.getElementsByName("update_title")[0].value=news_json.title;
document.getElementsByName("update_author")[0].value=news_json.author;
document.getElementsByName("update_content")[0].value=news_json.content;
var updateModel=document.getElementById("updateModel");
updateModel.style.display="block";
}
function updateModelClose(){
var updateModel=document.getElementById("updateModel");
updateModel.style.display="none";
}
</script>
<body>
<%
ArrayList<News> news_list = (ArrayList<News>) request.getAttribute("news_list");
%>
<form action="newsServlet">
标题：<input type="text" name="search_title">
作者：<input type="text" name="search_author">
内容：<input type="text" name="search_content">
<input type="submit" value="查询">
</form>
<input type="button" value="新增" onclick="addModelShow()">
<table border="1">
<tr><th>id</th><th>title</th><th>author</th><th>content</th><th>date</th></tr>
<%
if(news_list!=null){
for(News news : news_list){
out.print("<tr>");
out.print("<td>" + news.getId() + "</td>");
out.print("<td>" + news.getTitle() + "</td>");
out.print("<td>" + news.getAuthor() + "</td>");
out.print("<td>" + news.getContent() + "</td>");
out.print("<td>" + news.getDate() + "</td>");
ObjectMapper mapper = new ObjectMapper();
String news_json = mapper.writeValueAsString(news);
out.print("<td>" +
"<input type='button' value='删除' onclick='deleteNews("+news.getId()+")'>"+
"<input type='button' value='修改' onclick='updateModelShow("+news_json+")'>"+
"</td>");
out.print("</tr>");
}
}
%>
</table>
<div id="addModel" style="display: none;position: absolute;top: 40%;left: 45%;border: 2px dashed #f00;padding: 10px">
<div><span style="margin-left: 70px">新增新闻</span><div style="float: right" onclick="addModelClose()">X</div></div>
<form action="newsaddServlet">
标题：<input type="text" name="add_title"><br>
作者：<input type="text" name="add_author"><br>
内容：<input type="text" name="add_content"><br>
<input type="submit" value="确认">
</form>
</div>
<div id="updateModel" style="display: none;position: absolute;top: 40%;left: 45%;border: 2px dashed #f00;padding: 10px">
<div><span style="margin-left: 70px">修改新闻</span><div style="float: right" onclick="updateModelClose()">X</div></div>
<form action="newsUpdateServlet">
<input type="text" name="update_id" style="display: none">
标题：<input type="text" name="update_title"><br>
作者：<input type="text" name="update_author"><br>
内容：<input type="text" name="update_content"><br>
<input type="submit" value="确认">
</form>
</div>
</body>
</html>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>comm</groupId>
<artifactId>ch11_pra</artifactId>
<version>1.0-SNAPSHOT</version>
<name>ch11_pra</name>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<junit.version>5.9.1</junit.version>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.15.1</version>
</dependency>
</dependencies>
</project>
