上一期给大家分享了关于系统的增删改查功能，今天就来接着给大家介绍新闻系统的评论及其他功能。
目录
一，阅读量的制作
当新闻被点击的时候，小眼睛图标（阅读量）就会进行相应的增加。
效果图：
代码块：
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.PreparedStatement" %>
<%@ page import="java.sql.ResultSet" %>
<%@ page import="java.sql.Connection" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<head>
<!-- read读取新闻内容的界面具有新闻修改，删除按钮 -->
<meta charset="UTF-8">
<title>bootstrap</title>
<meta content="width=device-width, initial-scale=1" name="viewport">
<link href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css" rel="stylesheet">
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<style>
* {
outline: none !important;
}
body,
html {
background: #7f8d90;
}
nav,
.breadcrumb {
border-radius: 0 !important;
margin-bottom: 0 !important;
}
.breadcrumb {
margin-bottom: 20px !important;
background: #36485c;
color: white;
}
input,
select,
textarea,
.panel-heading {
border: none !important;
border-radius: 0 !important;
}
.breadcrumb .active {
color: yellow;
}
</style>
</head>
<body>
<nav class="navbar navbar-default hidden-sm hidden-xs">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="${pageContext.request.contextPath}/index.jsp"
style="font-size: 25px;">🐖</a>
</div>
<ul class="nav navbar-nav">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown">
新闻管理
<span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li><a href="#">新闻发布</a></li>
<li class="divider"></li>
<li><a href="#">类别管理</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a>245@qq.com</a></li>
<li><a href="#">退出<span class="glyphicon glyphicon-off"></span></a></li>
</ul>
</div>
</nav>
<ol class="breadcrumb">
<li>您当前的位置是</li>
<li>新闻发布系统</li>
<li class="active">新闻阅读</li>
</ol>
<%
//获得新闻的id,根据id去数据库做查询操作
String newId = request.getParameter("newId");
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//定义连接字符串
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
//获得连接
Connection con = DriverManager.getConnection(url, "scott", "tiger");
//查询所有的新闻数据
PreparedStatement ps = con.prepareStatement("select * from t_news where news_id=?");
//占位符的设置(页面上的值都是String类型)
ps.setInt(1,Integer.parseInt(newId));
//得到结果集
ResultSet rs = ps.executeQuery();
//定义需要的值
String title="";
int count=0;
String author="";
String publisher="";
String content="";
int click=0;
//使用迭代器进行数据查询
if(rs.next()){
//可以取值
title=rs.getString(2);
publisher=rs.getString(5);
author=rs.getString(4);
content=rs.getString(8);
click=rs.getInt(6)+1;//加载这个页时就阅读了一次了
}
//到这里新闻内容就已经被用户阅读了
//将数据库里面的点击量+1
ps=con.prepareStatement("update t2_news set news_click=news_click+1 where news_id=?");
ps.setInt(1,Integer.parseInt(newId));
//执行修改
ps.executeUpdate();//修改不需要判断是否修改成功，直接反应在页面上
%>
<div class="container" style="background: rgba(239, 231, 231, 0.9);border-radius:10px;">
<h1><%=title%></h1>
<h3 class="text-right">
<small>
<span class="glyphicon glyphicon-user"><span class="label label-default"><%=author%></span></span>
<span class="glyphicon glyphicon-eye-open"><span class="label label-default"><%=click%></span></span>
<span class="glyphicon glyphicon-time"><span class="label label-info"><%=publisher%></span></span>
</small>
</h3>
<samp><%=content%></samp>
<div class="btn-group btn-group-justified" style="margin-bottom: 20px;">
<div class="btn-group">
<!-- newId是index传过来的！ -->
<!--删除按钮不能直接在read界面写删除操作是代码是因为这上面的代码会随着页面的每一次加载而运行，会每次一加载界面就删除，所以要写doDel后台-->
<a href="${pageContext.request.contextPath}/doDel.jsp?newId=<%=newId%>" class="btn btn-danger" type="button">删除</a>
</div>
<div class="btn-group">
<!--将newId也传给修改界面upd-->
<a href="${pageContext.request.contextPath}/upd.jsp?newId=<%=newId%>" class="btn btn-info" type="button">修改</a>
</div>
</div>
</div>
<div class="container" style="background: rgba(239, 231, 231, 0.9);border-radius:10px;margin-top: 10px;">
<div class="panel panel-default" style="margin-top: 20px;">
<!-- 循环在评论表中做查询显示-->
<%
ps=con.prepareStatement("select * from t2_comment where comment_from=?");
ps.setInt(1,Integer.parseInt(newId));
rs=ps.executeQuery();
while(rs.next()){
%>
<div class="panel-heading">
<span class="glyphicon glyphicon-user"><span class="label label-success"></span></span>
<p style="margin-top: 10px;text-indent: 2em;">
用户名<samp><%=rs.getString(4)%></samp>
</p>
<p>
<samp><%=rs.getString(5)%></samp>
</p>
<p class="text-right">
<span class="glyphicon glyphicon-time"><span class="label label-info"><%=rs.getString(3)%></span></span>
</p>
<p>
<a href="${pageContext.request.contextPath}/doDelPl.jsp?newId=<%=newId%>" class="btn btn-danger" type="button">删除</a>
</p>
</div>
<%
}
%>
</div>
</div>
<!-- 评论表的表单 -->
<!-- 点击按钮时(表单中的按钮默认为提交按钮)，会发出name属性值在路径上，
将一条评论插入数据库时要拿到这条评论的id-->
<form action="doAddPl.jsp" class="container" style="background: rgba(239, 231, 231, 0.9);border-radius:10px;margin-top: 10px;padding: 30px;">
<!--评论的id/id就是评论的来源-->
<input type="hidden" value=<%=newId %> name=newId>
<div class="form-group">
<label for="name">Name</label>
<input name="author" id="name" class="form-control" placeholder="用户名称" required type="text">
</div>
<div class="form-group">
<label for="email">content</label>
<input name="content" id="email" class="form-control" placeholder="评论内容" required type="text">
</div>
<button class="btn btn-default" type="submit">发布评论</button>
</form>
<div style="height: 50px;"></div>
</body>
</html>
二，新闻标题的模糊查询
用户可以在输入框中输入想查找的标题字眼，按搜索按钮就可以进行模糊查询，如果是空字符，则查询所有。
效果图：
代码：
<%@page import="java.nio.charset.StandardCharsets"%>
<%@page import="sun.nio.cs.UTF_8"%>
<%@page import="sun.nio.cs.UTF_8"%>
<%@page import="sun.nio.cs.UTF_8"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.Connection"%>
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>bootstrap</title>
<meta content="width=device-width, initial-scale=1" name="viewport">
<link href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css" rel="stylesheet">
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<style>
* {
outline: none !important;
}
body,
html {
background: #7f8d90;
}
nav,
.breadcrumb {
border-radius: 0px !important;
margin-bottom: 0px !important;
}
.breadcrumb {
margin-bottom: 20px !important;
background: #36485c;
color: white;
}
li h4 {
width: 300px;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
.breadcrumb .active {
color: yellow;
}
</style>
</head>
<body>
<nav class="navbar navbar-default hidden-sm hidden-xs">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="index.jsp" style="font-size: 25px;">⭐</a>
</div>
<ul class="nav navbar-nav">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown"> 新闻管理
<span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li><a href="/web04/news/add.jsp">新闻发布</a></li>
<li class="divider"></li>
<li><a href="/web04/news/show.jsp">类别管理</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a><%=request.getParameter("yh") %></a></li>
<li><a href="${pageContext.request.contextPath}/login.jsp">退出<span class="glyphicon glyphicon-off"></span></a></li>
</ul>
</div>
</nav>
<ol class="breadcrumb">
<li>您当前的位置是</li>
<li>新闻发布系统</li>
<li class="active">首页</li>
</ol>
<form action="${pageContext.request.contextPath}/news/index.jsp" class="form-inline" style="margin: 0px auto 20px;">
<div class="form-group" style="display: block;text-align: center;">
<div class="input-group">
<div class="input-group-addon">新闻标题</div>
<input name="newName" class="form-control" placeholder="请在此输入搜索的关键字" type="text">
<span class="input-group-btn">
<button class="btn btn-primary" type="submit">搜索🔍</button>
</span>
</div>
</div>
</form>
<div class="container">
<ul class="list-group">
<%
//点击了表单之后 跳转的是当前这个页面 同时携带一个newName（查询的关键字）过来
String newName=request.getParameter("newName");
if(newName==null){
newName="";//查询所有
}
//破碎重组
//newName=new String(newName.getBytes(StandardCharsets.ISO_8859_1),StandardCharsets.UTF_8);
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//定义连接字符串
String url="jdbc:oracle:thin:@localhost:1521:orcl";
//获得连接
Connection con=DriverManager.getConnection(url,"scott","123123");
//获得执行对象（查询所有的新闻数据）
PreparedStatement ps=con.prepareStatement("select * from t_news where news_title like ?");
ps.setString(1, "%"+newName+"%");
//得到结果集
ResultSet rs=ps.executeQuery();
//结果集中有很多数据
while(rs.next()){
%>
<li class="list-group-item">
<h4 class="list-group-item-heading">
<a href="${pageContext.request.contextPath}/news/read.jsp?newId=<%=rs.getInt(1) %>" data-placement="bottom" data-toggle="tooltip" href="" title="国家卫健委：昨日新增确诊病例29例，其中本土病例2例">
<%=rs.getString(2)%>>
</a>
</h4>
<p class="list-group-item-text text-right">
<span class="glyphicon glyphicon-user"><code><%=rs.getString(4) %></code></span>
<span class="glyphicon glyphicon-eye-open"><code><%=rs.getInt(8) %></code></span>
<span class="glyphicon glyphicon-tag"><code><%=rs.getInt(9)%></code></span>
<span class="glyphicon glyphicon-time"><code><%=rs.getString(5) %></code></span>
</p>
</li>
<%
}
if(con!=null&&!con.isClosed()){
con.close();
}
if(ps!=null){
ps.close();
}
if(rs!=null){
rs.close();
}
%>
</ul>
</div>
<div class="container text-center">
<ul class="pagination" style="margin: 20px auto;">
<li>
<a href="#"><span>«</span></a>
</li>
<li><a href="#">1</a></li>
<li><a href="#">2</a></li>
<li><a href="#">3</a></li>
<li><a href="#">4</a></li>
<li><a href="#">5</a></li>
<li>
<a href="#"><span>»</span></a>
</li>
</ul>
</div>
<script>
$(function () {
$('[data-toggle="tooltip"]').tooltip({
trigger: "hover"
})
})
</script>
</body>
</html>
三，新闻评论的新增，删除与显示
效果图：
代码：
<%@page import="java.util.Date"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("utf-8");
//接收评论的数据
String newId=request.getParameter("newId");
String author=request.getParameter("author");
String content=request.getParameter("content");
String publisher=new Date().toLocaleString();
//新闻的添加
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//定义连接字符串
String url="jdbc:oracle:thin:@localhost:1521:orcl";
//获得连接
Connection con=DriverManager.getConnection(url,"scott","tiger");
//主键不能不填
//主键没有自增的选项（触发器+序列）
//获得执行对象（数据插入之前先把id主键查询出来）
PreparedStatement ps=con.prepareStatement("select nvl(max(comment_id),0) from t_comment");
ResultSet rs=ps.executeQuery();
int id=0;
if(rs.next()){
id=rs.getInt(1)+1;
}
//插入评论的操作
ps=con.prepareStatement("insert into t_comment values(?,?,?,?,?)");
//赋值
ps.setInt(1,id);
ps.setInt(2,Integer.parseInt(newId));
ps.setString(3,publisher);
ps.setString(4,author);
ps.setString(5,content);
//执行结果
int n=ps.executeUpdate();
if(n>0){
//3号新闻进行评论添加
//返回3号新闻
out.print("<script>alert('增加成功');location.href='read.jsp?newId="+newId+"'</script>");
}else{
out.print("<script>alert('增加失败');history.go(-1)</script>");
}
if(con!=null&&!con.isClosed()){
con.close();
}
if(ps!=null){
ps.close();
}
%>
四，新闻主题的显示
效果图：
代码：
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
<script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
</head>
<!--新闻分类显示界面,读出数据库的内容显示-->
<body>
<nav class="navbar navbar-default hidden-sm hidden-xs">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" style="font-size: 25px;">当前是新闻首页</a>
</div>
<ul class="nav navbar-nav navbar-right" style="margin-right: 20px;">
<li><a href="#">返回管理员首页<span class="glyphicon glyphicon-road"></span></a></li>
</ul>
</div>
</nav>
<div class="container" style="margin: 10px auto;">
<div class="btn-group btn-group-justified">
<%
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//定义连接字符串
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
//获得连接
Connection con = DriverManager.getConnection(url, "scott", "tiger");
//查询所有的新闻数据
PreparedStatement ps = con.prepareStatement("select * from t_topic");
//得到结果集
ResultSet rs = ps.executeQuery();
//结果集中有很多数据
while (rs.next()) {
String topicId=request.getParameter("topicId");
if(topicId==null){
topicId="-1";
}
%>
<!-- active激活 -->
<!-- java代码会优先执行 -->
<a href="show.jsp?topicId=<%=rs.getInt(1) %>" <%=rs.getInt(1)==Integer.parseInt(topicId)? "active":"" %>
type="button" class="btn btn-success"><%=rs.getString(2)%></a>
<%
}
%>
</div>
</div>
<div class="container">
<ul class="list-group">
<%
String topicId=request.getParameter("topicId");
String sql="select * from t_news";//查询所有
//如果这个界面路径携带了 id就不为null
//如果这个界面路径没有携带 id就为null
if(topicId!=null){
//where前面要留一个空格，和上面的sql语句拼接！
sql+=" where news_topic="+topicId;//加上主题查询
}
ps=con.prepareStatement(sql);
rs=ps.executeQuery();
while(rs.next()){
%>
<li class="list-group-item">
<h4 class="list-group-item-heading">
<a href="" data-toggle="tooltip" data-placement="bottom" title="国家卫健委：昨日新增确诊病例29例，其中本土病例2例">
国家卫健委：昨日新增确诊病例29例，其中本土病例2例
</a>
</h4>
<p class="list-group-item-text text-right">
<span class="glyphicon glyphicon-user"><code><%=rs.getString(2) %></code></span>
<span class="glyphicon glyphicon-eye-open"><code><%=rs.getString(4) %></code></span>
<span class="glyphicon glyphicon-tag"><code><%=rs.getString(6) %></code></span>
<span class="glyphicon glyphicon-time"><code><%=rs.getString(5)%></code></span>
</p>
</li>
<%
}
%>
</ul>
</div>
</body>
</html>
今天的分享就到这里啦，精彩下期继续哦。
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