JavaWeb-06 (项目案例3)
javaWeb-06 (项目案例3)
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一.项目模糊查询
<!-- 功能1：实现模糊查询的搜索功能（根据标题进行模糊查询） -->
<div style = "width:100%;height:40px;text-align: center;line-height:40px; ">
<form action = "admin.jsp" method = "post">
<label>新闻标题</label>
<input type = "text" name = "strName" autocomplete="off"/>
<input type = "submit" value = "搜索"/>
</form>
</div>
<%
//编码设置
request.setCharacterEncoding("utf-8");
String strName = request.getParameter("strName");
//sql语句
String sql = "select * from tb_news";
if(strName != null){
//将指定编码的字符串进行解码 通过getBytes("编码") 构造函数new String()编码
strName = new String(strName.getBytes("ISO-8859-1"),"utf-8");
//sql语句拼接模糊查询
sql+=" where ntitle like '%"+strName+"%'";
}
System.out.println("模糊查询的关键词为:[sql] "+sql);
%>二.绑定index页面的主题和新闻
<!-- index.jsp用户首页的新闻分类显示（数据绑定） -->
<ul class="class_date">
<li id='class_month'>
<a href = "index.jsp"><b> 全部 </b></a>
<%
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//建立连接
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
Connection conn = DriverManager.getConnection(url, "scott", "123");
//sql
String sql = "select * from tb_news_theme";
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
//sql select count(*) from tb_news_theme
int count = 1;
while(rs.next()){
count++;
out.println("<a href='index.jsp?username="+username+"&ntid="+rs.getInt(1)+"'><b> "+rs.getString(2)+" </b></a> ");
//11 就是总记录数
if(count%11==0){
out.println("<br/>");
}
}
%>
</li>
</ul>
<!-- 当进入index.jsp页面后，手动点击对应的主题名称 跳转到本页面 获取当前点击的主题名称 -->
<%
username = request.getParameter("username");
String tid = request.getParameter("ntid");
if(null!=tid){//说明点击了主题分类
//根据点击的主题分类进行查询 where 条件
sql = "select * from tb_news where ntid = "+Integer.valueOf(tid);
}else{//第一次进来，没有点击主题分类
sql = "select * from tb_news";//查询所有新闻
}
%>三.绑定评论,删除评论
<div class="content">
<!-- 该区域实现新闻详情显示 start -->
<%
//定义所谓变量（新闻标题，发布时间，点击量，新闻内容等等）
String ntitle = "";//标题
String ndate = "";//发布时间
String nauthor = "";//作者
String ncontent = "";//内容
int ncount = 0;//点击量
//2.获取id
String id = request.getParameter("nid");
//转换
int nid = 0;
if(null!=id){
nid = Integer.valueOf(id);
}
//3.获取数据
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//建立连接
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "scott","123");
//sql语句
String sql = "select * from tb_news where nid = ?";
//将sql语句传入方法返回执行对象
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, nid);
//返回结果集对象
ResultSet rs = ps.executeQuery();
//if改造
if(rs.next()){
ntitle = rs.getString(3);
ndate = rs.getString(8);
nauthor = rs.getString(4);
ncontent = rs.getString(6);
ncount = rs.getInt(9);
}
%>
<ul class="classlist">
<table width="80%" align="center">
<tr width="100%">
<td colspan="2" align="center"><%=ntitle %>
点击量 <%=ncount %></td>
</tr>
<tr>
<td colspan="2">
<hr />
</td>
</tr>
<tr>
<td align="center"><%=ndate %></td>
<td align="left"><%=nauthor %> </td>
</tr>
<tr>
<td colspan="2" align="center"></td>
</tr>
<tr>
<td colspan="2"> <%=ncontent %> </td>
</tr>
<tr>
<td colspan="2">
<hr />
</td>
</tr>
</table>
</ul>
<ul class="classlist">
<table width="80%" align="center">
<!-- 从index.jsp页面中跳转到详情页面，如果有评论 此处要显示出来，如果没有
评论 显示 "暂无评论"
-->
<%
//定义一个变量存储指定新闻的评论数
int commentCount = 0;
//1.求指定新闻的评论数判断
sql ="select count(*) from tb_comment where cnid = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, nid);
rs = ps.executeQuery();
if(rs.next()){
commentCount = rs.getInt(1);
}
if(commentCount!=0){
//遍历所有的评论
sql ="select * from tb_comment where cnid = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, nid);
rs = ps.executeQuery();
while(rs.next()){
sql = "select * from tb_news_users where userid = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, rs.getInt(2));
ResultSet rs2 = ps.executeQuery();
String uname = "";
if(rs2.next()){
uname = rs2.getString(2);
}
out.println("<tr>");
out.println("<td>");
out.println("用户名:"+uname+"<br/>");
out.println("评论内容:"+rs.getString(5));
out.println(" <a href = 'doDelComment.jsp?username="+username+"&cid="+rs.getInt(1)+"'>删除</a><br/>");
out.println("评论时间:"+rs.getString(6)+"<br/>");
out.println("</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>");
out.println(" ");
out.println("</td>");
out.println("</tr>");
}
}else{
out.println("<td colspan='6'> 暂无评论！ </td>");
}
%>
<tr>
<td colspan="6">
<hr />
</td>
</tr>
</table>
</ul>
<ul class="classlist">
<form action="doComment.jsp" method="post" onsubmit="return check()">
<!-- 通过隐藏域标签传递新闻编号 -->
<input type = "hidden" name = "nid" value = "<%=nid %>"/>
<table width="80%" align="center">
<tr>
<td> 评 论 </td>
</tr>
<tr>
<td> 用户名： </td>
<td><input id="cauthor" name="username" value="<%=username %>" />
IP：
<input name="cip" value="127.0.0.1" readonly="readonly" />
</td>
</tr>
<tr>
<td colspan="2"><textarea name="ccontent" cols="70" rows="10"></textarea>
</td>
</tr>
<td><input name="submit" value="发 表" type="submit" />
</td>
</table>
</form>
</ul>
</div>
</div>
</div>
//跳转的doComment.jsp页面
<%@page import="java.text.SimpleDateFormat"%>
<%@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"%>
<%
//1.设置编码
request.setCharacterEncoding("utf-8");
//获取数据
//评论编号
int cid = 0;//定义一个变量保存最终的id
//链接数据库查询到最大的id 最后+1
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//建立连接
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
Connection conn = DriverManager.getConnection(url, "scott", "123");
String sql = "select nvl(max(cid),0) from tb_comment";
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
if(rs.next()){
cid = rs.getInt(1)+1;
}
//out.println("cid = "+cid);
//用户编号
int cuserid = 0;
String username = request.getParameter("username");
//根据用户名查找到该用户的编号
sql = "select * from tb_news_users where username = ?";
ps = conn.prepareStatement(sql);
ps.setString(1,username);
rs = ps.executeQuery();
if(rs.next()){
cuserid = rs.getInt(1);
}
//新闻编号
int nid = Integer.valueOf(request.getParameter("nid"));
//ip地址
String cip = request.getParameter("cip");
//内容
String ccontent = request.getParameter("ccontent");
//时间
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String cdate = sdf.format(date);
//发表评论
sql = "insert into tb_comment values(?,?,?,?,?,to_date(?,'yyyy-mm-dd hh24:mi:ss'))";
ps = conn.prepareStatement(sql);
ps.setInt(1, cid);
ps.setInt(2, cuserid);
ps.setInt(3, nid);
ps.setString(4, cip);
ps.setString(5, ccontent);
ps.setString(6, cdate);
int n = ps.executeUpdate();
if(n>0){
out.println("<script>alert('评论成功');location.href='newRead.jsp?username="+username+"&nid="+nid+"'</script>");
}else{
out.println("<script>alert('评论失败');location.href='newRead.jsp?username="+username+"&nid="+nid+"'</script>");
}
%>
//删除评论
<%
//删除评论
//设置编码
request.setCharacterEncoding("utf-8");
//获取用户名
String username = request.getParameter("username");
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//建立连接
String url = "jdbc:oracle:thin:@localhost:1521:orcl";
Connection conn = DriverManager.getConnection(url, "scott", "123");
int cuserid = 0;
String sql = "select * from tb_news_users where username = ?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, username);
ResultSet rs = ps.executeQuery();
if(rs.next()){
cuserid = rs.getInt(1);
}
//获取cid
String id = request.getParameter("cid");
int cid = 0;
if(null!=id){
cid = Integer.valueOf(id);
}
int cid_cuserid = 0;
//根据cid进行查找 cuserid
int nid = 0;//保存新闻编号
//sql
sql = "select * from tb_comment where cid = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, cid);
rs = ps.executeQuery();
if(rs.next()){
cid_cuserid = rs.getInt(2);
nid = rs.getInt(3);
}
if(cuserid!=cid_cuserid){//不是当前登录用户所评论的内容
//out.println("不是当前登录用户的评论内容");
out.println("<script>alert('此评论不是当前用户所评，无法删除');location.href='newRead.jsp?username="+username+"&nid="+nid+"'</script>");
}else{
//out.println("是当前登录用户的评论内容");
//根据当前登录的用户以及对应的评论编号进行删除
sql = "delete from tb_comment where cuserid = ? and cid = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, cid_cuserid);
ps.setInt(2, cid);
int n = ps.executeUpdate();
if(n>0){
out.println("<script>alert('删除成功');location.href='newRead.jsp?username="+username+"&nid="+nid+"'</script>");
}else{
out.println("<script>alert('删除失败');location.href='newRead.jsp?username="+username+"&nid="+nid+"'</script>");
}
}
%>
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