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JavaWeb——新闻管理系统(Jsp+Servlet)之jsp新闻查询

news 来源：原创 2024/5/20 2:18:41

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

NewsServlet.java

package comm.ch11_pra.servlet.news;import comm.ch11_pra.entity.News;import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;@WebServlet("/newsServlet")
public class NewsServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}@Overrideprotected 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");st = connection.createStatement();String search_title = request.getParameter("search_title");String search_author = request.getParameter("search_author");String search_content = request.getParameter("search_content");String sql ="select*from news where 1=1";
if(search_title!=null && !("".equals(search_title))){sql=sql+" and title like '%"+search_title+"%'";}
if(search_author!=null && !("".equals(search_author))){sql=sql+" and author like '%"+search_author+"%'";}
if(search_content!=null && !("".equals(search_content))){sql=sql+" and content like '%"+search_content+"%'";}System.out.println(sql);/*  String sql = "select * from news";*/rs = st.executeQuery(sql);ArrayList<News> news_list = new ArrayList<News>();while(rs.next()){News news = new News();news.setId(rs.getInt("id"));news.setTitle(rs.getString("title"));news.setAuthor(rs.getString("author"));news.setContent(rs.getString("content"));news.setDate(rs.getString("date"));news_list.add(news);}request.setAttribute("news_list", news_list);request.getRequestDispatcher("news.jsp").forward(request, response);} 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" %><%--Created by IntelliJ IDEA.User: AdministratorDate: 2023/12/23Time: 11:43To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<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><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>");out.print("</tr>");}}%>
</table>
</body>
</html>