JavaWeb——新闻管理系统(Jsp+Servlet)之jsp新闻查询

2024-01-07 17:54:55

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 {
    @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");
            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: 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>
<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>

文章来源:https://blog.csdn.net/qq_73735007/article/details/135421942
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