public class DataStorage { public void save(List<News> newsList) throws Exception { String sql = "insert into news(title, url, content) values (?, ?, ?)"; Connection connectionDriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password"); PreparedStatement statement = connection.prepareStatement(sql); for (News news : newsList) { statement.setString(1, news.getTitle()); statement.setString(2, news.getUrl()); statement.setString(3, news.getContent()); statement.executeUpdate(); } statement.close(); connection.close();}这段代码什么意思
时间: 2024-02-14 08:20:49 浏览: 26
这是一个 Java 类,名为 DataStorage。其中有一个方法名为 save,该方法接收一个 News 类型的 List,将其保存到 MySQL 数据库中。具体来说,该方法使用 JDBC 连接数据库,通过 PreparedStatement 执行 INSERT SQL 语句,将每个 News 对象的 title、url 和 content 属性插入到名为 news 的表中。最后关闭 PreparedStatement 和 Connection 对象,释放资源。需要注意的是,在执行该方法之前,需要先导入 JDBC 驱动,并将数据库的 URL、用户名和密码传递给 DriverManager.getConnection() 方法。
相关问题
import threading from flask import Flask, render_template, request from crawl.paqu import MultiThreadHotDataSpider, MultiThreadSpecialDataSpider,HKConnectSpider,DataStorage app = Flask(__name__) hot_data = [] special_data = [] hkconnect_data = [] @app.route('/') def index(): return render_template('index.html') @app.route('/hot') def hot(): return render_template('hot.html', hot_data=hot_data) @app.route('/special') def special(): return render_template('special.html', special_data=special_data) @app.route('/hkconnect') def hkconnect(): return render_template('hkconnect.html', hkconnect_data=hkconnect_data) @app.route('/start_spider') def start_spider(): def spider(): global hot_data, special_data, hkconnect_data hot_spider = MultiThreadHotDataSpider() hot_data = hot_spider.get_data() special_spider = MultiThreadSpecialDataSpider() special_data = special_spider.get_data() hkconnect_spider = HKConnectSpider() hkconnect_data = hkconnect_spider.parse(hkconnect_spider.start_urls[0]) data_storage = DataStorage() data_storage.insert_hot_data(hot_data) data_storage.insert_special_data(special_data) data_storage.insert_hkconnect_data(hkconnect_data) t = threading.Thread(target=spider) t.start() return '爬虫已经开始' if __name__ == '__main__': app.run(host="0.0.0.0",debug=True)写出以上代码的前端html实现代码
由于没有给出index.html、hot.html、special.html和hkconnect.html的具体内容,我无法直接提供完整的实现代码。但是可以给你一个参考的思路:
在index.html中添加一个按钮,点击可以触发start_spider路由的访问。例如:
```html
<!DOCTYPE html>
<html>
<head>
<title>爬虫数据展示</title>
</head>
<body>
<h1>爬虫数据展示</h1>
<p>点击下面的按钮开始爬虫</p>
<button onclick="startSpider()">开始爬虫</button>
</body>
<script>
function startSpider() {
var xhr = new XMLHttpRequest();
xhr.open('GET', '/start_spider');
xhr.send();
alert('爬虫已经开始');
}
</script>
</html>
```
在hot.html、special.html和hkconnect.html中分别展示对应的数据。例如:
```html
<!DOCTYPE html>
<html>
<head>
<title>热门数据展示</title>
</head>
<body>
<h1>热门数据展示</h1>
<table>
<thead>
<tr>
<th>标题</th>
<th>链接</th>
<th>阅读量</th>
</tr>
</thead>
<tbody>
{% for item in hot_data %}
<tr>
<td>{{ item.title }}</td>
<td>{{ item.link }}</td>
<td>{{ item.read_count }}</td>
</tr>
{% endfor %}
</tbody>
</table>
</body>
</html>
```
其他两个页面的HTML代码类似,只需要将数据展示的表头和tbody里面的数据项替换成对应的数据即可。
DataStorage
Data storage refers to the process of storing digital data on electronic or physical storage media for future use. This can include hard drives, solid-state drives, cloud storage, magnetic tapes, and optical disks. Data storage is essential for businesses, organizations, and individuals to keep important information safe and easily accessible. It can also be used for backup and disaster recovery purposes. With the increasing amount of data being generated every day, data storage solutions are constantly evolving to meet the demand for secure and scalable storage options.
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