为什么不使用爬虫框架？
原本使用的WebMagic框架，但是报了协议版本不一致异常，百度很多方法没解决掉，而且也是自己写着玩，就换了方式；
javax.net.ssl.SSLException: Received fatal alert: protocol_version
jar包依赖：
<!--解析网页数据-->
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.10.2</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
代码：
import com.maxinhai.world.utils.JdbcUtils;
import org.apache.http.HttpEntity;
import org.apache.http.StatusLine;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.sql.*;
import java.sql.Date;
import java.util.*;
/**
* @program: world
* @description: 雅拉伊图片爬虫
* @author: XinHai.Ma
* @create: 2021-10-21 20:33
*/
public class YaLaYiImageReptile {
// 解决问题: javax.net.ssl.SSLException: Received fatal alert: protocol_version
private static final PoolingHttpClientConnectionManager HTTP_CLIENT_CONNECTION_MANAGER;
private static final CloseableHttpClient HTTP_CLIENT;
static {
SSLContext ctx = SSLContexts.createSystemDefault();
SSLConnectionSocketFactory fac =
new SSLConnectionSocketFactory(ctx, new String[]{"SSLv2Hello", "TLSv1.2"}, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
HTTP_CLIENT_CONNECTION_MANAGER = new PoolingHttpClientConnectionManager(RegistryBuilder
.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.getSocketFactory())
.register("https", fac).build());
HTTP_CLIENT_CONNECTION_MANAGER.setDefaultMaxPerRoute(100);
HTTP_CLIENT_CONNECTION_MANAGER.setMaxTotal(200);
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(60000).setConnectTimeout(60000)
.setSocketTimeout(60000).build();
HTTP_CLIENT = HttpClientBuilder.create().setConnectionManager(HTTP_CLIENT_CONNECTION_MANAGER)
.setDefaultRequestConfig(requestConfig).build();
}
/**
* 报异常 => javax.net.ssl.SSLException: Received fatal alert: protocol_version
* @param args
*/
public static void main(String[] args) {
// 要爬取的页面
for(int i=1; i<=10; i++) {
if(i != 1) {
reptile("https://www.yalayi.com/gallery/index_" + i + ".html");
} else {
reptile("https://www.yalayi.com/gallery/");
}
}
}
private static void reptile(String url) {
try {
HttpGet httpGet = new HttpGet(url);
CloseableHttpResponse httpResponse = HTTP_CLIENT.execute(httpGet);
StatusLine statusLine = httpResponse.getStatusLine();
if(statusLine.getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
String result = EntityUtils.toString(httpEntity, "utf-8");
//System.out.println(statusLine + "=>" + result);
Document document = Jsoup.parse(result);
Elements urlElements = document.select("body > div.main.bgf6 > div.gallery-list.list-box > div > ul > li > div.img-box > a");
Elements imageElements = document.select("body > div.main.bgf6 > div.gallery-list.list-box > div > ul > li > div.img-box > a > img");
Elements titleElements = document.select("body > div.main.bgf6 > div.gallery-list.list-box > div > ul > li > div.text-box > p > a");
Elements sizeElements = document.select("body > div.main.bgf6 > div.gallery-list.list-box > div > ul > li > div.img-box > em");
List<Map<String, String>> dataList = new ArrayList<>();
for (int i = 0; i < titleElements.size(); i++) {
Element urlElement = urlElements.get(i);
Element imageElement = imageElements.get(i);
Element titleElement = titleElements.get(i);
Element sizeElement = sizeElements.get(i);
String href = urlElement.attr("href");
String src = imageElement.attr("src");
String title = titleElement.text();
String size = sizeElement.text();
System.out.println("标题:" + title + " 封面:" + src + " 画质:" + size + " 详情页:" + href);
Map<String, String> data = new HashMap<>();
data.put("pageUrl", href);
data.put("imageUrl", src);
data.put("title", title);
data.put("size", size);
dataList.add(data);
}
saveDate(dataList);
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 保存爬取数据
* @param dataList
*/
private static void saveDate(List<Map<String, String>> dataList) {
List<String> titleList = new ArrayList<>();
for (int i = 0; i < dataList.size(); i++) {
Map<String, String> data = dataList.get(i);
String title = data.get("title");
titleList.add(title);
}
// 查询已经爬取的数据，做筛选处理
List<String> resultList = query(titleList);
Iterator<Map<String, String>> iterator = dataList.iterator();
while (iterator.hasNext()) {
Map<String, String> next = iterator.next();
if(resultList.contains(next.get("title"))) {
iterator.remove();
}
}
// 获取数据库连接对象
Connection connection = JdbcUtils.getConnection();
// 插入数据
String insert_novel = "INSERT INTO `world`.`yalayi_image_reptile`(`is_active`, `is_delete`, `create_time`, `title`, `size`, `cover_url`, `page_url`) " +
"VALUES (?, ?, ?, ?, ?, ?, ?)";
try {
PreparedStatement preparedStatement = connection.prepareStatement(insert_novel);
for (int i = 0; i < dataList.size(); i++) {
Map<String, String> data = dataList.get(i);
preparedStatement.setInt(1, 0);
preparedStatement.setInt(2, 0);
preparedStatement.setDate(3, new Date(System.currentTimeMillis()));
preparedStatement.setString(4, data.get("title"));
preparedStatement.setString(5, data.get("size"));
preparedStatement.setString(6, data.get("imageUrl"));
preparedStatement.setString(7, data.get("pageUrl"));
preparedStatement.addBatch();
}
int[] row = preparedStatement.executeBatch();
System.out.println("插入" + row.length + "行");
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* in范围查询
* @param titleList
* @return
*/
private static List<String> query(List<String> titleList) {
List<String> titles = new ArrayList<>();
String sql = "SELECT title FROM `yalayi_image_reptile` where is_delete=0 and title in (?)";
String stringFromList = getStringFromList(titleList);
String formatSql = String.format(sql.replace("?", "%s"), stringFromList);
try {
Connection connection = JdbcUtils.getConnection();
PreparedStatement preparedStatement = connection.prepareStatement(formatSql);
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
String title = resultSet.getString(1);
titles.add(title);
}
} catch (SQLException e) {
e.printStackTrace();
}
return titles;
}
/**
* 格式化参数
* @param paramList
* @return
*/
private static String getStringFromList(List<String> paramList) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < paramList.size(); i++) {
if(i == paramList.size()-1) {
sb.append("'" + paramList.get(i) + "'");
} else {
sb.append("'" + paramList.get(i) + "'");
sb.append(",");
}
}
return sb.toString();
}
}
Ps: 1. 上面代码中没有对数据库连接做关闭处理，是因为其他代码会用到这个连接对象，就没有关闭；
2. document.select()方法里的css不会写没关系，在页面中找到你要爬取的dom节点，右键检查，就能看到html代码，选中要爬取的html标签，右键复制为selector即可；
原文地址：https://www.cnblogs.com/mxh-java/p/15440227.html
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