java爬取捧腹网段子

先上效果图：

准备工做：

/**
 * 创建http链接
 */
public static String Connect(String address) {
    HttpURLConnection conn = null;
    URL url = null;
    InputStream in = null;
    BufferedReader reader = null;
    StringBuffer stringBuffer = null;
    try {
        url = new URL(address);
        conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5000);
        conn.setReadTimeout(5000);
        conn.setDoInput(true);
        conn.connect();
        in = conn.getInputStream();
        reader = new BufferedReader(new InputStreamReader(in));
        stringBuffer = new StringBuffer();
        String line = null;
        while ((line = reader.readLine()) != null) {
            stringBuffer.append(line);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        conn.disconnect();
        try {
            in.close();
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return stringBuffer.toString();
}

/**
 * 用于将内容写入到磁盘文件
 * @param allText
 */
private static void writeToFile(String allText) {
    System.out.println("正在写入。。。");
    BufferedOutputStream bos = null;
    try {
        File targetFile = new File("/Users/shibo/tmp/pengfu.txt");
        File fileDir = targetFile.getParentFile();
        if (!fileDir.exists()) {
            fileDir.mkdirs();
        }
        if (!targetFile.exists()) {
            targetFile.createNewFile();
        }
        bos = new BufferedOutputStream(new FileOutputStream(targetFile, true));
        bos.write(allText.getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (null != bos) {
            try {
                bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    System.out.println("写入完毕。。。");
}

引入jsoup的jar包（用于解析dom）：

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.11.2</version>
</dependency>

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开始分析网站:

捧腹网段子
首先找到咱们须要的内容（做者、标题和正文）

查看其元素，我这里查看的是标题标签：

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知道其结构以后，就能够获取咱们想要的内容了：

public static void main(String[] args) {
        StringBuilder allText = new StringBuilder();
        for (int i = 1; i <= 50; i++) {
            System.out.println("正在爬取第" + i + "页内容。。。");
            // 创建链接，获取网页内容
            String html = ConnectionUtil.Connect("https://www.pengfu.com/xiaohua_" + i + ".html");
            // 将内容转换成dom格式，方便操做
            Document doc = Jsoup.parse(html);
            // 获取网页内全部标题节点
            Elements titles = doc.select("h1.dp-b");
            for (Element titleEle : titles) {
                Element parent = titleEle.parent();
                // 标题内容
                String title = titleEle.getElementsByTag("a").text();
                // 标题对应的做者
                String author = parent.select("p.user_name_list > a").text();
                // 标题对应的正文
                String content = parent.select("div.content-img").text();
                // 将内容格式化
                allText.append(title)
                        .append("\r\n做者：").append(author)
                        .append("\r\n").append(content)
                        .append("\r\n").append("\r\n");
            }
            allText.append("-------------第").append(i).append("页-------------").append("\r\n");
            System.out.println("第" + i + "页内容爬取完毕。。。");
        }

        //将内容写入磁盘
        Test.writeToFile(allText.toString());
    }

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参考文章：Python 爬虫入门(一)——爬取糗百