本文实例讲述了Java实现爬取往期所有双色球开奖结果功能。分享给大家供大家参考，具体如下：
梦想还是要有的，万一实现了呢？我相信经常买双色球的朋友和我都会有一个疑问，就是往期双色球的开奖结果是什么？我钟意的这一注双色球在往期是否开过一等奖，如果开过的话，基本上可以放弃这一注了，因为历史上应该没有出现过两期双色球开奖完全一致的吧？那么往期的开奖结果是什么呢？我自己用Java写了一个简易的类，爬取所有双色球开奖结果，本来想开发安卓版本的，由于UI等需要时间准备，有缘再开发吧。
import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.regex.Matcher;import java.util.regex.Pattern;import java.util.zip.GZIPInputStream;public class AllBalls { private static StringBuffer mStringBuffer; public static void main(String[] args) { System.out.println("正在获取..."); mStringBuffer = new StringBuffer(); String baseUrlPrefix = "http://kaijiang.zhcw.com/zhcw/html/ssq/list_"; String baseUrlSuffix = ".html"; String homeUrl = "http://kaijiang.zhcw.com/zhcw/html/ssq/list_1.html"; String pageCountContent = getHtmlString(homeUrl); int pageCount = getPageCount(pageCountContent); if (pageCount > 0) { for (int i = 1; i <= pageCount; i++) { String url = baseUrlPrefix + i + baseUrlSuffix; String pageContent = getHtmlString(url); if (pageContent != null && !pageContent.equals("")) { getOneTermContent(pageContent); } else { System.out.println("第" + i + "页丢失"); } try { Thread.sleep(1200); } catch (Exception e) { // TODO: handle exception } } File file = new File("双色球.txt"); if (file.exists()) { file.delete(); } try { FileWriter writer = new FileWriter(file); BufferedWriter bufferedWriter = new BufferedWriter(writer); bufferedWriter.write(mStringBuffer.toString()); bufferedWriter.close(); writer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //BufferedWriter writer = new BufferedWriter(new OutputS) } else { System.out.println("结果页数为0"); } System.out.println("完成！"); } /** * 获取总页数 * @param result */ private static int getPageCount(String result) { String regex = "//d+/">末页"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(result); String[] splits = null; while (matcher.find()) { String content = matcher.group(); splits = content.split("/""); break; } if (splits != null && splits.length == 2) { String countString = splits[0]; if (countString != null && !countString.equals("")) { return Integer.parseInt(countString); } } return 0; } /** * 获取网页源码 * @return */ private static String getHtmlString(String targetUrl) { String content = null; HttpURLConnection connection = null; try { URL url = new URL(targetUrl); connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("POST"); connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows 7)"); connection.setRequestProperty("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*"); connection.setRequestProperty("Accept-Language", "zh-cn"); connection.setRequestProperty("UA-CPU", "x86"); //为什么没有deflate呢 connection.setRequestProperty("Accept-Encoding", "gzip"); connection.setRequestProperty("Content-type", "text/html"); //keep-Alive，有什么用呢，你不是在访问网站，你是在采集。嘿嘿。减轻别人的压力，也是减轻自己。 connection.setRequestProperty("Connection", "close"); //不要用cache，用了也没有什么用，因为我们不会经常对一个链接频繁访问。（针对程序） connection.setUseCaches(false); connection.setConnectTimeout(6 * 1000); connection.setReadTimeout(6 * 1000); connection.setDoOutput(true); connection.setDoInput(true); connection.setRequestProperty("Charset", "utf-8"); connection.connect(); if (200 == connection.getResponseCode()) { InputStream inputStream = null; if (connection.getContentEncoding() != null && !connection.getContentEncoding().equals("")) { String encode = connection.getContentEncoding().toLowerCase(); if (encode != null && !encode.equals("") && encode.indexOf("gzip") >= 0) { inputStream = new GZIPInputStream(connection.getInputStream()); } } if (null == inputStream) { inputStream = connection.getInputStream(); } BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8")); StringBuilder builder = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { builder.append(line).append("/n"); } content = builder.toString(); } } catch (Exception e) { e.printStackTrace(); } finally { if (connection != null) { connection.disconnect(); } } return content; } private static void getOneTermContent(String pageContent) { String regex = "<td align=/"center/" style=/"padding-left:10px;/">[//s//S]+?</em></td>"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(pageContent); while (matcher.find()) { String oneTermContent = matcher.group(); getOneTermNumbers(oneTermContent); } } private static void getOneTermNumbers(String oneTermContent) { String regex = ">//d+<"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(oneTermContent); while (matcher.find()) { String content = matcher.group(); String ballNumber = content.substring(1, content.length()-1); mStringBuffer.append(ballNumber).append(" "); } mStringBuffer.append("/r/n"); }}运行结果：
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