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。
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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");
}
}
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运行结果：
希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/ithouse/article/details/50908296