我想获得给定域的谷歌页面排名。
我使用以下代码谷歌 api 代码来获取 pagerank。我之前获得了页面排名。今天当我尝试运行相同的文件时，我遇到了一些问题，无法获得正确的页面排名。
import java.net.URLConnection;
import java.net.URL;
import java.io.InputStream;
/**
* <b>PageRankService provides simple API to Google PageRank Technology</b>
* <br>
* PageRankService queries google toolbar webservice and returns a
* google page rank retrieved from one of the next datacenters on the list.
* <br>toolbarqueries.google.com
* <br>64.233.161.100
* <br>64.233.161.101
* <br>64.233.177.17
* <br>64.233.183.91
* <br>64.233.185.19
* <br>64.233.189.44
* <br>66.102.1.103
* <br>66.102.9.115
* <br>66.249.81.101
* <br>66.249.89.83
* <br>66.249.91.99
* <br>66.249.93.190
* <br>72.14.203.107
* <br>72.14.205.113
* <br>72.14.255.107
*/
public class PageRankService {
static private int dataCenterIdx = 0;
/**
* List of available google datacenter IPs and addresses
*/
static final public String [] GOOGLE_PR_DATACENTER_IPS = new String[]{
"64.233.161.100",
"64.233.161.101",
"64.233.177.17",
"64.233.183.91",
"64.233.185.19",
"64.233.189.44",
"66.102.1.103",
"66.102.9.115",
"66.249.81.101",
"66.249.89.83",
"66.249.91.99",
"66.249.93.190",
"72.14.203.107",
"72.14.205.113",
"72.14.255.107",
"toolbarqueries.google.com",
};
/**
* Default constructor
*/
public PageRankService() {
}
/**
* Must receive a domain in form of: "http://www.domain.com"
* @param domain - (String)
* @return PR rating (int) or -1 if unavailable or internal error happened.
*/
public int getPR(String domain) {
int result = -1;
JenkinsHash jHash = new JenkinsHash();
String googlePrResult = "";
long hash = jHash.hash(("info:" + domain).getBytes());
String url = "http://"+GOOGLE_PR_DATACENTER_IPS[dataCenterIdx]+"/search?client=navclient-auto&hl=en&"+
"ch=6"+hash+"&ie=UTF-8&oe=UTF-8&features=Rank&q=info:" + domain;
try {
URLConnection con = new URL(url).openConnection();
InputStream is = con.getInputStream();
byte [] buff = new byte[1024];
int read = is.read(buff);
while (read > 0) {
googlePrResult = new String(buff, 0, read);
read = is.read(buff);
}
googlePrResult = googlePrResult.split(":")[2].trim();
result = new Long(googlePrResult).intValue();
} catch (Exception e) {
e.printStackTrace();
}
dataCenterIdx++;
if (dataCenterIdx == GOOGLE_PR_DATACENTER_IPS.length) {
dataCenterIdx = 0;
}
return result;
}
public static void main(String [] args) {
long start = System.currentTimeMillis();
PageRankService prService = new PageRankService();
String domain = "http://www.gmail.com";
if (args.length > 0) {
domain = args[0];
}
System.out.println("Checking " + domain);
System.out.println("Google PageRank: " + prService.getPR(domain));
System.out.println("Took: " + (System.currentTimeMillis() - start) + "ms");
}
}
但是今天我无法获得页面排名。我收到以下错误：
Checking http://www.google.com
Google PageRank: -1
java.io.IOException: Server returned HTTP response code: 504 for URL: http://64.233.161.100/search?client=navclient-auto&hl=en&ch=63513778613&ie=UTF-8&oe=UTF-8&features=Rank&q=info:http://www.google.com
Took: 179711ms
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1625)
at PageRankService.getPR(PageRankService.java:82)
at PageRankService.main(PageRankService.java:112)
BUILD SUCCESSFUL (total time: 3 minutes 0 seconds)
我哪里错了？