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反復給網站編寫不同的爬蟲邏輯太麻煩了,自己實現了一個小框架
可以自定義的部分有:
請求方式(默認為Getuser-agent為谷歌瀏覽器的設置),可以通過實現RequestSet接口來自定義請求方式
儲存方式(默認儲存在f盤的html文件夾下),可以通過SaveUtil接口來自定義保存方式
需要保存的資源(默認為整個html頁面)
篩選方式(默認所有url都符合要求),通過實現ResourseChooser接口來自定義需要保存的url和資源頁面
實現的部分有:
html頁面的下載方式,通過HttpClient實現html頁面的下載
html頁面的解析部分,通過jsoup實現html頁面的解析
HtmlDownloader類,用于根據一個url下載一個html頁面
package DownloadPackage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
/*
* 根據一個url下載一個html頁面
*/
public class HtmlDownloader {
RequestSet requestset = null;
public HtmlDownloader(RequestSet requestset){
this.requestset = requestset;
}
public String downloadhtml(String url){
String html = null;
//創建一個客戶端
//創建一個讀取流從entity讀取html
BufferedReader reader = null;
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpResponse response = null;
try {
response = httpclient.execute(requestset.getMethod(url));
HttpEntity entity = response.getEntity();
reader = new BufferedReader(new InputStreamReader(entity.getContent()));
StringBuilder sb = new StringBuilder();
while((html = reader.readLine()) != null){
sb.append(html);
}
html = sb.toString();
System.out.println("一個html頁面獲取成功");
}
catch (IOException e) {
System.out.println(url+"連接失敗");
}
finally{
if(reader != null){
try {
reader.close();
httpclient.close();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return html;
}
}
UrlGet類,用于根據一個html頁面獲得所有的url連接
package DownloadPackage;
import java.util.LinkedList;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class UrlGet {
public LinkedList<String> geturls(String html){
LinkedList<String> urls = new LinkedList<String>();
Document doc = Jsoup.parse(html);
Elements links = doc.getElementsByTag("a");
for (Element link:links){
String url = link.attr("href");
urls.add(url);
}
return urls;
}
}
資源選擇接口,需要實現三個方法,第一是isNeed方法,判斷url是否為需要的,第二個是isResourse方法,判斷url頁面是不是需要的資源頁面,第三個是process方法,
有時網頁上的url是我們需要的但是格式不對,對url進行加工
package ChoosePackage;
public interface ResourseChooser {
public Boolean isNeed(String url);
public Boolean isResourse(String url);
public String process(String url);
}
RequsetSet類,用于自定義請求方法的接口,實現getMethod方法獲取請求方法
package DownloadPackage;
import org.apache.http.client.methods.HttpGet;
/*
* 一個用于獲得Request請求的接口
* 實現getMethod方法獲取Get方法
*/
public interface RequestSet {
public HttpGet getMethod(String url);
}
Saveutil接口用于自定義保存方式,需要實現save方法
package SaveUtil;
/*
* 數據儲存的工具接口,必須實現保存方法
*/
public interface SaveUtil {
public void save(String url,String html);
}
Spider類,有五中構造方法,可以實現多種自定義操作,其中實現了上述自定義接口的默認實現類
package Spider;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import ChoosePackage.MyResourseChooser;
import ChoosePackage.ResourseChooser;
import DownloadPackage.HtmlDownloader;
import DownloadPackage.RequestSet;
import DownloadPackage.UrlGet;
import SaveUtil.MySaveUtil;
import SaveUtil.SaveUtil;
/*
* 用于爬取資源的類
*/
public class Spider{
public static void main(String[] args) {
new Spider("http://www.bilibili.net").spiderstart();
}
//種子url
String seed = null;
//用于保存數據的類,需要自己實現
private SaveUtil saveutil = null;
//html下載類
private HtmlDownloader downloader = null;
//url下載類
private UrlGet urldownloader = null;
//資源選擇工具
private ResourseChooser resoursechooser = null;
//用于保存未下載的網頁
LinkedList<String> unvisited = new LinkedList<String>();
//用于保存已下載的網頁
HashSet<String> visited = new HashSet<String>();
//自定義儲存方式,請求方式,資源篩選方式的構造方法
public Spider(SaveUtil saveutil,RequestSet request,ResourseChooser resoursechooser,String seed){
this.saveutil = saveutil;
this.downloader = new HtmlDownloader(request);
this.urldownloader = new UrlGet();
this.resoursechooser = resoursechooser;
this.seed = seed;
unvisited.add(seed);
}
//自定義儲存方式,資源篩選方式的構造方法
public Spider(SaveUtil saveutil,ResourseChooser resoursechooser,String seed){
this.resoursechooser = resoursechooser;
this.downloader = new HtmlDownloader(new getRequest());
this.saveutil = saveutil;
this.urldownloader = new UrlGet();
this.seed = seed;
unvisited.add(seed);
}
//自定義儲存方式,請求的構造方法
public Spider(SaveUtil saveutil,RequestSet requestset,String seed){
this.saveutil = saveutil;
this.downloader = new HtmlDownloader(requestset);
this.resoursechooser = new MyResourseChooser();
this.urldownloader = new UrlGet();
this.seed = seed;
unvisited.add(seed);
}
//自定義儲存方式的構造方法
public Spider(SaveUtil saveutil,String seed){
this.saveutil = saveutil;
this.downloader = new HtmlDownloader(new getRequest());
this.resoursechooser = (new MyResourseChooser());
this.urldownloader = new UrlGet();
this.seed = seed;
unvisited.add(seed);
}
//默認的爬蟲構造方法
public Spider(String seed){
this.saveutil = new MySaveUtil();
this.downloader = new HtmlDownloader(new getRequest());
this.resoursechooser = (new MyResourseChooser());
this.urldownloader = new UrlGet();
this.seed = seed;
unvisited.add(seed);
}
//開始爬取的方法
private void spiderstart(){
String html = null;
while(!unvisited.isEmpty()){
String url = unvisited.poll();
System.out.println("開始獲取"+url);
if(resoursechooser.isNeed(url)){
try{
html = downloader.downloadhtml(url);
}
catch(RuntimeException e){
System.out.println(url+"連接獲取失敗");
continue;
}
visited.add(url);
LinkedList<String> urls = new LinkedList<String>();
try{
urls = urldownloader.geturls(html);
}
catch(RuntimeException e){
System.out.println(url+"的html頁面為空");
continue;
}
Iterator<String> it = urls.iterator();
while(it.hasNext()){
String newurl = it.next();
if(resoursechooser.isNeed(newurl)&&!visited.contains(newurl)&&!unvisited.contains(newurl)){
newurl = resoursechooser.process(newurl);
unvisited.add(newurl);
System.out.println(newurl+"加入頁面");
}
}
System.out.println("獲取了"+url+"上的所有url");
if(resoursechooser.isResourse(url)){
saveutil.save(url,html);
}
}
}
}
//默認資源篩選類
private class MyResourseChooser implements ResourseChooser{
@Override
public Boolean isNeed(String url) {
// TODO Auto-generated method stub
if(!url.startsWith("/")&&!url.startsWith("http")){
return false;
}
return true;
}
@Override
public Boolean isResourse(String url) {
// TODO Auto-generated method stub
return true;
}
@Override
public String process(String url) {
// TODO Auto-generated method stub
if(!url.startsWith("http")){
url = seed+url;
}
return url;
}
}
public class getRequest implements RequestSet{
public HttpGet getMethod(String url) {
// TODO Auto-generated method stub
//創建一個get請求方法
HttpGet getmethod = new HttpGet(url);
//HttpHost proxy = new HttpHost("124.88.67.81",80);這里不設置代理IP
//設置請求超時時間等
RequestConfig responseconfig = RequestConfig.custom().setConnectionRequestTimeout(10000).setConnectTimeout(10000).setSocketTimeout(10000).build();
//設置請求頭,主要是user-agent
getmethod.addHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
//設置請求參數
getmethod.setConfig(responseconfig);
return getmethod;
}
}
//默認的存儲類
public class MySaveUtil implements SaveUtil{
@Override
public void save(String url, String html) {
// TODO Auto-generated method stub
String filename = getfilename(url);
BufferedWriter writer = null;
try{
writer = new BufferedWriter(new FileWriter(filename));
writer.write(html);
writer.flush();
System.out.println("文件寫入成功");
}
catch(IOException e){
System.out.println("文件寫入失敗");
}
finally{
try {
if(writer != null)
writer.close();
}
catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("流關閉失敗");
}
}
}
private String getfilename(String url){
String fileparentpath = "f://html";
File file = new File(fileparentpath);
if(!file.exists()){
file.mkdir();
}
int last = url.lastIndexOf(".");
int first = url.indexOf(".");
url = url.substring(first,last);
url = url.replaceAll("\\.", "");
url = url.replaceAll("/", "");
return fileparentpath+"/"+url+".txt";
}
}
}
總結
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