最近由于工作需要，写了一个小的爬虫，主要用于爬取网易汽车车型库（http://product.auto.163.com/）上的不同品牌/车标（共175个车标）下不同车系（共1650个系列）的的图片（各八
最近由于工作需要，写了一个小的爬虫，主要用于爬取网易汽车车型库（http://product.auto.163.com/）上的不同品牌/车标（共175个车标）下不同车系（共1650个系列）的的图片（各八张）
代码下载
代码如下：
共CarBrand.java，CarCrawer.java，CarCrawerDemo.java三个文件。
实体
CarBrand.java
import java.util.ArrayList;
public class CarBrand
private String ppName;
private String ppUrl;
private ArrayList<CarBrand> ppList;
private String cxName;
private String cxUrl;
private ArrayList<CarBrand> cxList;
private String cxTpName;
private String cxTpUrl;
private ArrayList<CarBrand> cxTpList;
private String tpName;
private String tpNameUrl;
//getter() 和 setter() 省略
具体实现
CarCrawer.java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CarCrawer
public static String carUrl = "http://product.auto.163.com";
public static String SendGet(String url) {
// 定义一个字符串用来存储网页内容
String result = "";
// 定义一个缓冲字符输入流
BufferedReader in = null;
try {
// 将string转成url对象
URL realUrl = new URL(url);
// 初始化一个链接到那个url的连接
URLConnection connection = realUrl.openConnection();
// 开始实际的连接
connection.connect();
// 初始化 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream(), "GB2312"));
// 用来临时存储抓取到的每一行的数据
String line;
while ((line = in.readLine()) != null) {
// 遍历抓取到的每一行并将其存储到result里面
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
/**
* 下载文件到本地
*
* @param urlString
* 被下载的文件地址
* @param filename
* 本地文件名
* @throws
public static void download(String urlString, String filename,String savePath) throws Exception {
// 构造URL
URL url = new URL(urlString);
// 打开连接
URLConnection con = url.openConnection();
//设置请求超时为5s
con.setConnectTimeout(5*1000);
// 输入流
InputStream is = con.getInputStream();
// 1K的数据缓冲
byte[] bs = new byte[1024];
// 读取到的数据长度
int len;
// 输出的文件流
File sf=new File(savePath);
if(!sf.exists()){
sf.mkdirs();
}
OutputStream os = new FileOutputStream(sf.getPath()+"\\"+filename);
// 开始读取
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
// 完毕，关闭所有链接
os.close();
is.close();
}
public static void writeTxtFile(String content,String txtfilename)throws Exception{
FileWriter writer = new FileWriter(txtfilename, true);
writer.write(content);
writer.close();
}
public static ArrayList<CarBrand> removeDuplicate(ArrayList<CarBrand> list) {
List<CarBrand> newlist= new ArrayList<CarBrand>();
Set<String> set=new HashSet<String>();
for (CarBrand car:list) {
if (car == null) {continue;}
String str = car.getCxName();
if (str != null) {
if (!set.contains(str)) { //set中不包含重复的
set.add(str);
newlist.add(car);
}
}
}
return (ArrayList<CarBrand>) newlist;
}
/*
* @param url
* 示例 http://product.auto.163.com/brand/a/
*/
public static ArrayList<CarBrand> getPpUrl(String url) throws Exception {
ArrayList<CarBrand> ppList = new ArrayList<CarBrand>();
String content = CarCrawer.SendGet(url);
Pattern patternName = Pattern.compile("title=\"进入.{1,20}品牌频道");
Pattern patternUrl = Pattern.compile("<a href='/brand/[a-z]/.{1,20}' title");
Matcher matcherName = patternName.matcher(content);
Matcher matcherUrl = patternUrl.matcher(content);
while(matcherName.find()&&matcherUrl.find()){
CarBrand carBrand = new CarBrand();
carBrand.setPpName(matcherName.group(0).substring(9, matcherName.group(0).length()-4));
carBrand.setPpUrl(carUrl+matcherUrl.group(0).substring(9, matcherUrl.group(0).length()-7));
//System.out.println(carBrand.getPpName()+": "+carBrand.getPpUrl());
ppList.add(carBrand);
}
return ppList;
}
/*
* @param url
* 示例 http://product.auto.163.com/brand/a/
*/
public static ArrayList<CarBrand> getCxUrl(String url) throws Exception {
ArrayList<CarBrand> cxPicList = new ArrayList<CarBrand>();
String content = CarCrawer.SendGet(url);
//Pattern pattern = Pattern.compile("class=\"group\">.*<div class=\"gbox gbox2\" >");
//Matcher matcher = pattern.matcher(content);
int i=0;
while(content.indexOf("class=\"group\">",i)>0){
int subS = content.indexOf("class=\"group\">",i);
int subE = content.indexOf("<div class=\"gbox gbox2\" >",i);
String subContent = content.substring(subS, subE);
i=subE+10;
//System.out.println("subContent "+subContent);
Pattern patternTitle = Pattern.compile("频道\">进入.{1,20}品牌频道</a>]</span>");
Matcher matcherTitle = patternTitle.matcher(subContent);
String strtitle= null;
if(matcherTitle.find()){
strtitle = matcherTitle.group(0).substring(6, matcherTitle.group(0).length()-16);
}
Pattern patternName = Pattern.compile("\"查看.{1,20}图片\">");
Pattern patternUrl = Pattern.compile("/series/photo/.{10,20}\"");
Matcher matcherName = patternName.matcher(subContent);
Matcher matcherUrl = patternUrl.matcher(subContent);
while(matcherName.find()&&matcherUrl.find()){
CarBrand carBrand = new CarBrand();
carBrand.setPpName(strtitle);
//System.out.println(carBrand.getPpName());
carBrand.setCxName(matcherName.group(0).substring(3, matcherName.group(0).length()-4));
carBrand.setCxUrl(carUrl+matcherUrl.group(0).substring(0, matcherUrl.group(0).length()-1));
//System.out.println(carBrand.getCxName()+": "+carBrand.getCxUrl());
cxPicList.add(carBrand);
}
}
return cxPicList;
}
/*
* @param url
* 示例 http://product.auto.163.com/series/photo/2350.html#CX001
*/
public static ArrayList<CarBrand> getCxPic(String url) throws Exception {
ArrayList<CarBrand> cxPicList = new ArrayList<CarBrand>();
String content = CarCrawer.SendGet(url);
Pattern pattern = Pattern.compile("http://product.auto.163.com/picture/photoview.{30,40}.html");
Matcher matcher = pattern.matcher(content);
int num=1;
while(matcher.find()&&num<9){
CarBrand carBrand = new CarBrand();
if(num==1){ carBrand.setCxTpName("左前");} else if(num==2){ carBrand.setCxTpName("正前");
}else if(num==3){ carBrand.setCxTpName("正侧"); } else if(num==4){ carBrand.setCxTpName("左后");
}else if(num==5){ carBrand.setCxTpName("正后"); } else if(num==6){ carBrand.setCxTpName("车顶");
}else if(num==7){ carBrand.setCxTpName("前大灯局部"); } else if(num==8){ carBrand.setCxTpName("后大灯局部");
}else{ System.out.println("Error: num = "+num); return null;}
carBrand.setCxTpUrl(matcher.group(0));
//System.out.println(carBrand.getCxTpName()+": "+matcher.group(0));
num = num + 1;
cxPicList.add(carBrand);
}
return cxPicList;
}
public static String getBigPic(String url) throws Exception {
String bigPicUrl = null;
String content = CarCrawer.SendGet(url);
Pattern pattern = Pattern.compile("<img class=\"main_photo hidden\" src=\".{60,70}.jpg");
Matcher matcher = pattern.matcher(content);
if(matcher.find()){
//System.out.println(matcher.group(0).substring(41));
bigPicUrl = matcher.group(0).substring(41);
}
return
调用
CarCrawerDemo.java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CarCrawerDemo {
public static String carUrl = "http://product.auto.163.com";
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
//保存路径 D:\\CarPic\\
String savePath = "D:\\CarTp\\";
//文件名 奥迪__奥迪Q5_2017款_左后.jpg
String filename = "";
//txt文件名
String txtfilename=savePath+"output.txt";
String url = "http://product.auto.163.com/brand/";
System.out.println(url);
ArrayList<CarBrand> pplist = CarCrawer.getPpUrl(url);
System.out.println(pplist.size());
ArrayList<CarBrand> cxUrllistNew = new ArrayList<CarBrand>();
Set<String> ppUrlSet=new HashSet<String>();
for(CarBrand pp:pplist){
String ppUrlStr= pp.getPpUrl().substring(0, 36);
if (!ppUrlSet.contains(ppUrlStr)) { //set中不包含重复的
ppUrlSet.add(ppUrlStr);
ArrayList<CarBrand> cxUrllist = CarCrawer.getCxUrl(pp.getPpUrl());
cxUrllistNew.addAll(cxUrllist);
}
}
System.out.println(cxUrllistNew.size());
CarCrawer.writeTxtFile("\nCalendar: "+Calendar.getInstance(),txtfilename);
for(CarBrand cxUrlNew:cxUrllistNew){
//System.out.println(cxUrlNew.getPpName()+" "+cxUrlNew.getCxName()+" "+cxUrlNew.getCxUrl());
ArrayList<CarBrand> cxTplist = CarCrawer.getCxPic(cxUrlNew.getCxUrl());
for(CarBrand cxTp:cxTplist){
String tpName = cxUrlNew.getPpName()+"_"+cxUrlNew.getCxName()+"_"+cxTp.getCxTpName()+".jpg";
String tpNameUrl = CarCrawer.getBigPic(cxTp.getCxTpUrl());
//System.out.println(tpName+" "+tpNameUrl);
CarCrawer.writeTxtFile("\n"+tpName+" "+tpNameUrl,txtfilename);
if(tpName!=null&&tpNameUrl!=null){
CarCrawer.download(tpNameUrl, tpName, savePath);
}
}
}
System.out.println("finished!");
下载结果：
改进点：
1 没有爬取每个车系的年款；
2 库有点小，车辆主要是小型车，
3 代码速度要进一步优化。