java爬取图片-使用jsoup通过关键字爬取图片

1、导入jar包

主要有三个包：
		1、conmmons-io-2.6.jar
		2、joda-time-2.0.jar
		3、jsoup-1.11.3.jar

2、上代码：

package com.mdr.conn;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringEscapeUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
 
// 爬取百度图片
public class JsoupBaidu2 {
    public static void main(String[] args) throws Exception{
        String downloadPath = "E:\\picc\\baidu";
        List<String> list = nameList("美女");//关键字
        getPictures(list,30000,downloadPath); //1代表下载一页，一页一般有30张图片
    }
    // key为关键词,max作为爬取的页数
    public static void getPictures(List<String> keywordList, int max,String downloadPath) throws Exception{
        String gsm=Integer.toHexString(max)+"";
        String finalURL = "";
        String tempPath = "";
        for(String keyword : keywordList){
            tempPath = downloadPath;
            if(!tempPath.endsWith("\\")){
                tempPath = downloadPath+"\\";
            }
            tempPath = tempPath+keyword+"\\";
            File f = new File(tempPath);
            if(!f.exists()){
                f.mkdirs();
            }
            int picCount = 1;
            for(int page=0;page<=max;page++) {
                sop("正在下载第"+page+"页面");
                Document document = null;
                try {
                    String url ="http://image.baidu.com/search/avatarjson?tn=resultjsonavatarnew&ie=utf-8&word="+keyword+"&cg=star&pn="+page*100+"&rn=30&itg=0&z=0&fr=&width=&height=&lm=-1&ic=0&s=0&st=-1&gsm="+Integer.toHexString(page*100);
                    sop(url);
                    document = Jsoup.connect(url).data("query", "Java")//请求参数
                            .userAgent("Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)")//设置urer-agent  get();
                            .timeout(5000)
                            .get();
                    String xmlSource = document.toString();
                    xmlSource = StringEscapeUtils.unescapeHtml3(xmlSource);
                    sop(xmlSource);
                    String reg = "objURL\":\"http://.+?\\.jpg";
                    Pattern pattern = Pattern.compile(reg);
                    Matcher m = pattern.matcher(xmlSource);
                    while (m.find()) {
                        finalURL = m.group().substring(9);
                        sop(keyword+picCount+++":"+finalURL);
                        download(finalURL,tempPath);
                        sop("             下载成功");
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        sop("下载完毕");
        delMultyFile(downloadPath);//删除所有空图
        sop("已经删除所有空图");
    }
    public static void delMultyFile(String path){//删除所有空图
        File file = new File(path);
        if(!file.exists())
            throw new RuntimeException("File \""+path+"\" NotFound when excute the method of delMultyFile()....");
        File[] fileList = file.listFiles();
        File tempFile=null;
        for(File f : fileList){
            if(f.isDirectory()){
                delMultyFile(f.getAbsolutePath());
            }else{
                if(f.length()==0)
                    sop(f.delete()+"---"+f.getName());
            }
        }
    }
    //关键字处理
    public static List<String> nameList(String nameList){
        List<String> arr = new ArrayList<String>();
        String[] list;
        if(nameList.contains(","))
            list= nameList.split(",");
        else if(nameList.contains("、"))
            list= nameList.split("、");
        else if(nameList.contains(" "))
            list= nameList.split(" ");
        else{
            arr.add(nameList);
            return arr;
        }
        for(String s : list){
            arr.add(s);
        }
        return arr;
    }
    //打印语句
    public static void sop(Object obj){
        System.out.println(obj);
    }
    //根据图片网络地址下载图片
    public static void download(String url,String path){
        //path = path.substring(0,path.length()-2);
        File file= null;
        File dirFile=null;
        FileOutputStream fos=null;
        HttpURLConnection httpCon = null;
        URLConnection  con = null;
        URL urlObj=null;
        InputStream in =null;
        byte[] size = new byte[1024];
        int num=0;
        try {
            String downloadName= url.substring(url.lastIndexOf("/")+1);
            dirFile = new File(path);
            if(!dirFile.exists() && path.length()>0){
                if(dirFile.mkdir()){
                    sop("creat document file \""+path.substring(0,path.length()-1)+"\" success...\n");
                }
            }else{
                file = new File(path+downloadName);
                fos = new FileOutputStream(file);
                if(url.startsWith("http")){
                    urlObj = new URL(url);
                    con = urlObj.openConnection();
                    httpCon =(HttpURLConnection) con;
                    in = httpCon.getInputStream();
                    while((num=in.read(size)) != -1){
                        for(int i=0;i<num;i++)
                            fos.write(size[i]);
                    }
                }
            }
        }catch (FileNotFoundException notFoundE) {
            sop("找不到该网络图片....");
        }catch(NullPointerException nullPointerE){
            sop("找不到该网络图片....");
        }catch(IOException ioE){
            sop("产生IO异常.....");
        }catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

3、结果如下：

4.转载来源：

转载来源https://blog.csdn.net/qq_35508033/article/details/79099158