最近需要在網上找一寫圖片，所以寫了一個爬取圖片的程式，新手有寫的不足之處還請各位大佬指點一二。

原始碼如下

package com.sysh.ssm.service;
import org.apache.commons.lang3.StringEscapeUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author:
 * @Date:2018/5/22
 */
public class SpiderPicturesFromBaiduByWord {


    public static void main(String[] args) throws Exception{
        String downloadPath = "C:\\sunhoo\\image";

        System.out.println("輸入爬取關鍵字（可用空格，、號分隔多個想爬的關鍵字）：");
        Scanner KeyWord = new Scanner(System.in);
        String Word =KeyWord.nextLine();
        System.out.println("輸入要下載的頁數（1表示一頁，一頁有30張圖片）");
        Integer pageSize=KeyWord.nextInt();
        List<String> list = nameList(Word);
        getPictures(list,pageSize,downloadPath); //1代表下載一頁，一頁一般有30張圖片
    }


    public static void getPictures(List<String> keywordList, int max,String downloadPath) throws Exception{ // key為關鍵詞,max作為爬取的頁數
        String gsm=Integer.toHexString(max)+"";
        String finalURL = "";
        String tempPath = "";
        //每頁的數量
        Integer pagenumber=10;
        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("正在下載第"+page+"頁面");
                Document document = null;
                try {
                    String url ="http://image.baidu.com/search/avatarjson?tn=resultjsonavatarnew&ie=utf-8&word="+keyword+"&cg=star&pn="+page*pagenumber+"&rn=30&itg=0&z=0&fr=&width=&height=&lm=-1&ic=0&s=0&st=-1&gsm="+Integer.toHexString(page*pagenumber);
                    //String url ="https://image.baidu.com/search/index?tn=baiduimage&ipn=r&ct=201326592&cl=2&lm=-1&st=-1&fm=result&fr=&sf=1&fmq=1540974009530_R&pv=&ic=0&nc=1&z=&se=1&showtab=0&fb=0&width=&height=&face=0&istype=2&ie=utf-8&word=%E5%8D%8E%E5%B1%B1"+Integer.toHexString(page*30);
                    sop(url);
                    document = Jsoup.connect(url).data("query", "Java")//請求引數
                            .userAgent("Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)")//設定urer-agent  get();
                            .timeout(5000)
                            .get();
                    String xmlSource = document.toString();
                    xmlSource = StringEscapeUtils.unescapeHtml3(xmlSource);
                    sop("頁面"+xmlSource.length());
                    String reg = "objURL\":\"http://.+?\\.jpg";
                    Pattern pattern = Pattern.compile(reg);
                    Matcher m = pattern.matcher(xmlSource);
                    sop("mmm"+m);
                    while (m.find()) {
                        finalURL = m.group().substring(9);
                        sop(keyword+picCount+++":"+finalURL);
                        download(finalURL,tempPath);
                        sop("下載成功");
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        sop("下載完畢");
        delMultyFile(downloadPath);
        sop("已經刪除所有空圖");
    }
    public static void delMultyFile(String path){
        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());}
            }
        }
    }
    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;
    }
    public static void sop(Object obj){
        System.out.println(obj);
    }
    //根據圖片網路地址下載圖片
    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("找不到該網路圖片....");
        }catch(NullPointerException nullPointerE){
            sop("找不到該網路圖片....");
        }catch(IOException ioE){
            sop("產生IO異常.....");
        }catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}