在這里主要通過流分析，通過java模擬訪問頁面獲取到頁面的html元素，并通過jsoup來分析獲取到的html元素，

然后通過流處理來將圖片保存到本機

package getpicture;import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Scanner;import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements;public class getPicture {public static void main(String[] args) {new Thread(new Spider()).start();} }// 抓網(wǎng)頁, 并分析出圖片地址 class Spider implements Runnable {private String firstUrl = "http://jandan.net/ooxx/page-"; //1111#commentsprivate String connUrl = "#comments";private int beginIndex = 1115;private String preHtml;//private String testPath="http://www.mop.com/#";private String mSavePath;public Spider() {};@Overridepublic void run() {try {URL newURL = new URL(firstUrl + beginIndex + connUrl);//URL newURL = new URL(testPath);HttpURLConnection conn = (HttpURLConnection) newURL.openConnection();conn.setRequestProperty("Connection","keep-alive");conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36");conn.setDoInput(true);conn.setDoOutput(true);OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(),"utf-8");out.flush();out.close(); InputStream inputStream = conn.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));String line;//讀取頁面html元素while ((line = reader.readLine()) != null) { preHtml+=line; }System.out.println(preHtml);//當頁面訪問成功時，解析頁面元素，獲取頁面圖片元素if(conn.getResponseCode()==200){Document doc=Jsoup.parse(preHtml);Elements elements = doc.select(".row img");for(Element e : elements) {String imgSrc = e.attr("src");new Thread(new DownloadImage(imgSrc)).start();}}}catch(Exception e) {e.printStackTrace();}} }class DownloadImage implements Runnable {private String imageSrc;private String imageName;public DownloadImage(String imageSrc) {this.imageSrc = imageSrc;}@Overridepublic void run() {String[] splits = imageSrc.split("/");imageName = splits[splits.length - 1];Date date=new Date();SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd"); String random=sdf.format(date);File file = new File("E:\\picture\\"+sdf+"\\"+imageName);// 如果路徑不存在,則創(chuàng)建 if (!file.getParentFile().exists()) { file.getParentFile().mkdirs(); } //判斷文件是否存在，不存在就創(chuàng)建文件if(!file.exists()&& !file .isDirectory()) {try {file.createNewFile();} catch (IOException e) {// TODO Auto-generated catch block e.printStackTrace();}} System.out.println("開始下載圖片：" + imageName); try {URL newURL = new URL("http:"+imageSrc);HttpURLConnection conn = (HttpURLConnection) newURL.openConnection();conn.setRequestProperty("Connection","keep-alive");conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36");conn.setDoInput(true);conn.setDoOutput(true);//通過輸入流獲取圖片數(shù)據(jù)InputStream inputStream = conn.getInputStream();//BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));byte[] data=new byte[1024];//創(chuàng)建輸出流 FileOutputStream fos = new FileOutputStream(file); int len = 0; //使用一個輸入流從buffer里把數(shù)據(jù)讀取出來 while( (len=inputStream.read(data)) != -1 ){ //用輸出流往buffer里寫入數(shù)據(jù)，中間參數(shù)代表從哪個位置開始讀，len代表讀取的長度 fos.write(data, 0, len); } fos.flush();fos.close();System.out.println("下載完成：" + imageName);}catch(Exception e) {System.err.println(" 這個圖片下載不了哇！\n刪除妹子" + imageName);return;}} } View Code

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轉載于:https://www.cnblogs.com/feitianshaoxai/p/6595381.html

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