Java gadget: Crawling resources via URL connection (picture)

Java language to write a simple crawl site Image tool, the implementation of simple:

• Get a URL connection via java.net.HttpURLConnection
• HttpURLConnection connection successfully returned a java.io.InputStream, by InputStream reading the picture into the byte array buff
• Picture data in the memory buff is written to the Test.jpg file by Bufferedoutputstream (new FileOutputStream ("Test.jpg"))

The Catchimg.java code for the tool class is given below:

/** * @Title: Catchimg.java * @Package web1203.tools * @Description: TODO (describe the file in a word) * @author Penny * @date 2017 12 3rd pm 9:00:05 * @version V1.0 */package web1203.tools;import java.io.bufferedinputstream;import Java.io.bufferedoutputstream;import Java.io.file;import Java.io.fileoutputstream;import java.io.IOException; Import Java.io.inputstream;import Java.io.outputstream;import Java.net.httpurlconnection;import Java.net.malformedurlexception;import java.net.url;/** * @ClassName: catchimg * @Description: Crawl A network picture of a specified address * @author PE Nny * @date December 3, 2017 pm 9:00:05 * */public class Catchimg {/** * * @Title: GETIMG * @Description: Through a  URL to get the picture * @param @param URL Image of the connection address * @param @throws ioexception * @throws * */public static void        getimg (String URL) throws ioexception{long startTime = System.currenttimemillis (); URL imgurl = new URL (Url.trim ());//convert URL httpurlconnection urlconn = (httpurlconnection) imgurl.openconnEction ();//Construct Connection Urlconn.setrequestproperty ("User-agent", "mozilla/5.0" (Windows NT 10.0; Win64;        x64) applewebkit/537.36 (khtml, like Gecko) chrome/61.0.3163.79 safari/537.36 ");        Urlconn.connect ();        System.out.println (CatchIMG.class.toString () + ": Get connection =" +urlconn.getresponsemessage ()); if (Urlconn.getresponsecode () ==200) {//Return the status code is 200 for success InputStream ins = Urlconn.getinputstream ();//Get input stream, read number from website            In-memory outputstream out = new Bufferedoutputstream (New FileOutputStream ("test.jpg"));            int len=0; byte[] Buff = new byte[1024*10];//10k buffer stream depends on your memory size while ( -1!= (len= (New Bufferedinputstream (INS)). Re AD (Buff))) {//length saved to Len, content put into buff out.write (buff, 0, Len);//write image array contents to picture file//System.out.println            (CatchIMG.class.toString () + ":" +len+ "Byte has been written to the file, content:" +new String (Buff));            } urlconn.disconnect ();            Ins.close ();            Out.close (); System. Out.println (CatchIMG.class.toString () + ": Get picture complete, time consuming =" + ((System.currenttimemillis ()-starttime)/1000) + "s"); }}/** * @throws IOException * @Title: Main * @Description: Test method * @throws */Public STA     tic void Main (string[] args) throws IOException {catchimg.getimg ("https://files.cnblogs.com/files/humi/wc.bmp");// }}

The picture to get in the test is this https://files.cnblogs.com/files/humi/wc.bmp

Final effect

Java gadget: Crawling resources via URL connection (picture)