package getUrlPic;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class GetUrlPic {
 
 public static void main(String[] args) throws Exception { 
  //new一個(gè)URL對(duì)象 
  URL url = new URL("http://www.gz135.cn/data/attachment/forum/201702/13/165605xyayykq5vy4h81vy.jpg"); 
  //打開(kāi)鏈接 
  HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 
  //設(shè)置請(qǐng)求方式為"GET" 
  conn.setRequestMethod("GET"); 
  //超時(shí)響應(yīng)時(shí)間為5秒 
  conn.setConnectTimeout(5 * 1000); 
  //通過(guò)輸入流獲取圖片數(shù)據(jù) 
  InputStream inStream = conn.getInputStream(); 
  //得到圖片的二進(jìn)制數(shù)據(jù)，以二進(jìn)制封裝得到數(shù)據(jù)，具有通用性 
  byte[] data = readInputStream(inStream); 
  //new一個(gè)文件對(duì)象用來(lái)保存圖片，默認(rèn)保存當(dāng)前工程根目錄 
  File imageFile = new File("pic20170419.jpg"); 
  //創(chuàng)建輸出流 
  FileOutputStream outStream = new FileOutputStream(imageFile); 
  //寫(xiě)入數(shù)據(jù) 
  outStream.write(data); 
  //關(guān)閉輸出流 
  outStream.close(); 
 } 
 public static byte[] readInputStream(InputStream inStream) throws Exception{ 
  ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
  //創(chuàng)建一個(gè)Buffer字符串 
  byte[] buffer = new byte[1024]; 
  //每次讀取的字符串長(zhǎng)度，如果為-1，代表全部讀取完畢 
  int len = 0; 
  //使用一個(gè)輸入流從buffer里把數(shù)據(jù)讀取出來(lái) 
  while( (len=inStream.read(buffer)) != -1 ){ 
   //用輸出流往buffer里寫(xiě)入數(shù)據(jù)，中間參數(shù)代表從哪個(gè)位置開(kāi)始讀，len代表讀取的長(zhǎng)度 
   outStream.write(buffer, 0, len); 
  } 
  //關(guān)閉輸入流 
  inStream.close(); 
  //把outStream里的數(shù)據(jù)寫(xiě)入內(nèi)存 
  return outStream.toByteArray(); 
 } 

}