Java从网络上读取图片并保存至本地

实例

public class GetUrlPic { 
     public static void main(String[] args) throws Exception {  
  //new一个URL对象  
  URL url = new URL("http://www.gz135.cn/data/attachment/forum/201702/13/165605xyayykq5vy4h81vy.jpg");  
  //打开链接  
  HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
  //设置请求方式为"GET"  
  conn.setRequestMethod("GET");  
  //超时响应时间为5秒  
  conn.setConnectTimeout(5 * 1000);  
  //通过输入流获取图片数据  
  InputStream inStream = conn.getInputStream();  
  //得到图片的二进制数据，以二进制封装得到数据，具有通用性  
  byte[] data = readInputStream(inStream);  
  //new一个文件对象用来保存图片，默认保存当前工程根目录  
  File imageFile = new File("pic20170419.jpg");  
  //创建输出流  
  FileOutputStream outStream = new FileOutputStream(imageFile);  
  //写入数据  
  outStream.write(data);  
  //关闭输出流  
  outStream.close();  
 }  
 public static byte[] readInputStream(InputStream inStream) throws Exception{  
  ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
  //创建一个Buffer字符串  
  byte[] buffer = new byte[1024];  
  //每次读取的字符串长度，如果为-1，代表全部读取完毕  
  int len = 0;  
  //使用一个输入流从buffer里把数据读取出来  
  while( (len=inStream.read(buffer)) != -1 ){  
   //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度  
   outStream.write(buffer, 0, len);  
  }  
  //关闭输入流  
  inStream.close();  
  //把outStream里的数据写入内存  
  return outStream.toByteArray();  
 }  

}

转自：http://www.jb51.net/article/111540.htm