使用URLConnection下载一张图片

创建的缓存为1024个字节

public class DownLoad {
  public static void main(String[] args) {
    String path="http://www.itszt.com/img/stu6.png";
    try {
      try {
//        读取字节数据
        InputStream mInputStream=new URL(path).openConnection().getInputStream();
//        把字节数据写出到磁盘上
        OutputStream mOutputStream=new FileOutputStream("d:\\download.png");
        byte[] bs=new byte[1024];
        int i=-1;
        while((i=mInputStream.read(bs))!=-1){
//          i为读到的有效字节数
          mOutputStream.write(bs,0,i);
        }
        mInputStream.close();
        mOutputStream.close();
        
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }

}