IO流实现网络图片下载(java实现)

用流的方式在实现对网络图片的下载

分析:

参数:

图片的网络地址:webURL

保存到本地地址:localPath

监听器:判断是否下载成功(这是一个观察者模式)

具体代码如下:

import java.io.*;

import java.net.URL;

import java.net.URLConnection;

/**
 * @author test
 */
public class DownLoadPicture {
    public static void main(String[] args) {
        //网络图片链接地址
        String webURL = "https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1468179265,2584742085&fm=26&gp=0.jpg";
        //本地保存地址
        String localPath = "D:\\test\\picture.jpg";
        downLoadJpg(webURL, localPath);
    }

    public static void downLoadJpg(String webURL, String localPath) {
        try {
            //网络URL
            URL url = new URL(webURL);
            //打开网络连接
            URLConnection connection = url.openConnection();
            //输入流
            InputStream inputStream = connection.getInputStream();
            //输出文件流
            OutputStream outputStream = new FileOutputStream(new File(localPath));
            //缓冲区对象
            byte[] b = new byte[1024];
            //读取计数器
            int len;
            while ((len = inputStream.read(b)) != -1) {
                outputStream.write(b, 0, len);
            }
            //关闭输入流操作
            try {
                inputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            //关闭输出流操作
            try {
                outputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            //监听下载成功
        } catch (Exception e) {
            //监听下载失败
            e.printStackTrace();
        }
    }
}