java 下载网络上的图片并保存到本地目录

`这里输入代码
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

public class DownloadImage {

/**
* [@param](https://my.oschina.net/u/2303379) args
* [@throws](https://my.oschina.net/throws) Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
download("http://ui.51bi.com/opt/siteimg/images/fanbei0923/Mid_07.jpg", "51bi.gif","c:\\image\\");
}

public static void download(String urlString, String filename,String savePath) throws Exception {
// 构造URL
URL url = new URL(urlString);
// 打开连接
URLConnection con = url.openConnection();
//设置请求超时为5s
con.setConnectTimeout(5*1000);
// 输入流
InputStream is = con.getInputStream();

// 1K的数据缓冲
byte[] bs = new byte[1024];
// 读取到的数据长度
int len;
// 输出的文件流
File sf=new File(savePath);
if(!sf.exists()){
sf.mkdirs();
}
OutputStream os = new FileOutputStream(sf.getPath()+"\\"+filename);
// 开始读取
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
// 完毕，关闭所有链接
os.close();
is.close();
}

}

`