读取网络文件写到本地

package file;

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

/**
 * 读取网络文件写到本地
 */
public class InputStreamTest {

    public static void main(String[] args) throws Exception {

        // 网络附件url
        String path = "http://www.pptbz.com/pptpic/UploadFiles_6909/201203/2012031220134655.jpg";
        //保存到本地F盘
        String name = "F:\\2012031220134655.jpg";

        URL url = new URL(path);
        //链接url
        URLConnection uc = url.openConnection();
        //获取输入流
        InputStream in = uc.getInputStream();
        byte[] data = readInputStream(in);
        File file = new File(name);
        FileOutputStream outputStream = null;
        try {
            outputStream = new FileOutputStream(file);
            outputStream.write(data);
        } catch (Exception e) {

        } finally {
            outputStream.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();
    }

}