Java实现HTTP文件下载

实现本地下载http文件，
/**
* 包为java.net.*

* 下载图片
* @param sourceFile 文件源路径
* @param targetFile 下载存放路径
* @throws IOException
*/
    public static void copyFile(String sourceFile, String targetFile) throws IOException {
    try {
URL url = new URL(sourceFile);
HttpURLConnection httpUrl = (HttpURLConnection) url.openConnection();
httpUrl.connect();
BufferedInputStream bis = new BufferedInputStream(httpUrl.getInputStream());
FileOutputStream fos = new FileOutputStream(targetFile);
int size = 0;
byte[] buf = new byte[8096];//此值可以调
while ((size = bis.read(buf)) != -1)
            fos.write(buf, 0, size);
        fos.close();
        bis.close();
        httpUrl.disconnect();
} catch (MalformedURLException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
    }