/**
* 从网络Url中下载文件
*
* @param urlStr url地址
* @param fileName 文件名
* @param savePath 保存路径
* @throws IOException
*/
public static String downLoadFromUrl(String urlStr, String fileName, String savePath) {
InputStream inputStream = null;
FileOutputStream fos = null;
try {
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//设置超时间为3秒
conn.setConnectTimeout(3 * 1000);
//防止屏蔽程序抓取而返回403错误
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
//得到输入流
inputStream = conn.getInputStream();
//获取自己数组
byte[] getData = readInputStream(inputStream);
if (getData.length <= 0) {
throw new Exception("this file is empty");
}
//文件保存位置
File saveDir = new File(savePath);
if (!saveDir.exists()) {
saveDir.mkdir();
}
File file = new File(saveDir + File.separator + fileName);
fos = new FileOutputStream(file);
fos.write(getData);
if (fos != null) {
fos.close();
}
if (inputStream != null) {
inputStream.close();
}
} catch (Exception e) {
//e.printStackTrace();
System.out.println("info:" + urlStr + " download failed:" + e.getMessage());
return savePath;
}
System.out.println("info:" + urlStr + " download success");
return savePath;
}
/**
* 从输入流中获取字节数组
*
* @param inputStream
* @return
* @throws IOException
*/
public static byte[] readInputStream(InputStream inputStream) throws IOException {
byte[] buffer = new byte[1024];
int len = 0;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while ((len = inputStream.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
bos.close();
return bos.toByteArray();
}
public static void main(String[] args) {
String url = "http://zhE2C45E21&jg";
String savePath = downLoadFromUrl(url, "11.jpg", "d:");
System.out.println(savePath);
}
从网络Url中下载文件
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Origin blog.csdn.net/weixin_55806809/article/details/121635946
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