http下载文件

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * http下载文件
 * @author 相思子
 *
 */
public class HttpDownloadFileUtil {
    
    
	
	/**
     * 从网络Url中下载文件
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static void downLoadFromUrl(String urlStr, String fileName,String savePath) throws IOException {
    
    
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        // 设置超时间为10秒
        conn.setConnectTimeout(10 * 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 inputStream = conn.getInputStream();
        // 获取自己数组
        byte[] getData = readInputStream(inputStream);

        // 文件保存位置
        File saveDir = new File(savePath);
        if (!saveDir.exists()) {
    
    
            saveDir.mkdir();
        }
        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if (fos != null) {
    
    
            fos.close();
        }
        if (inputStream != null) {
    
    
            inputStream.close();
        }

        System.out.println("info:" + url + " download success");

    }

    /**
     * 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) {
    
    
    	try {
    
    
			HttpDownloadFileUtil.downLoadFromUrl("https://download.oracle.com/otn/hp/oracle19c/193000/HPUX.IA64_193000_db_home.zip?AuthParam=1593347748_435a1c244eb3e65f2d7131defe0b03b7","test.zip","d:/");
		} catch (IOException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}