教你用java提供个线上视频地址轻松抓取到本地详解编程语言

package Itxm.download;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import sun.net.www.protocol.http.HttpURLConnection;

public class Itxm{
    public static void main(String[] args) throws IOException {
        downLoadFromUrl("http://222.222.12.186:8082/picResource/doctorVideo/video/ddbai.mp4", "ddbai", "D://");
    }
    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 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");  
    }
 
    private 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 downLoadFile(String filePath,HttpServletResponse response) {
        File file = null;
        DataInputStream dis = null;
        ServletOutputStream out = null;
        try {
            file = new File(filePath);
            if (!file.exists()) {
                System.out.println("没有找到资源");
                return;
            }
            out = response.getOutputStream();
            FileInputStream fis = new FileInputStream(file);
            dis = new DataInputStream(fis);
            int len = (int) file.length();
            byte[] buffer = new byte[len];
            try {
                dis.readFully(buffer);
            } catch (IOException e) {
            } finally {
                if (dis != null) {
                    try {
                        dis.close();
                    } catch (IOException e) {
                    }
                }
            }
            try {
                out.write(buffer);
                out.flush();
            } catch (IOException e) {
            } finally {
                if (out != null) {
                    try {
                        out.close();
                    } catch (IOException e) {
                    }
                }
            }
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        }
    }
 
    public boolean deleteFile(String sPath) { 
        Boolean flag = false; 
        File file = new File(sPath); 
        // 路径为文件且不为空则进行删除 
        if (file.isFile() && file.exists()) { 
            file.delete(); 
            flag = true; 
        } 
        return flag; 
    }
}