直接下载 * http://softforspeed.51xiazai.cn/down/BaiduNetdisk_6.9.7.4.exe

package cn.hp.demo01;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * 直接下载
 * http://softforspeed.51xiazai.cn/down/BaiduNetdisk_6.9.7.4.exe
 */
public class Demo02 {
    public static void main(String[] args) {
        String path = "https://pm.myapp.com/invc/xfspeed/qqpcmgr/download/QQPCDownload1843.exe";
        try {
            //创建一个URL对象
            URL url = new URL(path);
            //打开连接，获取了url请求的连接对象conn
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //请求设置
            conn.setConnectTimeout(5000);//请求的超时时间
            conn.setReadTimeout(5000);//读取超时时间
            conn.setRequestMethod("GET");//设置请求提交的方法Get Post
            //获取响应码
            int responseCode = conn.getResponseCode();//获取响应码
            System.out.println("responseCode = " + responseCode);
            //如果连接ok 200
            if(responseCode==200){
                //下载？
                InputStream in = conn.getInputStream();//获取用于读取网络资源的输入流

                //下载的流
                //String fileName = conn.getHeaderField("Content-Disposition");//获取响应的头部文件（包含由文件名）
                //fileName = fileName.split(";")[1];
                //fileName = fileName.substring(fileName.indexOf("\"")+1,fileName.lastIndexOf("\""));
                //System.out.println(fileName);//成功获取文件名
                File file = new File("QQPCDownload1843.exe");
                RandomAccessFile raf = new RandomAccessFile(file,"rwd");//可读、可写，有权限

                //读一组，下载一组
                byte[]bytes=new byte[1024];
                int len = 0;
                while((len=in.read(bytes))!=-1){
                    raf.write(bytes,0,len);
                }

                //关闭流释放资源
                raf.close();
                in.close();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}