java url下载文件 java通过url下载文件

Java通过URL地址下载

javaUrlTest.java

package com.chenlin.util;

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

/**
 * java 从网路URL中下载文件
 *
 * @author rimi
 * @date 2019/8/21 15:51
 */
public class JavaUrlTest {
    /**
     * 从网络Url中下载文件
     * @param urlStr 网路URL地址
     * @param fileName 文件名称
     * @param savePath 文件保存路径
     * @throws IOException
     */
    public static void  downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{
        //URL url = new URL(urlStr); //出错
        URL url = new URL(null, urlStr, new sun.net.www.protocol.https.Handler());
        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");

    }



    /**
     * 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();
    }

	// 运行主函数
    public static void main(String[] args) {
        /*try{
            downLoadFromUrl("http://101.95.48.97:8005/res/upload/interface/apptutorials/manualstypeico/6f83ce8f-0da5-49b3-bac8-fd5fc67d2725.png",
                    "百度.jpg","d:/resource/images/diaodiao/country/");
        }catch (Exception e) {
            // TODO: handle exception
        }*/

        String urlStr="http://d-pic-image.yesky.com/1080x-/uploadImages/2019/044/59/1113V6L3Q6TY.jpg";
        String fileName= UUID.randomUUID().toString()+ ".jpg";
        String savePath="C:\\Users\\rimi\\Desktop\\SendEmail\\urldown\\vodel";
        try {
            downLoadFromUrl(urlStr,fileName,savePath);
        }catch (Exception e){
            System.out.println("下载失败");
            e.printStackTrace();
        }


    }




}