Thread小练习(网图下载)

Posted 2022-11-27 小郑要做干饭人

本练习需要使用的jar包为commons-io,如果你的项目是Java普通的项目的话需要去下载相应的jar包,若为Maven项目可以直接导入如下依赖

			 <!--版本应该无太大差异,可忽略-->
			<dependency>
            	<groupId>commons-io</groupId>
            	<artifactId>commons-io</artifactId>
            	<version>2.11.0</version>
        	</dependency>

代码部分:

package com.zzx.线程.Thread;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

/**
 * @date: 2022/08/10/ 22:55
 * @author: ZhengZiXuan
 * @title: 练习Thread,实现一个多线程同步下载图片
 * @description:
 */
public class ThreadPractise extends Thread

    //网络图片地址
    private String url;

    //保存的文件名
    private String name;

    @Override
    public void run() 
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downLoader(url,name);
        System.out.println("下载了文件名为:"+name);
    

    public ThreadPractise(String url,String name) 
        this.name=name;
        this.url = url;
    

    public static void main(String[] args) 
        ThreadPractise t1 = new ThreadPractise("https://nimg.ws.126.net/?url=http%3A%2F%2Fdingyue.ws.126.net%2F2021%2F0731%2Fe91198a9j00qx35q30050c000j600nym.jpg&thumbnail=660x2147483647&quality=80&type=jpg","小姐姐1.jpg");
        ThreadPractise t2 = new ThreadPractise("https://nimg.ws.126.net/?url=http%3A%2F%2Fdingyue.ws.126.net%2F2020%2F0308%2Faa2f8437j00q6uv1c001fc000hs00hsm.jpg&thumbnail=660x2147483647&quality=80&type=jpg","小姐姐2.jpg");
        ThreadPractise t3 = new ThreadPractise("https://nimg.ws.126.net/?url=http%3A%2F%2Fdingyue.ws.126.net%2F2020%2F0308%2F94d8bda3j00q6uv1e000oc000hs00m7m.jpg&thumbnail=660x2147483647&quality=80&type=jpg","小姐姐3.jpg");
        //调用start方法,启动线程
        t1.start();
        t2.start();
        t3.start();

    


//下载器
class WebDownloader
    //下载方法
    public void downLoader(String pictureUrl, String name)
        try 
            FileUtils.copyURLToFile(new URL(pictureUrl),new File(name));
         catch (IOException e) 
            e.printStackTrace();
            System.err.println("IO异常,downloader方法出现问题");
        
    

经过多次运行发现,调用start方法线程是同时执行的执行效果如下:

最后声明一下:下载好的图片默认在你的当前项目目录下