多线程下载图片

傷城~ 2023-10-01 21:25 21阅读 0赞

### 准备工作 ###

首先需要commons io的工具包，下载连接附上

[Commons IO – Download Apache Commons IO][Commons IO _ Download Apache Commons IO]

新建一个lib包，将下载解压之后将commons-io-2.11.0.jar复制到idea的lib包中

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_17_color_FFFFFF_t_70_g_se_x_16][]

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add as library将其添加到库中，添加之后是可展开的

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

### 实现 ###

先写一个下载器，用java.io的File类实现

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

public class TestThread2 extends Thread{
        //图片地址
        private String url;
        //文件名
        private String name;
    
        public TestThread2(String url,String name){
            this.url = url;
            this.name = name;
        }
    
        @SneakyThrows
        @Override
        public void run(){
            WebDownloader webDownloader = new WebDownloader();
            webDownloader.downloader(url,name);
            System.out.println("下载了文件名为："+name);
        }
    
        public static void main(String[] args) {
            TestThread2 t1 = new TestThread2("https://img2.baidu.com/it/u=1814268193,3619863984&fm=253&fmt=auto&app=138&f=JPEG?w=632&h=500","1.jpg");
            TestThread2 t2 = new TestThread2("https://img2.baidu.com/it/u=957523443,3301463541&fm=253&fmt=auto&app=138&f=JPEG?w=700&h=497","2.jpg");
            TestThread2 t3 = new TestThread2("https://img1.baidu.com/it/u=2306413288,4195946486&fm=253&fmt=auto&app=120&f=JPEG?w=680&h=655","3.jpg");
            t1.start();
            t2.start();
            t3.start();
        }
    }

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

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[Commons IO _ Download Apache Commons IO]: https://commons.apache.org/proper/commons-io/download_io.cgi
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_17_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/3488252eb0b64f638de050c8c37f1652.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_17,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/e925e0da09234e6ebdd3fe82c3fc7e4f.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16 1]: https://img-blog.csdnimg.cn/6ba1b9dd88fa439d8e72b5314e2534b6.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_20_color_FFFFFF_t_70_g_se_x_16 2]: https://img-blog.csdnimg.cn/eb41d2e5e4864abc8de1d4e5880c19f0.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBAY3JhenlLLg_size_11_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/800c5c3f854642308be9c5e2ef480ec5.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY3JhenlLLg==,size_11,color_FFFFFF,t_70,g_se,x_16