java下载图片(通用)httpClient,io流

谁借莪１个温暖的怀抱￠ 2023-07-25 08:50 9阅读 0赞

## httpClient下载图片 ##

public static void downImage(CloseableHttpClient client, String imgUrl, String savePath) {
            HttpGet request = new HttpGet(imgUrl);
            // 设置请求超时和传输超时
            RequestConfig requestConfig = RequestConfig.custom()
                    .setSocketTimeout(50000).setConnectTimeout(50000).build();
    
            //伪造请求头
            request.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36");
            request.setConfig(requestConfig);
    
    
         // 报错PKIX path building failed   不验证证书添加下面注释语句
         /*   try {
                SSLContext sslcontext = SSLContexts.custom().loadTrustMaterial(null, new TrustSelfSignedStrategy()).build();
                SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[]{"TLSv1"}, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
                client = HttpClients.custom().setSSLSocketFactory(sslsf).build();
            } catch (Exception e) {
                e.printStackTrace();
            }*/
    
                try {
                    CloseableHttpResponse response = client.execute(request);
                    if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
                        HttpEntity entity = response.getEntity();
                        InputStream in = entity.getContent();
                        FileUtils.copyInputStreamToFile(in, new File(savePath));
                        System.out.println("下载成功:" + imgUrl);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    throw new RuntimeException(e);
                } finally {
                    request.releaseConnection();
    
                }
            }

我们测试一下:

public static void main(String[] args) {
            CloseableHttpClient client =null;
            try {
                client =   HttpClients.createDefault();//写循环外
                downImage(client,"http://www.XXXX.com.cn/uploadfile/ftpfile/XXX.png", "E:/image/1478150765619314881279.PNG");
            } catch (Exception e) {
                e.printStackTrace();
            }finally{
                if(client!=null){
                    try {
                        client.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
    
        }

## io流下载 ##

public class ImageDownload {
        public static boolean httpDownload(String httpUrl, String saveFile) {
            // 1.下载网络文件
            int byteRead;
            URL url;
            try {
                url = new URL(httpUrl);
            } catch (MalformedURLException e1) {
                e1.printStackTrace();
                return false;
            }
    
            try {
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                //2.获取链接
                //  URLConnection conn = url.openConnection();
                if (conn.getResponseCode() == 404) {
                    System.out.println("状态码呱啦啦啦啦啦啦啦啦==" + url);
                    return false;
                }
    
                //3.输入流
                InputStream inStream = conn.getInputStream();
                //3.写入文件
    
                File file = new File(saveFile);
                if (!file.exists()) {
                    //先得到文件的上级目录，并创建上级目录，在创建文件
                    file.getParentFile().mkdir();
                    try {
                        //创建文件
                        file.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                FileOutputStream fs = new FileOutputStream(file);
    
                byte[] buffer = new byte[1024];
                while ((byteRead = inStream.read(buffer)) != -1) {
                    fs.write(buffer, 0, byteRead);
                }
    
                inStream.close();
                fs.close();
                return true;
            } catch (FileNotFoundException e) {
                System.out.println("文件找不到呱啦啦啦啦啦啦啦啦==" + url);
                e.printStackTrace();
                return false;
            } catch (IOException e) {
                System.out.println("IO呱啦啦啦啦啦啦啦啦==" + url);
                e.printStackTrace();
                return false;
            }
        }
    
    
    }

测试一下:

public static void main(String[] args) {
            ImageDownload.httpDownload("http://www.xxxxx.cn/uploadfile/ftpfile/xxxxx.png,", "E:\\image\\xxxx.PNG");
        }