Https图片链接下载问题

1. 获取方法

入参是一个Url, 和一个随机的名称. 返回值是MultipartFile, 这里因为我这里需要调接口传到服务器, 这里也可以直接通过inputStream进行操作. 按需修改

 /**
     * 通过Url获取文件
     *
     * @param url
     * @param fileName 随机产生一个文件名, 可以是uuid等
     * @return
     * @throws Exception
     */
    public static MultipartFile doGetForHttpsUrl(String url, String fileName) throws Exception {
        CloseableHttpClient httpClient = getPassSSLCloseableHttpClient();
        InputStream inputStream = null;
        try {
            HttpGet httpGet = new HttpGet(url);
            // 第二个参数是user-agent 可以在网页的检查中看到
            httpGet.setHeader("User-Agent", getOneUserAgent());
            CloseableHttpResponse response = httpClient.execute(httpGet);
            if (response != null && response.getStatusLine().getStatusCode() == 200) {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    inputStream = entity.getContent();
                    MultipartFile multipartFile = toMultipartFile(inputStream, fileName + ".png");
                    response.close();
                    return multipartFile;
                }
            }
        } finally {
            if (httpClient != null) {
                httpClient.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        }
        return null;
    }

    /**
     * 将InputStream转换成MultipartFile
     * 这里是因为需求需要,所以转为了一下具体的根据实际情况返回需要的值
     * @param inputStream 输入流
     * @param fileName    文件名
     * @return
     */
    public static MultipartFile toMultipartFile(InputStream inputStream, String fileName) throws IOException {
        File tempFile = File.createTempFile("multipart-file", ".tmp");
        FileUtils.copyInputStreamToFile(inputStream, tempFile);
        byte[] bytes = IOUtils.toByteArray(new FileInputStream(tempFile));
        return new MockMultipartFile(tempFile.getName(), fileName, "image/jpeg", bytes);
    }

2. 信任所有的整数解决证书问题

    /**
     * 信任所有的证书
     *
     * @return
     * @throws NoSuchAlgorithmException
     * @throws KeyManagementException
     */
    private static CloseableHttpClient getPassSSLCloseableHttpClient() throws NoSuchAlgorithmException, KeyManagementException {
        // 创建信任所有证书的 TrustManager
        TrustManager[] trustAllCerts = new TrustManager[]{
                new X509TrustManager() {
                    public X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkClientTrusted(X509Certificate[] certs, String authType) {
                    }
                    public void checkServerTrusted(X509Certificate[] certs, String authType) {
                    }
                }
        };
        // 获取 SSL 上下文
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, new java.security.SecureRandom());

        // 将默认的 SSLSocketFactory 和 HostnameVerifier 替换为信任所有证书的版本
        return HttpClients.custom().setSSLContext(sc)
                .setSSLHostnameVerifier(new NoopHostnameVerifier())
                .build();
    }

获取userAgent的方法在 Https接口调用问题的最后一个title有需要的话可以看一下